187 lines
6.6 KiB
C
187 lines
6.6 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) 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 <stdint.h>
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#include <string.h>
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#include "ets_sys.h"
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#include "etshal.h"
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#include "ets_alt_task.h"
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#include "py/runtime.h"
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#include "py/stream.h"
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#include "py/mphal.h"
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#include "extmod/machine_spi.h"
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#include "modmachine.h"
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#include "hspi.h"
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#if MICROPY_PY_MACHINE_SPI
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typedef struct _machine_hspi_obj_t {
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mp_obj_base_t base;
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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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} machine_hspi_obj_t;
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STATIC void machine_hspi_transfer(mp_obj_base_t *self_in, size_t len, const uint8_t *src, uint8_t *dest) {
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(void)self_in;
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if (dest == NULL) {
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// fast case when we only need to write data
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size_t chunk_size = 1024;
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size_t count = len / chunk_size;
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size_t i = 0;
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for (size_t j = 0; j < count; ++j) {
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for (size_t k = 0; k < chunk_size; ++k) {
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spi_tx8fast(HSPI, src[i]);
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++i;
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}
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ets_loop_iter();
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}
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while (i < len) {
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spi_tx8fast(HSPI, src[i]);
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++i;
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}
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// wait for SPI transaction to complete
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while (spi_busy(HSPI)) {
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}
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} else {
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// we need to read and write data
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// Process data in chunks, let the pending tasks run in between
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size_t chunk_size = 1024; // TODO this should depend on baudrate
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size_t count = len / chunk_size;
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size_t i = 0;
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for (size_t j = 0; j < count; ++j) {
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for (size_t k = 0; k < chunk_size; ++k) {
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dest[i] = spi_transaction(HSPI, 0, 0, 0, 0, 8, src[i], 8, 0);
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++i;
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}
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ets_loop_iter();
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}
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while (i < len) {
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dest[i] = spi_transaction(HSPI, 0, 0, 0, 0, 8, src[i], 8, 0);
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++i;
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}
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}
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}
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/******************************************************************************/
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// MicroPython bindings for HSPI
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STATIC void machine_hspi_print(const mp_print_t *print, mp_obj_t self_in, mp_print_kind_t kind) {
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machine_hspi_obj_t *self = MP_OBJ_TO_PTR(self_in);
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mp_printf(print, "HSPI(id=1, baudrate=%u, polarity=%u, phase=%u)",
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self->baudrate, self->polarity, self->phase);
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}
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STATIC void machine_hspi_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_hspi_obj_t *self = (machine_hspi_obj_t *)self_in;
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enum { ARG_baudrate, ARG_polarity, ARG_phase };
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static const mp_arg_t allowed_args[] = {
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{ MP_QSTR_baudrate, MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_polarity, MP_ARG_INT, {.u_int = -1} },
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{ MP_QSTR_phase, 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),
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allowed_args, args);
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if (args[ARG_baudrate].u_int != -1) {
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self->baudrate = args[ARG_baudrate].u_int;
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}
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if (args[ARG_polarity].u_int != -1) {
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self->polarity = args[ARG_polarity].u_int;
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}
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if (args[ARG_phase].u_int != -1) {
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self->phase = args[ARG_phase].u_int;
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}
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if (self->baudrate == 80000000L) {
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// Special case for full speed.
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spi_init_gpio(HSPI, SPI_CLK_80MHZ_NODIV);
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spi_clock(HSPI, 0, 0);
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} else if (self->baudrate > 40000000L) {
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mp_raise_ValueError(MP_ERROR_TEXT("impossible baudrate"));
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} else {
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uint32_t divider = 40000000L / self->baudrate;
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uint16_t prediv = MIN(divider, SPI_CLKDIV_PRE + 1);
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uint16_t cntdiv = (divider / prediv) * 2; // cntdiv has to be even
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if (cntdiv > SPI_CLKCNT_N + 1 || cntdiv == 0 || prediv == 0) {
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mp_raise_ValueError(MP_ERROR_TEXT("impossible baudrate"));
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}
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self->baudrate = 80000000L / (prediv * cntdiv);
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spi_init_gpio(HSPI, SPI_CLK_USE_DIV);
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spi_clock(HSPI, prediv, cntdiv);
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}
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// TODO: Make the byte order configurable too (discuss param names)
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spi_tx_byte_order(HSPI, SPI_BYTE_ORDER_HIGH_TO_LOW);
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spi_rx_byte_order(HSPI, SPI_BYTE_ORDER_HIGH_TO_LOW);
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CLEAR_PERI_REG_MASK(SPI_USER(HSPI), SPI_FLASH_MODE | SPI_USR_MISO |
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SPI_USR_ADDR | SPI_USR_COMMAND | SPI_USR_DUMMY);
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// Clear Dual or Quad lines transmission mode
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CLEAR_PERI_REG_MASK(SPI_CTRL(HSPI), SPI_QIO_MODE | SPI_DIO_MODE |
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SPI_DOUT_MODE | SPI_QOUT_MODE);
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spi_mode(HSPI, self->phase, self->polarity);
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}
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mp_obj_t machine_hspi_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
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// args[0] holds the id of the peripheral
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if (args[0] != MP_OBJ_NEW_SMALL_INT(1)) {
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// FlashROM is on SPI0, so far we don't support its usage
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mp_raise_ValueError(NULL);
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}
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machine_hspi_obj_t *self = m_new_obj(machine_hspi_obj_t);
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self->base.type = &machine_hspi_type;
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// set defaults
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self->baudrate = 80000000L;
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self->polarity = 0;
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self->phase = 0;
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mp_map_t kw_args;
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mp_map_init_fixed_table(&kw_args, n_kw, args + n_args);
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machine_hspi_init((mp_obj_base_t *)self, n_args - 1, args + 1, &kw_args);
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return MP_OBJ_FROM_PTR(self);
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}
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STATIC const mp_machine_spi_p_t machine_hspi_p = {
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.init = machine_hspi_init,
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.transfer = machine_hspi_transfer,
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};
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const mp_obj_type_t machine_hspi_type = {
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{ &mp_type_type },
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.name = MP_QSTR_HSPI,
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.print = machine_hspi_print,
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.make_new = mp_machine_spi_make_new, // delegate to master constructor
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.protocol = &machine_hspi_p,
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.locals_dict = (mp_obj_dict_t *)&mp_machine_spi_locals_dict,
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};
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#endif // MICROPY_PY_MACHINE_SPI
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