Enable dual USART output functionality.

In other words, enable the USART connected to the serial port on
the Raspberry Pi GPIO header.

Sending a newline to either USART directs the generated entropy
to that USART.

1 files changed, 12 insertions, 4 deletions

diff --git a/src/entropy/stm32f4xx_it.c b/src/entropy/stm32f4xx_it.c
index 231b4fc..d60a229 100644
--- a/src/entropy/stm32f4xx_it.c
+++ b/src/entropy/stm32f4xx_it.c
@@ -41,8 +41,6 @@
 #include "stm32f4xx_it.h"
 #include "stm_init.h"
 
-extern TIM_HandleTypeDef htim2;
-
 /** @addtogroup STM32F4xx_HAL_Examples
   * @{
   */
@@ -171,8 +169,7 @@ void SysTick_Handler(void)
  * @brief  This function handles UART interrupt request.
  * @param  None
  * @retval None
- * @Note   This function is redefined in "main.h" and related to DMA stream
- *         used for USART data transmission
+ * @Note   HAL_UART_IRQHandler will call HAL_UART_TxCpltCallback in main.c.
  */
 void USART1_IRQHandler(void)
 {
@@ -180,6 +177,17 @@ void USART1_IRQHandler(void)
 }
 
 /**
+ * @brief  This function handles UART interrupt request.
+ * @param  None
+ * @retval None
+ * @Note   HAL_UART_IRQHandler will call HAL_UART_TxCpltCallback in main.c.
+ */
+void USART2_IRQHandler(void)
+{
+  HAL_UART_IRQHandler(&huart2);
+}
+
+/**
  * @brief  This function handles DMA1 Stream 6 interrupt request.
  * @param  None
  * @retval None