I ran into some issues configuring my stm32f429-DISCO board for a UART transmission on UART5. I used the example project provided by st. To be exact, the UART/UART_TwoBoards_ComDMA in version 1.7.0. In this example the USART1 is used to circle one data package around. When the DISCO-board is programmed with the original code, I can see the USART1 output message on my oscilloscope.
On the other hand, when I try the same thing with the UART5, because the pins for USART1 will be blocked in my final configuration it won't work.
I narrowed the problem down to the initialization process.
HAL_UART_MspInit(huart);
This function is not setting the TC and RXNE bit in UART1->SR, and therefore the UART5 is not configured. I know for UART1 you need to enable the clock, because it can be a synchronous transmission.
__HAL_RCC_USART1_CLK_ENABLE();
I can't seem to find a similar function for UART5. Has somebody an idea or a hint for me?
In case a bigger problem is underlying this issue, here are the changed settings for the UART5 configuration of the example.
/* Definition for USARTx clock resources */
#define USARTx UART5
//#define USARTx_CLK_ENABLE() __HAL_RCC_USART1_CLK_ENABLE();
#define DMAx_CLK_ENABLE() __HAL_RCC_DMA1_CLK_ENABLE()
#define USARTx_RX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOD_CLK_ENABLE()
#define USARTx_TX_GPIO_CLK_ENABLE() __HAL_RCC_GPIOC_CLK_ENABLE()
//#define USARTx_FORCE_RESET() __HAL_RCC_USART1_FORCE_RESET()
//#define USARTx_RELEASE_RESET() __HAL_RCC_USART1_RELEASE_RESET()
/* Definition for USARTx Pins */
#define USARTx_TX_PIN GPIO_PIN_12
#define USARTx_TX_GPIO_PORT GPIOC
#define USARTx_TX_AF GPIO_AF8_UART5
#define USARTx_RX_PIN GPIO_PIN_2
#define USARTx_RX_GPIO_PORT GPIOD
#define USARTx_RX_AF GPIO_AF8_UART5
/* Definition for USARTx's DMA */
#define USARTx_TX_DMA_CHANNEL DMA_CHANNEL_4
#define USARTx_TX_DMA_STREAM DMA1_Stream7
#define USARTx_RX_DMA_CHANNEL DMA_CHANNEL_4
#define USARTx_RX_DMA_STREAM DMA1_Stream0
/* Definition for USARTx's NVIC */
#define USARTx_DMA_TX_IRQn DMA1_Stream7_IRQn
#define USARTx_DMA_RX_IRQn DMA1_Stream0_IRQn
#define USARTx_DMA_TX_IRQHandler DMA1_Stream7_IRQHandler
#define USARTx_DMA_RX_IRQHandler DMA1_Stream0_IRQHandler
#define USARTx_IRQn UART5_IRQn
#define USARTx_IRQHandler UART5_IRQHandler
I'm happy for any suggestion and help that guides me in the right direction.
Thank you for your time,
eimer
UART5 has no S, so the function to enable the clock is called
__HAL_RCC_UART5_CLK_ENABLE();, like e.g. there: Receiving data from 2 UARTs, STM32F4-Discovery, HAL drivers