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NecIR.cpp
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NecIR.cpp
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#include "pxt.h"
//% color=50 weight=80
//% icon="\uf1eb"
namespace maqueenIRV2 {
int ir_code = 0x00;
int ir_addr = 0x00;
int data;
int logic_value(){//判断逻辑值"0"和"1"子函数
uint32_t lasttime = system_timer_current_time_us();
uint32_t nowtime;
while(!uBit.io.P16.getDigitalValue());//低等待
nowtime = system_timer_current_time_us();
if((nowtime - lasttime) > 400 && (nowtime - lasttime) < 700){//低电平560us
while(uBit.io.P16.getDigitalValue());//是高就等待
lasttime = system_timer_current_time_us();
if((lasttime - nowtime)>400 && (lasttime - nowtime) < 700){//接着高电平560us
return 0;
}else if((lasttime - nowtime)>1500 && (lasttime - nowtime) < 1800){//接着高电平1.7ms
return 1;
}
}
uBit.serial.printf("error\r\n");
return -1;
}
void pulse_deal(){
int i;
ir_addr=0x00;//清零
for(i=0; i<16;i++ )
{
if(logic_value() == 1)
{
ir_addr |=(1<<i);
}
}
//解析遥控器编码中的command指令
ir_code=0x00;//清零
for(i=0; i<16;i++ )
{
if(logic_value() == 1)
{
ir_code |=(1<<i);
}
}
}
void remote_decode(void){
data = 0x00;
uint32_t lasttime = system_timer_current_time_us();
uint32_t nowtime;
while(uBit.io.P16.getDigitalValue()){//高电平等待
nowtime = system_timer_current_time_us();
if((nowtime - lasttime) > 100000){//超过100 ms,表明此时没有按键按下
ir_code = 0xff00;
return;
}
}
//如果高电平持续时间不超过100ms
lasttime = system_timer_current_time_us();
while(!uBit.io.P16.getDigitalValue());//低等待
nowtime = system_timer_current_time_us();
if((nowtime - lasttime) < 10000 && (nowtime - lasttime) > 8000){//9ms
while(uBit.io.P16.getDigitalValue());//高等待
lasttime = system_timer_current_time_us();
if((lasttime - nowtime) > 4000 && (lasttime - nowtime) < 5000){//4.5ms,接收到了红外协议头且是新发送的数据。开始解析逻辑0和1
pulse_deal();
//uBit.serial.printf("addr=0x%X,code = 0x%X\r\n",ir_addr,ir_code);
data = ir_code;
return;//ir_code;
}else if((lasttime - nowtime) > 2000 && (lasttime - nowtime) < 2500){//2.25ms,表示发的跟上一个包一致
while(!uBit.io.P16.getDigitalValue());//低等待
nowtime = system_timer_current_time_us();
if((nowtime - lasttime) > 500 && (nowtime - lasttime) < 700){//560us
//uBit.serial.printf("addr=0x%X,code = 0x%X\r\n",ir_addr,ir_code);
data = ir_code;
return;//ir_code;
}
}
}
}
//%
int irCode(){
remote_decode();
return data;
}
//%
int readPulseIn(int status){
uint32_t lasttime,nowtime,temp;
if(status == 1){//HIGH
lasttime = system_timer_current_time_us();
while(!uBit.io.P2.getDigitalValue()){
temp = system_timer_current_time_us();
if((temp - lasttime) > 70000){
//uBit.serial.printf("time out 0 %d\r\n",(temp-lasttime));
return -1;
}
}
lasttime = system_timer_current_time_us();
while(uBit.io.P2.getDigitalValue()){
if((system_timer_current_time_us() - lasttime) > 70000){
//uBit.serial.printf("time out 1");
return -1;
}
}
nowtime = system_timer_current_time_us();
}else{//LOW
while(uBit.io.P2.getDigitalValue()){
if((system_timer_current_time_us() - lasttime) > 70000){
//uBit.serial.printf("time out 3");
return -1;
}
}
lasttime = system_timer_current_time_us();
while(!uBit.io.P2.getDigitalValue()){
if((system_timer_current_time_us() - lasttime) > 70000){
//uBit.serial.printf("time out 4");
return -1;
}
}
nowtime = system_timer_current_time_us();
}
return (nowtime - lasttime);
}
}