kopia lustrzana https://github.com/micropython/micropython
120 wiersze
4.8 KiB
C
120 wiersze
4.8 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) 2016 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 <stdio.h>
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#include <string.h>
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#include "py/runtime.h"
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#include "extmod/machine_spi.h"
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#if MICROPY_PY_MACHINE_SPI
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void mp_machine_soft_spi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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mp_machine_soft_spi_obj_t *self = (mp_machine_soft_spi_obj_t*)self_in;
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uint32_t delay_half = self->delay_half;
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// only MSB transfer is implemented
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = src[i];
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uint8_t data_in = 0;
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for (int j = 0; j < 8; ++j, data_out <<= 1) {
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mp_hal_pin_write(self->mosi, (data_out >> 7) & 1);
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if (self->phase == 0) {
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mp_hal_delay_us_fast(delay_half);
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mp_hal_pin_write(self->sck, 1 - self->polarity);
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} else {
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mp_hal_pin_write(self->sck, 1 - self->polarity);
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mp_hal_delay_us_fast(delay_half);
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}
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data_in = (data_in << 1) | mp_hal_pin_read(self->miso);
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if (self->phase == 0) {
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mp_hal_delay_us_fast(delay_half);
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mp_hal_pin_write(self->sck, self->polarity);
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} else {
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mp_hal_pin_write(self->sck, self->polarity);
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mp_hal_delay_us_fast(delay_half);
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}
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}
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if (dest != NULL) {
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dest[i] = data_in;
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}
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// Some ports need a regular callback, but probably we don't need
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// to do this every byte, or even at all.
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#ifdef MICROPY_EVENT_POLL_HOOK
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MICROPY_EVENT_POLL_HOOK;
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#endif
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}
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}
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STATIC void mp_machine_spi_transfer(mp_obj_t self, size_t len, const void *src, void *dest) {
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mp_obj_base_t *s = (mp_obj_base_t*)MP_OBJ_TO_PTR(self);
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mp_machine_spi_p_t *spi_p = (mp_machine_spi_p_t*)s->type->protocol;
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spi_p->transfer(s, len, src, dest);
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}
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STATIC mp_obj_t mp_machine_spi_read(size_t n_args, const mp_obj_t *args) {
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vstr_t vstr;
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vstr_init_len(&vstr, mp_obj_get_int(args[1]));
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memset(vstr.buf, n_args == 3 ? mp_obj_get_int(args[2]) : 0, vstr.len);
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mp_machine_spi_transfer(args[0], vstr.len, vstr.buf, vstr.buf);
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return mp_obj_new_str_from_vstr(&mp_type_bytes, &vstr);
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_read_obj, 2, 3, mp_machine_spi_read);
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STATIC mp_obj_t mp_machine_spi_readinto(size_t n_args, const mp_obj_t *args) {
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mp_buffer_info_t bufinfo;
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mp_get_buffer_raise(args[1], &bufinfo, MP_BUFFER_WRITE);
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memset(bufinfo.buf, n_args == 3 ? mp_obj_get_int(args[2]) : 0, bufinfo.len);
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mp_machine_spi_transfer(args[0], bufinfo.len, bufinfo.buf, bufinfo.buf);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_machine_spi_readinto_obj, 2, 3, mp_machine_spi_readinto);
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STATIC mp_obj_t mp_machine_spi_write(mp_obj_t self, mp_obj_t wr_buf) {
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mp_buffer_info_t src;
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mp_get_buffer_raise(wr_buf, &src, MP_BUFFER_READ);
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mp_machine_spi_transfer(self, src.len, (const uint8_t*)src.buf, NULL);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_2(mp_machine_spi_write_obj, mp_machine_spi_write);
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STATIC mp_obj_t mp_machine_spi_write_readinto(mp_obj_t self, mp_obj_t wr_buf, mp_obj_t rd_buf) {
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mp_buffer_info_t src;
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mp_get_buffer_raise(wr_buf, &src, MP_BUFFER_READ);
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mp_buffer_info_t dest;
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mp_get_buffer_raise(rd_buf, &dest, MP_BUFFER_WRITE);
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if (src.len != dest.len) {
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mp_raise_ValueError("buffers must be the same length");
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}
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mp_machine_spi_transfer(self, src.len, src.buf, dest.buf);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_3(mp_machine_spi_write_readinto_obj, mp_machine_spi_write_readinto);
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#endif // MICROPY_PY_MACHINE_SPI
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