QSPI example for default mode, read-write

Author: deepikabhavnani

QSPI/README.md

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+# QSPI example #
+
+QSPI driver usage example for mbed OS
+
+This is a example showing how to use mbed-OS QSPI driver to access a device interfaced over Quad-SPI
+The program does read/write operations on Flash memory connected over Quad-SPI interface using driver APIs in default QSPI mode.
+
+QSPI can be configured into different modes, based on underlying interface support. Refer to QSPI flash block device for more information (https://github.com/ARMmbed/qspif-blockdevice)

QSPI/main.cpp

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+#if !DEVICE_QSPI
+#error [NOT_SUPPORTED] QSPI not supported for this target
+#endif
+
+#include "mbed.h"
+#include "drivers/QSPI.h"
+
+#define CMD_WRITE 0x02
+#define CMD_READ  0x03
+#define ADDRESS   0x1000
+#define BUF_SIZE  10
+
+// hardware ssel (where applicable)
+QSPI qspi_device(QSPI_FLASH1_IO0, QSPI_FLASH1_IO1, QSPI_FLASH1_IO2, QSPI_FLASH1_IO3, QSPI_FLASH1_SCK, QSPI_FLASH1_CSN); // io0, io1, io2, io3, sclk, ssel
+
+int main() {
+    char tx_buf[] = { 'h', 'e', 'l', 'l', 'o', '\n' };
+    char rx_buf[BUF_SIZE];
+    size_t buf_len = sizeof(tx_buf);
+     qspi_status_t result;
+
+    result = qspi_device.configure_format(QSPI_CFG_BUS_SINGLE, QSPI_CFG_BUS_SINGLE,
+                                        QSPI_CFG_ADDR_SIZE_24, QSPI_CFG_BUS_SINGLE,
+                                        QSPI_CFG_ALT_SIZE_8, QSPI_CFG_BUS_SINGLE, 0);
+    if (result != QSPI_STATUS_OK) {
+        printf("Config format failed\n");
+    }
+
+    qspi_device.set_frequency(10000000);
+    result = qspi_device.write(CMD_WRITE, 0, ADDRESS, tx_buf, &buf_len);
+    if (result != QSPI_STATUS_OK) {
+        printf("Write failed\n");
+        return result;
+    }
+    printf("Write done: %s \n", tx_buf);
+
+    result = qspi_device.read(CMD_READ, 0, ADDRESS, rx_buf, &buf_len);
+    if (result != QSPI_STATUS_OK) {
+        printf("Read failed\n");
+        return result;
+    }
+    printf ("Data Read = %s\n", rx_buf);
+    return 0;
+}