* Author: Christian Starkjohann
* Author: Stephan Baerwolf
* Creation Date: 2007-12-08
- * Modification Date: 2012-11-10
+ * Modification Date: 2013-03-31
* Tabsize: 4
* Copyright: (c) 2007 by OBJECTIVE DEVELOPMENT Software GmbH
* License: GNU GPL v2 (see License.txt)
- * This Revision: $Id: bootloaderconfig.h 729 2009-03-20 09:03:58Z cs $
*/
#ifndef __bootloaderconfig_h_included__
/* This is the port where the USB bus is connected. When you configure it to
* "B", the registers PORTB, PINB and DDRB will be used.
*/
+#ifndef USB_CFG_INTPORT_BIT
+ #if (defined(__AVR_ATmega640__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega1281__) || defined(__AVR_ATmega2560__) || defined(__AVR_ATmega2561__))
+ #define USB_CFG_INTPORT_BIT 0
+ #else
+ #define USB_CFG_INTPORT_BIT 2
+ #endif
+#endif
+/* Not all devices have their INT0 on PD2.
+ * Since "INT0" and "USB_CFG_DPLUS_BIT" should get the same signals,
+ * map them to be ideally the same:
+ * So abstract "USB_CFG_DPLUS_BIT" to this one here.
+ */
+
#ifndef USB_CFG_DMINUS_BIT
- #define USB_CFG_DMINUS_BIT 6 /* old value was 4 */
+ /* This is Revision 3 and later (where PD6 and PD7 were swapped */
+ #define USB_CFG_DMINUS_BIT 7 /* Rev.2 and previous was 6 */
#endif
/* This is the bit number in USB_CFG_IOPORT where the USB D- line is connected.
* This may be any bit in the port.
*/
#ifndef USB_CFG_DPLUS_BIT
- #define USB_CFG_DPLUS_BIT 2
+ #define USB_CFG_DPLUS_BIT USB_CFG_INTPORT_BIT
#endif
/* This is the bit number in USB_CFG_IOPORT where the USB D+ line is connected.
* This may be any bit in the port. Please note that D+ must also be connected
* jumper is connected to this port
*/
#ifndef JUMPER_BIT
- #define JUMPER_BIT 7 /* old value was 0 */
+ /* This is Revision 3 and later (where PD6 and PD7 were swapped */
+ #define JUMPER_BIT 6 /* Rev.2 and previous was 7 */
#endif
/*
* jumper is connected to this bit in port "JUMPER_PORT", active low
* (except registers and IO), since RESET will NOT clear old RAM content.
*/
+#ifdef CONFIG_NO__BOOTLOADERENTRY_FROMSOFTWARE
+# define HAVE_BOOTLOADERENTRY_FROMSOFTWARE 0
+#else
+# define HAVE_BOOTLOADERENTRY_FROMSOFTWARE 1
+#endif
+/*
+ * Enable firmware to boot the bootloader without
+ * user intervention
+ */
+
+#ifdef CONFIG_NO__BOOTLOADER_HIDDENEXITCOMMAND
+# define HAVE_BOOTLOADER_HIDDENEXITCOMMAND 0
+#else
+# define HAVE_BOOTLOADER_HIDDENEXITCOMMAND 0xff
+#endif
+/*
+ * When enabling "BOOTLOADER_HIDDENEXITCOMMAND", then
+ * sending the RAW-ISP command "0xff 0xXX 0xXX 0xXX"
+ * will cause the bootloader to start the firmware
+ * as soon as the programming software disconnects.
+ */
+
+#ifndef BOOTLOADER_LOOPCYCLES_TIMEOUT
+# define BOOTLOADER_LOOPCYCLES_TIMEOUT 0
+#endif
+/*
+ * When greater than "0", "BOOTLOADER_LOOPCYCLES_TIMEOUT"
+ * defines how many 16bit loopcycles can be cycled,
+ * before bootloader times out and starts user
+ * firmware.
+ * Of course "BOOTLOADER_CAN_EXIT" must be enabled.
+ * If value is even too small, bootloader will not
+ * exit as long as bootLoaderConditionSimple stays on.
+ */
+
//#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
// deactivated by Stephan - reset after each avrdude op is annoing!
// if(!(MCUCSR & (1 << EXTRF))) /* If this was not an external reset, ignore */
// leaveBootloader();
-
- MCUCSR = 0; /* clear all reset flags for next time */
}
static inline void bootLoaderExit(void)
PIN_PORT(JUMPER_PORT) = 0; /* undo bootLoaderInit() changes */
}
-#define bootLoaderCondition() ((PIN_PIN(JUMPER_PORT) & (1 << PIN(JUMPER_PORT, JUMPER_BIT))) == 0)
+
+#define bootLoaderConditionSimple() ((PIN_PIN(JUMPER_PORT) & (1 << PIN(JUMPER_PORT, JUMPER_BIT))) == 0)
+
+#if (HAVE_BOOTLOADERENTRY_FROMSOFTWARE)
+/*
+ * How it works: The idea
+ *
+ * During normal C initialization, the stackpointer (SP) always is pointed to
+ * SRAMs end, where it grows towards RAMSTART.
+ *
+ * Check if last possible pushed address in stack is bootloaders address.
+ * Store investigation result into "__BOOTLOADERENTRY_FROMSOFTWARE__bootup_RAMEND_doesmatch"
+ * Result will be "0xff" in case of mismatch.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define __BOOTLOADERENTRY_FROMSOFTWARE__EXPECTEDADDRESS (BOOTLOADER_ADDRESS>>1)
+static volatile uint8_t __BOOTLOADERENTRY_FROMSOFTWARE__bootup_RAMEND_doesmatch __attribute__ ((section(".noinit")));
+static volatile uint8_t __BOOTLOADERENTRY_FROMSOFTWARE__bootup_MCUCSR __attribute__ ((section(".noinit")));
+
+static inline bool bootLoaderCondition(void)
+{
+ if (__BOOTLOADERENTRY_FROMSOFTWARE__bootup_MCUCSR & (~(_BV(WDRF)))) {
+ } else {
+ if (__BOOTLOADERENTRY_FROMSOFTWARE__bootup_RAMEND_doesmatch == (__BOOTLOADERENTRY_FROMSOFTWARE__EXPECTEDADDRESS & 0xff)) {
+ // anything else: match - the firmware is calling the bootloader
+ return true;
+ }
+ }
+ return bootLoaderConditionSimple();
+}
+#else
+#define bootLoaderCondition bootLoaderConditionSimple
+#endif
#endif /* __ASSEMBLER__ */
projects / pub / USBaspLoader.git / blobdiff