TM4C serial port transmission failed

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TM4C serial port transmission failed [Copy link]

The code written according to the official routine uses serial port 2. If you don’t want to use interrupts to send and receive, use the sending function void UART2_init(void) { SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD); SysCtlPeripheralEnable(SYSCTL_PERIPH_UART2); GPIOPinTypeUART(GPIO_PORTD_BASE,GPIO_PIN_6|GPIO_PIN_7); OPinConfigure (GPIO_PD7_U2TX); GPIOPinConfigure(GPIO_PD6_U2RX); UARTConfigSetExpClk(UART2_BASE,SysCtlClockGet(),115200,(UART_CONFIG_WLEN_8|UART_CONFIG_STOP_ONE|UART_CONFIG_PAR_NONE)); UARTEnable(UART2_BASE); } Main function: int main() { UART2_init(); while(1) { UARTCharPut(UART2_BASE,0XAA); } } The main function sends a byte 0XAA to the host computer. The host computer receives nothing. I don’t know why. Please give me some advice.

liyangyang

You can short-circuit two pins to debug to see if it can close spontaneously. The official serial port process can be used after modification.

finastic

What is the configuration of the serial port of the host computer? Is it the same as the configuration of UARTConfigSetExpClk(UART2_BASE,SysCtlClockGet(),115200,(UART_CONFIG_WLEN_8|UART_CONFIG_STOP_ONE|UART_CONFIG_PAR_NONE));? 115200, 8bit, 1 stop bit, no parity bit

LiSrRb-6

I don’t know if it is 1294. If it is 1294, you cannot use SysCtlClockGet() to get the current clock frequency and... You have not defined the UART clock source (call the function UARTClockSourceSet(UART7_BASE, UART_CLOCK_PIOSC); ). If it is 123, I don’t know.