USART3 enabled with RS485 DE

- 115200 baud
- Rx: PB1
- Tx: PB10
- DE: PB14

Core/Src/main.c

@@ -58,6 +58,7 @@ static void MX_ICACHE_Init(void);
 static void MX_TIM5_Init(void);
 static void MX_TIM2_Init(void);
 static void MX_UART5_Init(void);
+static void MX_USART3_UART_Init(void);
 /* USER CODE BEGIN PFP */
 
 /* USER CODE END PFP */
@@ -140,6 +141,7 @@ int main(void)
   MX_TIM5_Init();
   MX_TIM2_Init();
   MX_UART5_Init();
+  MX_USART3_UART_Init();
   /* USER CODE BEGIN 2 */
   LL_TIM_GenerateEvent_UPDATE(TIM2);
   LL_TIM_EnableCounter(TIM2);
@@ -172,7 +174,6 @@ int main(void)
       if (TickChk(&Tick1secRef, 1000)) {  // execute every 1s
          LD2_Toggle();
          static uint8_t cnt = 0;
-         DispPutDigit(1, 'a'+cnt, 1);
          DispPutDigit(2, 'A'+cnt, 0);
          cnt = (cnt + 1) % 16;
          static uint32_t Trefus = 0;
@@ -180,6 +181,7 @@ int main(void)
          uint32_t tdif = t - Trefus;
          printf("%6luus\n", tdif);
          Trefus = t;
+         LL_USART_TransmitData8(USART3, 'A' + cnt);  // direct send without buffer and interrupt
       }
 
       static uint32_t Tick100msRef = 0;
@@ -189,6 +191,11 @@ int main(void)
          DispPutDigit(3, ' ', dot);
       }
 
+      if (LL_USART_IsActiveFlag_RXNE_RXFNE(USART3)) {  // check if data received
+         char rxch = LL_USART_ReceiveData8(USART3);  // direct receive without buffer and interrupt
+         DispPutDigit(1, rxch, 1);
+      }
+
       int16_t ch = Uart5_GetByte();
       if (ch != -1) {  // if data received
          char c = ch;
@@ -441,6 +448,68 @@ static void MX_UART5_Init(void)
 
 }
 
+/**
+  * @brief USART3 Initialization Function
+  * @param None
+  * @retval None
+  */
+static void MX_USART3_UART_Init(void)
+{
+
+  /* USER CODE BEGIN USART3_Init 0 */
+
+  /* USER CODE END USART3_Init 0 */
+
+  LL_USART_InitTypeDef USART_InitStruct = {0};
+
+  LL_GPIO_InitTypeDef GPIO_InitStruct = {0};
+
+  LL_RCC_SetUSARTClockSource(LL_RCC_USART3_CLKSOURCE_PCLK1);
+
+  /* Peripheral clock enable */
+  LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_USART3);
+
+  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
+  /**USART3 GPIO Configuration
+  PB1   ------> USART3_RX
+  PB10   ------> USART3_TX
+  PB14   ------> USART3_DE
+  */
+  GPIO_InitStruct.Pin = LL_GPIO_PIN_1|LL_GPIO_PIN_10|LL_GPIO_PIN_14;
+  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
+  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_HIGH;
+  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
+  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
+  GPIO_InitStruct.Alternate = LL_GPIO_AF_7;
+  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+  /* USER CODE BEGIN USART3_Init 1 */
+
+  /* USER CODE END USART3_Init 1 */
+  USART_InitStruct.PrescalerValue = LL_USART_PRESCALER_DIV1;
+  USART_InitStruct.BaudRate = 115200;
+  USART_InitStruct.DataWidth = LL_USART_DATAWIDTH_8B;
+  USART_InitStruct.StopBits = LL_USART_STOPBITS_1;
+  USART_InitStruct.Parity = LL_USART_PARITY_NONE;
+  USART_InitStruct.TransferDirection = LL_USART_DIRECTION_TX_RX;
+  USART_InitStruct.HardwareFlowControl = LL_USART_HWCONTROL_NONE;
+  USART_InitStruct.OverSampling = LL_USART_OVERSAMPLING_16;
+  LL_USART_Init(USART3, &USART_InitStruct);
+  LL_USART_SetTXFIFOThreshold(USART3, LL_USART_FIFOTHRESHOLD_1_8);
+  LL_USART_SetRXFIFOThreshold(USART3, LL_USART_FIFOTHRESHOLD_1_8);
+  LL_USART_EnableDEMode(USART3);
+  LL_USART_SetDESignalPolarity(USART3, LL_USART_DE_POLARITY_HIGH);
+  LL_USART_SetDEAssertionTime(USART3, 0);
+  LL_USART_SetDEDeassertionTime(USART3, 0);
+  LL_USART_DisableFIFO(USART3);
+  LL_USART_ConfigAsyncMode(USART3);
+  LL_USART_Enable(USART3);
+  /* USER CODE BEGIN USART3_Init 2 */
+
+  /* USER CODE END USART3_Init 2 */
+
+}
+
 /**
   * @brief GPIO Initialization Function
   * @param None
@@ -456,9 +525,9 @@ static void MX_GPIO_Init(void)
   /* GPIO Ports Clock Enable */
   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOC);
   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOH);
+  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOA);
   LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOD);
-  LL_AHB2_GRP1_EnableClock(LL_AHB2_GRP1_PERIPH_GPIOB);
 
   /**/
   LL_GPIO_ResetOutputPin(GPIOC, SHR_CLK_Pin|SHR_STR_Pin);

DigitalAudioH533.ioc

@@ -48,6 +48,7 @@ Mcu.IP0=BOOTPATH
 Mcu.IP1=CORTEX_M33_NS
 Mcu.IP10=TIM5
 Mcu.IP11=UART5
+Mcu.IP12=USART3
 Mcu.IP2=DEBUG
 Mcu.IP3=ICACHE
 Mcu.IP4=MEMORYMAP
@@ -56,29 +57,32 @@ Mcu.IP6=PWR
 Mcu.IP7=RCC
 Mcu.IP8=SYS
 Mcu.IP9=TIM2
-Mcu.IPNb=12
+Mcu.IPNb=13
 Mcu.Name=STM32H533RETx
 Mcu.Package=LQFP64
 Mcu.Pin0=PC14-OSC32_IN(OSC32_IN)
 Mcu.Pin1=PC15-OSC32_OUT(OSC32_OUT)
-Mcu.Pin10=VP_CORTEX_M33_NS_VS_Hclk
-Mcu.Pin11=VP_ICACHE_VS_ICACHE
-Mcu.Pin12=VP_PWR_VS_SECSignals
-Mcu.Pin13=VP_PWR_VS_LPOM
-Mcu.Pin14=VP_SYS_VS_Systick
-Mcu.Pin15=VP_TIM2_VS_ClockSourceINT
-Mcu.Pin16=VP_TIM5_VS_ClockSourceINT
-Mcu.Pin17=VP_BOOTPATH_VS_BOOTPATH
-Mcu.Pin18=VP_MEMORYMAP_VS_MEMORYMAP
+Mcu.Pin10=PC12
+Mcu.Pin11=PD2
+Mcu.Pin12=PB8
+Mcu.Pin13=VP_CORTEX_M33_NS_VS_Hclk
+Mcu.Pin14=VP_ICACHE_VS_ICACHE
+Mcu.Pin15=VP_PWR_VS_SECSignals
+Mcu.Pin16=VP_PWR_VS_LPOM
+Mcu.Pin17=VP_SYS_VS_Systick
+Mcu.Pin18=VP_TIM2_VS_ClockSourceINT
+Mcu.Pin19=VP_TIM5_VS_ClockSourceINT
 Mcu.Pin2=PH0-OSC_IN(PH0)
+Mcu.Pin20=VP_BOOTPATH_VS_BOOTPATH
+Mcu.Pin21=VP_MEMORYMAP_VS_MEMORYMAP
 Mcu.Pin3=PH1-OSC_OUT(PH1)
-Mcu.Pin4=PA13(JTMS/SWDIO)
-Mcu.Pin5=PA14(JTCK/SWCLK)
-Mcu.Pin6=PC11
-Mcu.Pin7=PC12
-Mcu.Pin8=PD2
-Mcu.Pin9=PB8
-Mcu.PinsNb=19
+Mcu.Pin4=PB1
+Mcu.Pin5=PB10
+Mcu.Pin6=PB14
+Mcu.Pin7=PA13(JTMS/SWDIO)
+Mcu.Pin8=PA14(JTCK/SWCLK)
+Mcu.Pin9=PC11
+Mcu.PinsNb=22
 Mcu.ThirdPartyNb=0
 Mcu.UserConstants=
 Mcu.UserName=STM32H533RETx
@@ -100,6 +104,19 @@ PA13(JTMS/SWDIO).Mode=Serial_Wire
 PA13(JTMS/SWDIO).Signal=DEBUG_JTMS-SWDIO
 PA14(JTCK/SWCLK).Mode=Serial_Wire
 PA14(JTCK/SWCLK).Signal=DEBUG_JTCK-SWCLK
+PB1.GPIOParameters=GPIO_Speed
+PB1.GPIO_Speed=GPIO_SPEED_FREQ_HIGH
+PB1.Locked=true
+PB1.Mode=Asynchronous
+PB1.Signal=USART3_RX
+PB10.GPIOParameters=GPIO_Speed
+PB10.GPIO_Speed=GPIO_SPEED_FREQ_HIGH
+PB10.Mode=Asynchronous
+PB10.Signal=USART3_TX
+PB14.GPIOParameters=GPIO_Speed
+PB14.GPIO_Speed=GPIO_SPEED_FREQ_HIGH
+PB14.Mode=Hardware Flow Control (RS485)
+PB14.Signal=USART3_DE
 PB8.GPIOParameters=GPIO_Label
 PB8.GPIO_Label=SHR_DOUT_DISP
 PB8.Locked=true
@@ -112,13 +129,15 @@ PC11.Signal=GPIO_Output
 PC12.Locked=true
 PC12.Mode=Asynchronous
 PC12.Signal=UART5_TX
-PC14-OSC32_IN(OSC32_IN).GPIOParameters=GPIO_Label
+PC14-OSC32_IN(OSC32_IN).GPIOParameters=GPIO_Label,PinAttribute
 PC14-OSC32_IN(OSC32_IN).GPIO_Label=SHR_CLK
 PC14-OSC32_IN(OSC32_IN).Locked=true
+PC14-OSC32_IN(OSC32_IN).PinAttribute=Free
 PC14-OSC32_IN(OSC32_IN).Signal=GPIO_Output
-PC15-OSC32_OUT(OSC32_OUT).GPIOParameters=GPIO_Label
+PC15-OSC32_OUT(OSC32_OUT).GPIOParameters=GPIO_Label,PinAttribute
 PC15-OSC32_OUT(OSC32_OUT).GPIO_Label=SHR_STR
 PC15-OSC32_OUT(OSC32_OUT).Locked=true
+PC15-OSC32_OUT(OSC32_OUT).PinAttribute=Free
 PC15-OSC32_OUT(OSC32_OUT).Signal=GPIO_Output
 PCC.Checker=false
 PCC.Line=STM32H5x3
@@ -167,7 +186,7 @@ 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,5-MX_TIM2_Init-TIM2-false-LL-true,6-MX_UART5_Init-UART5-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,6-MX_UART5_Init-UART5-false-LL-true,7-MX_USART3_UART_Init-USART3-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
@@ -249,6 +268,11 @@ TIM2.IPParameters=Prescaler
 TIM2.Prescaler=39999
 TIM5.IPParameters=Prescaler
 TIM5.Prescaler=79
+USART3.BaudRate=115200
+USART3.IPParameters=VirtualMode-Asynchronous,VirtualMode-Hardware Flow Control (RS485),BaudRate,OverSampling
+USART3.OverSampling=UART_OVERSAMPLING_16
+USART3.VirtualMode-Asynchronous=VM_ASYNC
+USART3.VirtualMode-Hardware\ Flow\ Control\ (RS485)=VM_ASYNC
 VP_BOOTPATH_VS_BOOTPATH.Mode=BP_Activate
 VP_BOOTPATH_VS_BOOTPATH.Signal=BOOTPATH_VS_BOOTPATH
 VP_CORTEX_M33_NS_VS_Hclk.Mode=Hclk_Mode