302 lines
9.6 KiB
C
302 lines
9.6 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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* Copyright (c) 2015 Glenn Ruben Bakke
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* Copyright (c) 2018 Ayke van Laethem
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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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#include <stdbool.h>
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#include <string.h>
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#include <stdarg.h>
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#include "py/nlr.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mperrno.h"
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#include "py/mphal.h"
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#include "pin.h"
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#include "genhdr/pins.h"
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#include "uart.h"
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#include "mpconfigboard.h"
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#include "nrf.h"
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#include "mphalport.h"
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#include "nrfx_uart.h"
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#if MICROPY_PY_MACHINE_UART
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typedef struct _machine_hard_uart_obj_t {
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mp_obj_base_t base;
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const nrfx_uart_t * p_uart; // Driver instance
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} machine_hard_uart_obj_t;
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static const nrfx_uart_t instance0 = NRFX_UART_INSTANCE(0);
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STATIC const machine_hard_uart_obj_t machine_hard_uart_obj[] = {
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{{&machine_hard_uart_type}, .p_uart = &instance0},
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};
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void uart_init0(void) {
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}
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STATIC int uart_find(mp_obj_t id) {
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// given an integer id
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int uart_id = mp_obj_get_int(id);
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if (uart_id >= 0 && uart_id < MP_ARRAY_SIZE(machine_hard_uart_obj)) {
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return uart_id;
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}
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mp_raise_ValueError("UART doesn't exist");
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}
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void uart_irq_handler(mp_uint_t uart_id) {
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}
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bool uart_rx_any(const machine_hard_uart_obj_t *uart_obj) {
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// TODO: uart will block for now.
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return true;
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}
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int uart_rx_char(const machine_hard_uart_obj_t * self) {
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uint8_t ch;
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nrfx_uart_rx(self->p_uart, &ch, 1);
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return (int)ch;
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}
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STATIC nrfx_err_t uart_tx_char(const machine_hard_uart_obj_t * self, int c) {
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while (nrfx_uart_tx_in_progress(self->p_uart)) {
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;
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}
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return nrfx_uart_tx(self->p_uart, (uint8_t *)&c, 1);
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}
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void uart_tx_strn(const machine_hard_uart_obj_t *uart_obj, const char *str, uint len) {
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for (const char *top = str + len; str < top; str++) {
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uart_tx_char(uart_obj, *str);
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}
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}
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void uart_tx_strn_cooked(const machine_hard_uart_obj_t *uart_obj, const char *str, uint len) {
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for (const char *top = str + len; str < top; str++) {
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if (*str == '\n') {
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uart_tx_char(uart_obj, '\r');
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}
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uart_tx_char(uart_obj, *str);
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}
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}
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/******************************************************************************/
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/* MicroPython bindings */
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STATIC void machine_hard_uart_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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}
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/// \method init(id, baudrate)
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///
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/// Initialise the UART bus with the given parameters:
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/// - `id`is bus id.
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/// - `baudrate` is the clock rate.
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STATIC mp_obj_t machine_hard_uart_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
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enum { ARG_id, ARG_baudrate };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
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{ MP_QSTR_baudrate, MP_ARG_REQUIRED | MP_ARG_INT, {.u_int = 9600} },
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};
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// parse args
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// get static peripheral object
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int uart_id = uart_find(args[ARG_id].u_obj);
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const machine_hard_uart_obj_t * self = &machine_hard_uart_obj[uart_id];
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nrfx_uart_config_t config;
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// flow control
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#if MICROPY_HW_UART1_HWFC
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config.hwfc = NRF_UART_HWFC_ENABLED;
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#else
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config.hwfc = NRF_UART_HWFC_DISABLED;
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#endif
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config.parity = NRF_UART_PARITY_EXCLUDED;
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#if (BLUETOOTH_SD == 100)
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config.interrupt_priority = 3;
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#else
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config.interrupt_priority = 6;
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#endif
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// These baudrates are not supported, it seems.
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if (args[ARG_baudrate].u_int < 1200 || args[ARG_baudrate].u_int > 1000000) {
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mp_raise_ValueError("UART baudrate not supported");
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}
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// Magic: calculate 'baudrate' register from the input number.
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// Every value listed in the datasheet will be converted to the
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// correct register value, except for 192600. I believe the value
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// listed in the nrf52 datasheet (0x0EBED000) is incorrectly rounded
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// and should be 0x0EBEE000, as the nrf51 datasheet lists the
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// nonrounded value 0x0EBEDFA4.
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// Some background:
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// https://devzone.nordicsemi.com/f/nordic-q-a/391/uart-baudrate-register-values/2046#2046
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config.baudrate = args[ARG_baudrate].u_int / 400 * (uint32_t)(400ULL * (uint64_t)UINT32_MAX / 16000000ULL);
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config.baudrate = (config.baudrate + 0x800) & 0xffffff000; // rounding
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config.pseltxd = MICROPY_HW_UART1_TX;
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config.pselrxd = MICROPY_HW_UART1_RX;
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#if MICROPY_HW_UART1_HWFC
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config.pselrts = MICROPY_HW_UART1_RTS;
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config.pselcts = MICROPY_HW_UART1_CTS;
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#endif
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// Set context to this instance of UART
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config.p_context = (void *)self;
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// Set NULL as callback function to keep it blocking
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nrfx_uart_init(self->p_uart, &config, NULL);
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nrfx_uart_rx_enable(self->p_uart);
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return MP_OBJ_FROM_PTR(self);
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}
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/// \method writechar(char)
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/// Write a single character on the bus. `char` is an integer to write.
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/// Return value: `None`.
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STATIC mp_obj_t machine_hard_uart_writechar(mp_obj_t self_in, mp_obj_t char_in) {
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machine_hard_uart_obj_t *self = self_in;
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// get the character to write (might be 9 bits)
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int data = mp_obj_get_int(char_in);
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nrfx_err_t err = uart_tx_char(self, data);
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if (err != NRFX_SUCCESS) {
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mp_hal_raise(err);
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}
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_2(machine_hard_uart_writechar_obj, machine_hard_uart_writechar);
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/// \method readchar()
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/// Receive a single character on the bus.
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/// Return value: The character read, as an integer. Returns -1 on timeout.
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STATIC mp_obj_t machine_hard_uart_readchar(mp_obj_t self_in) {
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machine_hard_uart_obj_t *self = self_in;
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return MP_OBJ_NEW_SMALL_INT(uart_rx_char(self));
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_hard_uart_readchar_obj, machine_hard_uart_readchar);
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// uart.sendbreak()
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STATIC mp_obj_t machine_hard_uart_sendbreak(mp_obj_t self_in) {
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return mp_const_none;
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}
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STATIC MP_DEFINE_CONST_FUN_OBJ_1(machine_hard_uart_sendbreak_obj, machine_hard_uart_sendbreak);
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STATIC const mp_rom_map_elem_t machine_hard_uart_locals_dict_table[] = {
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// instance methods
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/// \method read([nbytes])
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{ MP_ROM_QSTR(MP_QSTR_read), MP_ROM_PTR(&mp_stream_read_obj) },
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/// \method readline()
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{ MP_ROM_QSTR(MP_QSTR_readline), MP_ROM_PTR(&mp_stream_unbuffered_readline_obj) },
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/// \method readinto(buf[, nbytes])
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{ MP_ROM_QSTR(MP_QSTR_readinto), MP_ROM_PTR(&mp_stream_readinto_obj) },
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/// \method writechar(buf)
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{ MP_ROM_QSTR(MP_QSTR_writechar), MP_ROM_PTR(&machine_hard_uart_writechar_obj) },
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{ MP_ROM_QSTR(MP_QSTR_readchar), MP_ROM_PTR(&machine_hard_uart_readchar_obj) },
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{ MP_ROM_QSTR(MP_QSTR_sendbreak), MP_ROM_PTR(&machine_hard_uart_sendbreak_obj) },
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// class constants
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/*
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{ MP_ROM_QSTR(MP_QSTR_RTS), MP_ROM_INT(UART_HWCONTROL_RTS) },
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{ MP_ROM_QSTR(MP_QSTR_CTS), MP_ROM_INT(UART_HWCONTROL_CTS) },
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*/
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};
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STATIC MP_DEFINE_CONST_DICT(machine_hard_uart_locals_dict, machine_hard_uart_locals_dict_table);
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STATIC mp_uint_t machine_hard_uart_read(mp_obj_t self_in, void *buf_in, mp_uint_t size, int *errcode) {
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const machine_hard_uart_obj_t *self = self_in;
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byte *buf = buf_in;
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// read the data
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for (size_t i = 0; i < size; i++) {
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buf[i] = uart_rx_char(self);
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}
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return size;
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}
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STATIC mp_uint_t machine_hard_uart_write(mp_obj_t self_in, const void *buf_in, mp_uint_t size, int *errcode) {
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machine_hard_uart_obj_t *self = self_in;
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const byte *buf = buf_in;
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nrfx_err_t err = NRFX_SUCCESS;
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for (int i = 0; i < size; i++) {
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err = uart_tx_char(self, (int)((uint8_t *)buf)[i]);
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}
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if (err == NRFX_SUCCESS) {
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// return number of bytes written
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return size;
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} else {
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*errcode = mp_hal_status_to_errno_table[err];
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return MP_STREAM_ERROR;
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}
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}
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STATIC mp_uint_t machine_hard_uart_ioctl(mp_obj_t self_in, mp_uint_t request, uintptr_t arg, int *errcode) {
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machine_hard_uart_obj_t *self = self_in;
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(void)self;
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return MP_STREAM_ERROR;
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}
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STATIC const mp_stream_p_t uart_stream_p = {
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.read = machine_hard_uart_read,
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.write = machine_hard_uart_write,
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.ioctl = machine_hard_uart_ioctl,
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.is_text = false,
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};
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const mp_obj_type_t machine_hard_uart_type = {
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{ &mp_type_type },
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.name = MP_QSTR_UART,
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.print = machine_hard_uart_print,
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.make_new = machine_hard_uart_make_new,
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.getiter = mp_identity_getiter,
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.iternext = mp_stream_unbuffered_iter,
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.protocol = &uart_stream_p,
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.locals_dict = (mp_obj_dict_t*)&machine_hard_uart_locals_dict,
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};
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#endif // MICROPY_PY_MACHINE_UART
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