mirror of
https://github.com/mytechnotalent/Embedded-Hacking.git
synced 2026-06-06 06:13:59 +02:00
Kevin Thomas
066c69f24b
Public function docstrings belong exclusively in .h headers per coding convention. Only static helper functions and static variables retain docstrings in .c files. Removed 413 duplicate docstrings across 185 files (15 CBM + 15 C SDK projects). All 30 projects rebuild with zero errors.
75 lines
2.1 KiB
C
75 lines
2.1 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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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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