mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
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85 lines
2.9 KiB
C
85 lines
2.9 KiB
C
/**
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* @file 0x0f_flash.c
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* @brief On-chip flash write/read demo using flash.c/flash.h
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* @author Kevin Thomas
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* @date 2025
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*
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* MIT License
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*
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* Copyright (c) 2025 Kevin Thomas
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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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* -----------------------------------------------------------------------------
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*
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* Demonstrates on-chip flash read/write using the flash driver
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* (flash.h / flash.c). A string is written to the last sector of flash
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* and then read back to verify. The result is printed over UART.
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*
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* Wiring:
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* No external wiring required
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*/
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#include <stdio.h>
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#include <string.h>
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#include "pico/stdlib.h"
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#include "flash.h"
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#define FLASH_TARGET_OFFSET (FLASH_DRIVER_SIZE_BYTES - FLASH_DRIVER_SECTOR_SIZE)
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#define FLASH_WRITE_LEN FLASH_DRIVER_PAGE_SIZE
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/**
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* @brief Fill a write buffer with 0xFF and copy the demo string into it
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*
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* @param buf Destination buffer
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* @param buf_size Size of the buffer in bytes
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*/
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static void _prepare_write_buf(uint8_t *buf, size_t buf_size) {
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memset(buf, 0xFF, buf_size);
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const char *msg = "Embedded Hacking flash driver demo";
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memcpy(buf, msg, strlen(msg) + 1);
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}
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/**
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* @brief Write the demo string to flash and print the read-back result
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*/
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static void _write_and_verify(void) {
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static uint8_t write_buf[FLASH_WRITE_LEN];
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static uint8_t read_buf[FLASH_WRITE_LEN];
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_prepare_write_buf(write_buf, sizeof(write_buf));
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flash_driver_write(FLASH_TARGET_OFFSET, write_buf, FLASH_WRITE_LEN);
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flash_driver_read(FLASH_TARGET_OFFSET, read_buf, FLASH_WRITE_LEN);
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printf("Flash readback: %s\r\n", read_buf);
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}
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/**
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* @brief Application entry point for the on-chip flash demo
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*
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* Writes a demo string to the last flash sector, reads it back,
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* and prints the result over UART.
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*
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* @return int Does not return
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*/
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int main(void) {
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stdio_init_all();
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_write_and_verify();
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while (true)
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tight_loop_contents();
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}
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