Drivers

drivers/0x0f_flash/0x0f_flash.c

@@ -0,0 +1,65 @@
+/**
+ * @file 0x0f_flash.c
+ * @brief On-chip flash write/read demo using flash.c/flash.h
+ * @author Kevin Thomas
+ * @date 2025
+ *
+ * MIT License
+ *
+ * Copyright (c) 2025 Kevin Thomas
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * -----------------------------------------------------------------------------
+ *
+ * Demonstrates on-chip flash read/write using the flash driver
+ * (flash.h / flash.c). A string is written to the last sector of flash
+ * and then read back to verify. The result is printed over UART.
+ *
+ * Wiring:
+ *   No external wiring required
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "pico/stdlib.h"
+#include "flash.h"
+
+#define FLASH_TARGET_OFFSET (FLASH_DRIVER_SIZE_BYTES - FLASH_DRIVER_SECTOR_SIZE)
+#define FLASH_WRITE_LEN     FLASH_DRIVER_PAGE_SIZE
+
+int main(void) {
+    stdio_init_all();
+
+    static uint8_t write_buf[FLASH_WRITE_LEN];
+    static uint8_t read_buf[FLASH_WRITE_LEN];
+
+    memset(write_buf, 0xFF, sizeof(write_buf));
+    const char *msg = "Embedded Hacking flash driver demo";
+    memcpy(write_buf, msg, strlen(msg));
+
+    flash_driver_write(FLASH_TARGET_OFFSET, write_buf, FLASH_WRITE_LEN);
+    flash_driver_read(FLASH_TARGET_OFFSET, read_buf, FLASH_WRITE_LEN);
+
+    printf("Flash readback: %s\r\n", read_buf);
+
+    while (true) {
+        tight_loop_contents();
+    }
+}