1 files changed, 45 insertions, 0 deletions
diff --git a/laser-tag software/lptmr.c b/laser-tag software/lptmr.c
new file mode 100644
index 0000000..8fa7ad9
--- /dev/null
+++ b/laser-tag software/lptmr.c
@@ -0,0 +1,45 @@
+#include "lptmr.h"
+
+static const lptmr_user_config_t g_lptmrConfig = {
+    .timerMode = kLptmrTimerModeTimeCounter,
+    .freeRunningEnable = false,
+    .prescalerEnable = false,
+    .prescalerClockSource = kClockLptmrSrcLpoClk,
+    .isInterruptEnabled = true,
+};
+
+static lptmr_state_t lptmrState;
+static lptmr_callback_t user_cb;
+static uint32_t total_ms;
+
+static void lptmr_call_back(void)
+{
+  total_ms += 100;
+  user_cb();
+}
+
+uint32_t get_ms() {
+  uint32_t us = LPTMR_DRV_GetCurrentTimeUs(LPTMR0_IDX);
+  return total_ms + us / 1000;
+}
+
+void delay_ms(uint32_t delay)
+{
+  uint32_t until = get_ms() + delay;
+  while(get_ms() < until);
+}
+
+void lptmr_init(lptmr_callback_t cb)
+{
+    LPTMR_DRV_Init(LPTMR0_IDX, &lptmrState, &g_lptmrConfig);
+    LPTMR_DRV_SetTimerPeriodUs(LPTMR0_IDX, 100000);
+    user_cb = cb;
+    total_ms = 0;
+    LPTMR_DRV_InstallCallback(LPTMR0_IDX, lptmr_call_back);
+}
+
+void lptmr_start()
+{
+  LPTMR_DRV_Start(LPTMR0_IDX);
+}
+/* vim: set expandtab ts=4 sw=4: */