diff --git a/libraries/SrcWrapper/src/stm32/uart.c b/libraries/SrcWrapper/src/stm32/uart.c
index 0f1dd22197..a8936f98b9 100644
--- a/libraries/SrcWrapper/src/stm32/uart.c
+++ b/libraries/SrcWrapper/src/stm32/uart.c
@@ -334,7 +334,11 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
       HAL_UARTEx_DisableStopMode(huart);
     }
     /* Trying default LPUART clock source */
-    if (HAL_UART_Init(huart) == HAL_OK) {
+    if (uart_rx == NP) {
+      if (HAL_HalfDuplex_Init(huart) == HAL_OK) {
+        return;
+      }
+    } else if (HAL_UART_Init(huart) == HAL_OK) {
       return;
     }
     /* Trying to change LPUART clock source */
@@ -350,7 +354,11 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
         __HAL_RCC_LPUART2_CONFIG(RCC_LPUART2CLKSOURCE_LSE);
       }
 #endif
-      if (HAL_UART_Init(huart) == HAL_OK) {
+      if (uart_rx == NP) {
+        if (HAL_HalfDuplex_Init(huart) == HAL_OK) {
+          return;
+        }
+      } else if (HAL_UART_Init(huart) == HAL_OK) {
         return;
       }
     }
@@ -363,7 +371,11 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
         __HAL_RCC_LPUART2_CONFIG(RCC_LPUART2CLKSOURCE_HSI);
       }
 #endif
-      if (HAL_UART_Init(huart) == HAL_OK) {
+      if (uart_rx == NP) {
+        if (HAL_HalfDuplex_Init(huart) == HAL_OK) {
+          return;
+        }
+      } else if (HAL_UART_Init(huart) == HAL_OK) {
         return;
       }
     }
@@ -376,7 +388,11 @@ void uart_init(serial_t *obj, uint32_t baudrate, uint32_t databits, uint32_t par
       __HAL_RCC_LPUART2_CONFIG(RCC_LPUART2CLKSOURCE_PCLK1);
     }
 #endif
-    if (HAL_UART_Init(huart) == HAL_OK) {
+    if (uart_rx == NP) {
+      if (HAL_HalfDuplex_Init(huart) == HAL_OK) {
+        return;
+      }
+    } else if (HAL_UART_Init(huart) == HAL_OK) {
       return;
     }
     if (obj->uart == LPUART1) {
diff --git a/variants/STM32H7xx/H742Z(G-I)T_H743Z(G-I)T_H747A(G-I)I_H747I(G-I)T_H750ZBT_H753ZIT_H757AII_H757IIT/variant_NUCLEO_H743ZI.cpp b/variants/STM32H7xx/H742Z(G-I)T_H743Z(G-I)T_H747A(G-I)I_H747I(G-I)T_H750ZBT_H753ZIT_H757AII_H757IIT/variant_NUCLEO_H743ZI.cpp
index 1740f1ff4f..b027be5843 100644
--- a/variants/STM32H7xx/H742Z(G-I)T_H743Z(G-I)T_H747A(G-I)I_H747I(G-I)T_H750ZBT_H753ZIT_H757AII_H757IIT/variant_NUCLEO_H743ZI.cpp
+++ b/variants/STM32H7xx/H742Z(G-I)T_H743Z(G-I)T_H747A(G-I)I_H747I(G-I)T_H750ZBT_H753ZIT_H757AII_H757IIT/variant_NUCLEO_H743ZI.cpp
@@ -364,7 +364,6 @@ WEAK void SystemClock_Config(void)
                                              | RCC_PERIPHCLK_USART234578 | RCC_PERIPHCLK_I2C123
                                              | RCC_PERIPHCLK_I2C4 | RCC_PERIPHCLK_SPI123
                                              | RCC_PERIPHCLK_SPI45 | RCC_PERIPHCLK_SPI6;
-  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_ADC;
   PeriphClkInitStruct.PLL2.PLL2M = 1;
   PeriphClkInitStruct.PLL2.PLL2N = 20;
   PeriphClkInitStruct.PLL2.PLL2P = 2;
@@ -373,11 +372,19 @@ WEAK void SystemClock_Config(void)
   PeriphClkInitStruct.PLL2.PLL2RGE = RCC_PLL2VCIRANGE_3;
   PeriphClkInitStruct.PLL2.PLL2VCOSEL = RCC_PLL2VCOMEDIUM;
   PeriphClkInitStruct.PLL2.PLL2FRACN = 0.0;
+  PeriphClkInitStruct.PLL3.PLL3M = 1;
+  PeriphClkInitStruct.PLL3.PLL3N = 24;
+  PeriphClkInitStruct.PLL3.PLL3P = 2;
+  PeriphClkInitStruct.PLL3.PLL3Q = 6;
+  PeriphClkInitStruct.PLL3.PLL3R = 2;
+  PeriphClkInitStruct.PLL3.PLL3RGE = RCC_PLL3VCIRANGE_3;
+  PeriphClkInitStruct.PLL3.PLL3VCOSEL = RCC_PLL3VCOWIDE;
+  PeriphClkInitStruct.PLL3.PLL3FRACN = 0.0;
   PeriphClkInitStruct.AdcClockSelection = RCC_ADCCLKSOURCE_PLL2;
   PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
   PeriphClkInitStruct.QspiClockSelection = RCC_QSPICLKSOURCE_D1HCLK;
   PeriphClkInitStruct.SdmmcClockSelection = RCC_SDMMCCLKSOURCE_PLL;
-  PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_D3PCLK1;
+  PeriphClkInitStruct.Lpuart1ClockSelection = RCC_LPUART1CLKSOURCE_PLL3;
   PeriphClkInitStruct.Usart16ClockSelection = RCC_USART16CLKSOURCE_D2PCLK2;
   PeriphClkInitStruct.Usart234578ClockSelection = RCC_USART234578CLKSOURCE_D2PCLK1;
   PeriphClkInitStruct.I2c123ClockSelection = RCC_I2C123CLKSOURCE_D2PCLK1;