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63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
/*
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* adc.c - functions for Sharp 2Y0A02 distance meter & photosensor
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*
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* Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#include "adc.h"
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#include "main.h"
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#include "usbkeybrd.h"
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uint16_t ADC_value; // Value of ADC
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uint16_t ADC_trig_val; // -//- at trigger time
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void init_adc_sensor(){
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// we will use ADC1 channel 0 for IR sensor & ADC1 channel 1 for laser's photoresistor
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// Make sure the ADC doesn't run during config
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adc_off(ADC1);
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// enable ADC & PA0/PA1 clocking
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN | RCC_APB2ENR_IOPAEN);
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rcc_set_adcpre(RCC_CFGR_ADCPRE_PCLK2_DIV4);
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gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO6);
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rcc_periph_clock_enable(RCC_DMA1); // enable DMA for ADC values storing
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// Configure ADC as continuous scan mode with DMA
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ADC1_CR1 = ADC_CR1_SCAN; // enable scan mode
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// set sample time on channels 1&2: 239.5 cycles for better results
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ADC1_SMPR2 = 0x3f;
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dma_channel_reset(DMA1, DMA_CHANNEL1);
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DMA1_CPAR1 = (uint32_t) &(ADC_DR(ADC1));
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DMA1_CMAR1 = (uint32_t) &ADC_value;
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DMA1_CNDTR1 = 1;
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DMA1_CCR1 = DMA_CCR_MINC | DMA_CCR_PSIZE_16BIT | DMA_CCR_MSIZE_16BIT
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| DMA_CCR_CIRC | DMA_CCR_PL_HIGH | DMA_CCR_EN;
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// continuous conv, enable ADC & DMA
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ADC1_CR2 = ADC_CR2_CONT | ADC_CR2_ADON | ADC_CR2_DMA;
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// set channels
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uint8_t adc_channel_array = ADC_POWER_CHANNEL;
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adc_set_regular_sequence(ADC1, 1, &adc_channel_array);
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// reset calibration registers & start calibration
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ADC1_CR2 |= ADC_CR2_RSTCAL;
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while(ADC1_CR2 & ADC_CR2_RSTCAL); // wait for registers reset
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ADC1_CR2 |= ADC_CR2_CAL;
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while(ADC1_CR2 & ADC_CR2_CAL); // wait for calibration ends
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nvic_enable_irq(NVIC_ADC1_2_IRQ);
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ADC1_CR2 |= ADC_CR2_SWSTART;
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// turn on ADC - to do it we need set ADC_CR2_ADON again!
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ADC1_CR2 |= ADC_CR2_ADON;
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}
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