Initial Release

flash/program/CMakeLists.txt

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+add_executable(flash_program
+        flash_program.c
+        )
+
+target_link_libraries(flash_program
+        pico_stdlib
+        hardware_flash
+        )
+
+# create map/bin/hex file etc.
+pico_add_extra_outputs(flash_program)
+
+# add url via pico_set_program_url
+example_auto_set_url(flash_program)

flash/program/flash_program.c

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+/**
+ * Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "pico/stdlib.h"
+#include "hardware/flash.h"
+
+// We're going to erase and reprogram a region 256k from the start of flash.
+// Once done, we can access this at XIP_BASE + 256k.
+#define FLASH_TARGET_OFFSET (256 * 1024)
+
+const uint8_t *flash_target_contents = (const uint8_t *) (XIP_BASE + FLASH_TARGET_OFFSET);
+
+void print_buf(const uint8_t *buf, size_t len) {
+    for (size_t i = 0; i < len; ++i) {
+        printf("%02x", buf[i]);
+        if (i % 16 == 15)
+            printf("\n");
+        else
+            printf(" ");
+    }
+}
+
+int main() {
+    stdio_init_all();
+    uint8_t random_data[FLASH_PAGE_SIZE];
+    for (int i = 0; i < FLASH_PAGE_SIZE; ++i)
+        random_data[i] = rand() >> 16;
+
+    printf("Generated random data:\n");
+    print_buf(random_data, FLASH_PAGE_SIZE);
+
+    // Note that a whole number of sectors must be erased at a time.
+    printf("\nErasing target region...\n");
+    flash_range_erase(FLASH_TARGET_OFFSET, FLASH_SECTOR_SIZE);
+    printf("Done. Read back target region:\n");
+    print_buf(flash_target_contents, FLASH_PAGE_SIZE);
+
+    printf("\nProgramming target region...\n");
+    flash_range_program(FLASH_TARGET_OFFSET, random_data, FLASH_PAGE_SIZE);
+    printf("Done. Read back target region:\n");
+    print_buf(flash_target_contents, FLASH_PAGE_SIZE);
+
+    bool mismatch = false;
+    for (int i = 0; i < FLASH_PAGE_SIZE; ++i) {
+        if (random_data[i] != flash_target_contents[i])
+            mismatch = true;
+    }
+    if (mismatch)
+        printf("Programming failed!\n");
+    else
+        printf("Programming successful!\n");
+}