Posted on October 24, 2016 at 01:00
Hi.
I'd like to use the UART for MIDI input.
I've configured the UART on my STM32F7-Discovery board and perform a led toggle whenever an incoming message is received. I'm using the interrupt mode similar to the Cube firmware example ''UART_TwoBoards_ComIT''. However my receive buffer is unchanged and I've initialized it with dummy-data just to confirm that it doesn't seem to get updated by the USART6_IrqHandler routine.
What I get is a ''frame error'' in the UART_ErrorCallback routine. Could this have anything to do with the fact that a MIDI-note down consists of 3 bytes? When I hit a note on the MIDI-keyboard the IRQ-handler is only triggered once! This is unlike how I've worked with UART on other platforms. Then the incoming callback is triggered three times on a MIDI note-on event since it consists of 3 bytes.
void
USART6_IRQHandler(
void
)
{
extern
uint8_t aRxBuffer[];
BSP_LED_Toggle(LED1);
BSP_LCD_DisplayIntAt(0, 70, *(UartHandle.pRxBuffPtr), CENTER_MODE);
HAL_UART_IRQHandler(&UartHandle);
}
void
my_UART_Init(UART_HandleTypeDef *UartHandle)
{
UartHandle->Instance = USART6;
UartHandle->Init.BaudRate = 31250;
UartHandle->Init.WordLength = UART_WORDLENGTH_8B;
UartHandle->Init.StopBits = UART_STOPBITS_1;
UartHandle->Init.Parity = UART_PARITY_NONE;
UartHandle->Init.HwFlowCtl = UART_HWCONTROL_NONE;
UartHandle->Init.Mode = UART_MODE_TX_RX;
UartHandle->AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
if
(HAL_UART_DeInit(UartHandle) != HAL_OK)
{
Error_Handler();
}
if
(HAL_UART_Init(UartHandle) != HAL_OK)
{
Error_Handler();
}
}
#stm32f746g-discovery-uart-midi
