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();
}
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你给的函数也是TIM2_TimeBaseInit(TIM2_PRESCALER_64, 0xFFFF); 64分频的
没看清你这接收多少帧数据才算成功呢?很多都是接收完二帧数据并二次的数据对比是否一样如果一样才当解码成功
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