24 lines
797 B
C
24 lines
797 B
C
#include "inc/aht.h"
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#include "hardware/i2c.h"
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#include "pico/stdlib.h" // IWYU pragma: keep
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static const uint8_t AHT_MEASURE[3] = {0xAC, 0x33, 0x00};
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void getAHTData(i2c_inst_t *i2c, double *t, double *h) {
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uint8_t result[6];
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uint32_t temperature;
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uint32_t humidity;
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i2c_write_blocking(i2c, AHT_ADDR, AHT_MEASURE, 3,
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false); // trigger measurement
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// now we must delay ~100ms
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sleep_ms(100);
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i2c_read_blocking(i2c, AHT_ADDR, result, 6,
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false); // read 6 bytes back
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humidity = (result[1] << 12) | (result[2] << 4) | (result[3] & 0xF0) >> 4;
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temperature = (result[3] & 0x0F) << 16 | (result[4] << 8) | result[5];
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*t = (((double)temperature / 1048576.0f) * 200.0f) - 50.0f;
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*h = ((double)humidity / 1048576.0f) * 100.0f;
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return;
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}
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