mirror of
https://github.com/eddyem/stm32samples.git
synced 2025-12-06 18:55:13 +03:00
63 lines
2.5 KiB
C
63 lines
2.5 KiB
C
/*
|
|
* adc.c - functions for Sharp 2Y0A02 distance meter & photosensor
|
|
*
|
|
* Copyright 2015 Edward V. Emelianov <eddy@sao.ru, edward.emelianoff@gmail.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
|
|
* MA 02110-1301, USA.
|
|
*/
|
|
|
|
#include "adc.h"
|
|
#include "main.h"
|
|
#include "usbkeybrd.h"
|
|
|
|
uint16_t ADC_value; // Value of ADC
|
|
uint16_t ADC_trig_val; // -//- at trigger time
|
|
|
|
void init_adc_sensor(){
|
|
// we will use ADC1 channel 0 for IR sensor & ADC1 channel 1 for laser's photoresistor
|
|
// Make sure the ADC doesn't run during config
|
|
adc_off(ADC1);
|
|
// enable ADC & PA0/PA1 clocking
|
|
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_ADC1EN | RCC_APB2ENR_IOPAEN);
|
|
rcc_set_adcpre(RCC_CFGR_ADCPRE_PCLK2_DIV4);
|
|
gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_ANALOG, GPIO6);
|
|
rcc_periph_clock_enable(RCC_DMA1); // enable DMA for ADC values storing
|
|
// Configure ADC as continuous scan mode with DMA
|
|
ADC1_CR1 = ADC_CR1_SCAN; // enable scan mode
|
|
// set sample time on channels 1&2: 239.5 cycles for better results
|
|
ADC1_SMPR2 = 0x3f;
|
|
dma_channel_reset(DMA1, DMA_CHANNEL1);
|
|
DMA1_CPAR1 = (uint32_t) &(ADC_DR(ADC1));
|
|
DMA1_CMAR1 = (uint32_t) &ADC_value;
|
|
DMA1_CNDTR1 = 1;
|
|
DMA1_CCR1 = DMA_CCR_MINC | DMA_CCR_PSIZE_16BIT | DMA_CCR_MSIZE_16BIT
|
|
| DMA_CCR_CIRC | DMA_CCR_PL_HIGH | DMA_CCR_EN;
|
|
// continuous conv, enable ADC & DMA
|
|
ADC1_CR2 = ADC_CR2_CONT | ADC_CR2_ADON | ADC_CR2_DMA;
|
|
// set channels
|
|
uint8_t adc_channel_array = ADC_POWER_CHANNEL;
|
|
adc_set_regular_sequence(ADC1, 1, &adc_channel_array);
|
|
// reset calibration registers & start calibration
|
|
ADC1_CR2 |= ADC_CR2_RSTCAL;
|
|
while(ADC1_CR2 & ADC_CR2_RSTCAL); // wait for registers reset
|
|
ADC1_CR2 |= ADC_CR2_CAL;
|
|
while(ADC1_CR2 & ADC_CR2_CAL); // wait for calibration ends
|
|
nvic_enable_irq(NVIC_ADC1_2_IRQ);
|
|
ADC1_CR2 |= ADC_CR2_SWSTART;
|
|
// turn on ADC - to do it we need set ADC_CR2_ADON again!
|
|
ADC1_CR2 |= ADC_CR2_ADON;
|
|
}
|