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https://github.com/eddyem/stm32samples.git
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103 lines
2.9 KiB
C
103 lines
2.9 KiB
C
/*
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* This file is part of the canbus4bta project.
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* Copyright 2024 Edward V. Emelianov <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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "flash.h"
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#include "gpio.h"
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#include "hardware.h"
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// GPIO IN management by two 74HC4051
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static uint8_t eswitches[2] = {0};
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static uint8_t stage = 0;
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static uint32_t lastT[8][2] = {0}; // last time of ESW changed
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uint8_t getESW(uint8_t nch){
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return eswitches[nch];
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}
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// update `eswitches`, anti-bounce
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TRUE_INLINE void updesw(uint8_t nch, uint8_t newval){
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uint8_t mask = eswitches[nch] ^ newval, newmask = 0;
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if(mask == 0) return;
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for(uint8_t bit = 0; bit < 8; ++bit){ // check all bits of mask
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newmask >>= 1;
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if((mask & 1) && Tms - lastT[bit][nch] >= the_conf.bounce_ms){ // OK, change this value
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newmask |= 0x80;
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lastT[bit][nch] = Tms;
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}
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mask >>= 1;
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}
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if(newmask == 0) return;
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// now change only allowable bits
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eswitches[nch] = (eswitches[nch] & ~newmask) | (newval & newmask);
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}
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/**
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* @brief ESW_process - process multiplexer 1
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*/
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void ESW_process(){
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static uint8_t curch = 0;
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static int curaddr = 7;
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static uint8_t ESW = 0;
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switch(stage){
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case 0: // stage 0: change address and turn on multiplexer
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stage = 1;
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MULADDR_set(curaddr);
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MUL_ON(curch);
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break;
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case 1: // stage 1: read data and turn off mul
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default:
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stage = 0;
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ESW <<= 1;
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ESW |= ESW_GET();
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MUL_OFF(curch);
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if(--curaddr < 0){
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updesw(curch, ESW);
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curch = !curch;
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curaddr = 7;
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}
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break;
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}
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}
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static void NeverDoThisFuckingShit(){
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uint32_t ctr = 3;
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while(ctr--) nop();
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}
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/**
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* @brief getSwitches - blocking read of all switches of given channel
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* @param chno - number of multiplexer: 0 (board switches) or 1 (external ESW)
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*/
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uint8_t getSwitches(uint8_t chno){
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if(chno > 1) return 0;
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MUL_OFF(0); MUL_OFF(1);
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uint8_t state = 0;
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for(int i = 7; i > -1; --i){
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MULADDR_set(i);
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MUL_ON(chno);
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state <<= 1;
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NeverDoThisFuckingShit();
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state |= ESW_GET();
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MUL_OFF(chno);
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NeverDoThisFuckingShit();
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}
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stage = 0; // prevent interference with `ESW_process()`
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return state;
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}
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