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- #include "am2303.h"
- #include "dwt.h"
- void am2303_rst(void)
- {
- AM2303_IO_OUT;
- AM2303_DO_LOW;
- ms_delay(20);
- AM2303_DO_HIGH;
- us_delay(30);
- }
- INT8U am2303_check(void)
- {
- INT8U retry = 0;
- AM2303_IO_IN;
- while ((GPIO_ReadInputDataBit(AM2303_PORT, AM2303_PIN) == 1) && retry < 100)
- {
- retry++;
- us_delay(1);
- };
- if (retry >= 100)
- return 1;
- else
- retry = 0;
- while ((GPIO_ReadInputDataBit(AM2303_PORT, AM2303_PIN) == 0) && retry < 100)
- {
- retry++;
- us_delay(1);
- };
- if (retry >= 100)
- return 1;
- return 0;
- }
- INT8U am2303_read_bit(void)
- {
- INT8U retry = 0;
- while ((GPIO_ReadInputDataBit(AM2303_PORT, AM2303_PIN) == 1) && retry < 100)
- {
- retry++;
- us_delay(1);
- }
- retry = 0;
- while ((GPIO_ReadInputDataBit(AM2303_PORT, AM2303_PIN) == 0) && retry < 100)
- {
- retry++;
- us_delay(1);
- }
- us_delay(40);
- if (GPIO_ReadInputDataBit(AM2303_PORT, AM2303_PIN) == 1)
- return 1;
- else
- return 0;
- }
- INT8U am2303_read_byte(void)
- {
- INT8U i, dat;
- dat = 0;
- for (i = 0; i < 8; i++)
- {
- dat <<= 1;
- dat |= am2303_read_bit();
- }
- return dat;
- }
- INT8U am2303_read_data(INT8U *temp, INT8U *humi)
- {
- INT8U buf[5];
- INT8U i;
- INT8U k;
-
-
- AM2303_DO_LOW;
- ms_delay(20);
- AM2303_DO_HIGH;
- us_delay(15);
-
- for (k = 0; k < 10; k++)
- {
- if (DQ_IS_LOW())
- {
- break;
- }
- us_delay(10);
- }
- if (k >= 10)
- {
- goto quit;
- }
-
- for (k = 0; k < 10; k++)
- {
- if (!DQ_IS_LOW())
- {
- break;
- }
- us_delay(10);
- }
- if (k >= 10)
- {
- goto quit;
- }
-
- for (k = 0; k < 10; k++)
- {
- if (DQ_IS_LOW())
- {
- break;
- }
- us_delay(10);
- }
- if (k >= 10)
- {
- goto quit;
- }
-
- for (i = 0; i < 5; i++)
- {
- buf[i] = DHT11_ReadByte();
- }
- us_delay(100);
- if ((buf[0] + buf[1] + buf[2] + buf[3]) == buf[4])
- {
- *humi = buf[0];
- *temp = buf[2];
- return 1;
- }
- quit:
- return 0;
- }
- #if 0
- INT8U am2303_init(void)
- {
- am2303_rst();
- return am2303_check();
- }
- #else
- INT8U am2303_init(void)
- {
- AM2303_DO_LOW;
- }
- #endif
- uint8_t DHT11_ReadByte(void)
- {
-
- uint8_t i, k;
- uint8_t read = 0;
- for (i = 0; i < 8; i++)
- {
- read <<= 1;
-
- for (k = 0; k < 10; k++)
- {
- if (!DQ_IS_LOW())
- {
- break;
- }
- us_delay(10);
- }
- if (k >= 10)
- {
- goto quit;
- }
-
- for (k = 0; k < 10; k++)
- {
- if (DQ_IS_LOW())
- {
- break;
- }
- us_delay(10);
- }
- if (k > 3)
- {
- read++;
- }
- }
- return read;
- quit:
- return 0xFF;
- }
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