131 lines
3.5 KiB
C
131 lines
3.5 KiB
C
#include <rtthread.h>
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#include <windows.h>
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#include <mmsystem.h>
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#include <stdio.h>
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#include "serial.h"
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struct serial_int_rx serial_rx;
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extern struct rt_device serial_device;
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/*
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* Handler for OSKey Thread
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*/
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static HANDLE OSKey_Thread;
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static DWORD OSKey_ThreadID;
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static DWORD WINAPI ThreadforKeyGet(LPVOID lpParam);
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void rt_hw_usart_init(void)
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{
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/*
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* create serial thread that receive key input from keyboard
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*/
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OSKey_Thread = CreateThread(NULL,
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0,
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(LPTHREAD_START_ROUTINE)ThreadforKeyGet,
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0,
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CREATE_SUSPENDED,
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&OSKey_ThreadID);
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if (OSKey_Thread == NULL)
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{
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//Display Error Message
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return;
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}
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SetThreadPriority(OSKey_Thread,
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THREAD_PRIORITY_NORMAL);
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SetThreadPriorityBoost(OSKey_Thread,
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TRUE);
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SetThreadAffinityMask(OSKey_Thread,
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0x01);
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/*
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* Start OS get key Thread
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*/
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ResumeThread(OSKey_Thread);
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}
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/*
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* 方向键(←)： 0xe04b
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* 方向键(↑)： 0xe048
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* 方向键(→)： 0xe04d
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* 方向键(↓)： 0xe050
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*/
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static int savekey(unsigned char key)
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{
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/* save on rx buffer */
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{
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rt_base_t level;
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/* disable interrupt */
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//暂时关闭中断，因为要操作uart数据结构
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level = rt_hw_interrupt_disable();
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/* save character */
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serial_rx.rx_buffer[serial_rx.save_index] = key;
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serial_rx.save_index ++;
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//下面的代码检查save_index是否已经到到缓冲区尾部，如果是则回转到头部，称为一个环形缓冲区
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if (serial_rx.save_index >= SERIAL_RX_BUFFER_SIZE)
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serial_rx.save_index = 0;
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//这种情况表示反转后的save_index追上了read_index，则增大read_index，丢弃一个旧的数据
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/* if the next position is read index, discard this 'read char' */
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if (serial_rx.save_index == serial_rx.read_index)
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{
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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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/* enable interrupt */
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//uart数据结构已经操作完成，重新使能中断
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rt_hw_interrupt_enable(level);
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}
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/* invoke callback */
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if (serial_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 = serial_rx.read_index > serial_rx.save_index ?
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SERIAL_RX_BUFFER_SIZE - serial_rx.read_index + serial_rx.save_index :
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serial_rx.save_index - serial_rx.read_index;
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serial_device.rx_indicate(&serial_device, rx_length);
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}
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return 0;
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}
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static DWORD WINAPI ThreadforKeyGet(LPVOID lpParam)
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{
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unsigned char key;
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(void)lpParam; //prevent compiler warnings
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for (;;)
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{
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key = _getch();//getchar();
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if (key == 0xE0)
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{
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key = _getch();
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if (key == 0x48) //up key , 0x1b 0x5b 0x41
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{
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savekey(0x1b);
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savekey(0x5b);
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savekey(0x41);
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}
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else if (key == 0x50)//0x1b 0x5b 0x42
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{
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savekey(0x1b);
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savekey(0x5b);
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savekey(0x42);
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}
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continue;
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}
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savekey(key);
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}
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} /*** ThreadforKeyGet ***/ |