Posted on October 26, 2015 at 20:20Hi,
I have connected two MCU's through UART.
I want to send a string from MCU 1 to MCU 2.
once the MCU 1 sent the string it need to wait for some time to receive the reply from MCU 2.
If MCU 1 did not get any reply from MCU 2,it need to send back a string 'u there?'
How we can do this ?
I have tried the following with no success :(
I am really vey new for programming forgive me if you find error,
uint8_t txBuffer[10] = ''HELLO\r\n''
uint8_t txBufferN[15] = ''u there ? \r\n''
uint8_t rxBuffer[20] ;
HAL_UART_Transmit_DMA
(&UartHandle, (
uint8_t
*)txBuffer, 10);
HAL_Delay(100);
HAL_UART_Receive_DMA
(&UartHandle, (
uint8_t
*)rxBuffer, 20);
HAL_Delay(1000);
if
(rxBuffer[0]==
'H'
&&rxBuffer[1]==
'A'
&&rxBuffer[2]==
'I'
)
{
txBuffer[0]=
'C'
;
txBuffer[1]=
'I'
;
txBuffer[2]=
'A'
;
txBuffer[3]=
'O'
;
txBuffer[4]=
'\r'
;
txBuffer[5]=
'\n'
;
HAL_UART_Transmit_DMA(&UartHandle, (
uint8_t
*)txBuffer, 10);
}
else
{
HAL_UART_Transmit_DMA
(&UartHandle, (
uint8_t
*)txBufferN, 15);
}
