133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/*
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* File : usart.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006-2014, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2016-12-05 Pluto first implementation
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*/
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#include "usart.h"
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static rt_err_t m451_configure(struct rt_serial_device *serial, struct serial_configure *cfg)
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{
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UART_T* uart;
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uart = (UART_T *)serial->parent.user_data;
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#if defined(RT_USING_UART0)
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if (uart == UART0) {
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/* Enable UART module clock */
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CLK_EnableModuleClock(UART0_MODULE);
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/* Select UART module clock source as HXT and UART module clock divider as 1 */
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CLK_SetModuleClock(UART0_MODULE, CLK_CLKSEL1_UARTSEL_HXT, CLK_CLKDIV0_UART(1));
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/* Set PD multi-function pins for UART0 RXD(PD.0) and TXD(PD.1) */
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SYS->GPD_MFPL &= ~(SYS_GPD_MFPL_PD0MFP_Msk | SYS_GPD_MFPL_PD1MFP_Msk);
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SYS->GPD_MFPL |= (SYS_GPD_MFPL_PD0MFP_UART0_RXD | SYS_GPD_MFPL_PD1MFP_UART0_TXD);
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/* Reset UART module */
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SYS_ResetModule(UART0_RST);
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/* Configure UART0 and set UART0 Baudrate */
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UART_Open(UART0, cfg->baud_rate);
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/* Enable Interrupt */
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UART_EnableInt(UART0, UART_INTEN_RDAIEN_Msk);
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}
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#endif /* RT_USING_UART0 */
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#if defined(RT_USING_UART1)
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#endif /* RT_USING_UART1 */
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return RT_EOK;
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}
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static rt_err_t m451_control(struct rt_serial_device *serial, int cmd, void *arg)
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{
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UART_T* uart;
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uart = (UART_T *)serial->parent.user_data;
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT: {
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/* Disable Interrupt */
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UART_DisableInt(uart, UART_INTEN_RDAIEN_Msk);
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break;
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}
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case RT_DEVICE_CTRL_SET_INT: {
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UART_EnableInt(UART0, UART_INTEN_RDAIEN_Msk);
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break;
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}
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}
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return RT_EOK;
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}
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static int m451_putc(struct rt_serial_device *serial, char c)
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{
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UART_T* uart;
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uart = (UART_T *)serial->parent.user_data;
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if (UART_IS_TX_FULL(uart)) {
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UART_WAIT_TX_EMPTY(uart);
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}
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UART_WRITE(uart, c);
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return 1;
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}
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static int m451_getc(struct rt_serial_device *serial)
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{
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int ch = -1;
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UART_T* uart;
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uart = (UART_T *)serial->parent.user_data;
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if (UART_IS_RX_READY(uart))
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ch = UART_READ(uart);
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return ch;
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}
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static const struct rt_uart_ops m451_uart_ops =
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{
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m451_configure,
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m451_control,
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m451_putc,
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m451_getc,
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};
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#if defined(RT_USING_UART0)
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struct rt_serial_device serial0;
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void UART0_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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if (UART_IS_RX_READY(UART0)) {
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rt_hw_serial_isr(&serial0, RT_SERIAL_EVENT_RX_IND);
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}
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif /* RT_USING_UART0 */
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void rt_hw_usart_init(void)
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{
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#ifdef RT_USING_UART0
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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config.baud_rate = BAUD_RATE_115200;
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serial0.ops = &m451_uart_ops;
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serial0.config = config;
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/* register UART0 device */
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rt_hw_serial_register(&serial0, "uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX,
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UART0);
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#endif /* RT_USING_UART0 */
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}
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