Implemented UART communication (initial version). Needs more testing and make the buffer smaller to save space. RX and TX have been swapped in the system for debug (bad solder joint).

fw/Core/Src/main.c

@@ -47,8 +47,8 @@
  * Desired interrupt period 60s
  */
 const uint16_t tim21_prescaler = 60000-1; // 100Hz
-const uint16_t tim21_period = 12000-1; // 60s
+//const uint16_t tim21_period = 12000-1; // 60s
-//const uint16_t tim21_period = 1200-1; // 6s
+const uint16_t tim21_period = 1200-1; // 6s
 //const uint16_t tim21_period = 200-1; // 1s
 /* USER CODE END PV */
 
@@ -158,6 +158,11 @@ int main(void)
 	  if (lpuart1_rx_done == 1)
 	  {
 		  /* Process the message */
+		  uint8_t buff_pom[255];
+		  for (uint8_t j = 0; j < lpuart1_rx_message_len; j ++)
+		  {
+			  buff_pom[j] = lpuart1_rx_message[j];
+		  }
 		  /* process_modbus_message(lpuart1_rx_message, lpuart1_rx_message_len); */
 
 		  /* Reset the RX DONE flag */
@@ -193,6 +198,9 @@ int main(void)
 		  tim21_elapsed_period = 0;
 	  }
 	  /* TEST START */
+
+	  //LL_LPUART_TransmitData9(LPUART1, 0x69);
+	  //LL_mDelay(250);
 	  /* TODO: DELETE TEST */
 
 	  /* RS485 test */
@@ -350,11 +358,9 @@ static void MX_LPUART1_UART_Init(void)
   LL_APB1_GRP1_EnableClock(LL_APB1_GRP1_PERIPH_LPUART1);
 
   LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
-  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOB);
   /**LPUART1 GPIO Configuration
   PA0-CK_IN   ------> LPUART1_RX
   PA1   ------> LPUART1_TX
-  PB1   ------> LPUART1_DE
   */
   GPIO_InitStruct.Pin = LL_GPIO_PIN_0;
   GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
@@ -372,14 +378,6 @@ static void MX_LPUART1_UART_Init(void)
   GPIO_InitStruct.Alternate = LL_GPIO_AF_6;
   LL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
-  GPIO_InitStruct.Pin = LL_GPIO_PIN_1;
-  GPIO_InitStruct.Mode = LL_GPIO_MODE_ALTERNATE;
-  GPIO_InitStruct.Speed = LL_GPIO_SPEED_FREQ_VERY_HIGH;
-  GPIO_InitStruct.OutputType = LL_GPIO_OUTPUT_PUSHPULL;
-  GPIO_InitStruct.Pull = LL_GPIO_PULL_NO;
-  GPIO_InitStruct.Alternate = LL_GPIO_AF_4;
-  LL_GPIO_Init(GPIOB, &GPIO_InitStruct);
-
   /* LPUART1 interrupt Init */
   NVIC_SetPriority(LPUART1_IRQn, 0);
   NVIC_EnableIRQ(LPUART1_IRQn);
@@ -394,10 +392,7 @@ static void MX_LPUART1_UART_Init(void)
   LPUART_InitStruct.TransferDirection = LL_LPUART_DIRECTION_TX_RX;
   LPUART_InitStruct.HardwareFlowControl = LL_LPUART_HWCONTROL_NONE;
   LL_LPUART_Init(LPUART1, &LPUART_InitStruct);
-  LL_LPUART_EnableDEMode(LPUART1);
+  LL_LPUART_SetTXRXSwap(LPUART1, LL_LPUART_TXRX_SWAPPED);
-  LL_LPUART_SetDESignalPolarity(LPUART1, LL_LPUART_DE_POLARITY_HIGH);
-  LL_LPUART_SetDEAssertionTime(LPUART1, 0);
-  LL_LPUART_SetDEDeassertionTime(LPUART1, 0);
   /* USER CODE BEGIN LPUART1_Init 2 */
 
   /* Enable IDLE Interrupt */
@@ -406,6 +401,9 @@ static void MX_LPUART1_UART_Init(void)
   /* Enable RX Not Empty Interrupt */
   LL_LPUART_EnableIT_RXNE(LPUART1);
 
+  LL_LPUART_EnableDirectionRx(LPUART1);
+  LL_LPUART_EnableDirectionTx(LPUART1);
+  LL_LPUART_Enable(LPUART1);
   /* USER CODE END LPUART1_Init 2 */
 
 }
@@ -460,7 +458,6 @@ static void MX_GPIO_Init(void)
 
   /* GPIO Ports Clock Enable */
   LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOA);
-  LL_IOP_GRP1_EnableClock(LL_IOP_GRP1_PERIPH_GPIOB);
 
   /**/
   LL_GPIO_SetOutputPin(LED_B_GPIO_Port, LED_B_Pin);

fw/Core/Src/stm32l0xx_it.c

@@ -179,13 +179,13 @@ void LPUART1_IRQHandler(void)
   /* USER CODE END LPUART1_IRQn 0 */
   /* USER CODE BEGIN LPUART1_IRQn 1 */
 	/* If the IDLE flag is active */
-	if (LL_LPUART_IsActiveFlag_IDLE(LPUART1) == 1)
+	if (LL_LPUART_IsActiveFlag_IDLE(LPUART1) && LL_LPUART_IsEnabledIT_IDLE(LPUART1))
 	{
 		/* Clear the IDLE flag */
 		LL_LPUART_ClearFlag_IDLE(LPUART1);
 
 		/* Reset the buffer index */
-		lpuart1_rx_message_len = lpuart1_rx_message_index + 1;
+		lpuart1_rx_message_len = lpuart1_rx_message_index;
 		lpuart1_rx_message_index = 0;
 		lpuart1_rx_done = 1;
 	}

fw/iaq_wired_sensor.ioc

@@ -8,7 +8,7 @@ ProjectManager.ProjectFileName=iaq_wired_sensor.ioc
 ProjectManager.KeepUserCode=true
 PA10.Mode=I2C
 Mcu.UserName=STM32L011F4Ux
-Mcu.PinsNb=12
+Mcu.PinsNb=11
 ProjectManager.NoMain=false
 TIM21.IPParameters=Prescaler,Period,AutoReloadPreload,ClockDivision
 PA0-CK_IN.Mode=Asynchronous
@@ -34,8 +34,8 @@ ProjectManager.StackSize=0x400
 RCC.WatchDogFreq_Value=37000
 PA13.Signal=SYS_SWDIO
 Mcu.IP4=SYS
-RCC.HSI16_VALUE=16000000
 RCC.FCLKCortexFreq_Value=12000000
+RCC.HSI16_VALUE=16000000
 Mcu.IP5=TIM21
 I2C1.IPParameters=Timing
 Mcu.IP2=NVIC
@@ -58,11 +58,11 @@ RCC.APB2TimFreq_Value=12000000
 PA9.Signal=I2C1_SCL
 I2C1.Timing=0x40000A0B
 LPUART1.Parity=UART_PARITY_EVEN
-Mcu.Pin6=PA9
+Mcu.Pin6=PA10
-Mcu.Pin7=PA10
+Mcu.Pin7=PA13
 ProjectManager.RegisterCallBack=
-Mcu.Pin8=PA13
+Mcu.Pin8=PA14
-Mcu.Pin9=PA14
+Mcu.Pin9=VP_SYS_VS_Systick
 PA0-CK_IN.GPIO_PuPd=GPIO_PULLUP
 RCC.LSE_VALUE=32768
 PA1.GPIO_PuPd=GPIO_PULLUP
@@ -74,7 +74,7 @@ GPIO.groupedBy=Group By Peripherals
 Mcu.Pin2=PA5
 Mcu.Pin3=PA6
 Mcu.Pin4=PA7
-Mcu.Pin5=PB1
+Mcu.Pin5=PA9
 PA5.Signal=GPIO_Output
 ProjectManager.ProjectBuild=false
 RCC.HSE_VALUE=8000000
@@ -116,12 +116,11 @@ ProjectManager.UnderRoot=true
 ProjectManager.CoupleFile=false
 RCC.SYSCLKFreq_VALUE=12000000
 Mcu.Package=UFQFPN20
-PB1.Signal=LPUART1_DE
 PA6.Signal=GPIO_Output
 PA7.GPIO_Label=LED_R
 PA5.Locked=true
 PA7.Locked=true
-LPUART1.SwapParam=UART_ADVFEATURE_SWAP_DISABLE
+LPUART1.SwapParam=UART_ADVFEATURE_SWAP_ENABLE
 PA5.GPIO_Label=LED_B
 NVIC.ForceEnableDMAVector=true
 KeepUserPlacement=false
@@ -133,12 +132,10 @@ PA10.Signal=I2C1_SDA
 PA14.Signal=SYS_SWCLK
 ProjectManager.HeapSize=0x200
 NVIC.HardFault_IRQn=true\:0\:0\:false\:false\:true\:false\:false
-PB1.Mode=Hardware Flow Control (RS485)
 PA5.GPIOParameters=PinState,GPIO_Label
 ProjectManager.ComputerToolchain=false
 RCC.HSI_VALUE=16000000
-Mcu.Pin11=VP_TIM21_VS_ClockSourceINT
+Mcu.Pin10=VP_TIM21_VS_ClockSourceINT
-Mcu.Pin10=VP_SYS_VS_Systick
 RCC.APB1TimFreq_Value=12000000
 RCC.PWRFreq_Value=12000000
 RCC.APB1Freq_Value=12000000