162 lines
4.2 KiB
C
162 lines
4.2 KiB
C
/*
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******************************************************************************
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* By : parai
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* email:parai@foxmail.com
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* 这并不是一个真的串口设备，只是为了能够让内核打印信息而创建
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******************************************************************************
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*/
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#include "rtthread.h"
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#define _DEBUG_SERIAL 0
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#include "serial.h"
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#include <stdio.h>
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struct rt_device serial_device;
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extern struct serial_int_rx serial_rx;
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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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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(serial_rx.rx_buffer, 0,
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sizeof(serial_rx.rx_buffer));
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serial_rx.read_index = 0;
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serial_rx.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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static rt_err_t rt_serial_open(rt_device_t dev, rt_uint16_t oflag)
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{
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#if _DEBUG_SERIAL==1
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printf("in rt_serial_open()\n");
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#endif
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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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#if _DEBUG_SERIAL==1
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printf("in rt_serial_close()\n");
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#endif
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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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ptr = buffer;
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err_code = RT_EOK;
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if (dev->flag & RT_DEVICE_FLAG_INT_RX)
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{
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/* interrupt mode Rx */
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while (size)
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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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if (serial_rx.read_index != serial_rx.save_index)
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{
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/* read a character */
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*ptr++ = serial_rx.rx_buffer[serial_rx.read_index];
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size--;
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/* move to next position */
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serial_rx.read_index ++;
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if (serial_rx.read_index >= SERIAL_RX_BUFFER_SIZE)
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serial_rx.read_index = 0;
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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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/* enable interrupt */
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rt_hw_interrupt_enable(level);
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break;
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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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/* 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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#if _DEBUG_SERIAL==1
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printf("in rt_serial_write()\n");
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#endif
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printf("%s", (char *)buffer);
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return size;
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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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static rt_err_t rt_hw_serial_register(rt_device_t device, const char *name, rt_uint32_t flag)
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{
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RT_ASSERT(device != RT_NULL);
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#if _DEBUG_SERIAL==1
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printf("in rt_serial_register()\n");
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#endif
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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 = RT_NULL;
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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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rt_err_t rt_hw_serial_init(void)
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{
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return rt_hw_serial_register(&serial_device, RT_CONSOLE_DEVICE_NAME,
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RT_DEVICE_FLAG_RDWR | RT_DEVICE_FLAG_INT_RX | RT_DEVICE_FLAG_STREAM);
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} |