Posted on June 21, 2016 at 15:02 Hi clive1,
The code execute this macro
/**
* @brief Enable the remapping of USART2 alternate function CTS, RTS, CK, TX and RX.
* @note ENABLE: Remap (CTS/PD3, RTS/PD4, TX/PD5, RX/PD6, CK/PD7)
* @retval None
*/
#define __HAL_AFIO_REMAP_USART2_ENABLE() SET_BIT(AFIO->MAPR, AFIO_MAPR_USART2_REMAP)
GPIOD clock is enabled by this macro:
__HAL_RCC_GPIOD_CLK_ENABLE();
This is the UART2 Init function:
/* USART2 init function */
static void MX_USART2_UART_Init(void)
{
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
huart2.Init.OverSampling = UART_OVERSAMPLING_16;
if (HAL_UART_Init(&huart2) != HAL_OK)
{
Error_Handler();
}
} Inside the Init function there is this function's call to: /* Init the low level hardware */
HAL_UART_MspInit(huart);
This function initialize the low level of UART2:
else if(huart->Instance==USART2)
{
/* USER CODE BEGIN USART2_MspInit 0 */
/* USER CODE END USART2_MspInit 0 */
/* Peripheral clock enable */
__HAL_RCC_USART2_CLK_ENABLE();
/**USART2 GPIO Configuration
PD5 ------> USART2_TX
PD6 ------> USART2_RX
*/
GPIO_InitStruct.Pin = Debug_Serial_TX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
HAL_GPIO_Init(Debug_Serial_TX_GPIO_Port, &GPIO_InitStruct);
GPIO_InitStruct.Pin = Debug_Serial_RX_Pin;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init(Debug_Serial_RX_GPIO_Port, &GPIO_InitStruct);
//__HAL_AFIO_REMAP_USART2_ENABLE();
/* Peripheral interrupt init */
HAL_NVIC_SetPriority(USART2_IRQn, 0, 0);
HAL_NVIC_EnableIRQ(USART2_IRQn);
/* USER CODE BEGIN USART2_MspInit 1 */
/* USER CODE END USART2_MspInit 1 */
}
And here the debug session fails.
