146 lines
6.2 KiB
C
146 lines
6.2 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) 2013-2018 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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#include "py/runtime.h"
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#include "extmod/machine_spi.h"
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#include "spi.h"
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/******************************************************************************/
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// Implementation of hard SPI for machine module
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STATIC const machine_hard_spi_obj_t machine_hard_spi_obj[] = {
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{{&machine_hard_spi_type}, &spi_obj[0]},
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{{&machine_hard_spi_type}, &spi_obj[1]},
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{{&machine_hard_spi_type}, &spi_obj[2]},
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{{&machine_hard_spi_type}, &spi_obj[3]},
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{{&machine_hard_spi_type}, &spi_obj[4]},
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{{&machine_hard_spi_type}, &spi_obj[5]},
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};
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STATIC void machine_hard_spi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hard_spi_obj_t *self = MP_OBJ_TO_PTR(self_in);
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spi_print(print, self->spi, false);
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}
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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) {
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MP_MACHINE_SPI_CHECK_FOR_LEGACY_SOFTSPI_CONSTRUCTION(n_args, n_kw, all_args);
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enum { ARG_id, ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit, ARG_sck, ARG_mosi, ARG_miso };
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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_INT, {.u_int = 500000} },
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{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 0} },
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{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = 8} },
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{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = SPI_FIRSTBIT_MSB} },
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{ MP_QSTR_sck, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_mosi, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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{ MP_QSTR_miso, MP_ARG_KW_ONLY | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
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};
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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 spi_id = spi_find_index(args[ARG_id].u_obj);
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const machine_hard_spi_obj_t *self = &machine_hard_spi_obj[spi_id - 1];
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// here we would check the sck/mosi/miso pins and configure them, but it's not implemented
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if (args[ARG_sck].u_obj != MP_OBJ_NULL
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|| args[ARG_mosi].u_obj != MP_OBJ_NULL
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|| args[ARG_miso].u_obj != MP_OBJ_NULL) {
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mp_raise_ValueError(MP_ERROR_TEXT("explicit choice of sck/mosi/miso is not implemented"));
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}
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// set the SPI configuration values
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SPI_InitTypeDef *init = &self->spi->spi->Init;
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init->Mode = SPI_MODE_MASTER;
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// these parameters are not currently configurable
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init->Direction = SPI_DIRECTION_2LINES;
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init->NSS = SPI_NSS_SOFT;
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init->TIMode = SPI_TIMODE_DISABLE;
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init->CRCCalculation = SPI_CRCCALCULATION_DISABLE;
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init->CRCPolynomial = 0;
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// set configurable paramaters
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spi_set_params(self->spi, 0xffffffff, args[ARG_baudrate].u_int,
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args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
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args[ARG_firstbit].u_int);
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// init the SPI bus
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spi_init(self->spi, false);
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return MP_OBJ_FROM_PTR(self);
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}
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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) {
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machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
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enum { ARG_baudrate, ARG_polarity, ARG_phase, ARG_bits, ARG_firstbit };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_baudrate, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_polarity, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_phase, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_bits, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_firstbit, MP_ARG_KW_ONLY | MP_ARG_INT, {.u_int = -1} },
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};
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mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
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mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
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// set the SPI configuration values
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spi_set_params(self->spi, 0xffffffff, args[ARG_baudrate].u_int,
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args[ARG_polarity].u_int, args[ARG_phase].u_int, args[ARG_bits].u_int,
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args[ARG_firstbit].u_int);
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// re-init the SPI bus
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spi_init(self->spi, false);
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}
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STATIC void machine_hard_spi_deinit(mp_obj_base_t *self_in) {
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machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
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spi_deinit(self->spi);
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}
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STATIC void machine_hard_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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machine_hard_spi_obj_t *self = (machine_hard_spi_obj_t *)self_in;
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spi_transfer(self->spi, len, src, dest, SPI_TRANSFER_TIMEOUT(len));
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}
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STATIC const mp_machine_spi_p_t machine_hard_spi_p = {
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.init = machine_hard_spi_init,
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.deinit = machine_hard_spi_deinit,
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.transfer = machine_hard_spi_transfer,
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};
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const mp_obj_type_t machine_hard_spi_type = {
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{ &mp_type_type },
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.name = MP_QSTR_SPI,
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.print = machine_hard_spi_print,
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.make_new = machine_hard_spi_make_new,
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.protocol = &machine_hard_spi_p,
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.locals_dict = (mp_obj_dict_t *)&mp_machine_spi_locals_dict,
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};
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