2021-11-29 17:50:34 +00:00
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/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2022 Mike Teachman
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* Copyright (c) 2022 Robert Hammelrath
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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2023-10-09 02:12:18 +01:00
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// This file is never compiled standalone, it's included directly from
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// extmod/machine_i2s.c via MICROPY_PY_MACHINE_I2S_INCLUDEFILE.
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2021-11-29 17:50:34 +00:00
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#include "py/mphal.h"
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#include "dma_manager.h"
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2022-01-01 13:00:37 +00:00
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#include CLOCK_CONFIG_H
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2021-11-29 17:50:34 +00:00
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#include "fsl_iomuxc.h"
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#include "fsl_dmamux.h"
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#include "fsl_edma.h"
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#include "fsl_sai.h"
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#if MICROPY_PY_MACHINE_I2S
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// The I2S module has 3 modes of operation:
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//
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// Mode1: Blocking
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// - readinto() and write() methods block until the supplied buffer is filled (read) or emptied (write)
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// - this is the default mode of operation
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//
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// Mode2: Non-Blocking
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// - readinto() and write() methods return immediately
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// - buffer filling and emptying happens asynchronously to the main MicroPython task
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// - a callback function is called when the supplied buffer has been filled (read) or emptied (write)
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// - non-blocking mode is enabled when a callback is set with the irq() method
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// - the DMA callback is used to implement the asynchronous background operations
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//
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// Mode3: Asyncio
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// - implements the stream protocol
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// - asyncio mode is enabled when the ioctl() function is called
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// - the state of the internal ring buffer is used to detect that I2S samples can be read or written
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//
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// The samples contained in the app buffer supplied for the readinto() and write() methods have the following convention:
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// Mono: little endian format
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// Stereo: little endian format, left channel first
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//
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// I2S terms:
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// "frame": consists of two audio samples (Left audio sample + Right audio sample)
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//
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// Misc:
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// - for Mono configuration:
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// - readinto method: samples are gathered from the L channel only
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// - write method: every sample is output to both the L and R channels
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// - for readinto method the I2S hardware is read using 8-byte frames
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// (this is standard for almost all I2S hardware, such as MEMS microphones)
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// - all 3 Modes of operation are implemented using the peripheral drivers in the NXP MCUXpresso SDK
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// - all sample data transfers use DMA
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// - the DMA ping-pong buffer needs to be aligned to a cache line size of 32 bytes. 32 byte
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// alignment is needed to use the routines that clean and invalidate D-Cache which work on a
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// 32 byte address boundary.
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// - master clock frequency is sampling frequency * 256
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// DMA ping-pong buffer size was empirically determined. It is a tradeoff between:
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// 1. memory use (smaller buffer size desirable to reduce memory footprint)
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// 2. interrupt frequency (larger buffer size desirable to reduce interrupt frequency)
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// The sizeof 1/2 of the DMA buffer must be evenly divisible by the cache line size of 32 bytes.
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#define SIZEOF_DMA_BUFFER_IN_BYTES (256)
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#define SIZEOF_HALF_DMA_BUFFER_IN_BYTES (SIZEOF_DMA_BUFFER_IN_BYTES / 2)
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// For non-blocking mode, to avoid underflow/overflow, sample data is written/read to/from the ring buffer at a rate faster
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// than the DMA transfer rate
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#define NON_BLOCKING_RATE_MULTIPLIER (4)
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#define SIZEOF_NON_BLOCKING_COPY_IN_BYTES (SIZEOF_HALF_DMA_BUFFER_IN_BYTES * NON_BLOCKING_RATE_MULTIPLIER)
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#define NUM_I2S_USER_FORMATS (4)
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#define I2S_RX_FRAME_SIZE_IN_BYTES (8)
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#define SAI_CHANNEL_0 (0)
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#define SAI_NUM_AUDIO_CHANNELS (2U)
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typedef enum {
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SCK,
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WS,
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SD,
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MCK
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} i2s_pin_function_t;
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typedef enum {
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RX,
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TX,
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} i2s_mode_t;
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typedef enum {
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MONO,
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STEREO
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} format_t;
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typedef enum {
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BLOCKING,
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NON_BLOCKING,
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ASYNCIO
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} io_mode_t;
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typedef enum {
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TOP_HALF,
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BOTTOM_HALF
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} ping_pong_t;
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typedef struct _machine_i2s_obj_t {
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mp_obj_base_t base;
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uint8_t i2s_id;
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mp_hal_pin_obj_t sck;
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mp_hal_pin_obj_t ws;
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mp_hal_pin_obj_t sd;
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mp_hal_pin_obj_t mck;
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i2s_mode_t mode;
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int8_t bits;
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format_t format;
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int32_t rate;
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int32_t ibuf;
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mp_obj_t callback_for_non_blocking;
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uint8_t dma_buffer[SIZEOF_DMA_BUFFER_IN_BYTES + 0x1f]; // 0x1f related to D-Cache alignment
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uint8_t *dma_buffer_dcache_aligned;
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ring_buf_t ring_buffer;
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uint8_t *ring_buffer_storage;
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non_blocking_descriptor_t non_blocking_descriptor;
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io_mode_t io_mode;
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I2S_Type *i2s_inst;
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int dma_channel;
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edma_handle_t edmaHandle;
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edma_tcd_t *edmaTcd;
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} machine_i2s_obj_t;
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typedef struct _iomux_table_t {
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uint32_t muxRegister;
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uint32_t muxMode;
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uint32_t inputRegister;
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uint32_t inputDaisy;
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uint32_t configRegister;
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} iomux_table_t;
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typedef struct _gpio_map_t {
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uint8_t hw_id;
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i2s_pin_function_t fn;
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i2s_mode_t mode;
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qstr name;
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iomux_table_t iomux;
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} gpio_map_t;
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typedef struct _i2s_clock_config_t {
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sai_sample_rate_t rate;
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const clock_audio_pll_config_t *pll_config;
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uint32_t clock_pre_divider;
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uint32_t clock_divider;
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} i2s_clock_config_t;
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STATIC mp_obj_t machine_i2s_deinit(mp_obj_t self_in);
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// The frame map is used with the readinto() method to transform the audio sample data coming
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// from DMA memory (32-bit stereo) to the format specified
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// in the I2S constructor. e.g. 16-bit mono
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STATIC const int8_t i2s_frame_map[NUM_I2S_USER_FORMATS][I2S_RX_FRAME_SIZE_IN_BYTES] = {
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{-1, -1, 0, 1, -1, -1, -1, -1 }, // Mono, 16-bits
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{ 0, 1, 2, 3, -1, -1, -1, -1 }, // Mono, 32-bits
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{-1, -1, 0, 1, -1, -1, 2, 3 }, // Stereo, 16-bits
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{ 0, 1, 2, 3, 4, 5, 6, 7 }, // Stereo, 32-bits
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};
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// 2 PLL configurations
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// PLL output frequency = 24MHz * (.loopDivider + .numerator/.denominator)
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// Configuration 1: for sampling frequencies [Hz]: 8000, 12000, 16000, 24000, 32000, 48000
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2021-10-20 20:24:20 +01:00
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// Clock frequency = 786,432,000 Hz = 48000 * 64 * 256
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STATIC const clock_audio_pll_config_t audioPllConfig_8000_48000 = {
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.loopDivider = 32, // PLL loop divider. Valid range for DIV_SELECT divider value: 27~54
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.postDivider = 1, // Divider after the PLL, should only be 1, 2, 4, 8, 16
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2021-10-20 20:24:20 +01:00
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.numerator = 76800, // 30 bit numerator of fractional loop divider
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.denominator = 100000, // 30 bit denominator of fractional loop divider
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2021-10-20 20:24:20 +01:00
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#if !defined(MIMXRT117x_SERIES)
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.src = kCLOCK_PllClkSrc24M // Pll clock source
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#endif
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};
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// Configuration 2: for sampling frequencies [Hz]: 11025, 22050, 44100
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// Clock frequency = 722,534,400 = 44100 * 64 * 256
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STATIC const clock_audio_pll_config_t audioPllConfig_11025_44100 = {
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.loopDivider = 30, // PLL loop divider. Valid range for DIV_SELECT divider value: 27~54
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.postDivider = 1, // Divider after the PLL, should only be 1, 2, 4, 8, 16
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.numerator = 10560, // 30 bit numerator of fractional loop divider
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.denominator = 100000, // 30 bit denominator of fractional loop divider
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#if !defined(MIMXRT117x_SERIES)
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.src = kCLOCK_PllClkSrc24M // Pll clock source
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#endif
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};
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2021-10-20 20:24:20 +01:00
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#if defined(MIMXRT117x_SERIES)
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// for 1176 the pre_div value is used for post_div of the Audio PLL,
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// which is 2**n: 0->1, 1->2, 2->4, 3->8, 4->16, 5->32
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// The divider is 8 bit and must be given as n (not n-1)
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// So the total division factor is given by (2**p) * d
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STATIC const i2s_clock_config_t clock_config_map[] = {
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{kSAI_SampleRate8KHz, &audioPllConfig_8000_48000, 1, 192}, // 384
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{kSAI_SampleRate11025Hz, &audioPllConfig_11025_44100, 1, 128}, // 256
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{kSAI_SampleRate12KHz, &audioPllConfig_8000_48000, 1, 128}, // 256
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{kSAI_SampleRate16KHz, &audioPllConfig_8000_48000, 0, 192}, // 192
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{kSAI_SampleRate22050Hz, &audioPllConfig_11025_44100, 0, 128}, // 128
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{kSAI_SampleRate24KHz, &audioPllConfig_8000_48000, 0, 128}, // 128
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{kSAI_SampleRate32KHz, &audioPllConfig_8000_48000, 0, 96}, // 96
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{kSAI_SampleRate44100Hz, &audioPllConfig_11025_44100, 0, 64}, // 64
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{kSAI_SampleRate48KHz, &audioPllConfig_8000_48000, 0, 64} // 64
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};
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STATIC const clock_root_t i2s_clock_mux[] = I2S_CLOCK_MUX;
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#else
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// for 10xx the total division factor is given by (p + 1) * (d + 1)
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STATIC const i2s_clock_config_t clock_config_map[] = {
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{kSAI_SampleRate8KHz, &audioPllConfig_8000_48000, 5, 63}, // 384
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{kSAI_SampleRate11025Hz, &audioPllConfig_11025_44100, 3, 63}, // 256
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{kSAI_SampleRate12KHz, &audioPllConfig_8000_48000, 3, 63}, // 256
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{kSAI_SampleRate16KHz, &audioPllConfig_8000_48000, 2, 63}, // 192
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{kSAI_SampleRate22050Hz, &audioPllConfig_11025_44100, 1, 63}, // 128
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{kSAI_SampleRate24KHz, &audioPllConfig_8000_48000, 1, 63}, // 128
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{kSAI_SampleRate32KHz, &audioPllConfig_8000_48000, 1, 47}, // 96
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{kSAI_SampleRate44100Hz, &audioPllConfig_11025_44100, 0, 63}, // 64
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{kSAI_SampleRate48KHz, &audioPllConfig_8000_48000, 0, 63} // 64
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};
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STATIC const clock_mux_t i2s_clock_mux[] = I2S_CLOCK_MUX;
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STATIC const clock_div_t i2s_clock_pre_div[] = I2S_CLOCK_PRE_DIV;
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STATIC const clock_div_t i2s_clock_div[] = I2S_CLOCK_DIV;
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STATIC const iomuxc_gpr_mode_t i2s_iomuxc_gpr_mode[] = I2S_IOMUXC_GPR_MODE;
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#endif
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STATIC const I2S_Type *i2s_base_ptr[] = I2S_BASE_PTRS;
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STATIC const dma_request_source_t i2s_dma_req_src_tx[] = I2S_DMA_REQ_SRC_TX;
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STATIC const dma_request_source_t i2s_dma_req_src_rx[] = I2S_DMA_REQ_SRC_RX;
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STATIC const gpio_map_t i2s_gpio_map[] = I2S_GPIO_MAP;
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AT_NONCACHEABLE_SECTION_ALIGN(STATIC edma_tcd_t edmaTcd[MICROPY_HW_I2S_NUM], 32);
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// called on processor reset
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void machine_i2s_init0() {
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for (uint8_t i = 0; i < MICROPY_HW_I2S_NUM; i++) {
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MP_STATE_PORT(machine_i2s_obj)[i] = NULL;
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}
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}
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// called on soft reboot
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void machine_i2s_deinit_all(void) {
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for (uint8_t i = 0; i < MICROPY_HW_I2S_NUM; i++) {
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machine_i2s_obj_t *i2s_obj = MP_STATE_PORT(machine_i2s_obj)[i];
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if (i2s_obj != NULL) {
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machine_i2s_deinit(i2s_obj);
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MP_STATE_PORT(machine_i2s_obj)[i] = NULL;
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}
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}
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}
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STATIC int8_t get_frame_mapping_index(int8_t bits, format_t format) {
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if (format == MONO) {
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if (bits == 16) {
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return 0;
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} else { // 32 bits
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return 1;
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}
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} else { // STEREO
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if (bits == 16) {
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return 2;
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} else { // 32 bits
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return 3;
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}
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}
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}
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STATIC int8_t get_dma_bits(uint16_t mode, int8_t bits) {
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if (mode == TX) {
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if (bits == 16) {
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return 16;
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} else {
|
|
|
|
return 32;
|
|
|
|
}
|
|
|
|
return bits;
|
|
|
|
} else { // RX
|
|
|
|
// always read 32 bit words for I2S e.g. I2S MEMS microphones
|
|
|
|
return 32;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC bool lookup_gpio(const machine_pin_obj_t *pin, i2s_pin_function_t fn, uint8_t hw_id, uint16_t *index) {
|
|
|
|
for (uint16_t i = 0; i < ARRAY_SIZE(i2s_gpio_map); i++) {
|
|
|
|
if ((pin->name == i2s_gpio_map[i].name) &&
|
|
|
|
(i2s_gpio_map[i].fn == fn) &&
|
|
|
|
(i2s_gpio_map[i].hw_id == hw_id)) {
|
|
|
|
*index = i;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC bool set_iomux(const machine_pin_obj_t *pin, i2s_pin_function_t fn, uint8_t hw_id) {
|
|
|
|
uint16_t mapping_index;
|
|
|
|
if (lookup_gpio(pin, fn, hw_id, &mapping_index)) {
|
|
|
|
iomux_table_t iom = i2s_gpio_map[mapping_index].iomux;
|
|
|
|
IOMUXC_SetPinMux(iom.muxRegister, iom.muxMode, iom.inputRegister, iom.inputDaisy, iom.configRegister, 1U);
|
|
|
|
IOMUXC_SetPinConfig(iom.muxRegister, iom.muxMode, iom.inputRegister, iom.inputDaisy, iom.configRegister,
|
|
|
|
pin_generate_config(PIN_PULL_DISABLED, PIN_MODE_OUT, 2, iom.configRegister));
|
|
|
|
return true;
|
|
|
|
} else {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC bool is_rate_supported(int32_t rate) {
|
|
|
|
for (uint16_t i = 0; i < ARRAY_SIZE(clock_config_map); i++) {
|
|
|
|
if (clock_config_map[i].rate == rate) {
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC const clock_audio_pll_config_t *get_pll_config(int32_t rate) {
|
|
|
|
for (uint16_t i = 0; i < ARRAY_SIZE(clock_config_map); i++) {
|
|
|
|
if (clock_config_map[i].rate == rate) {
|
|
|
|
return clock_config_map[i].pll_config;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC const uint32_t get_clock_pre_divider(int32_t rate) {
|
|
|
|
for (uint16_t i = 0; i < ARRAY_SIZE(clock_config_map); i++) {
|
|
|
|
if (clock_config_map[i].rate == rate) {
|
|
|
|
return clock_config_map[i].clock_pre_divider;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC const uint32_t get_clock_divider(int32_t rate) {
|
|
|
|
for (uint16_t i = 0; i < ARRAY_SIZE(clock_config_map); i++) {
|
|
|
|
if (clock_config_map[i].rate == rate) {
|
|
|
|
return clock_config_map[i].clock_divider;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
// function is used in IRQ context
|
|
|
|
STATIC void empty_dma(machine_i2s_obj_t *self, ping_pong_t dma_ping_pong) {
|
|
|
|
uint16_t dma_buffer_offset = 0;
|
|
|
|
|
|
|
|
if (dma_ping_pong == TOP_HALF) {
|
|
|
|
dma_buffer_offset = 0;
|
|
|
|
} else { // BOTTOM_HALF
|
|
|
|
dma_buffer_offset = SIZEOF_HALF_DMA_BUFFER_IN_BYTES;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t *dma_buffer_p = &self->dma_buffer_dcache_aligned[dma_buffer_offset];
|
|
|
|
|
|
|
|
// flush and invalidate cache so the CPU reads data placed into RAM by DMA
|
|
|
|
MP_HAL_CLEANINVALIDATE_DCACHE(dma_buffer_p, SIZEOF_HALF_DMA_BUFFER_IN_BYTES);
|
|
|
|
|
|
|
|
// when space exists, copy samples into ring buffer
|
|
|
|
if (ringbuf_available_space(&self->ring_buffer) >= SIZEOF_HALF_DMA_BUFFER_IN_BYTES) {
|
|
|
|
for (uint32_t i = 0; i < SIZEOF_HALF_DMA_BUFFER_IN_BYTES; i++) {
|
|
|
|
ringbuf_push(&self->ring_buffer, dma_buffer_p[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// function is used in IRQ context
|
|
|
|
STATIC void feed_dma(machine_i2s_obj_t *self, ping_pong_t dma_ping_pong) {
|
|
|
|
uint16_t dma_buffer_offset = 0;
|
|
|
|
|
|
|
|
if (dma_ping_pong == TOP_HALF) {
|
|
|
|
dma_buffer_offset = 0;
|
|
|
|
} else { // BOTTOM_HALF
|
|
|
|
dma_buffer_offset = SIZEOF_HALF_DMA_BUFFER_IN_BYTES;
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t *dma_buffer_p = &self->dma_buffer_dcache_aligned[dma_buffer_offset];
|
|
|
|
|
|
|
|
// when data exists, copy samples from ring buffer
|
|
|
|
if (ringbuf_available_data(&self->ring_buffer) >= SIZEOF_HALF_DMA_BUFFER_IN_BYTES) {
|
|
|
|
|
|
|
|
// copy a block of samples from the ring buffer to the dma buffer.
|
|
|
|
// mono format is implemented by duplicating each sample into both L and R channels.
|
|
|
|
if ((self->format == MONO) && (self->bits == 16)) {
|
|
|
|
for (uint32_t i = 0; i < SIZEOF_HALF_DMA_BUFFER_IN_BYTES / 4; i++) {
|
|
|
|
for (uint8_t b = 0; b < sizeof(uint16_t); b++) {
|
|
|
|
ringbuf_pop(&self->ring_buffer, &dma_buffer_p[i * 4 + b]);
|
|
|
|
dma_buffer_p[i * 4 + b + 2] = dma_buffer_p[i * 4 + b]; // duplicated mono sample
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else if ((self->format == MONO) && (self->bits == 32)) {
|
|
|
|
for (uint32_t i = 0; i < SIZEOF_HALF_DMA_BUFFER_IN_BYTES / 8; i++) {
|
|
|
|
for (uint8_t b = 0; b < sizeof(uint32_t); b++) {
|
|
|
|
ringbuf_pop(&self->ring_buffer, &dma_buffer_p[i * 8 + b]);
|
|
|
|
dma_buffer_p[i * 8 + b + 4] = dma_buffer_p[i * 8 + b]; // duplicated mono sample
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else { // STEREO, both 16-bit and 32-bit
|
|
|
|
for (uint32_t i = 0; i < SIZEOF_HALF_DMA_BUFFER_IN_BYTES; i++) {
|
|
|
|
ringbuf_pop(&self->ring_buffer, &dma_buffer_p[i]);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
// underflow. clear buffer to transmit "silence" on the I2S bus
|
|
|
|
memset(dma_buffer_p, 0, SIZEOF_HALF_DMA_BUFFER_IN_BYTES);
|
|
|
|
}
|
|
|
|
|
|
|
|
// flush cache to RAM so DMA can read the sample data
|
|
|
|
MP_HAL_CLEAN_DCACHE(dma_buffer_p, SIZEOF_HALF_DMA_BUFFER_IN_BYTES);
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC void edma_i2s_callback(edma_handle_t *handle, void *userData, bool transferDone, uint32_t tcds) {
|
|
|
|
machine_i2s_obj_t *self = userData;
|
|
|
|
|
|
|
|
if (self->mode == TX) {
|
|
|
|
// for non-blocking mode, sample copying (appbuf->ibuf) is initiated in this callback routine
|
|
|
|
if ((self->io_mode == NON_BLOCKING) && (self->non_blocking_descriptor.copy_in_progress)) {
|
|
|
|
copy_appbuf_to_ringbuf_non_blocking(self);
|
|
|
|
}
|
|
|
|
|
|
|
|
if (transferDone) {
|
|
|
|
// bottom half of buffer now emptied,
|
|
|
|
// safe to fill the bottom half while the top half of buffer is being emptied
|
|
|
|
feed_dma(self, BOTTOM_HALF);
|
|
|
|
} else {
|
|
|
|
// top half of buffer now emptied,
|
|
|
|
// safe to fill the top half while the bottom half of buffer is being emptied
|
|
|
|
feed_dma(self, TOP_HALF);
|
|
|
|
}
|
|
|
|
} else { // RX
|
|
|
|
if (transferDone) {
|
|
|
|
// bottom half of buffer now filled,
|
|
|
|
// safe to empty the bottom half while the top half of buffer is being filled
|
|
|
|
empty_dma(self, BOTTOM_HALF);
|
|
|
|
} else {
|
|
|
|
// top half of buffer now filled,
|
|
|
|
// safe to empty the top half while the bottom half of buffer is being filled
|
|
|
|
empty_dma(self, TOP_HALF);
|
|
|
|
}
|
|
|
|
|
|
|
|
// for non-blocking mode, sample copying (ibuf->appbuf) is initiated in this callback routine
|
|
|
|
if ((self->io_mode == NON_BLOCKING) && (self->non_blocking_descriptor.copy_in_progress)) {
|
|
|
|
fill_appbuf_from_ringbuf_non_blocking(self);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC bool i2s_init(machine_i2s_obj_t *self) {
|
|
|
|
|
2021-10-20 20:24:20 +01:00
|
|
|
#if defined(MIMXRT117x_SERIES)
|
|
|
|
clock_audio_pll_config_t pll_config = *get_pll_config(self->rate);
|
|
|
|
pll_config.postDivider = get_clock_pre_divider(self->rate);
|
|
|
|
CLOCK_InitAudioPll(&pll_config);
|
|
|
|
CLOCK_SetRootClockMux(i2s_clock_mux[self->i2s_id], I2S_AUDIO_PLL_CLOCK);
|
|
|
|
CLOCK_SetRootClockDiv(i2s_clock_mux[self->i2s_id], get_clock_divider(self->rate));
|
|
|
|
uint32_t clock_freq = CLOCK_GetFreq(kCLOCK_AudioPllOut) / get_clock_divider(self->rate);
|
|
|
|
|
|
|
|
#else
|
|
|
|
|
2021-11-29 17:50:34 +00:00
|
|
|
CLOCK_InitAudioPll(get_pll_config(self->rate));
|
2021-10-20 20:24:20 +01:00
|
|
|
CLOCK_SetMux(i2s_clock_mux[self->i2s_id], I2S_AUDIO_PLL_CLOCK);
|
2021-11-29 17:50:34 +00:00
|
|
|
CLOCK_SetDiv(i2s_clock_pre_div[self->i2s_id], get_clock_pre_divider(self->rate));
|
|
|
|
CLOCK_SetDiv(i2s_clock_div[self->i2s_id], get_clock_divider(self->rate));
|
2021-10-20 20:24:20 +01:00
|
|
|
uint32_t clock_freq =
|
|
|
|
(CLOCK_GetFreq(kCLOCK_AudioPllClk) / (get_clock_divider(self->rate) + 1U) /
|
|
|
|
(get_clock_pre_divider(self->rate) + 1U));
|
|
|
|
#endif
|
2021-11-29 17:50:34 +00:00
|
|
|
|
|
|
|
if (!set_iomux(self->sck, SCK, self->i2s_id)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!set_iomux(self->ws, WS, self->i2s_id)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!set_iomux(self->sd, SD, self->i2s_id)) {
|
|
|
|
return false;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (self->mck) {
|
|
|
|
if (!set_iomux(self->mck, MCK, self->i2s_id)) {
|
|
|
|
return false;
|
|
|
|
}
|
2021-10-20 20:24:20 +01:00
|
|
|
#if defined(MIMXRT117x_SERIES)
|
|
|
|
switch (self->i2s_id) {
|
|
|
|
case 1:
|
|
|
|
IOMUXC_GPR->GPR0 |= IOMUXC_GPR_GPR0_SAI1_MCLK_DIR_MASK;
|
|
|
|
break;
|
|
|
|
case 2:
|
|
|
|
IOMUXC_GPR->GPR1 |= IOMUXC_GPR_GPR1_SAI2_MCLK_DIR_MASK;
|
|
|
|
break;
|
|
|
|
case 3:
|
|
|
|
IOMUXC_GPR->GPR2 |= IOMUXC_GPR_GPR2_SAI3_MCLK_DIR_MASK;
|
|
|
|
break;
|
|
|
|
case 4:
|
|
|
|
IOMUXC_GPR->GPR2 |= IOMUXC_GPR_GPR2_SAI4_MCLK_DIR_MASK;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
#else
|
2021-11-29 17:50:34 +00:00
|
|
|
IOMUXC_EnableMode(IOMUXC_GPR, i2s_iomuxc_gpr_mode[self->i2s_id], true);
|
2021-10-20 20:24:20 +01:00
|
|
|
#endif
|
2021-11-29 17:50:34 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
self->dma_channel = allocate_dma_channel();
|
|
|
|
|
|
|
|
DMAMUX_Init(DMAMUX);
|
|
|
|
if (self->mode == TX) {
|
|
|
|
DMAMUX_SetSource(DMAMUX, self->dma_channel, i2s_dma_req_src_tx[self->i2s_id]);
|
|
|
|
} else { // RX
|
|
|
|
DMAMUX_SetSource(DMAMUX, self->dma_channel, i2s_dma_req_src_rx[self->i2s_id]);
|
|
|
|
}
|
|
|
|
DMAMUX_EnableChannel(DMAMUX, self->dma_channel);
|
|
|
|
|
|
|
|
dma_init();
|
|
|
|
EDMA_CreateHandle(&self->edmaHandle, DMA0, self->dma_channel);
|
|
|
|
EDMA_SetCallback(&self->edmaHandle, edma_i2s_callback, self);
|
|
|
|
EDMA_ResetChannel(DMA0, self->dma_channel);
|
|
|
|
|
|
|
|
SAI_Init(self->i2s_inst);
|
|
|
|
|
|
|
|
sai_transceiver_t saiConfig;
|
|
|
|
SAI_GetClassicI2SConfig(&saiConfig, get_dma_bits(self->mode, self->bits), kSAI_Stereo, kSAI_Channel0Mask);
|
|
|
|
saiConfig.masterSlave = kSAI_Master;
|
|
|
|
|
|
|
|
uint16_t sck_index;
|
|
|
|
lookup_gpio(self->sck, SCK, self->i2s_id, &sck_index);
|
|
|
|
|
|
|
|
if ((self->mode == TX) && (i2s_gpio_map[sck_index].mode == TX)) {
|
|
|
|
saiConfig.syncMode = kSAI_ModeAsync;
|
|
|
|
SAI_TxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
} else if ((self->mode == RX) && (i2s_gpio_map[sck_index].mode == RX)) {
|
|
|
|
saiConfig.syncMode = kSAI_ModeAsync;
|
|
|
|
SAI_RxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
} else if ((self->mode == TX) && (i2s_gpio_map[sck_index].mode == RX)) {
|
|
|
|
saiConfig.syncMode = kSAI_ModeAsync;
|
|
|
|
SAI_RxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
saiConfig.bitClock.bclkSrcSwap = true;
|
|
|
|
saiConfig.syncMode = kSAI_ModeSync;
|
|
|
|
SAI_TxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
} else if ((self->mode == RX) && (i2s_gpio_map[sck_index].mode == TX)) {
|
|
|
|
saiConfig.syncMode = kSAI_ModeAsync;
|
|
|
|
SAI_TxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
saiConfig.syncMode = kSAI_ModeSync;
|
|
|
|
SAI_RxSetConfig(self->i2s_inst, &saiConfig);
|
|
|
|
} else {
|
|
|
|
return false; // should never happen
|
|
|
|
}
|
|
|
|
|
|
|
|
SAI_TxSetBitClockRate(self->i2s_inst, clock_freq, self->rate, get_dma_bits(self->mode, self->bits),
|
|
|
|
SAI_NUM_AUDIO_CHANNELS);
|
|
|
|
SAI_RxSetBitClockRate(self->i2s_inst, clock_freq, self->rate, get_dma_bits(self->mode, self->bits),
|
|
|
|
SAI_NUM_AUDIO_CHANNELS);
|
|
|
|
|
|
|
|
edma_transfer_config_t transferConfig;
|
|
|
|
uint8_t bytes_per_sample = get_dma_bits(self->mode, self->bits) / 8;
|
|
|
|
|
|
|
|
if (self->mode == TX) {
|
|
|
|
uint32_t destAddr = SAI_TxGetDataRegisterAddress(self->i2s_inst, SAI_CHANNEL_0);
|
|
|
|
EDMA_PrepareTransfer(&transferConfig,
|
|
|
|
self->dma_buffer_dcache_aligned, bytes_per_sample,
|
|
|
|
(void *)destAddr, bytes_per_sample,
|
|
|
|
(FSL_FEATURE_SAI_FIFO_COUNT - saiConfig.fifo.fifoWatermark) * bytes_per_sample,
|
|
|
|
SIZEOF_DMA_BUFFER_IN_BYTES, kEDMA_MemoryToPeripheral);
|
|
|
|
} else { // RX
|
|
|
|
uint32_t srcAddr = SAI_RxGetDataRegisterAddress(self->i2s_inst, SAI_CHANNEL_0);
|
|
|
|
EDMA_PrepareTransfer(&transferConfig,
|
|
|
|
(void *)srcAddr, bytes_per_sample,
|
|
|
|
self->dma_buffer_dcache_aligned, bytes_per_sample,
|
|
|
|
(FSL_FEATURE_SAI_FIFO_COUNT - saiConfig.fifo.fifoWatermark) * bytes_per_sample,
|
|
|
|
SIZEOF_DMA_BUFFER_IN_BYTES, kEDMA_PeripheralToMemory);
|
|
|
|
}
|
|
|
|
|
|
|
|
memset(self->edmaTcd, 0, sizeof(edma_tcd_t));
|
|
|
|
|
|
|
|
// continuous DMA operation is achieved using the scatter/gather feature, with one TCD linked back to itself
|
|
|
|
EDMA_TcdSetTransferConfig(self->edmaTcd, &transferConfig, self->edmaTcd);
|
|
|
|
EDMA_TcdEnableInterrupts(self->edmaTcd, kEDMA_MajorInterruptEnable | kEDMA_HalfInterruptEnable);
|
|
|
|
EDMA_InstallTCD(DMA0, self->dma_channel, self->edmaTcd);
|
|
|
|
EDMA_StartTransfer(&self->edmaHandle);
|
|
|
|
|
|
|
|
if (self->mode == TX) {
|
|
|
|
SAI_TxEnableDMA(self->i2s_inst, kSAI_FIFORequestDMAEnable, true);
|
|
|
|
SAI_TxEnable(self->i2s_inst, true);
|
|
|
|
SAI_TxSetChannelFIFOMask(self->i2s_inst, kSAI_Channel0Mask);
|
|
|
|
} else { // RX
|
|
|
|
SAI_RxEnableDMA(self->i2s_inst, kSAI_FIFORequestDMAEnable, true);
|
|
|
|
SAI_RxEnable(self->i2s_inst, true);
|
|
|
|
SAI_RxSetChannelFIFOMask(self->i2s_inst, kSAI_Channel0Mask);
|
|
|
|
}
|
|
|
|
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
|
2023-10-09 02:12:18 +01:00
|
|
|
STATIC void mp_machine_i2s_init_helper(machine_i2s_obj_t *self, size_t n_pos_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
|
2021-11-29 17:50:34 +00:00
|
|
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|
|
|
|
enum {
|
|
|
|
ARG_sck,
|
|
|
|
ARG_ws,
|
|
|
|
ARG_sd,
|
|
|
|
ARG_mck,
|
|
|
|
ARG_mode,
|
|
|
|
ARG_bits,
|
|
|
|
ARG_format,
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|
|
ARG_rate,
|
|
|
|
ARG_ibuf,
|
|
|
|
};
|
|
|
|
|
|
|
|
static const mp_arg_t allowed_args[] = {
|
|
|
|
{ MP_QSTR_sck, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
|
|
|
{ MP_QSTR_ws, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
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|
|
{ MP_QSTR_sd, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
|
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|
|
{ MP_QSTR_mck, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = mp_const_none} },
|
|
|
|
{ MP_QSTR_mode, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
|
|
|
|
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
|
|
|
|
{ MP_QSTR_format, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
|
|
|
|
{ MP_QSTR_rate, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
|
|
|
|
{ MP_QSTR_ibuf, MP_ARG_KW_ONLY | MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = -1} },
|
|
|
|
};
|
|
|
|
|
|
|
|
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
|
|
|
|
mp_arg_parse_all(n_pos_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
|
|
|
|
|
|
|
|
//
|
|
|
|
// ---- Check validity of arguments ----
|
|
|
|
//
|
|
|
|
|
|
|
|
// is Mode valid?
|
|
|
|
uint16_t i2s_mode = args[ARG_mode].u_int;
|
|
|
|
if ((i2s_mode != (RX)) &&
|
|
|
|
(i2s_mode != (TX))) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid mode"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// are I2S pin assignments valid?
|
|
|
|
uint16_t not_used;
|
|
|
|
|
|
|
|
// is SCK valid?
|
|
|
|
const machine_pin_obj_t *pin_sck = pin_find(args[ARG_sck].u_obj);
|
|
|
|
if (!lookup_gpio(pin_sck, SCK, self->i2s_id, ¬_used)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid SCK pin"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is WS valid?
|
|
|
|
const machine_pin_obj_t *pin_ws = pin_find(args[ARG_ws].u_obj);
|
|
|
|
if (!lookup_gpio(pin_ws, WS, self->i2s_id, ¬_used)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid WS pin"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is SD valid?
|
|
|
|
const machine_pin_obj_t *pin_sd = pin_find(args[ARG_sd].u_obj);
|
|
|
|
uint16_t mapping_index;
|
|
|
|
bool invalid_sd = true;
|
|
|
|
if (lookup_gpio(pin_sd, SD, self->i2s_id, &mapping_index)) {
|
|
|
|
if (i2s_mode == i2s_gpio_map[mapping_index].mode) {
|
|
|
|
invalid_sd = false;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
if (invalid_sd) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid SD pin"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is MCK defined and valid?
|
|
|
|
const machine_pin_obj_t *pin_mck = NULL;
|
|
|
|
if (args[ARG_mck].u_obj != mp_const_none) {
|
|
|
|
pin_mck = pin_find(args[ARG_mck].u_obj);
|
|
|
|
if (!lookup_gpio(pin_mck, MCK, self->i2s_id, ¬_used)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid MCK pin"));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// is Bits valid?
|
|
|
|
int8_t i2s_bits = args[ARG_bits].u_int;
|
|
|
|
if ((i2s_bits != 16) &&
|
|
|
|
(i2s_bits != 32)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid bits"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is Format valid?
|
|
|
|
format_t i2s_format = args[ARG_format].u_int;
|
|
|
|
if ((i2s_format != MONO) &&
|
|
|
|
(i2s_format != STEREO)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid format"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is Rate valid?
|
|
|
|
int32_t i2s_rate = args[ARG_rate].u_int;
|
|
|
|
if (!is_rate_supported(i2s_rate)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid rate"));
|
|
|
|
}
|
|
|
|
|
|
|
|
// is Ibuf valid?
|
|
|
|
int32_t ring_buffer_len = args[ARG_ibuf].u_int;
|
|
|
|
if (ring_buffer_len > 0) {
|
|
|
|
uint8_t *buffer = m_new(uint8_t, ring_buffer_len);
|
|
|
|
self->ring_buffer_storage = buffer;
|
|
|
|
ringbuf_init(&self->ring_buffer, buffer, ring_buffer_len);
|
|
|
|
} else {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid ibuf"));
|
|
|
|
}
|
|
|
|
|
|
|
|
self->sck = pin_sck;
|
|
|
|
self->ws = pin_ws;
|
|
|
|
self->sd = pin_sd;
|
|
|
|
self->mck = pin_mck;
|
|
|
|
self->mode = i2s_mode;
|
|
|
|
self->bits = i2s_bits;
|
|
|
|
self->format = i2s_format;
|
|
|
|
self->rate = i2s_rate;
|
|
|
|
self->ibuf = ring_buffer_len;
|
|
|
|
self->callback_for_non_blocking = MP_OBJ_NULL;
|
|
|
|
self->non_blocking_descriptor.copy_in_progress = false;
|
|
|
|
self->io_mode = BLOCKING;
|
|
|
|
self->i2s_inst = (I2S_Type *)i2s_base_ptr[self->i2s_id];
|
|
|
|
|
|
|
|
// init the I2S bus
|
|
|
|
if (!i2s_init(self)) {
|
|
|
|
mp_raise_msg_varg(&mp_type_OSError, MP_ERROR_TEXT("I2S init failed"));
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC void machine_i2s_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
|
|
|
|
machine_i2s_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
|
|
mp_printf(print, "I2S(id=%u,\n"
|
|
|
|
"sck="MP_HAL_PIN_FMT ",\n"
|
|
|
|
"ws="MP_HAL_PIN_FMT ",\n"
|
|
|
|
"sd="MP_HAL_PIN_FMT ",\n"
|
|
|
|
"mck="MP_HAL_PIN_FMT ",\n"
|
|
|
|
"mode=%u,\n"
|
|
|
|
"bits=%u, format=%u,\n"
|
|
|
|
"rate=%d, ibuf=%d)",
|
|
|
|
self->i2s_id,
|
|
|
|
mp_hal_pin_name(self->sck),
|
|
|
|
mp_hal_pin_name(self->ws),
|
|
|
|
mp_hal_pin_name(self->sd),
|
|
|
|
mp_hal_pin_name(self->mck),
|
|
|
|
self->mode,
|
|
|
|
self->bits, self->format,
|
|
|
|
self->rate, self->ibuf
|
|
|
|
);
|
|
|
|
}
|
|
|
|
|
2023-10-09 02:12:18 +01:00
|
|
|
STATIC machine_i2s_obj_t *mp_machine_i2s_make_new_instance(mp_int_t i2s_id) {
|
2021-11-29 17:50:34 +00:00
|
|
|
if (i2s_id < 1 || i2s_id > MICROPY_HW_I2S_NUM) {
|
|
|
|
mp_raise_msg_varg(&mp_type_ValueError, MP_ERROR_TEXT("I2S(%d) does not exist"), i2s_id);
|
|
|
|
}
|
|
|
|
|
|
|
|
uint8_t i2s_id_zero_base = i2s_id - 1;
|
|
|
|
|
|
|
|
machine_i2s_obj_t *self;
|
|
|
|
if (MP_STATE_PORT(machine_i2s_obj)[i2s_id_zero_base] == NULL) {
|
2022-04-22 08:09:15 +01:00
|
|
|
self = mp_obj_malloc(machine_i2s_obj_t, &machine_i2s_type);
|
2021-11-29 17:50:34 +00:00
|
|
|
MP_STATE_PORT(machine_i2s_obj)[i2s_id_zero_base] = self;
|
|
|
|
self->i2s_id = i2s_id;
|
|
|
|
self->edmaTcd = &edmaTcd[i2s_id_zero_base];
|
|
|
|
} else {
|
|
|
|
self = MP_STATE_PORT(machine_i2s_obj)[i2s_id_zero_base];
|
|
|
|
machine_i2s_deinit(MP_OBJ_FROM_PTR(self));
|
|
|
|
}
|
|
|
|
|
|
|
|
// align DMA buffer to the cache line size (32 bytes)
|
|
|
|
self->dma_buffer_dcache_aligned = (uint8_t *)((uint32_t)(self->dma_buffer + 0x1f) & ~0x1f);
|
|
|
|
|
|
|
|
// fill the DMA buffer with NULLs
|
|
|
|
memset(self->dma_buffer_dcache_aligned, 0, SIZEOF_DMA_BUFFER_IN_BYTES);
|
|
|
|
|
2023-10-09 02:12:18 +01:00
|
|
|
return self;
|
2021-11-29 17:50:34 +00:00
|
|
|
}
|
|
|
|
|
2023-10-09 02:12:18 +01:00
|
|
|
STATIC void mp_machine_i2s_deinit(machine_i2s_obj_t *self) {
|
2021-11-29 17:50:34 +00:00
|
|
|
// use self->i2s_inst as in indication that I2S object has already been de-initialized
|
|
|
|
if (self->i2s_inst != NULL) {
|
|
|
|
EDMA_AbortTransfer(&self->edmaHandle);
|
|
|
|
|
|
|
|
if (self->mode == TX) {
|
|
|
|
SAI_TxSetChannelFIFOMask(self->i2s_inst, 0);
|
|
|
|
SAI_TxEnableDMA(self->i2s_inst, kSAI_FIFORequestDMAEnable, false);
|
|
|
|
SAI_TxEnable(self->i2s_inst, false);
|
|
|
|
SAI_TxReset(self->i2s_inst);
|
|
|
|
} else { // RX
|
|
|
|
SAI_RxSetChannelFIFOMask(self->i2s_inst, 0);
|
|
|
|
SAI_RxEnableDMA(self->i2s_inst, kSAI_FIFORequestDMAEnable, false);
|
|
|
|
SAI_RxEnable(self->i2s_inst, false);
|
|
|
|
SAI_RxReset(self->i2s_inst);
|
|
|
|
}
|
|
|
|
|
|
|
|
SAI_Deinit(self->i2s_inst);
|
|
|
|
free_dma_channel(self->dma_channel);
|
|
|
|
m_free(self->ring_buffer_storage);
|
|
|
|
self->i2s_inst = NULL; // flag object as de-initialized
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
STATIC mp_obj_t machine_i2s_irq(mp_obj_t self_in, mp_obj_t handler) {
|
|
|
|
machine_i2s_obj_t *self = MP_OBJ_TO_PTR(self_in);
|
|
|
|
if (handler != mp_const_none && !mp_obj_is_callable(handler)) {
|
|
|
|
mp_raise_ValueError(MP_ERROR_TEXT("invalid callback"));
|
|
|
|
}
|
|
|
|
|
|
|
|
if (handler != mp_const_none) {
|
|
|
|
self->io_mode = NON_BLOCKING;
|
|
|
|
} else {
|
|
|
|
self->io_mode = BLOCKING;
|
|
|
|
}
|
|
|
|
|
|
|
|
self->callback_for_non_blocking = handler;
|
|
|
|
return mp_const_none;
|
|
|
|
}
|
|
|
|
STATIC MP_DEFINE_CONST_FUN_OBJ_2(machine_i2s_irq_obj, machine_i2s_irq);
|
|
|
|
|
2022-07-01 20:46:44 +01:00
|
|
|
MP_REGISTER_ROOT_POINTER(struct _machine_i2s_obj_t *machine_i2s_obj[MICROPY_HW_I2S_NUM]);
|
|
|
|
|
2021-11-29 17:50:34 +00:00
|
|
|
#endif // MICROPY_PY_MACHINE_I2S
|