DFU: put Chip Unique ID into USB serial number string

usb-dfu-experiment/Makefile

@@ -120,17 +120,15 @@ VPATH += $(UTILITY)
 VPATH += $(PERIPH)/dbgu
 VPATH += $(PERIPH)/pio
 VPATH += $(PERIPH)/irq
-VPATH += $(PERIPH)/ssc
-VPATH += $(PERIPH)/twi
 VPATH += $(PERIPH)/pmc
 VPATH += $(PERIPH)/cp15
 VPATH += $(BOARDS)/$(BOARD)
 VPATH += $(BOARDS)/$(BOARD)/$(CHIP)
-VPATH += $(DRIVER)/twi
-VPATH += $(PERIPH)/mci
+VPATH += $(PERIPH)/eefc
 VPATH += $(PERIPH)/dma
 VPATH += $(DRIVER)/dmad
 VPATH += $(EXT_LIBS)/cmsis
+VPATH += $(AT91LIB)/memories/flash
 
 VPATH += $(USB)/device/core
 VPATH += $(USB)/device/dfu
@@ -140,6 +138,7 @@ VPATH += $(USB)/common/audio
 # Objects built from C source files
 C_OBJECTS += main.o
 C_OBJECTS += dfu_desc.o
+C_OBJECTS += sam3u_chipid_usbserial.o
 C_OBJECTS += USBD_UDPHS.o
 C_OBJECTS += USBDDriver.o
 C_OBJECTS += USBDCallbacks_Initialized.o
@@ -161,17 +160,15 @@ C_OBJECTS += dfu_driver.o
 C_OBJECTS += dbgu.o
 C_OBJECTS += pio.o
 C_OBJECTS += pio_it.o
-C_OBJECTS += ssc.o
-C_OBJECTS += twi.o
 C_OBJECTS += pmc.o
 C_OBJECTS += led.o
-C_OBJECTS += twid.o
 C_OBJECTS += string.o
 C_OBJECTS += stdio.o
 C_OBJECTS += math.o
 C_OBJECTS += trace.o
 C_OBJECTS += board_memories.o
 C_OBJECTS += board_lowlevel.o
+C_OBJECTS += flashd_eefc.o eefc.o
 
 
 # Objects for different chips
@@ -185,14 +182,6 @@ C_OBJECTS += aic.o
 C_OBJECTS += cp15.o
 endif
 
-ifeq ($(CHIP_IP_MCI), MCI_DMA)
-C_OBJECTS += dmad.o
-C_OBJECTS += dma.o
-C_OBJECTS += mci_hs.o
-else
-C_OBJECTS += mci.o
-endif
-
 # Objects built from Assembly source files
 ifneq ($(CHIP_CORE), cortexm3)
 ASM_OBJECTS += board_cstartup.o

usb-dfu-experiment/main.c

@@ -54,7 +54,6 @@
 
 #include <usb/device/core/USBD.h>
 #include <usb/device/core/USBDDriver.h>
-#include <usb/common/core/USBStringDescriptor.h>
 #include <usb/device/dfu/dfu.h>
 
 #include "dfu_desc.h"
@@ -260,28 +259,6 @@ void USBDCallbacks_Suspended(void)
     USBState = STATE_SUSPEND;
 }
 
-
-static int to_usb_string(char *out, int out_len, const char *in)
-{
-	int in_len = strlen(in);
-	int num_out = USBStringDescriptor_LENGTH(in_len);
-	int i;
-	char *cur = out;
-
-	if (num_out > out_len || num_out >= 255 || num_out < 0)
-		return -EINVAL;
-
-	*cur++ = num_out;
-	*cur++ = USBGenericDescriptor_STRING;
-
-	for (i = 0; i < in_len; i++) {
-		*cur++ = in[i];
-		*cur++ = 0;
-	}
-
-	return cur - out;
-}
-
 /* USBD callback */
 void USBDCallbacks_RequestReceived(const USBGenericRequest *request)
 {
@@ -315,6 +292,7 @@ int USBDFU_handle_dnload(uint8_t altif, unsigned int offset,
 			 uint8_t *buf, unsigned int len)
 {
 	TRACE_INFO("DFU: handle_dnload(%u, %u, %u)\n\r", altif, offset, len);
+
 	return DFU_RET_ZLP;
 }
 
@@ -324,7 +302,6 @@ void dfu_drv_updstatus(void)
 	TRACE_INFO("DFU: updstatus()\n\r");
 }
 
-
 /*----------------------------------------------------------------------------
  *         Exported functions
  *----------------------------------------------------------------------------*/
@@ -341,6 +318,8 @@ int main(void)
     printf("-- %s\n\r", BOARD_NAME);
     printf("-- Compiled: %s %s --\n\r", __DATE__, __TIME__);
 
+    chipid_to_usbserial();
+
     /* If they are present, configure Vbus & Wake-up pins */
     PIO_InitializeInterrupts(0);
 

usb-dfu-experiment/sam3u_chipid_usbserial.c

@@ -0,0 +1,64 @@
+#include <board.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+#include <memories/flash/flashd.h>
+
+#include <usb/common/core/USBStringDescriptor.h>
+
+#include <usb/device/dfu/dfu.h>
+
+/* 128bit binary serial, equals 16 bytes -> 32 hex digits */
+static uint8_t usb_serial_string[USBStringDescriptor_LENGTH(32)];
+
+/* convert from 7-bit ASCII to USB string */
+static int to_usb_string(char *out, int out_len, const char *in)
+{
+	int in_len = strlen(in);
+	int num_out = USBStringDescriptor_LENGTH(in_len);
+	int i;
+	char *cur = out;
+
+	if (num_out > out_len || num_out >= 255 || num_out < 0)
+		return -EINVAL;
+
+	*cur++ = num_out;
+	*cur++ = USBGenericDescriptor_STRING;
+
+	for (i = 0; i < in_len; i++) {
+		*cur++ = in[i];
+		*cur++ = 0;
+	}
+
+	return cur - out;
+}
+
+static int chip_uid_to_usbstring(void)
+{
+	unsigned long uniqueID[4];
+	int rc;
+
+	FLASHD_Initialize(0);
+	rc = FLASHD_ReadUniqueID(&uniqueID);
+	if (rc != 0)
+		return -EIO;
+
+	/* we skip the step to transform the unique-id into hex before
+	 * converting it into a USB string, as it seems to consist of ASCII
+	 * characters instead of a true 128 bit binary unique identifier */
+	rc = to_usb_string(usb_serial_string, sizeof(usb_serial_string), (char *) uniqueID);
+	if (rc > 0)
+		return 0;
+
+	return rc;
+}
+
+int chipid_to_usbserial(void)
+{
+	chip_uid_to_usbstring();
+	set_usb_serial_str(usb_serial_string);
+}