Merge pull request #18 from ARMmbed/add-spifblockdevice

Add SPIFBlockDevice example

Author: Cruz Monrreal

SPIFBlockDevice/README.md

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+# SPIFBlockDevice example
+
+SPIFBlockDevice usage example for Mbed OS
+

SPIFBlockDevice/main.cpp

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+#include "mbed.h"
+#include "SPIFBlockDevice.h"
+
+// Create flash device on SPI bus with PTE5 as chip select
+SPIFBlockDevice spif(PTE2, PTE4, PTE1, PTE5);
+
+int main() {
+    printf("spif test\n");
+
+    // Initialize the SPI flash device, and print the memory layout
+    spif.init();
+    printf("spif size: %llu\n",         spif.size());
+    printf("spif read size: %llu\n",    spif.get_read_size());
+    printf("spif program size: %llu\n", spif.get_program_size());
+    printf("spif erase size: %llu\n",   spif.get_erase_size());
+
+    // Write "Hello World!" to the first block
+    char *buffer = (char*)malloc(spif.get_erase_size());
+    sprintf(buffer, "Hello World!\n");
+    spif.erase(0, spif.get_erase_size());
+    spif.program(buffer, 0, spif.get_erase_size());
+
+    // Read back what was stored
+    spif.read(buffer, 0, spif.get_erase_size());
+    printf("%s", buffer);
+
+    // Deinitialize the device
+    spif.deinit();
+}

SPIFBlockDevice/mbed-os.lib

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+https://github.com/ARMmbed/mbed-os/#c966348d3f9ca80843be7cdc9b748f06ea73ced0