395 lines
8.6 KiB
C
395 lines
8.6 KiB
C
/*
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* File : serial.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2006, 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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* 2006-03-13 Bernard first version
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* 2011-05-15 lgnq modified according bernard's implementaion.
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*/
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#include <rtthread.h>
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#include "serial.h"
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/**
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* @addtogroup FM3 MB9B500
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*/
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/*@{*/
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/* RT-Thread Device Interface */
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/**
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* This function initializes serial
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*/
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static rt_err_t rt_serial_init(rt_device_t dev)
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{
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struct serial_device *uart = (struct serial_device*)dev->user_data;
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if (!(dev->flag & RT_DEVICE_FLAG_ACTIVATED))
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{
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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rt_memset(uart->int_rx->rx_buffer, 0,
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sizeof(uart->int_rx->rx_buffer));
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uart->int_rx->read_index = uart->int_rx->save_index = 0;
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}
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if (dev->flag & RT_DEVICE_FLAG_INT_TX)
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{
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rt_memset(uart->int_tx->tx_buffer, 0,
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sizeof(uart->int_tx->tx_buffer));
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uart->int_tx->write_index = uart->int_tx->save_index = 0;
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}
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dev->flag |= RT_DEVICE_FLAG_ACTIVATED;
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}
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return RT_EOK;
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}
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/* save a char to serial buffer */
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static void rt_serial_savechar(struct serial_device *uart, char ch)
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{
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rt_base_t level;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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uart->int_rx->rx_buffer[uart->int_rx->save_index] = ch;
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uart->int_rx->save_index ++;
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if (uart->int_rx->save_index >= UART_RX_BUFFER_SIZE)
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uart->int_rx->save_index = 0;
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/* if the next position is read index, discard this 'read char' */
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if (uart->int_rx->save_index == uart->int_rx->read_index)
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{
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uart->int_rx->read_index ++;
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if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
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uart->int_rx->read_index = 0;
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}
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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}
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static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
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{
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struct serial_device *uart;
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RT_ASSERT(dev != RT_NULL);
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uart = (struct serial_device*)dev->user_data;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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/* enable interrupt */
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UART_ENABLE_IRQ(uart->rx_irq);
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}
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return RT_EOK;
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}
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static rt_err_t rt_serial_close(rt_device_t dev)
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{
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struct serial_device *uart;
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RT_ASSERT(dev != RT_NULL);
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uart = (struct serial_device*)dev->user_data;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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/* disable interrupt */
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UART_DISABLE_IRQ(uart->rx_irq);
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}
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return RT_EOK;
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}
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static rt_size_t rt_serial_read(rt_device_t dev, rt_off_t pos, void *buffer,
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rt_size_t size)
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{
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rt_uint8_t *ptr;
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rt_err_t err_code;
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struct serial_device *uart;
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ptr = buffer;
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err_code = RT_EOK;
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uart = (struct serial_device*)dev->user_data;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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rt_base_t level;
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/* interrupt mode Rx */
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while (size)
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{
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if (uart->int_rx->read_index != uart->int_rx->save_index)
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{
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*ptr++ = uart->int_rx->rx_buffer[uart->int_rx->read_index];
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size --;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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uart->int_rx->read_index ++;
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if (uart->int_rx->read_index >= UART_RX_BUFFER_SIZE)
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uart->int_rx->read_index = 0;
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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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}
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else
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{
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/* set error code */
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err_code = -RT_EEMPTY;
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break;
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}
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}
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}
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else
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{
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/* polling mode */
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while ((rt_uint32_t)ptr - (rt_uint32_t)buffer < size)
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{
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while (uart->uart_device->SSR & SSR_RDRF)
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{
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*ptr = uart->uart_device->RDR & 0xff;
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ptr ++;
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}
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}
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}
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/* set error code */
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rt_set_errno(err_code);
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return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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}
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static rt_size_t rt_serial_write(rt_device_t dev, rt_off_t pos,
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const void *buffer, rt_size_t size)
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{
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rt_uint8_t *ptr;
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rt_err_t err_code;
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struct serial_device *uart;
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err_code = RT_EOK;
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ptr = (rt_uint8_t*)buffer;
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uart = (struct serial_device*)dev->user_data;
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if (dev->flag & RT_DEVICE_FLAG_INT_TX)
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{
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/* interrupt mode Tx */
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while (uart->int_tx->save_index != uart->int_tx->write_index)
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{
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/* save on tx buffer */
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uart->int_tx->tx_buffer[uart->int_tx->save_index] = *ptr++;
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-- size;
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/* move to next position */
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uart->int_tx->save_index ++;
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/* wrap save index */
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if (uart->int_tx->save_index >= UART_TX_BUFFER_SIZE)
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uart->int_tx->save_index = 0;
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}
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/* set error code */
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if (size > 0)
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err_code = -RT_EFULL;
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}
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else
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{
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/* polling mode */
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while (size)
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{
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/*
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* to be polite with serial console add a line feed
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* to the carriage return character
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*/
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if (*ptr == '\n' && (dev->flag & RT_DEVICE_FLAG_STREAM))
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{
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while (!(uart->uart_device->SSR & SSR_TDRE));
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uart->uart_device->TDR = '\r';
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}
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while (!(uart->uart_device->SSR & SSR_TDRE));
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uart->uart_device->TDR = (*ptr & 0x1FF);
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++ptr;
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--size;
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}
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}
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/* set error code */
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rt_set_errno(err_code);
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return (rt_uint32_t)ptr - (rt_uint32_t)buffer;
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}
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static rt_err_t rt_serial_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_SUSPEND:
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/* suspend device */
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dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
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break;
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case RT_DEVICE_CTRL_RESUME:
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/* resume device */
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dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
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break;
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}
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return RT_EOK;
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}
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/*
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* serial register
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*/
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rt_err_t rt_hw_serial_register(rt_device_t device, const char *name,
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rt_uint32_t flag, struct serial_device *serial)
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{
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RT_ASSERT(device != RT_NULL);
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device->type = RT_Device_Class_Char;
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device->rx_indicate = RT_NULL;
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device->tx_complete = RT_NULL;
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device->init = rt_serial_init;
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device->open = rt_serial_open;
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device->close = rt_serial_close;
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device->read = rt_serial_read;
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device->write = rt_serial_write;
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device->control = rt_serial_control;
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device->user_data = serial;
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/* register a character device */
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return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
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}
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/* ISR for serial interrupt */
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void rt_hw_serial_isr(rt_device_t device)
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{
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struct serial_device *uart = (struct serial_device*)device->user_data;
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/* interrupt mode receive */
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RT_ASSERT(device->flag & RT_DEVICE_FLAG_INT_RX);
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/* save on rx buffer */
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while (uart->uart_device->SSR & SSR_RDRF)
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{
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rt_serial_savechar(uart, uart->uart_device->RDR & 0xff);
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}
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/* invoke callback */
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if (device->rx_indicate != RT_NULL)
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{
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rt_size_t rx_length;
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/* get rx length */
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rx_length = uart->int_rx->read_index > uart->int_rx->save_index ?
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UART_RX_BUFFER_SIZE - uart->int_rx->read_index + uart->int_rx->save_index :
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uart->int_rx->save_index - uart->int_rx->read_index;
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device->rx_indicate(device, rx_length);
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}
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}
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#ifdef RT_USING_UART0
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/* UART0 device driver structure */
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#define UART0 FM3_MFS0_UART
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struct serial_int_rx uart0_int_rx;
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struct serial_device uart0 =
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{
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UART0,
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MFS0RX_IRQn,
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MFS0TX_IRQn,
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&uart0_int_rx,
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RT_NULL
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};
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struct rt_device uart0_device;
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void MFS0RX_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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rt_hw_serial_isr(&uart0_device);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif
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#ifdef RT_USING_UART2
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/* UART2 device driver structure */
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#define UART2 FM3_MFS2_UART
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struct serial_int_rx uart2_int_rx;
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struct serial_device uart2 =
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{
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UART2,
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MFS2RX_IRQn,
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MFS2TX_IRQn,
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&uart2_int_rx,
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RT_NULL
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};
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struct rt_device uart2_device;
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void MFS2RX_IRQHandler(void)
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{
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/* enter interrupt */
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rt_interrupt_enter();
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rt_hw_serial_isr(&uart2_device);
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/* leave interrupt */
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rt_interrupt_leave();
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}
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#endif
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void rt_hw_serial_init(void)
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{
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#ifdef RT_USING_UART0
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/* initialize UART0 */
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/* Set Uart Ch0 Port, SIN0_0, SOT0_0 */
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FM3_GPIO->PFR2 = FM3_GPIO->PFR2 | 0x0006;
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FM3_GPIO->EPFR07 = FM3_GPIO->EPFR07 | 0x00000040;
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uart0.uart_device->SMR = SMR_MD_UART | SMR_SOE;;
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uart0.uart_device->BGR = (40000000UL + (BPS/2))/BPS - 1;
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uart0.uart_device->ESCR = ESCR_DATABITS_8;
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uart0.uart_device->SCR = SCR_RXE | SCR_TXE | SCR_RIE;
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/* register UART2 device */
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rt_hw_serial_register(&uart0_device,
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"uart0",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
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&uart0);
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#endif
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#ifdef RT_USING_UART2
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/* initialize UART2 */
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/* Set Uart Ch2 Port, SIN2_1, SOT2_1 */
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FM3_GPIO->PFR2 = FM3_GPIO->PFR2 | 0x0030;
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FM3_GPIO->EPFR07 = FM3_GPIO->EPFR07 | 0x000a0000;
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uart2.uart_device->SMR = SMR_MD_UART | SMR_SOE;;
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uart2.uart_device->BGR = (40000000UL + (BPS/2))/BPS - 1;
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uart2.uart_device->ESCR = ESCR_DATABITS_8;
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uart2.uart_device->SCR = SCR_RXE | SCR_TXE | SCR_RIE;
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/* register UART2 device */
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rt_hw_serial_register(&uart2_device,
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"uart2",
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM,
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&uart2);
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#endif
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}
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/*@}*/
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