[stm32f429i-discovery] Replaced the ctrl-c handler in console for a shorter version.

Thanks to ChuckM for that.

examples/stm32/f4/stm32f429i-discovery/lcd-serial/console.c

@@ -67,11 +67,13 @@ void usart1_isr(void)
 		if (reg & USART_SR_RXNE) {
 			recv_buf[recv_ndx_nxt] = USART_DR(CONSOLE_UART);
 #ifdef RESET_ON_CTRLC
-			/* Check for "reset" */
+			/*
+			 * This bit of code will jump to the ResetHandler if you
+			 * hit ^C
+			 */
 			if (recv_buf[recv_ndx_nxt] == '\003') {
-				/* reset the system */
 				scb_reset_system();
-				return; /* not reached */
+				return; /* never actually reached */
 			}
 #endif
 			/* Check for "overrun" */

examples/stm32/f4/stm32f429i-discovery/sdram/console.c

@@ -79,16 +79,13 @@ void usart1_isr(void)
 		if (reg & USART_SR_RXNE) {
 			recv_buf[recv_ndx_nxt] = USART_DR(CONSOLE_UART);
 #ifdef RESET_ON_CTRLC
-			/* Check for "reset" */
+			/*
+			 * This bit of code will jump to the ResetHandler if you
+			 * hit ^C
+			 */
 			if (recv_buf[recv_ndx_nxt] == '\003') {
-				/* reset the system */
+				scb_reset_system();
-				/* Return address on stack */
+				return; /* never actually reached */
-				volatile uint32_t *ret = (&reg) + 7;
-
-				/* force system reset */
-				*ret = (uint32_t) &reset_handler;
-				/* go to new address */
-				return;
 			}
 #endif
 			/* Check for "overrun" */

examples/stm32/f4/stm32f429i-discovery/spi/console.c

@@ -67,26 +67,13 @@ void usart1_isr(void)
 		if (reg & USART_SR_RXNE) {
 			recv_buf[recv_ndx_nxt] = USART_DR(CONSOLE_UART);
 #ifdef RESET_ON_CTRLC
-			/* Check for "reset" */
+			/*
+			 * This bit of code will jump to the ResetHandler if you
+			 * hit ^C
+			 */
 			if (recv_buf[recv_ndx_nxt] == '\003') {
-				/* reset the system volatile definition of
+				scb_reset_system();
-				 * return address on the stack to insure it
+				return; /* never actually reached */
-				 * gets stored, changed to point to the
-				 * trampoline function (do_the_nasty) which is
-				 * required because we need to return of an
-				 * interrupt to get the internal value of the
-				 * LR register reset and put the processor back
-				 * into "Thread" mode from "Handler" mode.
-				 *
-				 * See the PM0214 Programming Manual for Cortex
-				 * M, pg 42, to see the format of the Cortex M4
-				 * stack after an interrupt or exception has
-				 * occurred.
-				 */
-				volatile uint32_t *ret = (&reg) + 7;
-
-				*ret = (uint32_t) &reset_handler;
-				return;
 			}
 #endif
 			/* Check for "overrun" */