EV1527解码，我也贡献一个，抗干扰，自适应, 经测试比买的解码成功率高，具体多少没计算，通过示波器看到；

/*

中断处理函数 、每次中断查询一下电平；

手册16个CLK(一个数据位)的时间是

最大4.24ms(4240us)/16= 265us; 最小230us/16=14us; 分频时间是4us；

；

同步头高电平至少4个时钟；识别同步头分2步

第一步高电平时间大于等于40us，小于265*4*1.2 = 1060*1.2=1270us；

第二步 低电平时间是高电平时间的31倍，留20%余量26倍-36倍之间；

计算电平时间 (高电平时间 + 低电平时间) / 32 ;

数据宽时间要在这个数值的 正负20% 之间

*/

INTERRUPT_HANDLER(EXTI_PORTA_IRQHandler, 3)

{

static U16 data_h_time;  //

static U16 data_l_time;  //

static U16  bit_time_min;

static U16  bit_time_max;

static U8  decode_KEY;

static U32 decode_ID;

U16 temp;

static U8  ev1527_rx_last;

U16 ev1527_new_time;

disableInterrupts();

ev1527_new_time  = (uint16_t)TIM2->CNTRH << 8;

ev1527_new_time |= (uint16_t)(TIM2->CNTRL);

if(EV1527_RX)  //接收编码高电平

{

if(ev1527_rx_last==0)   //上次是低电平，有跳变

{

EV1527_COUNT_CLEAR;

if(ev1527_decode_state>sync_h)

{

str_ev1527_data.l_data[str_ev1527_data.l_data_write] = ev1527_new_time;

str_ev1527_data.l_data_write = (str_ev1527_data.l_data_write + 1) % EV1527_DATA_TIME_NUM;

switch(ev1527_decode_state)

{

case  sync_l:{

temp = str_ev1527_data.l_data[str_ev1527_data.l_data_read] / str_ev1527_data.h_data[str_ev1527_data.h_data_read];

if((temp >= SYNC_RATIO_MIN) && (temp <= SYNC_RATIO_MAX))

{

temp = str_ev1527_data.l_data[str_ev1527_data.l_data_read] + str_ev1527_data.h_data[str_ev1527_data.h_data_read];

str_ev1527_data.h_data_read = (str_ev1527_data.h_data_read + 1) % EV1527_DATA_TIME_NUM;

str_ev1527_data.l_data_read = (str_ev1527_data.l_data_read + 1) % EV1527_DATA_TIME_NUM;

bit_time_min = temp / 9;

bit_time_max = temp / 7;

decode_ID = 0;

decode_KEY = 0;

data_h_time = 0;

data_l_time = 0;

ev1527_decode_state = chipid_0l;

}

else

{

ev1527_decode_state = sync_h;

}

}break;

case  chipid_0l:

case  chipid_1l:

case  chipid_2l:

case  chipid_3l:

case  chipid_4l:

case  chipid_5l:

case  chipid_6l:

case  chipid_7l:

case  chipid_8l:

case  chipid_9l:

case  chipid_10l:

case  chipid_11l:

case  chipid_12l:

case  chipid_13l:

case  chipid_14l:

case  chipid_15l:

case  chipid_16l:

case  chipid_17l:

case  chipid_18l:

case  chipid_19l:

{

data_h_time += str_ev1527_data.h_data[str_ev1527_data.h_data_read];

data_l_time += str_ev1527_data.l_data[str_ev1527_data.l_data_read];

str_ev1527_data.l_data_read = (str_ev1527_data.l_data_read + 1) % EV1527_DATA_TIME_NUM;

str_ev1527_data.h_data_read = (str_ev1527_data.h_data_read + 1) % EV1527_DATA_TIME_NUM;

temp = data_h_time + data_l_time;

if(temp >= bit_time_min)

{

if(temp <= bit_time_max)

{

if(data_h_time > data_l_time)

{

decode_ID |= 0x01;

}

decode_ID <<= 1;

ev1527_decode_state++;

data_h_time = 0;

data_l_time = 0;

}

else

{

ev1527_decode_state = sync_h;

}

}

}break;

case  data_0l:

case  data_1l:

case  data_2l:

case  data_3l:

{

data_h_time += str_ev1527_data.h_data[str_ev1527_data.h_data_read];

data_l_time += str_ev1527_data.l_data[str_ev1527_data.l_data_read];

str_ev1527_data.l_data_read = (str_ev1527_data.l_data_read + 1) % EV1527_DATA_TIME_NUM;

str_ev1527_data.h_data_read = (str_ev1527_data.h_data_read + 1) % EV1527_DATA_TIME_NUM;

temp = data_h_time + data_l_time;

if(temp >= bit_time_min)

{

if(temp <= bit_time_max)

{

if(data_h_time > data_l_time)

{

decode_KEY |= 0x08;

}

if(ev1527_decode_state == data_3l)

{

ev1527_chip_ID = decode_ID;

ev1527_chip_key  = decode_KEY;

ev1527_new_sms = 1;

LED_ON(LED_01);

ev1527_decode_state = sync_h;

}

else

{

decode_KEY >>= 1;

ev1527_decode_state++;

}

data_h_time = 0;

data_l_time = 0;

}

else

{

ev1527_decode_state = sync_h;

}

}

}break;

}

}

}

ev1527_rx_last = 1;

}

else        //接收编码低电平

{

if(ev1527_rx_last)   //上次是高电平，有跳变

{

EV1527_COUNT_CLEAR;

if(ev1527_decode_state == sync_h)

{

if((ev1527_new_time >= SYNC_H_TIME_MIN) && (ev1527_new_time <= SYNC_H_TIME_MAX))

{

str_ev1527_data.l_data_read = str_ev1527_data.l_data_write=0;

str_ev1527_data.h_data_read = str_ev1527_data.h_data_write=0;

str_ev1527_data.h_data[str_ev1527_data.h_data_write] = ev1527_new_time;

str_ev1527_data.h_data_write = (str_ev1527_data.h_data_write + 1) % EV1527_DATA_TIME_NUM;

ev1527_decode_state  = sync_l;

}

}

else

{

str_ev1527_data.h_data[str_ev1527_data.h_data_write] = ev1527_new_time;

str_ev1527_data.h_data_write = (str_ev1527_data.h_data_write + 1) % EV1527_DATA_TIME_NUM;

}

}

ev1527_rx_last = 0;

}

enableInterrupts();

}