introduce new feature: BOOTLOADER_ALWAYSENTERPROGRAMMODE

Enabling "BOOTLOADER_ALWAYSENTERPROGRAMMODE" ignores bootLoaderCondition()
(BUT NOT bootLoaderConditionSimple()) and always enter the program-mode.

This is helpful to emulate behaviour of Arduino bootloaders

Use "-DCONFIG_HAVE__BOOTLOADER_ALWAYSENTERPROGRAMMODE" within
DEFINES variable of Makefile.inc to enable this feature.

Otherwise default is off.

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>

diff --git a/firmware/bootloaderconfig.h b/firmware/bootloaderconfig.h
index 072aa81..88a24fe 100644 (file)
--- a/firmware/bootloaderconfig.h
+++ b/firmware/bootloaderconfig.h
@@ -347,6 +347,14 @@ these macros are defined, the boot loader usees them.
  * exit as long as bootLoaderConditionSimple stays on.
  */
 
+#ifdef CONFIG_HAVE__BOOTLOADER_ALWAYSENTERPROGRAMMODE
+#endif
+/*
+ * Ignore bootLoaderCondition() (BUT NOT bootLoaderConditionSimple())
+ * and always enter the program-mode.
+ * This is helpful to emulate behaviour of Arduino bootloaders
+ */
+
 //#define SIGNATURE_BYTES             0x1e, 0x93, 0x07, 0     /* ATMega8 */
 /* This macro defines the signature bytes returned by the emulated USBasp to
  * the programmer software. They should match the actual device at least in
@@ -412,6 +420,9 @@ static inline void  bootLoaderExit(void)
 static volatile uint8_t __BOOTLOADERENTRY_FROMSOFTWARE__bootup_RAMEND_doesmatch __attribute__ ((section(".noinit")));
 static volatile uint8_t __BOOTLOADERENTRY_FROMSOFTWARE__bootup_MCUCSR __attribute__ ((section(".noinit")));
 
+#      ifdef CONFIG_HAVE__BOOTLOADER_ALWAYSENTERPROGRAMMODE
+#              define bootLoaderCondition()    (true)
+#      else
 static inline bool bootLoaderCondition(void)
 {
   if (__BOOTLOADERENTRY_FROMSOFTWARE__bootup_MCUCSR & (~(_BV(WDRF)))) {
@@ -423,8 +434,13 @@ static inline bool bootLoaderCondition(void)
   }
   return bootLoaderConditionSimple();
 }
+#      endif
 #else
-#define bootLoaderCondition            bootLoaderConditionSimple
+#      ifdef CONFIG_HAVE__BOOTLOADER_ALWAYSENTERPROGRAMMODE
+#              define bootLoaderCondition()    (true)
+#      else
+#              define bootLoaderCondition      bootLoaderConditionSimple
+#      endif
 #endif
 
 #endif /* __ASSEMBLER__ */