TIM2: time base for scheduler with [0.5ms] resolution

- TickChk with [1ms] resolution
- 1ms period is not possible at 80MHz with 16 bit counter, only 0.5ms

Core/Src/main.c

@@ -51,6 +51,7 @@ void SystemClock_Config(void);
 static void MX_GPIO_Init(void);
 static void MX_ICACHE_Init(void);
 static void MX_TIM5_Init(void);
+static void MX_TIM2_Init(void);
 /* USER CODE BEGIN PFP */
 
 /* USER CODE END PFP */
@@ -61,6 +62,22 @@ static inline void LD2_On()     { LL_GPIO_SetOutputPin( LD2_GPIO_Port, LD2_Pin);
 static inline void LD2_Off()    { LL_GPIO_ResetOutputPin( LD2_GPIO_Port, LD2_Pin); }
 static inline void LD2_Toggle() { LL_GPIO_TogglePin(LD2_GPIO_Port, LD2_Pin); }
 
+/***************************************************************************//**
+ * @brief Check if specified time interval has elapsed
+ * @param tref Pointer to time reference variable [ms]
+ * @param tcycle Time interval in milliseconds
+ *//****************************************************************************/
+static inline uint32_t TickChk(uint32_t *tref, int_fast16_t tcycle) {
+   uint32_t t = LL_TIM_GetCounter(TIM2) / 2;    // 2kHz/2=1kHz
+   int32_t tdif = t - *tref;
+   if (tdif >= tcycle) {
+      *tref += tcycle;
+      return 1;
+   }
+   return 0;
+}
+
+
 
 /* USER CODE END 0 */
 
@@ -100,7 +117,10 @@ int main(void)
   MX_GPIO_Init();
   MX_ICACHE_Init();
   MX_TIM5_Init();
+  MX_TIM2_Init();
   /* USER CODE BEGIN 2 */
+  LL_TIM_GenerateEvent_UPDATE(TIM2);
+  LL_TIM_EnableCounter(TIM2);
   LL_TIM_GenerateEvent_UPDATE(TIM5);
   LL_TIM_EnableCounter(TIM5);
 
@@ -118,15 +138,27 @@ int main(void)
   /* USER CODE BEGIN WHILE */
    while (1)
    {
+      static uint32_t Tick10msRef = 0;
+      if (TickChk(&Tick10msRef, 10)) {  // execute every 10ms
+         ShiftReg_Update();
+      }
+
+      static uint32_t Tick1secRef = 0;
+      if (TickChk(&Tick1secRef, 1000)) {  // execute every 1s
          LD2_Toggle();
-      Delay_us(1000000);   // 1s delay
          static uint8_t cnt = 0;
          DispPutDigit(0, '0'+cnt, 0);
          DispPutDigit(1, 'a'+cnt, 1);
          DispPutDigit(2, 'A'+cnt, 0);
-      DispPutDigit(3, 'Z'-cnt, 1);
+         cnt = (cnt + 1) % 16;
-      if (++cnt > 9) cnt = 0;
+      }
-      ShiftReg_Update();
+
+      static uint32_t Tick100msRef = 0;
+      if (TickChk(&Tick100msRef, 100)) {  // execute every 100ms
+         static uint8_t dot = 0;
+         dot ^= 1;   // toggle dot
+         DispPutDigit(3, ' ', dot);
+      }
          /* USER CODE END WHILE */
 
     /* USER CODE BEGIN 3 */
@@ -214,6 +246,41 @@ static void MX_ICACHE_Init(void)
 
 }
 
+/**
+  * @brief TIM2 Initialization Function
+  * @param None
+  * @retval None
+  */
+static void MX_TIM2_Init(void)
+{
+
+  /* USER CODE BEGIN TIM2_Init 0 */
+
+  /* USER CODE END TIM2_Init 0 */
+
+  LL_TIM_InitTypeDef TIM_InitStruct = {0};
+
+  /* Peripheral clock enable */
+  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_TIM2);
+
+  /* USER CODE BEGIN TIM2_Init 1 */
+
+  /* USER CODE END TIM2_Init 1 */
+  TIM_InitStruct.Prescaler = 39999;
+  TIM_InitStruct.CounterMode = LL_TIM_COUNTERMODE_UP;
+  TIM_InitStruct.Autoreload = 4294967295;
+  TIM_InitStruct.ClockDivision = LL_TIM_CLOCKDIVISION_DIV1;
+  LL_TIM_Init(TIM2, &TIM_InitStruct);
+  LL_TIM_DisableARRPreload(TIM2);
+  LL_TIM_SetClockSource(TIM2, LL_TIM_CLOCKSOURCE_INTERNAL);
+  LL_TIM_SetTriggerOutput(TIM2, LL_TIM_TRGO_RESET);
+  LL_TIM_DisableMasterSlaveMode(TIM2);
+  /* USER CODE BEGIN TIM2_Init 2 */
+
+  /* USER CODE END TIM2_Init 2 */
+
+}
+
 /**
   * @brief TIM5 Initialization Function
   * @param None

DigitalAudioH533.ioc

@@ -46,6 +46,7 @@ Mcu.ContextProject=TrustZoneDisabled
 Mcu.Family=STM32H5
 Mcu.IP0=BOOTPATH
 Mcu.IP1=CORTEX_M33_NS
+Mcu.IP10=TIM5
 Mcu.IP2=DEBUG
 Mcu.IP3=ICACHE
 Mcu.IP4=MEMORYMAP
@@ -53,8 +54,8 @@ Mcu.IP5=NVIC
 Mcu.IP6=PWR
 Mcu.IP7=RCC
 Mcu.IP8=SYS
-Mcu.IP9=TIM5
+Mcu.IP9=TIM2
-Mcu.IPNb=10
+Mcu.IPNb=11
 Mcu.Name=STM32H533RETx
 Mcu.Package=LQFP64
 Mcu.Pin0=PC14-OSC32_IN(OSC32_IN)
@@ -62,9 +63,10 @@ Mcu.Pin1=PC15-OSC32_OUT(OSC32_OUT)
 Mcu.Pin10=VP_PWR_VS_SECSignals
 Mcu.Pin11=VP_PWR_VS_LPOM
 Mcu.Pin12=VP_SYS_VS_Systick
-Mcu.Pin13=VP_TIM5_VS_ClockSourceINT
+Mcu.Pin13=VP_TIM2_VS_ClockSourceINT
-Mcu.Pin14=VP_BOOTPATH_VS_BOOTPATH
+Mcu.Pin14=VP_TIM5_VS_ClockSourceINT
-Mcu.Pin15=VP_MEMORYMAP_VS_MEMORYMAP
+Mcu.Pin15=VP_BOOTPATH_VS_BOOTPATH
+Mcu.Pin16=VP_MEMORYMAP_VS_MEMORYMAP
 Mcu.Pin2=PH0-OSC_IN(PH0)
 Mcu.Pin3=PH1-OSC_OUT(PH1)
 Mcu.Pin4=PA13(JTMS/SWDIO)
@@ -73,7 +75,7 @@ Mcu.Pin6=PC11
 Mcu.Pin7=PB8
 Mcu.Pin8=VP_CORTEX_M33_NS_VS_Hclk
 Mcu.Pin9=VP_ICACHE_VS_ICACHE
-Mcu.PinsNb=16
+Mcu.PinsNb=17
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32H533RETx
@@ -155,7 +157,7 @@ ProjectManager.ToolChainLocation=
 ProjectManager.UAScriptAfterPath=
 ProjectManager.UAScriptBeforePath=
 ProjectManager.UnderRoot=true
-ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-LL-false,2-MX_GPIO_Init-GPIO-false-LL-true,3-MX_ICACHE_Init-ICACHE-false-LL-true,4-MX_TIM5_Init-TIM5-false-LL-true,0-MX_CORTEX_M33_NS_Init-CORTEX_M33_NS-false-LL-true,0-MX_PWR_Init-PWR-false-LL-true
+ProjectManager.functionlistsort=1-SystemClock_Config-RCC-false-LL-false,2-MX_GPIO_Init-GPIO-false-LL-true,3-MX_ICACHE_Init-ICACHE-false-LL-true,4-MX_TIM5_Init-TIM5-false-LL-true,5-MX_TIM2_Init-TIM2-false-LL-true,0-MX_CORTEX_M33_NS_Init-CORTEX_M33_NS-false-LL-true,0-MX_PWR_Init-PWR-false-LL-true
 RCC.ADCFreq_Value=80000000
 RCC.AHBFreq_Value=80000000
 RCC.APB1Freq_Value=80000000
@@ -231,6 +233,8 @@ RCC.VCOInputFreq_Value=16000000
 RCC.VCOOutputFreq_Value=320000000
 RCC.VCOPLL2OutputFreq_Value=160000000
 RCC.VCOPLL3OutputFreq_Value=64000000
+TIM2.IPParameters=Prescaler
+TIM2.Prescaler=39999
 TIM5.IPParameters=Prescaler
 TIM5.Prescaler=79
 VP_BOOTPATH_VS_BOOTPATH.Mode=BP_Activate
@@ -247,6 +251,8 @@ VP_PWR_VS_SECSignals.Mode=Security/Privilege
 VP_PWR_VS_SECSignals.Signal=PWR_VS_SECSignals
 VP_SYS_VS_Systick.Mode=SysTick
 VP_SYS_VS_Systick.Signal=SYS_VS_Systick
+VP_TIM2_VS_ClockSourceINT.Mode=Internal
+VP_TIM2_VS_ClockSourceINT.Signal=TIM2_VS_ClockSourceINT
 VP_TIM5_VS_ClockSourceINT.Mode=Internal
 VP_TIM5_VS_ClockSourceINT.Signal=TIM5_VS_ClockSourceINT
 board=custom