X-Git-Url: http://git.linex4red.de/pub/USBaspLoader.git/blobdiff_plain/46cd9d4a9468b30ee8e456eadee7aed61e6830c1..a3d7386c66be4c2479a15ebfa60eb733c0005dbc:/firmware/main.c

diff --git a/firmware/main.c b/firmware/main.c
index 8114dda..98703f9 100644
--- a/firmware/main.c
+++ b/firmware/main.c
@@ -112,8 +112,25 @@ typedef union longConverter{
 }longConverter_t;
 
 
-#if BOOTLOADER_CAN_EXIT
-static volatile unsigned char	stayinloader = 0xfe;
+#if (BOOTLOADER_CAN_EXIT)
+#	if (BOOTLOADER_LOOPCYCLES_TIMEOUT)
+#		if (BOOTLOADER_LOOPCYCLES_TIMEOUT < 256)
+#			if ((HAVE_UNPRECISEWAIT))
+volatile register uint8_t timeout_remaining __asm__("r2");
+#			else
+static volatile uint8_t timeout_remaining;
+#			endif
+#		else
+static volatile uint16_t timeout_remaining;
+#		endif
+#	endif
+#	if ((HAVE_UNPRECISEWAIT))
+/* here we have to assume we need to optimize for every byte */
+#define __REGISTER_stayinloader_initialValue 0xfe
+volatile register uint8_t stayinloader __asm__("r17");
+#	else
+static volatile uint8_t stayinloader = 0xfe;
+#	endif
 #endif
 
 static longConverter_t  	currentAddress; /* in bytes */
@@ -196,6 +213,18 @@ static const uchar  signatureBytes[4] = {
 
 /* ------------------------------------------------------------------------ */
 
+#if (__REGISTER_stayinloader_initialValue)
+/* need to put it after libc init - otherwise it fucks up the register */
+void __attribute__ ((section(".init8"),naked,used,no_instrument_function)) __REGISTER_stayinloader_initialValue_INITIALIZATION(void);
+void __REGISTER_stayinloader_initialValue_INITIALIZATION(void) {
+  asm volatile (
+    "ldi	%[silreg]	,	%[silval]\n\t"
+    : [silreg]		"=a" (stayinloader)
+    : [silval]		"M"  (__REGISTER_stayinloader_initialValue)
+  );
+}
+#endif
+
 #if (HAVE_BOOTLOADERENTRY_FROMSOFTWARE)
 void __attribute__ ((section(".init3"),naked,used,no_instrument_function)) __BOOTLOADERENTRY_FROMSOFTWARE__bootup_investigate_RAMEND(void);
 void __BOOTLOADERENTRY_FROMSOFTWARE__bootup_investigate_RAMEND(void) {
@@ -407,7 +436,7 @@ defined (__AVR_ATmega2561__)
 #   endif
       }
 #endif
-#if (HAVE_BOOTLOADER_HIDDENEXITCOMMAND)
+#if ((HAVE_BOOTLOADER_HIDDENEXITCOMMAND) && (BOOTLOADER_CAN_EXIT))
 #	if ((HAVE_BOOTLOADER_HIDDENEXITCOMMAND != 0xac) && \
 	    (HAVE_BOOTLOADER_HIDDENEXITCOMMAND != 0x20) && (HAVE_BOOTLOADER_HIDDENEXITCOMMAND != 0x28) && \
 	    (HAVE_BOOTLOADER_HIDDENEXITCOMMAND != 0x40) && (HAVE_BOOTLOADER_HIDDENEXITCOMMAND != 0x48) && \
@@ -464,7 +493,12 @@ static uchar    replyBuffer[4];
     }else if(rq->bRequest == USBASP_FUNC_DISCONNECT){
 
 #if BOOTLOADER_CAN_EXIT
+#	if (BOOTLOADER_LOOPCYCLES_TIMEOUT)
+      timeout_remaining = BOOTLOADER_LOOPCYCLES_TIMEOUT;
+      stayinloader	    = (0xfe);
+#	else
       stayinloader	   &= (0xfe);
+#	endif
 #endif
     }else{
         /* ignore: others, but could be USBASP_FUNC_CONNECT */
@@ -703,6 +737,10 @@ static void initForUsbConnectivity(void)
 
 int __attribute__((__noreturn__)) main(void)
 {
+#if ((BOOTLOADER_LOOPCYCLES_TIMEOUT) && (BOOTLOADER_CAN_EXIT))
+    uint16_t __loopscycles;
+    timeout_remaining = BOOTLOADER_LOOPCYCLES_TIMEOUT;
+#endif
     /* initialize  */
     bootLoaderInit();
     odDebugInit();
@@ -727,6 +765,13 @@ int __attribute__((__noreturn__)) main(void)
 	MCUCSR = 0;       /* clear all reset flags for next time */
         initForUsbConnectivity();
         do{
+#if ((BOOTLOADER_LOOPCYCLES_TIMEOUT) && (BOOTLOADER_CAN_EXIT))
+	__loopscycles++;
+	if (!(__loopscycles)) {
+	  if(timeout_remaining)	timeout_remaining--;
+	  else			stayinloader&=0xf1;
+	}
+#endif
             usbPoll();
 #if BOOTLOADER_CAN_EXIT
 #if USE_EXCESSIVE_ASSEMBLER