added lptimer

src/main.c

@@ -14,10 +14,12 @@
 I2C_HandleTypeDef hi2c1;
 EXTI_HandleTypeDef hexti1;
 EXTI_ConfigTypeDef cexti1;
+LPTIM_HandleTypeDef LPTIMConf = {0};
 uint8_t transmit[1025];
 
 volatile uint8_t charge = 0; // if device is charging, = 1
 volatile uint8_t standby = 0; // if device is on charger, but charging complete, = 1
+volatile uint8_t lptim_ovf = 0; //0 if the lptimer has not overflowed (finished counting), 1 if so
 
 void APP_ErrorHandler(void)
 {
@@ -107,6 +109,7 @@ static void APP_SystemClockConfig(void) // Setup HSI as 4MHz
 {
   RCC_OscInitTypeDef RCC_OscInitStruct = {0};
   RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+  RCC_PeriphCLKInitTypeDef LPTIM_RCC = {0};
 
   /* Oscillator Configuration */
   RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_LSI | RCC_OSCILLATORTYPE_LSE; /* Select oscillators HSE, HSI, LSI, LSE */
@@ -115,7 +118,7 @@ static void APP_SystemClockConfig(void) // Setup HSI as 4MHz
   RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_8MHz;  /* Configure HSI clock as 8MHz */
   RCC_OscInitStruct.HSEState = RCC_HSE_OFF;                         /* Disable HSE */
   /*RCC_OscInitStruct.HSEFreq = RCC_HSE_16_32MHz;*/
-  RCC_OscInitStruct.LSIState = RCC_LSI_OFF;                         /* Disable LSI */
+  RCC_OscInitStruct.LSIState = RCC_LSI_ON;                         // Enable LSI for low power timer
   RCC_OscInitStruct.LSEState = RCC_LSE_OFF;                         /* Disable LSE */
   /*RCC_OscInitStruct.LSEDriver = RCC_LSEDRIVE_MEDIUM;*/
   RCC_OscInitStruct.PLL.PLLState = RCC_PLL_OFF;                     /* Disable PLL */
@@ -136,6 +139,68 @@ static void APP_SystemClockConfig(void) // Setup HSI as 4MHz
   {
     APP_ErrorHandler();
   }
+
+  /* LPTIM clock configuration */
+  LPTIM_RCC.PeriphClockSelection = RCC_PERIPHCLK_LPTIM;     /* Select peripheral clock: LPTIM */
+  LPTIM_RCC.LptimClockSelection = RCC_LPTIMCLKSOURCE_LSI;   /* Select LPTIM clock source: LSI */
+  /* Peripheral clock initialization */
+  if (HAL_RCCEx_PeriphCLKConfig(&LPTIM_RCC) != HAL_OK)
+  {
+    APP_ErrorHandler();
+  }
+  
+  // Enable LPTIM clock
+  __HAL_RCC_LPTIM_CLK_ENABLE();
+
+    __HAL_RCC_PWR_CLK_ENABLE(); // Enable the Power System Clock
+}
+
+static void LPTIMInit(void)
+{
+  /* LPTIM configuration */
+  LPTIMConf.Instance = LPTIM;                         /* LPTIM */
+  LPTIMConf.Init.Prescaler = LPTIM_PRESCALER_DIV128;  /* Prescaler: 128 */
+  LPTIMConf.Init.UpdateMode = LPTIM_UPDATE_IMMEDIATE; /* Immediate update mode */
+  /* Initialize LPTIM */
+  if (HAL_LPTIM_Init(&LPTIMConf) != HAL_OK)
+  {
+    APP_ErrorHandler();
+  }
+}
+
+static void LPTIMStart(uint32_t count)
+{
+    // Restart lpTimer
+    __HAL_LPTIM_DISABLE(&LPTIMConf);
+    HAL_Delay(1);
+    // Enable autoreload interrupt
+    __HAL_LPTIM_ENABLE_IT(&LPTIMConf, LPTIM_IT_ARRM);
+    // Enable LPTIM
+    __HAL_LPTIM_ENABLE(&LPTIMConf);
+    // Load autoreload value
+    __HAL_LPTIM_AUTORELOAD_SET(&LPTIMConf, count);
+    HAL_Delay(1);
+    // Start single count mode
+    __HAL_LPTIM_START_SINGLE(&LPTIMConf);
+}
+
+void LPTIM_Delay(uint32_t millis){
+    float counts = millis * 0.256f; // With the understanding the prescaler is 128
+    LPTIMStart((uint32_t)(counts + 0.5f));
+    HAL_SuspendTick();    
+    // Enter STOP mode
+    do{
+        HAL_PWR_EnterSTOPMode(PWR_LOWPOWERREGULATOR_ON, PWR_STOPENTRY_WFI); 
+    } while (lptim_ovf == 0);
+    // After waking up
+    HAL_ResumeTick();
+    APP_SystemClockConfig(); // Must reconfig the clock after waking up
+    lptim_ovf = 0; // Reset global flag
+}
+
+void HAL_LPTIM_AutoReloadMatchCallback(LPTIM_HandleTypeDef *hlptim)
+{
+    lptim_ovf = 1;
 }
 
 void GPIO_Charger_EXTI_Init(void){
@@ -316,11 +381,13 @@ void Display_UNL_Info(){
     displayArray(flag, 2, 20, 0, 35);
     displayArray(pointers, 2, 8, 1, 17);
     ssd1306_bitmap((const uint8_t *)dept);
-    HAL_Delay(3000);
+    //HAL_Delay(3000);
+    LPTIM_Delay(3000);
     displayArray(flag, 2, 20, 0, 35);
     displayArray(pointers, 2, 8, 1, 17);
     ssd1306_bitmap((const uint8_t *)dept);
-    HAL_Delay(3000);
+    //HAL_Delay(3000);
+    LPTIM_Delay(3000);
 }
 
 void Sleep(){
@@ -348,12 +415,13 @@ int main (void)
     // Add check for charging after deivce died (interrupt missed)
     HAL_Init();
     APP_SystemClockConfig();
+    LPTIMInit();
     display_Switch_Init(); // for new hw version
     display_Power_On();
     GPIO_Charger_EXTI_Init();
     GPIO_I2C_Init(); 
     I2C_Init();
-    Accel_Init();
+    //Accel_Init();
     EXTI_Init();
     LED_Init();
     ssd1306_init();
@@ -363,6 +431,6 @@ int main (void)
       // Add more frames here
     
 
-      Sleep();
+      //Sleep();
     }
 }
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