mirror of
https://github.com/eddyem/stm32samples.git
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119 lines
4.5 KiB
C
119 lines
4.5 KiB
C
/*
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* geany_encoding=koi8-r
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* hardware.c - hardware-dependent macros & functions
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*
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* Copyright 2018 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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*/
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#include "adc.h"
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#include "hardware.h"
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#include "time.h"
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#include "usart.h"
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static inline void gpio_setup(){
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// Enable clocks to the GPIO subsystems (PB for ADC), turn on AFIO clocking to disable SWD/JTAG
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RCC->APB2ENR |= RCC_APB2ENR_IOPAEN | RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_AFIOEN;
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// turn off SWJ/JTAG
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AFIO->MAPR = AFIO_MAPR_SWJ_CFG_DISABLE;
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// pullups: PA1 - PPS, PA13/PA14 - buttons
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GPIOA->ODR = (1<<12)|(1<<13)|(1<<14)|(1<<15);
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// Set leds (PB8) as opendrain output
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GPIOB->CRH = CRH(8, CNF_ODOUTPUT|MODE_SLOW) | CRH(9, CNF_ODOUTPUT|MODE_SLOW);
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// PPS pin (PA1) - input with weak pullup
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GPIOA->CRL = CRL(1, CNF_PUDINPUT|MODE_INPUT);
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// Set buttons (PA13/14) as inputs with weak pullups, USB pullup (PA15) - opendrain output
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GPIOA->CRH = CRH(13, CNF_PUDINPUT|MODE_INPUT) | CRH(14, CNF_PUDINPUT|MODE_INPUT) |
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CRH(15, CNF_ODOUTPUT|MODE_SLOW);
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// EXTI: all three EXTI are on PA -> AFIO_EXTICRx = 0
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// interrupt on pulse front: buttons - 1->0, PPS - 0->1
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EXTI->IMR = EXTI_IMR_MR1 | EXTI_IMR_MR13 | EXTI_IMR_MR14; // unmask
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EXTI->RTSR = EXTI_RTSR_TR1; // rising trigger
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EXTI->FTSR = EXTI_FTSR_TR13 | EXTI_FTSR_TR14; // falling trigger
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NVIC_EnableIRQ(EXTI15_10_IRQn);
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NVIC_EnableIRQ(EXTI1_IRQn);
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}
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static inline void adc_setup(){
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GPIOB->CRL |= CRL(0, CNF_ANALOG|MODE_INPUT);
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uint32_t ctr = 0;
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// Enable clocking
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RCC->APB2ENR |= RCC_APB2ENR_ADC1EN;
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RCC->CFGR &= ~(RCC_CFGR_ADCPRE);
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RCC->CFGR |= RCC_CFGR_ADCPRE_DIV8; // ADC clock = RCC / 8
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// sampling time - 239.5 cycles for channels 8, 16 and 17
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ADC1->SMPR2 = ADC_SMPR2_SMP8;
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ADC1->SMPR1 = ADC_SMPR1_SMP16 | ADC_SMPR1_SMP17;
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// we have three conversions in group -> ADC1->SQR1[L] = 2, order: 8->16->17
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ADC1->SQR3 = 8 | (16<<5) | (17<<10);
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ADC1->SQR1 = ADC_SQR1_L_1;
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ADC1->CR1 |= ADC_CR1_SCAN; // scan mode
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// DMA configuration
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RCC->AHBENR |= RCC_AHBENR_DMA1EN;
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DMA1_Channel1->CPAR = (uint32_t) (&(ADC1->DR));
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DMA1_Channel1->CMAR = (uint32_t)(ADC_array);
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DMA1_Channel1->CNDTR = NUMBER_OF_ADC_CHANNELS * 9;
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DMA1_Channel1->CCR |= DMA_CCR_MINC | DMA_CCR_MSIZE_0 | DMA_CCR_PSIZE_0
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| DMA_CCR_CIRC | DMA_CCR_PL | DMA_CCR_EN;
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// continuous mode & DMA; enable vref & Tsens; wake up ADC
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ADC1->CR2 |= ADC_CR2_DMA | ADC_CR2_TSVREFE | ADC_CR2_CONT | ADC_CR2_ADON;
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// wait for Tstab - at least 1us
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while(++ctr < 0xff) nop();
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// calibration
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ADC1->CR2 |= ADC_CR2_RSTCAL;
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ctr = 0; while((ADC1->CR2 & ADC_CR2_RSTCAL) && ++ctr < 0xfffff);
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ADC1->CR2 |= ADC_CR2_CAL;
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ctr = 0; while((ADC1->CR2 & ADC_CR2_CAL) && ++ctr < 0xfffff);
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// turn ON ADC
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ADC1->CR2 |= ADC_CR2_ADON;
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}
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void hw_setup(){
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gpio_setup();
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//adc_setup();
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}
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void exti1_isr(){ // PPS - PA1
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systick_correction();
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DBG("exti1");
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EXTI->PR = EXTI_PR_PR1;
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}
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void exti15_10_isr(){ // PA13 - button0, PA14 - button1
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if(EXTI->PR & EXTI_PR_PR13){
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/*
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if(trigger_ms[0] == DIDNT_TRIGGERED){ // prevent bounce
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trigger_ms[0] = Timer;
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memcpy(&trigger_time[0], ¤t_time, sizeof(curtime));
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}
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*/
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DBG("exti13");
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EXTI->PR = EXTI_PR_PR13;
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}
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if(EXTI->PR & EXTI_PR_PR14){
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/*
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if(trigger_ms[3] == DIDNT_TRIGGERED){ // prevent bounce
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trigger_ms[3] = Timer;
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memcpy(&trigger_time[3], ¤t_time, sizeof(curtime));
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}
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*/
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DBG("exti14");
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EXTI->PR = EXTI_PR_PR14;
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}
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}
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