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/*
* 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
* 2016-12-05 Pluto first implementation
*/
#include "usart.h"
static rt_err_t m451_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 as HXT and UART module clock divider as 1 */
CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
/* Set PD multi-function pins for UART0 RXD(PD.0) and TXD(PD.1) */
SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);
SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);
/* Reset UART module */
SYS_ResetModule(UART0_RST);
/* Configure UART0 and set UART0 Baudrate */
UART_Open(UART0, cfg->baud_rate);
/* Enable Interrupt */
UART_EnableInt(UART0, UART_INTEN_RDAIEN_Msk);
}
#endif /* RT_USING_UART0 */
#if defined(RT_USING_UART1)
#endif /* RT_USING_UART1 */
return RT_EOK;
}
static rt_err_t m451_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_INTEN_RDAIEN_Msk);
break;
}
case RT_DEVICE_CTRL_SET_INT: {
UART_EnableInt(UART0, UART_INTEN_RDAIEN_Msk);
break;
}
}
return RT_EOK;
}
static int m451_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 m451_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 m451_uart_ops =
{
m451_configure,
m451_control,
m451_putc,
m451_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 = &m451_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 */
}
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