Add STM self-flashing loader

[fw/altos] / src / stm / ao_interrupt.c

diff --git a/src/stm/ao_interrupt.c b/src/stm/ao_interrupt.c
index a423d8b13b1f76ad4ab2524602da956e8a74eadb..12763a305737623de75ad2c61757cbb9f445567e 100644 (file)
--- a/src/stm/ao_interrupt.c
+++ b/src/stm/ao_interrupt.c
@@ -36,7 +36,47 @@ void stm_ignore_isr(void)
 {
 }
 
+const void *stm_interrupt_vector[];
+
+#define BOOT_FETCH(o)  (*((uint32_t *) (AO_BOOT_APPLICATION_BASE + (o))))
+
+#ifdef AO_BOOT_APPLICATION_PIN
+#include <ao_exti.h>
+#endif
+
 void start(void) {
+#ifdef AO_BOOT_APPLICATION_PIN
+       uint16_t v;
+
+       /* Enable power interface clock */
+       stm_rcc.apb1enr |= (1 << STM_RCC_APB1ENR_PWREN);
+       
+       /* Enable the input pin */
+       ao_enable_input(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN,
+                       AO_BOOT_APPLICATION_MODE);
+
+       /* Read the value */
+       v = stm_gpio_get(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN);
+
+       /* Reset the chip to turn off the port and the power interface clock */
+       ao_gpio_set_mode(&AO_BOOT_APPLICATION_GPIO, AO_BOOT_APPLICATION_PIN, 0);
+       ao_disable_port(&AO_BOOT_APPLICATION_GPIO);
+       stm_rcc.apb1enr &= ~(1 << STM_RCC_APB1ENR_PWREN);
+       if (v == AO_BOOT_APPLICATION_VALUE)
+       {
+               uint32_t        sp;
+               uint32_t        pc;
+
+               sp = BOOT_FETCH(0);
+               pc = BOOT_FETCH(4);
+               asm ("mov sp, %0" : : "r" (sp));
+               asm ("mov lr, %0" : : "r" (pc));
+               asm ("bx lr");
+       }
+#endif
+
+       /* Set interrupt vector table offset */
+       stm_nvic.vto = (uint32_t) &stm_interrupt_vector;
        memcpy(&__data_start__, &__text_end__, &__data_end__ - &__data_start__);
        memset(&__bss_start__, '\0', &__bss_end__ - &__bss_start__);
        main();