133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
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ChibiOS - Copyright (C) 2014 Derek Mulcahy
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "ch.h"
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#include "hal.h"
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#define ADC_GRP1_NUM_CHANNELS 2
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#define ADC_GRP1_BUF_DEPTH 1
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static adcsample_t samples1[ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH];
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static void adc_end_cb(ADCDriver *adcp, adcsample_t *buffer, size_t n) {
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(void)adcp;
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(void)n;
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/*
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* The bandgap value represents the ADC reading for 1.0V
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*/
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uint16_t sensor = buffer[0];
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uint16_t bandgap = buffer[1];
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/*
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* The v25 value is the voltage reading at 25C, it comes from the ADC
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* electricals table in the processor manual. V25 is in millivolts.
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*/
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int32_t v25 = 716;
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/*
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* The m value is slope of the temperature sensor values, again from
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* the ADC electricals table in the processor manual.
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* M in microvolts per degree.
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*/
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int32_t m = 1620;
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/*
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* Divide the temperature sensor reading by the bandgap to get
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* the voltage for the ambient temperature in millivolts.
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*/
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int32_t vamb = (sensor * 1000) / bandgap;
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/*
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* This formula comes from the reference manual.
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* Temperature is in millidegrees C.
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*/
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int32_t delta = (((vamb - v25) * 1000000) / m);
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int32_t temp = 25000 - delta;
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if (temp < 19000) {
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/* Turn just the Blue LED on if less than 19C */
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palSetPad(GPIOB,18); // Red
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palSetPad(GPIOB,19); // Green
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palClearPad(GPIOD,1); // Blue
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} else if (temp > 28000) {
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/* Turn just the Red LED on if greater than 28C */
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palClearPad(GPIOB,18); // Red
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palSetPad(GPIOB,19); // Green
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palSetPad(GPIOD,1); // Blue
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} else {
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/* Turn just the Green LED on if between 19C and 28C */
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palSetPad(GPIOB,18); // Red
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palClearPad(GPIOB,19); // Green
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palSetPad(GPIOD,1); // Blue
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}
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}
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/*
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* ADC conversion group.
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* Mode: Linear buffer, 8 samples of 1 channel, SW triggered.
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*/
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static const ADCConversionGroup adcgrpcfg1 = {
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false,
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ADC_GRP1_NUM_CHANNELS,
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adc_end_cb,
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NULL,
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ADC_TEMP_SENSOR | ADC_BANDGAP,
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/* CFG1 Regiser - ADCCLK = SYSCLK / 16, 16 bits per sample */
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ADCx_CFG1_ADIV(ADCx_CFG1_ADIV_DIV_8) |
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ADCx_CFG1_ADICLK(ADCx_CFG1_ADIVCLK_BUS_CLOCK_DIV_2) |
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ADCx_CFG1_MODE(ADCx_CFG1_MODE_16_BITS),
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/* SC3 Register - Average 32 readings per sample */
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ADCx_SC3_AVGE |
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ADCx_SC3_AVGS(ADCx_SC3_AVGS_AVERAGE_32_SAMPLES)
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};
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static const ADCConfig adccfg1 = {
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/* Perform initial calibration */
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true
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};
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/*
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* Application entry point.
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*/
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int main(void) {
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/*
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* System initializations.
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* - HAL initialization, this also initializes the configured device drivers
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* and performs the board-specific initializations.
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* - Kernel initialization, the main() function becomes a thread and the
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* RTOS is active.
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*/
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halInit();
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chSysInit();
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/*
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* Activates the ADC1 driver.
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*/
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adcStart(&ADCD1, &adccfg1);
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while (1) {
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/*
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* ADC linear conversion.
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*/
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adcConvert(&ADCD1, &adcgrpcfg1, samples1, ADC_GRP1_BUF_DEPTH);
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chThdSleepMilliseconds(500);
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}
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}
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