mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-28 18:21:32 +02:00
Kevin Thomas
79 lines
2.2 KiB
C
79 lines
2.2 KiB
C
/**
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******************************************************************************
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* @file main.c
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* @author Kevin Thomas
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* @brief On-chip flash write / read demonstration.
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*
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* Writes "Embedded Hacking flash driver demo" to the last
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* sector of flash, reads it back via XIP, and prints the
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* result over UART.
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*
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* Wiring:
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* GPIO0 -> UART TX (USB-to-UART adapter RX)
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* GPIO1 -> UART RX (USB-to-UART adapter TX)
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* No external components required
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*
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******************************************************************************
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* @attention
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*
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* Copyright (c) 2026 Kevin Thomas.
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* All rights reserved.
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*
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* This software is licensed under terms that can be found in the LICENSE file
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* in the root directory of this software component.
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* If no LICENSE file comes with this software, it is provided AS-IS.
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*
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******************************************************************************
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*/
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#include "rp2350_flash.h"
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#include "rp2350_uart.h"
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/**
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* @brief Target offset: last sector of the 4 MB flash chip.
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*/
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#define FLASH_TARGET_OFFSET (FLASH_SIZE - FLASH_SECTOR_SIZE)
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/**
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* @brief Fill a page buffer with 0xFF and copy the demo string.
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* @param buf destination buffer (FLASH_PAGE_SIZE bytes in RAM)
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* @retval None
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*/
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static void _prepare_write_buf(uint8_t *buf)
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{
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uint32_t i;
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const char *msg = "Embedded Hacking flash driver demo";
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for (i = 0; i < FLASH_PAGE_SIZE; i++)
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buf[i] = 0xFFU;
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for (i = 0; msg[i] != '\0'; i++)
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buf[i] = (uint8_t)msg[i];
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buf[i] = 0x00U;
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}
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/**
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* @brief Write the demo string to flash and print the read-back.
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* @retval None
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*/
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static void _write_and_verify(void)
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{
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uint8_t write_buf[FLASH_PAGE_SIZE];
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uint8_t read_buf[FLASH_PAGE_SIZE];
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_prepare_write_buf(write_buf);
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flash_write(FLASH_TARGET_OFFSET, write_buf, FLASH_PAGE_SIZE);
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flash_read(FLASH_TARGET_OFFSET, read_buf, FLASH_PAGE_SIZE);
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uart_puts("Flash readback: ");
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uart_puts((const char *)read_buf);
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uart_puts("\r\n");
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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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* @retval int does not return
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*/
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int main(void)
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{
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_write_and_verify();
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while (1)
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__asm volatile ("wfi");
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}
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