121 lines
4.2 KiB
C
121 lines
4.2 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2022 Joey Castillo
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*
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* Ported from MIT-licensed code from CircuitPython
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* Copyright (c) 2016, 2017 Scott Shawcroft for Adafruit Industries
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*
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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 all
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* 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 THE
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* SOFTWARE.
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*/
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#include "spiflash.h"
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#define SPI_FLASH_FAST_READ false
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static void flash_enable(void) {
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watch_set_pin_level(A3, false);
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}
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static void flash_disable(void) {
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watch_set_pin_level(A3, true);
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}
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static bool transfer(uint8_t *command, uint32_t command_length, uint8_t *data_in, uint8_t *data_out, uint32_t data_length) {
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bool status = watch_spi_write(command, command_length);
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if (status) {
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if (data_in != NULL && data_out != NULL) {
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status = watch_spi_transfer(data_out, data_in, data_length);
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} else if (data_out != NULL) {
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status = watch_spi_read(data_out, data_length);
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} else if (data_in != NULL) {
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status = watch_spi_write(data_in, data_length);
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}
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}
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flash_disable();
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return status;
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}
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static bool transfer_command(uint8_t command, uint8_t *data_in, uint8_t *data_out, uint32_t data_length) {
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return transfer(&command, 1, data_in, data_out, data_length);
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}
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bool spi_flash_command(uint8_t command) {
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return transfer_command(command, NULL, NULL, 0);
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}
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bool spi_flash_read_command(uint8_t command, uint8_t *data, uint32_t data_length) {
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return transfer_command(command, NULL, data, data_length);
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}
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bool spi_flash_write_command(uint8_t command, uint8_t *data, uint32_t data_length) {
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return transfer_command(command, data, NULL, data_length);
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}
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// Pack the low 24 bits of the address into a uint8_t array.
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static void address_to_bytes(uint32_t address, uint8_t *bytes) {
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bytes[0] = (address >> 16) & 0xff;
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bytes[1] = (address >> 8) & 0xff;
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bytes[2] = address & 0xff;
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}
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bool spi_flash_sector_command(uint8_t command, uint32_t address) {
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uint8_t request[4] = {command, 0x00, 0x00, 0x00};
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address_to_bytes(address, request + 1);
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return transfer(request, 4, NULL, NULL, 0);
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}
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bool spi_flash_write_data(uint32_t address, uint8_t *data, uint32_t data_length) {
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uint8_t request[4] = {CMD_PAGE_PROGRAM, 0x00, 0x00, 0x00};
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// Write the SPI flash write address into the bytes following the command byte.
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address_to_bytes(address, request + 1);
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flash_enable();
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bool status = watch_spi_write(request, 4);
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if (status) {
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status = watch_spi_write(data, data_length);
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}
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flash_disable();
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return status;
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}
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bool spi_flash_read_data(uint32_t address, uint8_t *data, uint32_t data_length) {
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uint8_t request[5] = {CMD_READ_DATA, 0x00, 0x00, 0x00};
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uint8_t command_length = 4;
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if (SPI_FLASH_FAST_READ) {
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request[0] = CMD_FAST_READ_DATA;
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command_length = 5;
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}
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// Write the SPI flash read address into the bytes following the command byte.
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address_to_bytes(address, request + 1);
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flash_enable();
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bool status = watch_spi_write(request, command_length);
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if (status) {
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status = watch_spi_read(data, data_length);
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}
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flash_disable();
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return status;
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}
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void spi_flash_init(void) {
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gpio_set_pin_level(A3, true);
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gpio_set_pin_direction(A3, GPIO_DIRECTION_OUT);
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watch_enable_spi();
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}
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