From b8100ea5042013bb4eed67907b4e9d4e5c196df2 Mon Sep 17 00:00:00 2001
From: Keith Packard <keithp@keithp.com>
Date: Fri, 16 Mar 2012 20:23:31 -0700
Subject: [PATCH] Add stm bringup timers and move most of the setup code to the
 stm dir

Signed-off-by: Keith Packard <keithp@keithp.com>
---
 src/stm-bringup/Makefile  | 33 ++++++++++++++---------
 src/stm-bringup/bringup.c | 56 ++++++++++++++++++++++++---------------
 2 files changed, 55 insertions(+), 34 deletions(-)

diff --git a/src/stm-bringup/Makefile b/src/stm-bringup/Makefile
index 49966a4f..1ba480ba 100644
--- a/src/stm-bringup/Makefile
+++ b/src/stm-bringup/Makefile
@@ -1,34 +1,41 @@
+vpath % ..:../core:../product:../drivers:../stm
+vpath ao-make-product.5c ../util
+
+ifndef VERSION
+include ../Version
+endif
+
 CC=arm-none-eabi-gcc
 OBJCOPY=arm-none-eabi-objcopy
 
-C_LIB=/local/src/pdclib/pdclib.a
-C_INC=-I/local/src/pdclib/includes -I/local/src/pdclib/internals
+PDCLIB=/home/keithp/sat
+C_LIB=$(PDCLIB)/lib/pdclib.a
+C_INC=-I$(PDCLIB)/include
 
-DEF_CFLAGS=-g -std=gnu99 -O0 -mlittle-endian -mthumb -ffreestanding -nostdlib -I../../src/stm $(C_INC)
+DEF_CFLAGS=-g -std=gnu99 -Os -mlittle-endian -mthumb -ffreestanding -nostdlib -I../../src/stm $(C_INC)
 
 # to run from SRAM
-LD_FLAGS_RAM=-Wl,-Taltos-ram.ld
-LD_FLAGS=-Wl,-Taltos.ld
+LD_FLAGS_RAM=-L../stm -Wl,-Taltos-ram.ld
+LD_FLAGS=-L../stm -Wl,-Taltos.ld
 
 CFLAGS=$(DEF_CFLAGS) -mcpu=cortex-m3 -DCONFIG_STM32L_DISCOVERY
 
-OBJS=bringup.o
+SRC=bringup.c ao_interrupt.c
+OBJ=$(SRC:.c=.o)
 
 all: bringup-ram.elf bringup.elf
 
 %.bin: %.elf
 	$(OBJCOPY) -O binary $^ $@
 
-bringup.elf: $(OBJS) $(C_LIB) altos.ld
-	$(CC) $(CFLAGS) $(LD_FLAGS) -o $@ $(OBJS) $(C_LIB) -lgcc
-
-bringup-ram.elf: $(OBJS) $(C_LIB) altos-ram.ld
-	$(CC) $(CFLAGS) $(LD_FLAGS_RAM) -o $@ $(OBJS) $(C_LIB) -lgcc
+bringup.elf: $(OBJ) $(C_LIB) altos.ld
+	$(CC) $(CFLAGS) $(LD_FLAGS) -o $@ $(OBJ) $(C_LIB) -lgcc
 
-bringup.o: bringup.c
-	$(CC) -c $(CFLAGS) bringup.c
+bringup-ram.elf: $(OBJ) $(C_LIB) altos-ram.ld
+	$(CC) $(CFLAGS) $(LD_FLAGS_RAM) -o $@ $(OBJ) $(C_LIB) -lgcc
 
 clean:
+	rm -f *.o
 	rm -rf *.elf
 	rm -rf *.bin
 
diff --git a/src/stm-bringup/bringup.c b/src/stm-bringup/bringup.c
index b6fe458d..c5fad4a3 100644
--- a/src/stm-bringup/bringup.c
+++ b/src/stm-bringup/bringup.c
@@ -250,13 +250,46 @@ serial_string(char *string)
 		outbyte(c);
 }
 
+volatile uint16_t	tick_count;
+
+void
+stm_tim6_isr(void)
+{
+	if (stm_tim6.sr & (1 << STM_TIM67_SR_UIF)) {
+		stm_tim6.sr = 0;
+		++tick_count;
+	}
+}
+
+#define TIMER_10kHz	(STM_APB1 / 10000)
+
 void
 set_timer6(void)
 {
+	stm_nvic_set_enable(STM_ISR_TIM6_POS);
+	stm_nvic_set_priority(STM_ISR_TIM6_POS, 1);
+
 	/* Turn on timer 6 */
 	stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_TIM6EN);
 
-	
+	stm_tim6.psc = TIMER_10kHz;
+	stm_tim6.arr = 100;
+	stm_tim6.cnt = 0;
+
+	/* Enable update interrupt */
+	stm_tim6.dier = (1 << STM_TIM67_DIER_UIE);
+
+	/* Poke timer to reload values */
+	stm_tim6.egr |= (1 << STM_TIM67_EGR_UG);
+
+	stm_tim6.cr2 = (STM_TIM67_CR2_MMS_RESET << STM_TIM67_CR2_MMS);
+
+	/* And turn it on */
+	stm_tim6.cr1 = ((0 << STM_TIM67_CR1_ARPE) |
+			(0 << STM_TIM67_CR1_OPM) |
+			(1 << STM_TIM67_CR1_URS) |
+			(0 << STM_TIM67_CR1_UDIS) |
+			(1 << STM_TIM67_CR1_CEN));
 }
 
 void
@@ -273,7 +306,7 @@ main (void)
 		printf ("hello, ");
 		delay();
 		stm_gpiob.odr = (1 << 6);
-		printf ("world\n");
+		printf ("world %d\n", tick_count);
 		delay();
 	}
 }
@@ -285,22 +318,3 @@ delay(void)
 	for (i = 0; i < 1000000; i++)
 		__asm__ __volatile__ ("nop\n\t":::"memory");
 }
-
-static int x = 7;
-
-extern char __stack__;
-extern char __text_start__, __text_end__;
-extern char __data_start__, __data_end__;
-extern char __bss_start__, __bss_end__;
-
-void start(void) {
-	memcpy(&__data_start__, &__text_end__, &__data_end__ - &__data_start__);
-	memset(&__bss_start__, '\0', &__bss_end__ - &__bss_start__);
-	main();
-}
-
-__attribute__ ((section(".interrupt")))
-static const void *interrupt[] = {
-	&__stack__,
-	start,
-};
-- 
2.30.2