Posted on June 03, 2016 at 22:35Hi everybody,
I have some issue with using the DMA Transfer method on a Discovery F3 (F303) board. Don't know if it's a bug, or if I missed something...
The HAL is generated with Cube (under Eclipse, Cube-Version is STM32Cube_FW_F3_V1.4.0).
Following issue:
I start a DMA-Receive (Mainclass.cpp, line 81), which is continuously restarted within the HAL_UART_RxCpltCallback (yes, I should try circular mode).
When a button-press occours I want to send some string-message. This works fine - but only one time.
Snippet (Mainclass.cpp, line 110):
if (last_key == '#')
{
strncpy((char*) uart_tx_buffer,
(const char*) ''oans, zwoa, gsuffa..'',
uart_tx_buffer_len);
HAL_UART_Transmit_DMA(uart, uart_tx_buffer, uart_tx_buffer_len);
}
Problem is, that after transmission the UART-State stays ''BUSY_RX_TX''. This prevents further transmissions. Maybe I should set the state by my own software, but no IRQ is called where I could do this.
A look into UART_DMATransmitCplt (file stm32f3xx_hal_uart.c) shows the enabling of some IRQ. But no IRQ is ever called.
Line 1848:
/* Enable the UART Transmit Complete Interrupt */
__HAL_UART_ENABLE_IT(huart, UART_IT_TC);
Workaround may be to use circular mode and stop transmission in the HAL_UART_TxCpltCallback?
So - which IRQ is enabled by line 1848 (or should be enabled)? Did I miss something?
Source files will be attached later.
Thank you
EDIT: I didn't manage to attach files. Blocked by administrator...
