mirror of
https://github.com/eddyem/stm32samples.git
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95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
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* hardware_ini.c - functions for HW initialisation
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*
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* Copyright 2014 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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* All hardware-dependent initialisation & definition should be placed here
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* and in hardware_ini.h
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*
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*/
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#include "main.h"
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#include "hardware_ini.h"
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/**
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* GPIO initialisaion: clocking + pins setup
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*/
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void GPIO_init(){
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rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPAEN |
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RCC_APB2ENR_IOPBEN | RCC_APB2ENR_IOPCEN | RCC_APB2ENR_IOPDEN |
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RCC_APB2ENR_IOPEEN);
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// Buttons: pull-up input
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gpio_set_mode(BTNS_PORT, GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN,
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BTN_S2_PIN | BTN_S3_PIN);
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// turn on pull-up
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gpio_set(BTNS_PORT, BTN_S2_PIN | BTN_S3_PIN);
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// LEDS: opendrain output
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gpio_set_mode(LEDS_PORT, GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN,
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LED_D1_PIN | LED_D2_PIN);
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// turn off LEDs
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gpio_set(LEDS_PORT, LED_D1_PIN | LED_D2_PIN);
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/*
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// USB_DISC: push-pull
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gpio_set_mode(USB_DISC_PORT, GPIO_MODE_OUTPUT_2_MHZ,
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GPIO_CNF_OUTPUT_PUSHPULL, USB_DISC_PIN);
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// USB_POWER: open drain, externall pull down with R7 (22k)
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gpio_set_mode(USB_POWER_PORT, GPIO_MODE_INPUT,
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GPIO_CNF_INPUT_FLOAT, USB_POWER_PIN);
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*/
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}
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/*
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* SysTick used for system timer with period of 1ms
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*/
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void SysTick_init(){
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systick_set_clocksource(STK_CSR_CLKSOURCE_AHB_DIV8); // Systyck: 72/8=9MHz
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systick_set_reload(8999); // 9000 pulses: 1kHz
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systick_interrupt_enable();
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systick_counter_enable();
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}
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// check buttons S2/S3
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void check_btns(){
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static uint8_t oldstate[2] = {1,1}; // old buttons state
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uint8_t newstate[2], i;
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static uint32_t Old_timer[2] = {0,0};
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newstate[0] = gpio_get(BTNS_PORT, BTN_S2_PIN) ? 1 : 0;
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newstate[1] = gpio_get(BTNS_PORT, BTN_S3_PIN) ? 1 : 0;
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for(i = 0; i < 2; i++){
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uint8_t new = newstate[i];
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// pause for 60ms
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uint32_t O = Old_timer[i];
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if(!O){
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if(Timer - O > 60 || O > Timer){
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P("Button S");
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usb_send('2' + i);
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if(new) P("released");
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else P("pressed");
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newline();
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oldstate[i] = new;
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Old_timer[i] = 0;
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}
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}
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else if(new != oldstate[i]){
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Old_timer[i] = Timer;
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}
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}
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}
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