source: ReferenceDesigns/w3_802.11/c/wlan_w3_high/w3_uart.c

#include "xuartlite.h"

#include "wlan_platform_high.h"
#include "wlan_mac_high.h"
#include "w3_high.h"
#include "w3_uart.h"
#include "wlan_mac_common.h"
#include "xparameters.h"

static XUartLite UartLite;

// UART interface
static u8 uart_rx_buffer[UART_BUFFER_SIZE];       ///< Buffer for received byte from UART

// Private functions
void _w3_uart_rx_handler(void *CallBackRef, unsigned int EventData);

int w3_uart_init(){
    int Status;

    // Initialize the UART driver
    Status = XUartLite_Initialize(&UartLite, PLATFORM_DEV_ID_UART);
    if (Status != XST_SUCCESS) {
        wlan_printf(PL_ERROR, "ERROR: Could not initialize UART\n");
        Status = WLAN_FAILURE;
    }
    return Status;
}
int w3_uart_setup_interrupt() {
    int Status;
    // UART
    Status = wlan_platform_interrupt_connect(PLATFORM_INT_ID_UART, (wlan_intr_handler_t)XUartLite_InterruptHandler, &UartLite);
    if (Status != XST_SUCCESS) {
        wlan_printf(PL_ERROR, "Failed to set up UART interrupt\n");
        return WLAN_FAILURE;
    }
    wlan_platform_interrupt_enable(PLATFORM_INT_ID_UART);
    XUartLite_SetRecvHandler(&UartLite, _w3_uart_rx_handler, &UartLite);
    XUartLite_EnableInterrupt(&UartLite);
    return WLAN_SUCCESS;
}

void _w3_uart_rx_handler(void *CallBackRef, unsigned int EventData){
    #ifdef _ISR_PERF_MON_EN_
        wlan_mac_set_dbg_hdr_out(ISR_PERF_MON_GPIO_MASK);
    #endif
        XUartLite_Recv(&UartLite, uart_rx_buffer, UART_BUFFER_SIZE);
        wlan_mac_high_uart_rx_callback(uart_rx_buffer[0]);
    #ifdef _ISR_PERF_MON_EN_
        wlan_mac_clear_dbg_hdr_out(ISR_PERF_MON_GPIO_MASK);
    #endif
}