Moved action to top level.

Removed old iterations of the project and moved the files from 02-usart
to the root directory since that's the sole place where the action is
and that subproject has outgrown its initial title.

1 files changed, 29 insertions, 0 deletions

diff --git a/src/kern/main.c b/src/kern/main.c
new file mode 100644
index 0000000..ebb2164
--- /dev/null
+++ b/src/kern/main.c
@@ -0,0 +1,29 @@
+#include "arch.h"
+#include "kern/log.h"
+
+#include "arch/stm32l4xxx/peripherals/system.h"
+#include "arch/stm32l4xxx/peripherals/clock.h"
+
+void on_systick() /* Overrides weak-symbol on_systick. */
+{
+  klogf("Systick\n");
+}
+
+#ifdef ARCH_STM32L4
+
+/* Main function. This gets executed from the interrupt vector defined above. */
+int main()
+{
+  klogf("Hello, World! Clock Mhz: %d\n", (uint32_t) get_clock_mhz());
+
+  /* Set the countdown to start from 10,000,0000. */
+  SCB.strv_r = 10000000;
+
+  /* Enable interrupts. */
+  regset(SCB.stcs_r, scb_tickint, 1);
+
+  /* Start the systick. */
+  regset(SCB.stcs_r, scb_enable, 1);
+}
+
+#endif