mirror of https://github.com/rusefi/ChibiOS.git
73 lines
1.6 KiB
C
73 lines
1.6 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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static i2cblock_t tmp75_tx_data[TMP75_TX_DEPTH];
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// Simple error trap
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static void i2c_tmp75_error_cb(I2CDriver *i2cp, 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, I2CSlaveConfig *i2cscfg){
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int16_t temperature = 0;
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/* Manually send stop signal to the bus. This is important! */
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i2cMasterStop(i2cp);
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/* unlock bus */
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i2cReleaseBus(&I2CD2);
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/* store temperature value */
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temperature = (i2cscfg->rxbuf[0] << 8) + i2cscfg->rxbuf[1];
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}
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// Fill TMP75 config.
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static I2CSlaveConfig tmp75 = {
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i2c_tmp75_cb,
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i2c_tmp75_error_cb,
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tmp75_rx_data,
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TMP75_RX_DEPTH,
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0,
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0,
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tmp75_tx_data,
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TMP75_TX_DEPTH,
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0,
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0,
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0b1001000,
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FALSE,
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};
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/* This is main function. */
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void request_temperature(void){
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tmp75.txbytes = 0; // set to zero just to be safe
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/* tune receiving buffer */
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tmp75.rxbufhead = 0;// point to beginig of buffer
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tmp75.rxbytes = 2; // we need read 2 bytes
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/* get exclusive access to the bus */
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i2cAcquireBus(&I2CD2);
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/* start receiving process in background and return */
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i2cMasterReceive(&I2CD2, &tmp75);
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}
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