1 files changed, 63 insertions(+), 10 deletions(-)

M src/main.c

@@ 1,25 1,78 @@
 #include <stdint.h>
-#include "stm32h747xx.h"
+#include <stm32h747xx.h>
+#include <core_cm7.h>
 
 #define LED1_PIN 12
 #define LED2_PIN 13
 
+void led_toggle()
+{
+  GPIOI->ODR ^= (1 << LED1_PIN);
+}
+
+void led_input()
+{
+  GPIOI->MODER = (1 << LED1_PIN*2);
+}
+
+void led_gpio_en()
+{
+  RCC->AHB4ENR |= (1 << RCC_AHB4ENR_GPIOIEN_Pos);
+  volatile uint32_t dummy;
+  dummy = RCC->AHB4ENR;
+  dummy = RCC->AHB4ENR;
+}
+
+void exti15_10_handler(void)
+{
+  if (EXTI->PR1 & EXTI_PR1_PR13) {
+    led_toggle();
+    EXTI->PR1 &= EXTI_PR1_PR13;
+  }
+}
+
 void main()
 {
- RCC->AHB4ENR |= (1 << RCC_AHB4ENR_GPIOIEN_Pos);
+  led_gpio_en();
+  led_input();
+  led_toggle();
 
-  // do two dummy reads after enabling the peripheral clock
+  RCC->APB4ENR |= RCC_APB4ENR_SYSCFGEN;
   volatile uint32_t dummy;
+  dummy = RCC->APB4ENR;
+  dummy = RCC->APB4ENR;
+
+  RCC->AHB4ENR |= (1 << RCC_AHB4ENR_GPIOCEN_Pos);
   dummy = RCC->AHB4ENR;
   dummy = RCC->AHB4ENR;
 
-  GPIOI->MODER = (1 << GPIO_MODER_MODE12_Pos) | (1 << GPIO_MODER_MODE13_Pos);
+  // pc13 input
+  GPIOC->MODER &= ~((0x3) << (13*2));
+
+  SYSCFG->EXTICR[3] |= (SYSCFG_EXTICR4_EXTI13_PC);
+  EXTI->RTSR1 |= EXTI_RTSR1_TR13;
+  EXTI->FTSR1 &= ~(EXTI_FTSR1_TR13);
+  EXTI->IMR1 |= EXTI_IMR1_IM13;
 
-  GPIOI->ODR ^= (1 << LED2_PIN);
-  while(1)
-  {
-    GPIOI->ODR ^= (1 << LED1_PIN);
-    GPIOI->ODR ^= (1 << LED2_PIN);
-    for (uint32_t i = 0; i < 2000000; i++);
+  NVIC_SetPriority(EXTI15_10_IRQn, 2);
+  NVIC_EnableIRQ(EXTI15_10_IRQn);
+  /* NVIC->IPR[EXTI15_10_IRQn] |= 2 << (8U - __NVIC_PRIO_BITS); */
+  /* NVIC->ISER[(((uint32_t)EXTI15_10_IRQn) >> 5UL)] = (1 << (EXTI15_10_IRQn & 0x1FUL)); */
+
+  __enable_irq();
+
+  while(1) {
+    int toggle = (GPIOC->IDR >> 13) & 1;
+
+    if (toggle) {
+      led_toggle();
+      while(1) {}
+    }
   }
+  /* void* usb_otg = usb_device_init(USB_OTG_ADDR); */
+  /* usb_device_setup(usb_otg); */
+
+  /* usb_device_wait_for_handshake(usb_otg); */
+
+  /* // do two dummy reads after enabling the peripheral clock */
 }