1 files changed, 36 insertions, 0 deletions
diff --git a/01-system-clock/src/main.c b/01-system-clock/src/main.c
new file mode 100644
index 0000000..7912bf2
--- /dev/null
+++ b/01-system-clock/src/main.c
@@ -0,0 +1,36 @@
+#include "clock.h"
+#include "delay.h"
+#include "gpio.h"
+#include "spin.h"
+
+volatile uint32_t delay_amt = 20000000 / 4;
+
+/* Main function. This gets executed from the interrupt vector defined above. */
+int main()
+{
+  /* Enable the GPIO port B. */
+
+  __IO gpio_port_t* port_b = enable_gpio(GPIO_PORT_B);
+  gpio_output_pin_t pin3 = set_gpio_pin_output(port_b, PIN_3);
+  gpio_output_pin_t pin1 = set_gpio_pin_output(port_b, PIN_1);
+
+  /* Enable a higher clock frequency. */
+  set_system_clock_MHz(80);
+
+  uint32_t count = 0;
+  while (1) {
+    /* Set the GPIO pin to high. */
+    pin_off(pin1);
+    pin_off(pin3);
+    delay(delay_amt);
+
+    /* Set the GPIO pin to low. */
+    if (count % 4 == 0) {
+      pin_on(pin1);
+    }
+    pin_on(pin3);
+    delay(delay_amt);
+
+    ++count;
+  }
+}