166 lines
3.9 KiB
C
166 lines
3.9 KiB
C
/*
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Copyright (C) 2014..2016 Marco Veeneman
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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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#define ADC_GRP1_NUM_CHANNELS 2
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#define ADC_GRP1_BUF_DEPTH 8
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#define ADC_GRP2_NUM_CHANNELS 8
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#define ADC_GRP2_BUF_DEPTH 16
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static adcsample_t samples1[ADC_GRP1_NUM_CHANNELS * ADC_GRP1_BUF_DEPTH];
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static adcsample_t samples2[ADC_GRP2_NUM_CHANNELS * ADC_GRP2_BUF_DEPTH];
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/*
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* ADC streaming callback.
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*/
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size_t nx = 0, ny = 0;
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uint32_t temp = 0;
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static void adccallback(ADCDriver *adcp, adcsample_t *buffer, size_t n) {
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(void)adcp;
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if (samples2 == buffer) {
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nx += n;
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uint8_t i, j;
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adcsample_t avg = 0;
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for (j = 0; j < n; j++) {
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for (i = 0; i < ADC_GRP2_NUM_CHANNELS; i++) {
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avg += *buffer++;
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}
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}
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avg /= (n * ADC_GRP2_NUM_CHANNELS);
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temp = (uint32_t)(147.5f - ((75.0f * 3.3f * (float)avg)) / 4096.0f);
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}
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else {
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ny += n;
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uint8_t i, j;
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adcsample_t avg = 0;
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for (j = 0; j < n; j++) {
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for (i = 0; i < ADC_GRP2_NUM_CHANNELS; i++) {
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avg += *buffer++;
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}
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}
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avg /= (n * ADC_GRP2_NUM_CHANNELS);
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temp = (uint32_t)(147.5f - ((75.0f * 3.3f * (float)avg)) / 4096.0f);
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}
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}
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static void adcerrorcallback(ADCDriver *adcp, adcerror_t err) {
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(void)adcp;
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(void)err;
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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 2 channels, Always triggered.
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* Channels: TS, TS.
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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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NULL,
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adcerrorcallback,
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0xF, /* EMUX */ /* Always trigger */
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0, /* SSMUX */
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(1 << 7) | (1 << 5) |
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(1 << 3) /* SSCTL */ /* 2 times TS, 2nd has end bit set */
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};
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/*
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* ADC conversion group.
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* Mode: Continuous, 16 samples of 8 channels, Always triggered.
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* Channels: TS, TS, TS, TS, TS, TS, TS, TS.
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*/
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static const ADCConversionGroup adcgrpcfg2 = {
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TRUE,
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ADC_GRP2_NUM_CHANNELS,
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adccallback,
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adcerrorcallback,
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0xF, /* EMUX */ /* Always trigger */
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0, /* SSMUX */
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(1 << 31) | (1 << 29) |
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(1 << 27) |
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(1 << 23) |
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(1 << 19) |
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(1 << 15) |
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(1 << 11) |
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(1 << 7) |
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(1 << 3) /* SSCTL */ /* 8 times TS, 8th has end bit set */
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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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/*
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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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/* Configure RX and TX pins for UART0.*/
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palSetLineMode(LINE_UART0_RX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
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palSetLineMode(LINE_UART0_TX, PAL_MODE_INPUT | PAL_MODE_ALTERNATE(1));
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sdStart(&SD1, NULL);
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chprintf((BaseSequentialStream *)&SD1, "Starting ADC0...");
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chThdSleepMilliseconds(500);
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/*
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* Activates the ADC0 driver.
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*/
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adcStart(&ADCD1, NULL);
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/*
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* Linear conversion.
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*/
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adcConvert(&ADCD1, &adcgrpcfg1, samples1, ADC_GRP1_BUF_DEPTH);
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/*
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* Starts an ADC continuous conversion.
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*/
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adcStartConversion(&ADCD1, &adcgrpcfg2, samples2, ADC_GRP2_BUF_DEPTH);
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/*
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* Normal main() thread activity
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*/
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while (TRUE) {
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chThdSleepMilliseconds(500);
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chprintf((BaseSequentialStream *)&SD1, "A:%d\tB:%d\ttmp:%d\r\n", nx, ny, temp);
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}
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return 0;
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}
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