306 lines
12 KiB
C
306 lines
12 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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* SPDX-FileCopyrightText: Copyright (c) 2013, 2014 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/mpconfig.h"
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#include "py/obj.h"
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#include "py/runtime.h"
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#include "common-hal/microcontroller/Pin.h"
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#include "shared-bindings/microcontroller/__init__.h"
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#include "shared-bindings/digitalio/DigitalInOut.h"
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#include "shared-module/bitbangio/types.h"
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#include "supervisor/shared/translate.h"
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#define MAX_BAUDRATE (common_hal_mcu_get_clock_frequency() / 48)
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void shared_module_bitbangio_spi_construct(bitbangio_spi_obj_t *self,
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const mcu_pin_obj_t * clock, const mcu_pin_obj_t * mosi,
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const mcu_pin_obj_t * miso) {
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digitalinout_result_t result = common_hal_digitalio_digitalinout_construct(&self->clock, clock);
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if (result != DIGITALINOUT_OK) {
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mp_raise_ValueError(translate("Clock pin init failed."));
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}
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common_hal_digitalio_digitalinout_switch_to_output(&self->clock, self->polarity == 1, DRIVE_MODE_PUSH_PULL);
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if (mosi != NULL) {
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result = common_hal_digitalio_digitalinout_construct(&self->mosi, mosi);
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if (result != DIGITALINOUT_OK) {
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common_hal_digitalio_digitalinout_deinit(&self->clock);
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mp_raise_ValueError(translate("MOSI pin init failed."));
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}
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self->has_mosi = true;
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common_hal_digitalio_digitalinout_switch_to_output(&self->mosi, false, DRIVE_MODE_PUSH_PULL);
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}
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if (miso != NULL) {
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// Starts out as input by default, no need to change.
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result = common_hal_digitalio_digitalinout_construct(&self->miso, miso);
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if (result != DIGITALINOUT_OK) {
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common_hal_digitalio_digitalinout_deinit(&self->clock);
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if (mosi != NULL) {
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common_hal_digitalio_digitalinout_deinit(&self->mosi);
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}
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mp_raise_ValueError(translate("MISO pin init failed."));
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}
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self->has_miso = true;
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}
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self->delay_half = 5;
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self->polarity = 0;
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self->phase = 0;
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}
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bool shared_module_bitbangio_spi_deinited(bitbangio_spi_obj_t *self) {
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return common_hal_digitalio_digitalinout_deinited(&self->clock);
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}
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void shared_module_bitbangio_spi_deinit(bitbangio_spi_obj_t *self) {
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if (shared_module_bitbangio_spi_deinited(self)) {
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return;
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}
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common_hal_digitalio_digitalinout_deinit(&self->clock);
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if (self->has_mosi) {
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common_hal_digitalio_digitalinout_deinit(&self->mosi);
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}
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if (self->has_miso) {
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common_hal_digitalio_digitalinout_deinit(&self->miso);
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}
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}
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void shared_module_bitbangio_spi_configure(bitbangio_spi_obj_t *self,
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uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t bits) {
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self->delay_half = 500000 / baudrate;
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// round delay_half up so that: actual_baudrate <= requested_baudrate
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if (500000 % baudrate != 0) {
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self->delay_half += 1;
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}
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self->polarity = polarity;
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self->phase = phase;
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}
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bool shared_module_bitbangio_spi_try_lock(bitbangio_spi_obj_t *self) {
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bool success = false;
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common_hal_mcu_disable_interrupts();
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if (!self->locked) {
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self->locked = true;
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success = true;
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}
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common_hal_mcu_enable_interrupts();
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return success;
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}
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bool shared_module_bitbangio_spi_has_lock(bitbangio_spi_obj_t *self) {
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return self->locked;
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}
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void shared_module_bitbangio_spi_unlock(bitbangio_spi_obj_t *self) {
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self->locked = false;
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}
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// Writes out the given data.
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bool shared_module_bitbangio_spi_write(bitbangio_spi_obj_t *self, const uint8_t *data, size_t len) {
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if (len > 0 && !self->has_mosi) {
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mp_raise_ValueError(translate("Cannot write without MOSI pin."));
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}
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uint32_t delay_half = self->delay_half;
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// only MSB transfer is implemented
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// If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY, and the configured
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// delay_half is equal to this value, then the software SPI implementation
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// will run as fast as possible, limited only by CPU speed and GPIO time.
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#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
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if (delay_half <= MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = data[i];
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for (int j = 0; j < 8; ++j, data_out <<= 1) {
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common_hal_digitalio_digitalinout_set_value(&self->mosi, (data_out >> 7) & 1);
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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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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}
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return true;
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}
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#endif
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = data[i];
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for (int j = 0; j < 8; ++j, data_out <<= 1) {
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common_hal_digitalio_digitalinout_set_value(&self->mosi, (data_out >> 7) & 1);
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if (self->phase == 0) {
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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} else {
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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common_hal_mcu_delay_us(delay_half);
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}
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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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return true;
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}
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// Reads in len bytes while outputting zeroes.
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bool shared_module_bitbangio_spi_read(bitbangio_spi_obj_t *self, uint8_t *data, size_t len) {
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if (len > 0 && !self->has_miso) {
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mp_raise_ValueError(translate("Cannot read without MISO pin."));
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}
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uint32_t delay_half = self->delay_half;
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// only MSB transfer is implemented
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// If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY, and the configured
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// delay_half is equal to this value, then the software SPI implementation
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// will run as fast as possible, limited only by CPU speed and GPIO time.
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#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
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if (delay_half <= MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
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// Clock out zeroes while we read.
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if (self->has_mosi) {
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common_hal_digitalio_digitalinout_set_value(&self->mosi, false);
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}
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for (size_t i = 0; i < len; ++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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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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data_in = (data_in << 1) | common_hal_digitalio_digitalinout_get_value(&self->miso);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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}
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data[i] = data_in;
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}
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return true;
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}
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#endif
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if (self->has_mosi) {
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common_hal_digitalio_digitalinout_set_value(&self->mosi, false);
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}
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_in = 0;
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for (int j = 0; j < 8; ++j) {
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if (self->phase == 0) {
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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} else {
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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common_hal_mcu_delay_us(delay_half);
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}
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data_in = (data_in << 1) | common_hal_digitalio_digitalinout_get_value(&self->miso);
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if (self->phase == 0) {
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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} else {
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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common_hal_mcu_delay_us(delay_half);
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}
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}
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data[i] = data_in;
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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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return true;
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}
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// transfer
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bool shared_module_bitbangio_spi_transfer(bitbangio_spi_obj_t *self, const uint8_t *dout, uint8_t *din, size_t len) {
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if (len > 0 && (!self->has_mosi || !self->has_miso) ) {
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mp_raise_ValueError(translate("Cannot transfer without MOSI and MISO pins."));
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}
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uint32_t delay_half = self->delay_half;
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// only MSB transfer is implemented
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// If a port defines MICROPY_PY_MACHINE_SPI_MIN_DELAY, and the configured
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// delay_half is equal to this value, then the software SPI implementation
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// will run as fast as possible, limited only by CPU speed and GPIO time.
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#ifdef MICROPY_PY_MACHINE_SPI_MIN_DELAY
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if (delay_half <= MICROPY_PY_MACHINE_SPI_MIN_DELAY) {
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = dout[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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common_hal_digitalio_digitalinout_set_value(&self->mosi, (data_out >> 7) & 1);
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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data_in = (data_in << 1) | common_hal_digitalio_digitalinout_get_value(&self->miso);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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}
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din[i] = data_in;
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if (dest != NULL) {
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dest[i] = data_in;
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}
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}
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return true;
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}
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#endif
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for (size_t i = 0; i < len; ++i) {
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uint8_t data_out = dout[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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common_hal_digitalio_digitalinout_set_value(&self->mosi, (data_out >> 7) & 1);
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if (self->phase == 0) {
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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} else {
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common_hal_digitalio_digitalinout_set_value(&self->clock, 1 - self->polarity);
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common_hal_mcu_delay_us(delay_half);
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}
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data_in = (data_in << 1) | common_hal_digitalio_digitalinout_get_value(&self->miso);
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if (self->phase == 0) {
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common_hal_mcu_delay_us(delay_half);
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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} else {
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common_hal_digitalio_digitalinout_set_value(&self->clock, self->polarity);
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common_hal_mcu_delay_us(delay_half);
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}
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}
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din[i] = data_in;
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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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return true;
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}
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