flexio uart driver for freertos

michals — Thu, 26 Jul 2018 21:56:42 GMT

Here is my implementation of FreeRTOS driver for FLEXIO UART drvier. This is tested on MKL17Zxxx controller. It requires a patch to the fsl_flexio_uart.c to fix a bug in that driver (as shown on the previous post). If you use this code in your project please let me know if you find any bugs.

Here is a sample way to use the driver.

#define FLEXIO_UART_TX_PIN 6U // FLEXIO_D06
#define FLEXIO_UART_RX_PIN 7U // FLEXIO_D07
#define FLEXIO_CLOCK_FREQUENCY 4000000U // 4MHz to allow timer_div < 255

static flexio_uart_rtos_handle_t g_handle;
static flexio_uart_handle_t g_t_handle;

static uint8_t g_background_buffer[32]; // used by g_rtos_config struct

static struct _flexio_uart_rtos_config g_rtos_config = {
.flexio_uart.flexioBase = FLEXIO, /*!< FLEXIO UART base address */
.flexio_uart.TxPinIndex = FLEXIO_UART_TX_PIN,
.flexio_uart.RxPinIndex = FLEXIO_UART_RX_PIN,
.srcclk = FLEXIO_CLOCK_FREQUENCY, /*!< UART source clock in Hz*/
.baudrate = 9600U, /*!< Desired communication speed */
.bitCountPerChar = kFLEXIO_UART_8BitsPerChar, /*!< number of bits, 7/8/9 -bit */
.buffer = g_background_buffer, /*!< Buffer for background reception */
.buffer_size = sizeof(g_background_buffer) /*!< Size of buffer for background reception */
};

void task(void *pvParameters)

{

status_t result;

size_t size_not_used;

if ( (result=FLEXIO_UART_RTOS_Init(&g_handle, &g_t_handle, &g_rtos_config)) != kStatus_Success)
{
SEGGER_RTT_WriteString(0,"Task init failed.\n");

vTaskSuspend(NULL);

}

if ((result=FLEXIO_UART_RTOS_Send(&g_handle, g_tx_cmd_read_result, sizeof(g_tx_cmd_read_result))) != kStatus_Success)
{
SEGGER_RTT_WriteString(0, "Write cmd failed (send error %d).\r\n", result);
vTaskSuspend(NULL);
}

if ((result = FLEXIO_UART_RTOS_Receive(&g_handle, g_buffer, 2, &not_used)) != kStatus_Success) // get two bytes

{
SEGGER_RTT_WriteString(0, "Read cmd failed (receive error %d).\r\n", result);
vTaskSuspend(NULL);
}

Re: flexio uart driver for freertos

danielchen — Thu, 23 Aug 2018 22:55:15 GMT

Hi Michals:

Thank you very much for your sharing, it is very helpful

Regards

Daniel

topic flexio uart driver for freertos in Kinetis Microcontrollers

flexio uart driver for freertos

Re: flexio uart driver for freertos