Initial commit

Mieke/Tutorial/Listings/c.c

@@ -0,0 +1,77 @@
+#include <stm32f10x.h>
+
+void wait(void);
+void init_leds_switches(void);
+void set_leds(char value);
+char get_switches(void);
+void wait_ms(int ms);
+
+void init_leds_switches() {
+    int temp;
+
+    RCC->APB2ENR |= RCC_APB2ENR_IOPAEN;
+    RCC->APB2ENR |= RCC_APB2ENR_IOPBEN;
+
+    temp = GPIOA->CRL;
+    temp &= 0x00000000;
+    temp |= 0x88888888;
+    GPIOA->CRL = temp;
+    GPIOA->BSRR = 0x00FF;
+
+    temp = GPIOB->CRH;
+    temp &= 0x00000000;
+    temp |= 0x33333333;
+    GPIOB->CRH = temp;
+}
+
+void set_leds(char value) {
+    GPIOB->ODR =    (GPIOB->ODR & 0xFFFF00FF) |
+                    ((value & 0x000000FF) <<8);
+}
+
+char get_switches() {
+    return (GPIOA->IDR & 0x000000FF);
+}
+
+void wait_ms(int ms) {
+    int i,j;
+
+    for (i = 0; i < ms; i++) {
+        for (j = 0; j < 1595; j++);
+    }
+}
+
+void wait() {
+    unsigned char speed;
+    unsigned char i;
+
+    speed = get_switches();
+    speed = ~speed;
+    speed = speed & 0x7f;
+
+    for (i = 0; i <= speed; i++) {
+        wait_ms(100);
+    }
+}
+
+int main () {
+    char i;
+    char hs;
+    char lauflicht;
+
+    init_leds_switches();
+    hs = get_switches() & 0x80;
+    while (hs) {
+        lauflicht = 0x01;
+        i = 0;
+        while (i < 8) {
+            set_leds(lauflicht);
+            lauflicht = lauflicht << 1;
+            i++;
+            wait();
+        }
+        hs = get_switches() & 0x80;
+    }
+
+    while (1);
+}