124 lines
3.3 KiB
C
124 lines
3.3 KiB
C
/*
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ChibiOS - Copyright (C) 2016 Theodore Ateba
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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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#include "chprintf.h"
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/*
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* In this demo we use a single channel to sample voltage across
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* a potentiometer.
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*/
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#define MY_NUM_CH 1
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#define MY_SAMPLING_NUMBER 10
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/**
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* @brief Global variables
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*/
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BaseSequentialStream * chp = (BaseSequentialStream *) &SD1;
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static int32_t adcConvA0 = 0; /**< A0 adc conversion. */
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static float voltageA0 = 0; /**< A0 voltage. */
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static adcsample_t sample_buff[MY_NUM_CH * MY_SAMPLING_NUMBER];
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/*
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* ADC conversion group.
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* Mode: Linear buffer, 10 samples of 1 channel, SW triggered.
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* Channels: IN0 (Arduino Pin A0).
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*/
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static const ADCConversionGroup my_conversion_group = {
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FALSE, /* Not circular buffer. */
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MY_NUM_CH, /* Number of channels. */
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NULL, /* No ADC callback function. */
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1, /* Channel mask. */
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};
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static const ADCConfig adcConfig = {
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ANALOG_REFERENCE_AVCC, /* Analog reference. */
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};
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static THD_WORKING_AREA(waThd1, 32);
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static THD_FUNCTION(Thd1, arg) {
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(void) arg;
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chRegSetThreadName("LED Thread");
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while (true) {
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palTogglePad(IOPORT2, PORTB_LED1);
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chThdSleepMilliseconds(1000);
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}
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}
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static THD_WORKING_AREA(waThd2, 512);
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static THD_FUNCTION(Thd2, arg) {
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unsigned i;
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(void) arg;
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chRegSetThreadName("ADC1 Thread");
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/* Activates the ADC1 driver. */
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adcStart(&ADCD1, &adcConfig);
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while (TRUE) {
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/* Make ADC conversion of the voltage on A0. */
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adcConvert(&ADCD1, &my_conversion_group, sample_buff, MY_SAMPLING_NUMBER);
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/* Making mean of sampled values.*/
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for (i = 0; i < MY_NUM_CH * MY_SAMPLING_NUMBER; i++) {
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adcConvA0 += sample_buff[i];
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}
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adcConvA0 /= (MY_NUM_CH * MY_SAMPLING_NUMBER);
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voltageA0 = (((float)adcConvA0 * 5) / 1024);
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}
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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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* Initialized the serial driver an turn off the onboard debug led.
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*/
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sdStart(&SD1, NULL);
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palClearPad(IOPORT2, PORTB_LED1);
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/*
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* Starts the LED blinker thread.
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*/
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chThdCreateStatic(waThd1, sizeof(waThd1), NORMALPRIO + 1, Thd1, NULL);
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chThdCreateStatic(waThd2, sizeof(waThd2), NORMALPRIO + 1, Thd2, NULL);
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chprintf(chp, "AVR ADC program example... \r\n");
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while (TRUE) {
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chprintf(chp, "Measure the voltage on A0 pin: \r\n");
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chprintf(chp, " %.3fv \r\n", voltageA0);
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chThdSleepMilliseconds(100);
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chprintf(chp, "\033[2J\033[1;1H");
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}
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}
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