mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-05-16 21:23:33 +02:00
Kevin Thomas
85 lines
2.7 KiB
C
85 lines
2.7 KiB
C
/**
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* @file main.c
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* @brief On-chip flash write / read demonstration.
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* @author Kevin Thomas
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* @date 2026
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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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* MIT License
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*
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* Copyright (c) 2026 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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#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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/** @brief Flash offset for the target storage sector */
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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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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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