int JSON_RPC(read)(jsmn_node_t* pjn, fp_json_delegate_ack ack, void* ctx) //继承于fp_json_delegate_start
{
int ret = STATE_OK;
char* err_msg = NULL;
LOG_INFO("DELEGATE dht11.read.\r\n");
/*
{
"method":"dht11.read",
"params":{}
}
*/
//----温度高8位== U8T_data_H------
//----温度低8位== U8T_data_L------
//----湿度高8位== U8RH_data_H-----
//----湿度低8位== U8RH_data_L-----
//----校验 8位 == U8checkdata-----
u8_t temp_h, temp_l, humi_h, humi_l, chk;
if(STATE_OK != (ret = dht11_start()) ||
STATE_OK != (ret = dht11_read_byte(&humi_h))||
STATE_OK != (ret = dht11_read_byte(&humi_l))||
STATE_OK != (ret = dht11_read_byte(&temp_h))||
STATE_OK != (ret = dht11_read_byte(&temp_l))||
STATE_OK != (ret = dht11_read_byte(&chk)))
{}
dht11_stop();
if(STATE_OK != ret){
err_msg = "read time out.";
LOG_WARN("dht11:%s %d.\r\n", err_msg, ret);
goto exit_err;
}
if(chk != temp_h+temp_l+humi_h+humi_l){
ret = STATE_ERROR;
err_msg = "checksum err.";
LOG_WARN("dht11:%s.\r\n", err_msg);
goto exit_err;
}
if(ack){
char json[128];
u32_t n = 0;
n += _snprintf(json+n, sizeof(json)-n, "{\"result\":{\"temperature\":%u.%u,\"humidity\":%u.%u}}",temp_h, temp_l, humi_h, humi_l);
jsmn_node_t jn = {json, n, NULL};
ack(&jn, ctx); //这里对json请求 回应json
}
return ret;
//exit_safe:
if(ack)
jsmn.delegate_ack_result(ack, ctx, ret);
return ret;
exit_err:
if(ack)
jsmn.delegate_ack_err(ack, ctx, ret, err_msg);
return ret;
}
int8_t dht_getdata(int16_t *temperature, int16_t *humidity) {
#endif
uint8_t bits[5];
uint8_t i,j = 0;
if(!RT_IO_ENABLED(IO_DHT)) return -1;
memset(bits, 0, sizeof(bits));
#if 1
dht11_start();
#else
//reset port
DHT_DDR |= (1<<DHT_INPUTPIN); //output
DHT_PORT |= (1<<DHT_INPUTPIN); //high
_delay_ms(100);
//send request
DHT_PORT &= ~(1<<DHT_INPUTPIN); //low
#if DHT_TYPE == DHT_DHT11
//_delay_ms(18);
_delay_ms(20);
#elif DHT_TYPE == DHT_DHT22
_delay_us(500);
#endif
DHT_PORT |= (1<<DHT_INPUTPIN); //high
DHT_DDR &= ~(1<<DHT_INPUTPIN); //input
_delay_us(40);
//_delay_us(70);
#endif
#if 0
if(dht11_check_response()) return -1;
#else
//check start condition 1
if((DHT_PIN & (1<<DHT_INPUTPIN))) {
DPUTS("no start condition 1");
return -1;
}
_delay_us(80);
//check start condition 2
if(!(DHT_PIN & (1<<DHT_INPUTPIN))) {
DPUTS("no start condition 2");
return -1;
}
_delay_us(80);
//_delay_us(40);
#endif
//read the data
uint16_t timeoutcounter = 0;
for (j=0; j<5; j++) { //read 5 byte
uint8_t result=0;
for(i=0; i<8; i++) {//read every bit
timeoutcounter = 0;
while(!(DHT_PIN & (1<<DHT_INPUTPIN))) { //wait for an high input (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT_TIMEOUT) {
DPUTS("tmo 1");
return -1; //timeout
}
}
_delay_us(30);
if(DHT_PIN & (1<<DHT_INPUTPIN)) //if input is high after 30 us, get result
result |= (1<<(7-i));
timeoutcounter = 0;
while(DHT_PIN & (1<<DHT_INPUTPIN)) { //wait until input get low (non blocking)
timeoutcounter++;
if(timeoutcounter > DHT_TIMEOUT) {
DPUTS("tmo 2");
return -1; //timeout
}
}
}
bits[j] = result;
}
#if 1
// reset port
DHT_DDR |= (1<<DHT_INPUTPIN); //output
DHT_PORT |= (1<<DHT_INPUTPIN); //low
_delay_ms(100);
#endif
// check checksum
if((uint8_t)(bits[0] + bits[1] + bits[2] + bits[3]) != bits[4])
{
DPUTS("checksum");
return -1;
}
// return temperature and humidity
#if DHT_TYPE == DHT_DHT11
*temperature = bits[2];
*humidity = bits[0];
#elif DHT_TYPE == DHT_DHT22
uint16_t rawhumidity = bits[0]<<8 | bits[1];
uint16_t rawtemperature = bits[2]<<8 | bits[3];
if(rawtemperature & 0x8000) {
*temperature = (float)((rawtemperature & 0x7FFF) / 10.0) * -1.0;
} else {
*temperature = (float)(rawtemperature)/10.0;
}
*humidity = (float)(rawhumidity)/10.0;
#endif
return 0;
}
