38 lines
751 B
C
38 lines
751 B
C
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/**
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* TMP75 is most simple I2C device in our case. It is already useful with
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* default settings after powerup.
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* You only must read 2 sequential bytes from it.
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*/
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#include <stdlib.h>
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#include "ch.h"
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#include "hal.h"
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#include "tmp75.h"
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/* input buffer */
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static uint8_t tmp75_rx_data[TMP75_RX_DEPTH];
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/* temperature value */
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static int16_t temperature = 0;
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#define tmp75_addr 0b1001000
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/* This is main function. */
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void request_temperature(void){
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int16_t t_int = 0, t_frac = 0;
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i2cAcquireBus(&I2CD1);
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i2cMasterReceive(&I2CD1, tmp75_addr, tmp75_rx_data, 2);
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i2cReleaseBus(&I2CD1);
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t_int = tmp75_rx_data[0] * 100;
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t_frac = (tmp75_rx_data[1] * 100) >> 8;
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temperature = t_int + t_frac;
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}
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