78 lines
2.8 KiB
C
78 lines
2.8 KiB
C
/*
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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) 2013, 2014 Damien P. George
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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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#ifndef MICROPY_INCLUDED_STM32_SPI_H
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#define MICROPY_INCLUDED_STM32_SPI_H
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#include "drivers/bus/spi.h"
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#include "dma.h"
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typedef struct _spi_t {
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SPI_HandleTypeDef *spi;
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const dma_descr_t *tx_dma_descr;
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const dma_descr_t *rx_dma_descr;
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} spi_t;
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typedef struct _spi_proto_cfg_t {
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const spi_t *spi;
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uint32_t baudrate;
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uint8_t polarity;
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uint8_t phase;
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uint8_t bits;
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uint8_t firstbit;
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} spi_proto_cfg_t;
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typedef struct _pyb_spi_obj_t {
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mp_obj_base_t base;
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const spi_t *spi;
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} pyb_spi_obj_t;
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typedef struct _machine_hard_spi_obj_t {
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mp_obj_base_t base;
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const spi_t *spi;
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} machine_hard_spi_obj_t;
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extern const spi_t spi_obj[6];
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extern const mp_spi_proto_t spi_proto;
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extern const mp_obj_type_t pyb_spi_type;
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// A transfer of "len" bytes should take len*8*1000/baudrate milliseconds.
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// To simplify the calculation we assume the baudrate is never less than 8kHz
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// and use that value for the baudrate in the formula, plus a small constant.
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#define SPI_TRANSFER_TIMEOUT(len) ((len) + 100)
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void spi_init0(void);
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int spi_init(const spi_t *spi, bool enable_nss_pin);
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void spi_deinit(const spi_t *spi_obj);
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int spi_find_index(mp_obj_t id);
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void spi_set_params(const spi_t *spi_obj, uint32_t prescale, int32_t baudrate,
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int32_t polarity, int32_t phase, int32_t bits, int32_t firstbit);
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void spi_transfer(const spi_t *self, size_t len, const uint8_t *src, uint8_t *dest, uint32_t timeout);
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void spi_print(const mp_print_t *print, const spi_t *spi_obj, bool legacy);
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const spi_t *spi_from_mp_obj(mp_obj_t o);
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#endif // MICROPY_INCLUDED_STM32_SPI_H
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