From: Michel Pollet <buserror@gmail.com>
Date: Tue, 16 Jun 2015 18:05:21 +0000 (+0100)
Subject: avr: Add a 'reset pc' that can be nonzero
X-Git-Tag: v1.3~25
X-Git-Url: https://git.htl-mechatronik.at/public/?a=commitdiff_plain;h=a865759ce131dd4829e77416a9f08c008f85aa0c;p=sx%2Fsimavr.git

avr: Add a 'reset pc' that can be nonzero

This allows the AVR to soft reset into the bootloader for example.

A watchdog reset will re-run the bootloader with the correct flag.

Signed-off-by: Michel Pollet <buserror@gmail.com>
---

diff --git a/simavr/sim/sim_avr.c b/simavr/sim/sim_avr.c
index 549e36d..6744242 100644
--- a/simavr/sim/sim_avr.c
+++ b/simavr/sim/sim_avr.c
@@ -125,7 +125,7 @@ void avr_reset(avr_t * avr)
 	for(int i = 0x20; i < noof_ios; i++)
 		avr->data[i] = 0;
 	_avr_sp_set(avr, avr->ramend);
-	avr->pc = 0;
+	avr->pc = avr->reset_pc;	// Likely to be zero
 	for (int i = 0; i < 8; i++)
 		avr->sreg[i] = 0;
 	avr_interrupt_reset(avr);
diff --git a/simavr/sim/sim_avr.h b/simavr/sim/sim_avr.h
index aad19b5..038b893 100644
--- a/simavr/sim/sim_avr.h
+++ b/simavr/sim/sim_avr.h
@@ -232,6 +232,11 @@ typedef struct avr_t {
 	 * It CAN be a little confusing, so concentrate, young grasshopper.
 	 */
 	avr_flashaddr_t	pc;
+	/*
+	 * Reset PC, this is the value used to jump to at reset time, this
+	 * allow support for bootloaders
+	 */
+	avr_flashaddr_t	reset_pc;
 
 	/*
 	 * callback when specific IO registers are read/written.