chore: ld

src/main.c

@@ -0,0 +1,31 @@
+#include <stdint.h>
+
+extern uint32_t DiagPrintf(const char *fmt, ...)
+    __attribute__((format(printf, 1, 2)));
+#define printf DiagPrintf
+
+// GPIO direction register @ 0x1004 (from GPIO_Direction: 12 * port + 0x40000000
+// + 0x1000 + 4) For interrupt control: 0x1030: Interrupt enable register
+// 0x1038: Interrupt trigger type
+// 0x103C: Interrupt polarity
+// 0x1048: Interrupt debounce
+
+#define PERIPH_BASE 0x40000000
+// 12 * port_number(0) + PERIPH_BASE + 0x1000
+#define PORT_A_BASE (PERIPH_BASE + 0x1000)
+
+#define GPIOA_DIR (*(volatile uint32_t *)(PORT_A_BASE + 0x4))
+#define GPIOA (*(volatile uint32_t *)(PORT_A_BASE + 0x0))
+
+int main(void) {
+  printf("hello from main\n");
+  // while (1) {
+  //     __asm("nop");
+  // }
+
+  GPIOA_DIR |= (1 << 0);
+  while (1) {
+    GPIOA ^= (1 << 0);
+    for (volatile int i = 0; i < 100000; i++);
+  }
+}