126 lines
3.1 KiB
C
126 lines
3.1 KiB
C
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/*
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* File : drv_usart.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2012, RT-Thread Development Team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <rtdevice.h>
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#include <encoding.h>
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#include <platform.h>
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#include <interrupt.h>
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static void usart_handler(int vector, void *param)
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{
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rt_hw_serial_isr((struct rt_serial_device *)param, RT_SERIAL_EVENT_RX_IND);
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}
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static rt_err_t usart_configure(struct rt_serial_device *serial,
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struct serial_configure *cfg)
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{
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RT_ASSERT(serial != RT_NULL);
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RT_ASSERT(cfg != RT_NULL);
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GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_UART0_MASK;
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GPIO_REG(GPIO_IOF_EN) |= IOF0_UART0_MASK;
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UART0_REG(UART_REG_DIV) = get_cpu_freq() / cfg->baud_rate - 1;
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UART0_REG(UART_REG_TXCTRL) |= UART_TXEN;
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UART0_REG(UART_REG_RXCTRL) |= UART_RXEN;
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UART0_REG(UART_REG_IE) = UART_IP_RXWM;
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return RT_EOK;
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}
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static rt_err_t usart_control(struct rt_serial_device *serial,
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int cmd, void *arg)
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{
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RT_ASSERT(serial != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_CLR_INT:
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break;
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case RT_DEVICE_CTRL_SET_INT:
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break;
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}
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return RT_EOK;
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}
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static int usart_putc(struct rt_serial_device *serial, char c)
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{
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while (UART0_REG(UART_REG_TXFIFO) & 0x80000000) ;
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UART0_REG(UART_REG_TXFIFO) = c;
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return 0;
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}
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static int usart_getc(struct rt_serial_device *serial)
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{
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rt_int32_t val = UART0_REG(UART_REG_RXFIFO);
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if (val > 0)
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return (rt_uint8_t)val;
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else
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return -1;
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}
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static struct rt_uart_ops ops =
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{
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usart_configure,
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usart_control,
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usart_putc,
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usart_getc,
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};
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static struct rt_serial_device serial =
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{
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.ops = &ops,
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.config.baud_rate = BAUD_RATE_115200,
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.config.bit_order = BIT_ORDER_LSB,
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.config.data_bits = DATA_BITS_8,
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.config.parity = PARITY_NONE,
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.config.stop_bits = STOP_BITS_1,
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.config.invert = NRZ_NORMAL,
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.config.bufsz = RT_SERIAL_RB_BUFSZ,
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};
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int rt_hw_uart_init(void)
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{
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rt_hw_serial_register(
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&serial,
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"dusart",
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RT_DEVICE_FLAG_STREAM
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| RT_DEVICE_FLAG_RDWR
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| RT_DEVICE_FLAG_INT_RX, RT_NULL);
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rt_hw_interrupt_install(
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INT_UART0_BASE,
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usart_handler,
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(void *) & (serial.parent),
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"uart interrupt");
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rt_hw_interrupt_unmask(INT_UART0_BASE);
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return 0;
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}
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INIT_BOARD_EXPORT(rt_hw_uart_init);
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