mirror of
https://github.com/eried/portapack-mayhem.git
synced 2024-10-01 01:26:06 -04:00
61 lines
1.5 KiB
C
Executable File
61 lines
1.5 KiB
C
Executable File
/*
|
|
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
/**
|
|
* TMP75 is most simple I2C device in our case. It is already useful with
|
|
* default settings after powerup.
|
|
* You only must read 2 sequential bytes from it.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
|
|
#include "ch.h"
|
|
#include "hal.h"
|
|
|
|
#include "tmp75.h"
|
|
|
|
|
|
/* input buffer */
|
|
static uint8_t tmp75_rx_data[TMP75_RX_DEPTH];
|
|
|
|
/* temperature value */
|
|
static int16_t temperature = 0;
|
|
|
|
static i2cflags_t errors = 0;
|
|
|
|
#define tmp75_addr 0b1001000
|
|
|
|
/* This is main function. */
|
|
void request_temperature(void){
|
|
int16_t t_int = 0, t_frac = 0;
|
|
msg_t status = RDY_OK;
|
|
systime_t tmo = MS2ST(4);
|
|
|
|
i2cAcquireBus(&I2CD1);
|
|
status = i2cMasterReceiveTimeout(&I2CD1, tmp75_addr, tmp75_rx_data, 2, tmo);
|
|
i2cReleaseBus(&I2CD1);
|
|
|
|
if (status != RDY_OK){
|
|
errors = i2cGetErrors(&I2CD1);
|
|
}
|
|
|
|
t_int = tmp75_rx_data[0] * 100;
|
|
t_frac = (tmp75_rx_data[1] * 100) >> 8;
|
|
temperature = t_int + t_frac;
|
|
}
|
|
|
|
|