rt-thread/bsp/nuvoton_m05x/drivers/usart.c

/*
 * File      : usart.c
 * This file is part of RT-Thread RTOS
 * COPYRIGHT (C) 2006-2014, RT-Thread Development Team
 *
 * The license and distribution terms for this file may be
 * found in the file LICENSE in this distribution or at
 * http://www.rt-thread.org/license/LICENSE
 *
 * Change Logs:
 * Date           Author       Notes
 * 2014-11-29     Bright       the first version
 */

#include "M051Series.h"
#include <rtdevice.h>
#include "usart.h"


static rt_err_t m05x_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
{
    UART_T* uart;

    uart = (UART_T *)serial->parent.user_data;
#if defined(RT_USING_UART0)
    if (uart == UART0) {
        /* Enable UART module clock */
        CLK_EnableModuleClock(UART0_MODULE);
        /* Select UART module clock source */
        CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UART_S_PLL, CLK_CLKDIV_UART(1));

        /* Set P3 multi-function pins for UART0 RXD and TXD */
        SYS->P3_MFP &= ~(SYS_MFP_P30_Msk | SYS_MFP_P31_Msk);
        SYS->P3_MFP |= (SYS_MFP_P30_RXD0 | SYS_MFP_P31_TXD0);
        
        /* Reset IP */
        SYS_ResetModule(UART0_RST);
        /* Configure UART0 and set UART0 Baudrate */
        UART_Open(UART0, cfg->baud_rate);
        
        /* Enable Interrupt */
        UART_EnableInt(UART0, UART_IER_RDA_IEN_Msk);
    }
#endif /* RT_USING_UART0 */

#if defined(RT_USING_UART1)
#endif /* RT_USING_UART1 */
    return RT_EOK;
}

static rt_err_t m05x_control(struct rt_serial_device *serial, int cmd, void *arg)
{
    UART_T* uart;
    uart = (UART_T *)serial->parent.user_data;

    switch (cmd)
    {
        case RT_DEVICE_CTRL_CLR_INT: {
                /* Disable Interrupt */
                UART_DisableInt(uart, UART_IER_RDA_IEN_Msk);
            break;
        }
        case RT_DEVICE_CTRL_SET_INT: {
                UART_EnableInt(uart, UART_IER_RDA_IEN_Msk);
            break;
        }
    }

    return RT_EOK;
}

static int m05x_putc(struct rt_serial_device *serial, char c)
{
    UART_T* uart;
    uart = (UART_T *)serial->parent.user_data;
    if (UART_IS_TX_FULL(uart)) {
        UART_WAIT_TX_EMPTY(uart);
        
    }
    UART_WRITE(uart, c);
    return 1;
}

static int m05x_getc(struct rt_serial_device *serial)
{
    int ch = -1;
    UART_T* uart;
    uart = (UART_T *)serial->parent.user_data;

    if (UART_IS_RX_READY(uart))
        ch = UART_READ(uart);
    return ch;
}

static const struct rt_uart_ops m05x_uart_ops =
{
    m05x_configure,
    m05x_control,
    m05x_putc,
    m05x_getc,
};

#if defined(RT_USING_UART0)
struct rt_serial_device serial0;

void UART0_IRQHandler(void)
{
    /* enter interrupt */
    rt_interrupt_enter();

    if (UART_IS_RX_READY(UART0)) {
        rt_hw_serial_isr(&serial0, RT_SERIAL_EVENT_RX_IND);
    }
    /* leave interrupt */
    rt_interrupt_leave();
}
#endif /* RT_USING_UART0 */

void rt_hw_usart_init(void)
{
#ifdef RT_USING_UART0
    struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
    config.baud_rate = BAUD_RATE_115200;
    serial0.ops    = &m05x_uart_ops;
    serial0.config = config;

    /* register UART0 device */
    rt_hw_serial_register(&serial0, "uart0",
                          RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
                          UART0);
#endif /* RT_USING_UART0 */

}