53 lines
1.2 KiB
C
53 lines
1.2 KiB
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 i2cblock_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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/* Simple error trap */
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static void i2c_tmp75_error_cb(I2CDriver *i2cp, const I2CSlaveConfig *i2cscfg){
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(void)i2cscfg;
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int status = 0;
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status = i2cp->id_i2c->SR1;
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while(TRUE);
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}
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/* This callback raise up when transfer finished */
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static void i2c_tmp75_cb(I2CDriver *i2cp, const I2CSlaveConfig *i2cscfg){
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(void)*i2cp;
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(void)*i2cscfg;
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/* store temperature value */
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}
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/* Fill TMP75 config. */
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static const I2CSlaveConfig tmp75 = {
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i2c_tmp75_cb,
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i2c_tmp75_error_cb,
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};
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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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i2cAcquireBus(&I2CD2);
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i2cMasterReceive(&I2CD2, &tmp75, tmp75_addr, tmp75_rx_data, 2);
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i2cReleaseBus(&I2CD2);
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temperature = (tmp75_rx_data[0] << 8) + tmp75_rx_data[1];
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}
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