circuitpython/ports/stm32/machine_spi.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013-2018 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "py/runtime.h"
#include "extmod/machine_spi.h"
#include "spi.h"
/******************************************************************************/
// Implementation of hard SPI for machine module
STATIC const machine_hard_spi_obj_t machine_hard_spi_obj[] = {
{{&machine_hard_spi_type}, &spi_obj[0]},
{{&machine_hard_spi_type}, &spi_obj[1]},
{{&machine_hard_spi_type}, &spi_obj[2]},
{{&machine_hard_spi_type}, &spi_obj[3]},
{{&machine_hard_spi_type}, &spi_obj[4]},
{{&machine_hard_spi_type}, &spi_obj[5]},
};
STATIC void machine_hard_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
machine_hard_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
spi_print(print, self->spi, false);
}
mp_obj_t machine_hard_spi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *all_args) {
MP_MACHINE_SPI_CHECK_FOR_LEGACY_SOFTSPI_CONSTRUCTION(n_args, n_kw, all_args);
enum { ARG_id, ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit, ARG_sck, ARG_mosi, ARG_miso };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_id, MP_ARG_REQUIRED | MP_ARG_OBJ },
{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = 500000} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_FIRSTBIT_MSB} },
{ MP_QSTR_sck, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_mosi, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
{ MP_QSTR_miso, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all_kw_array(n_args, n_kw, all_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// get static peripheral object
int spi_id = spi_find_index(args[ARG_id].u_obj);
const machine_hard_spi_obj_t *self = &machine_hard_spi_obj[spi_id - 1];
// here we would check the sck/mosi/miso pins and configure them, but it's not implemented
if (args[ARG_sck].u_obj != MP_OBJ_NULL
|| args[ARG_mosi].u_obj != MP_OBJ_NULL
|| args[ARG_miso].u_obj != MP_OBJ_NULL) {
mp_raise_ValueError(MP_ERROR_TEXT("explicit choice of sck/mosi/miso is not implemented"));
}
// set the SPI configuration values
SPI_InitTypeDef *init = &self->spi->spi->Init;
init->Mode = SPI_MODE_MASTER;
// these parameters are not currently configurable
init->Direction = SPI_DIRECTION_2LINES;
init->NSS = SPI_NSS_SOFT;
init->TIMode = SPI_TIMODE_DISABLE;
init->CRCCalculation = SPI_CRCCALCULATION_DISABLE;
init->CRCPolynomial = 0;
// set configurable paramaters
spi_set_params(self->spi, 0xffffffff, args[ARG_baudrate].u_int,
args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
args[ARG_firstbit].u_int);
// init the SPI bus
spi_init(self->spi, false);
return MP_OBJ_FROM_PTR(self);
}
STATIC void machine_hard_spi_init(mp_obj_base_t *self_in, size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit };
static const mp_arg_t allowed_args[] = {
{ MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
};
mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
// set the SPI configuration values
spi_set_params(self->spi, 0xffffffff, args[ARG_baudrate].u_int,
args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
args[ARG_firstbit].u_int);
// re-init the SPI bus
spi_init(self->spi, false);
}
STATIC void machine_hard_spi_deinit(mp_obj_base_t *self_in) {
machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
spi_deinit(self->spi);
}
STATIC void machine_hard_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
spi_transfer(self->spi, len, src, dest, SPI_TRANSFER_TIMEOUT(len));
}
STATIC const mp_machine_spi_p_t machine_hard_spi_p = {
.init = machine_hard_spi_init,
.deinit = machine_hard_spi_deinit,
.transfer = machine_hard_spi_transfer,
};
const mp_obj_type_t machine_hard_spi_type = {
{ &mp_type_type },
.name = MP_QSTR_SPI,
.print = machine_hard_spi_print,
.make_new = machine_hard_spi_make_new,
.protocol = &machine_hard_spi_p,
.locals_dict = (mp_obj_dict_t *)&mp_machine_spi_locals_dict,
};