Diff: main.cpp

Revision:

5:88b6ced3df89

Parent:

4:00ccc80cbeb8

Child:

6:2f7ee2af27f9

diff -r 00ccc80cbeb8 -r 88b6ced3df89 main.cpp
--- a/main.cpp	Sun Aug 14 09:57:58 2016 +0000
+++ b/main.cpp	Mon Aug 29 01:30:30 2016 +0000
@@ -1,19 +1,65 @@
 #include "stm32f103c8t6.h"
 #include "mbed.h"
-#include "USBSerial.h"
+#include "USBDFU.h"
+
+/*
+ * This is an example program demonstrating a USB DFU runtime combined with
+ * a USB DFU bootloader that does not require an offset.
+ * 
+ * It normally blinks an LED at 1Hz, but when it receives a DFU detach
+ * request over USB (eg, by running "dfu-util -d 1234:0006 -e"), it
+ * blinks 3 times rapidly and resets into the bootloader.
+ *
+ * New programs can be uploaded by running
+ * dfu-util -d 1234:0006,1209:db42 -D your_firmware.bin
+ *
+ */
 
 DigitalOut  myled(LED1);
 
+bool detached = false;
+void onDetachRequested() {
+    detached = true;
+}
+
+void resetIntoBootloader() {
+    // Turn on write access to the backup registers
+    __PWR_CLK_ENABLE();
+    HAL_PWR_EnableBkUpAccess();
+    
+    // Write the magic value to force the bootloader to run
+    BKP->DR2 = 0x544F;
+    BKP->DR1 = 0x4F42;
+    
+    HAL_PWR_DisableBkUpAccess();
+    
+    // Reset and let the bootloader run
+    NVIC_SystemReset();
+}
+
 int main() {
     confSysClock();     //Configure system clock (72MHz HSE clock, 48MHz USB clock)
     
-    Serial    pc(PA_2, PA_3);
-    USBSerial usbSerial;
+    USBDFU usbDFU(0x1234, 0x0006, 0x0001, false);
+    usbDFU.attach(onDetachRequested);
     
     while(1) {
+        // Check the DFU status
+        if (!usbDFU.configured()) {
+            usbDFU.connect(false);
+        }
+        if (detached) {
+            for (int i=0; i < 5; i++) {
+                myled = 1;
+                wait_ms(100);
+                myled = 0;
+                wait_ms(100);
+            }
+            resetIntoBootloader();
+        }
+        
+        // Do normal stuff
         myled = !myled;
-        pc.printf("I am a serial port\r\n");            // 9600 bit/s
-        usbSerial.printf("I am a USB serial port\r\n"); // 12 Mbit/s (USB full-speed)
         wait_ms(1000);
     }
 }