314 lines
6.7 KiB
C
314 lines
6.7 KiB
C
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/*
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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://openlab.rt-thread.com/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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* 2009-04-20 yi.qiu modified according bernard's stm32 version
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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 S3C24X0
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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->private;
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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->read_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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/**
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* This function read a character from serial without interrupt enable mode
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*
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* @return the read char
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*/
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char rt_serial_getc(struct serial_device* uart)
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{
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rt_base_t level;
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char ch = 0;
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/* disable interrupt */
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level = rt_hw_interrupt_disable();
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if (uart->int_rx->read_index != uart->int_rx->save_index)
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{
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ch = uart->int_rx->rx_buffer[uart->int_rx->read_index];
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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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return ch;
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}
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/* save a char to serial buffer */
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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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/**
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* This function will write a character to serial without interrupt enable mode
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*
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* @param c the char to write
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*/
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void rt_serial_putc(rt_device_t device, const char c)
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{
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struct serial_device* uart = (struct serial_device*) device->private;
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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 (c=='\n' && (device->flag & RT_DEVICE_FLAG_STREAM))
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rt_serial_putc(device, '\r');
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while (!(uart->uart_device->ustat & USTAT_TXB_EMPTY));
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uart->uart_device->utxh = (c & 0x1FF);
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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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RT_ASSERT(dev != RT_NULL);
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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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RT_ASSERT(dev != RT_NULL);
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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, 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->private;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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rt_int32_t ch;
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/* interrupt mode Rx */
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while (size)
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{
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/* get a character */
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ch = rt_serial_getc(uart);
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if (ch < 0)
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{
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/* set error code */
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err_code = -RT_EEMPTY;
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}
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else
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{
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*ptr++ = ch;
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size --;
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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->ustat & USTAT_RCV_READY)
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{
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*ptr = uart->uart_device->urxh & 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, 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->private;
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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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rt_serial_putc(dev, *ptr);
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++ptr; --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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struct serial_device* uart;
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RT_ASSERT(dev != RT_NULL);
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uart = (struct serial_device*)dev->private;
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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, 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->private = 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->private;
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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->ustat & USTAT_RCV_READY)
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{
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rt_serial_savechar(uart, uart->uart_device->urxh & 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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/*@}*/
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