Flexio baud problem

zahomz — Tue, 08 Mar 2016 01:29:13 GMT

I'm trying to use the sdk driver examples about flexio uart(use FRDM-K82F board). I found that everything is ok when I use baud higher than 38400. When I use the baud lower than 38400, the data is error.

Any suggestions for how to find/fix the problem?

Example Code as below:

lpuart_state_t lpuartStatePtr;

flexio_user_config_t userConfig =

{

.useInt = true,

.onDozeEnable = false,

.onDebugEnable = true,

.fastAccessEnable = false

};

// Enable clock for PORTs, setup board clock source, config pin

hardware_init();

// Call OSA_Init to setup LP Timer for timeout

OSA_Init();

FLEXIO_DRV_Init(s_flexioInstance,&userConfig);

FLEXIO_DRV_Start(s_flexioInstance);

/* Fill in FlexIO UART config data */

flexio_uart_userconfig_t uartConfig;

uartConfig.bitCounter = kFlexIOUart8BitsPerChar;

uartConfig.baudRate = 9600;

uartConfig.uartMode = flexioUART_TxRx;

uartConfig.txConfig.pinIdx = 0;

uartConfig.txConfig.shifterIdx = 0;

uartConfig.txConfig.timerIdx = 0;

uartConfig.rxConfig.pinIdx = 2;

uartConfig.rxConfig.shifterIdx = 1;

uartConfig.rxConfig.timerIdx = 1;

/* init the FlexIO simulated UART module with base address and config structure*/

FLEXIO_UART_DRV_Init(s_flexioInstance, &uartState, &uartConfig);

while(true)

{

FLEXIO_UART_DRV_SendData(&uartState, txBuff, DATA_LENGTH);

flexio_uart_reset_buffer(rxBuff,DATA_LENGTH);

FLEXIO_UART_DRV_ReceiveDataBlocking(&uartState, rxBuff, DATA_LENGTH,5000U);

}

Re: Flexio baud problem

zahomz — Tue, 08 Mar 2016 08:12:20 GMT

I found that it will configure register FLEXIOx_TIMCMPn(FLEXIO_UART_DRV_Init->FLEXIO_UART_Tx_HAL_Configure).

When flexio uart's baud is 9600, CMP[7:0] is not enough to store the value.

How could I resolve this problem?

Kinetis Software Development KitのトピックRe: Flexio baud problem

Flexio baud problem

Re: Flexio baud problem