rename examples

2024-04-23 16:23:41 +01:00
parent e581daec90
commit a8d630293b
11 changed files with 0 additions and 0 deletions
@@ -0,0 +1,27 @@
+#include <stdint.h>
+
+#pragma GCC diagnostic ignored "-Wprio-ctor-dtor"
+__attribute__((constructor(0))) static void setup_qingke() {
+    asm volatile(
+        // Undocumented "Configure pipelining and instruction prediction"
+        "li t0, 0x1f\n"
+        "csrw 0xbc0, t0\n"
+    );
+}
+
+#define R32_RCC_APB2PCENR   (*(volatile uint32_t*)0x40021018)
+#define R32_GPIOA_CFGLR     (*(volatile uint32_t*)0x40010800)
+#define R32_GPIOA_BSHR      (*(volatile uint32_t*)0x40010810)
+
+int main(void) {
+    R32_RCC_APB2PCENR |= 1 << 2;
+    R32_GPIOA_CFGLR = (R32_GPIOA_CFGLR & ~0xf) | (0b0010 << 0);
+    while (1) {
+        R32_GPIOA_BSHR = 1 << 0;
+        for (int i = 0; i < 250000; i++)
+            asm volatile("");
+        R32_GPIOA_BSHR = 1 << 16;
+        for (int i = 0; i < 250000; i++)
+            asm volatile("");
+    }
+}