mirror of
https://github.com/RfidResearchGroup/ChameleonMini.git
synced 2026-05-12 11:20:37 -07:00
Federico Cerutti
c82572daf3
Since GCC 10, the compiler defaults to -fno-common, thus variables with multiple tentative definitions result in linker errors. We've (me and @MrMoDDoM) extern-ed the shared variables to fix the issue. Also, when I implemented ISR sharing, somehow I forgot about a function which was shared as well, so I fixed that mistake and added a couple of comments on how shared function calls work.
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/*
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* CODEC.c
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*
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* Created on: 18.02.2013
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* Author: skuser
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*/
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#include "Codec.h"
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#include "../System.h"
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#include "../LEDHook.h"
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uint16_t Reader_FWT = ISO14443A_RX_PENDING_TIMEOUT;
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#define READER_FIELD_MINIMUM_WAITING_TIME 70 // ms
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static uint16_t ReaderFieldStartTimestamp = 0;
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static uint16_t ReaderFieldRestartTimestamp = 0;
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static uint16_t ReaderFieldRestartDelay = 0;
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static volatile struct {
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bool Started;
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bool Ready;
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bool ToBeRestarted;
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} ReaderFieldFlags = { false };
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uint8_t CodecBuffer[CODEC_BUFFER_SIZE];
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uint8_t CodecBuffer2[CODEC_BUFFER_SIZE];
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void (* volatile isr_func_CODEC_TIMER_LOADMOD_CCB_VECT)(void) = NULL;
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void (* volatile isr_func_TCD0_CCC_vect)(void) = NULL;
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void (* volatile isr_func_CODEC_DEMOD_IN_INT0_VECT)(void) = NULL;
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// the following three functions prevent sending data directly after turning on the reader field
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void CodecReaderFieldStart(void) { // DO NOT CALL THIS FUNCTION INSIDE APPLICATION!
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if (!CodecGetReaderField() && !ReaderFieldFlags.ToBeRestarted) {
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CodecSetReaderField(true);
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ReaderFieldFlags.Started = true;
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ReaderFieldFlags.Ready = false;
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ReaderFieldStartTimestamp = SystemGetSysTick();
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}
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}
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void CodecReaderFieldStop(void) {
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CodecSetReaderField(false);
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ReaderFieldFlags.Started = false;
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ReaderFieldFlags.Ready = false;
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}
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void CodecReaderFieldRestart(uint16_t delay) {
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ReaderFieldFlags.ToBeRestarted = true;
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ReaderFieldRestartTimestamp = SystemGetSysTick();
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ReaderFieldRestartDelay = delay;
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CodecReaderFieldStop();
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}
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/*
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* This function returns false if and only if the reader field has been turned on in the last READER_FIELD_MIN..._TIME ms.
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* If the reader field is not active, true is returned.
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*/
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bool CodecIsReaderFieldReady(void) {
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if (!ReaderFieldFlags.Started)
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return true;
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if (ReaderFieldFlags.Ready || (ReaderFieldFlags.Started && SYSTICK_DIFF(ReaderFieldStartTimestamp) >= READER_FIELD_MINIMUM_WAITING_TIME)) {
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ReaderFieldFlags.Ready = true;
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return true;
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}
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return false;
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}
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bool CodecIsReaderToBeRestarted(void) {
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if (ReaderFieldFlags.ToBeRestarted) {
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if (SYSTICK_DIFF(ReaderFieldRestartTimestamp) >= ReaderFieldRestartDelay) {
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ReaderFieldFlags.ToBeRestarted = false;
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CodecReaderFieldStart();
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}
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return true;
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}
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return false;
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}
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void CodecThresholdSet(uint16_t th) { // threshold has to be saved back to eeprom by the caller, if wanted
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GlobalSettings.ActiveSettingPtr->ReaderThreshold = th;
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DACB.CH0DATA = th;
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}
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uint16_t CodecThresholdIncrement(void) { // threshold has to be saved back to eeprom by the caller, if wanted
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GlobalSettings.ActiveSettingPtr->ReaderThreshold += CODEC_THRESHOLD_CALIBRATE_STEPS;
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DACB.CH0DATA = GlobalSettings.ActiveSettingPtr->ReaderThreshold;
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return GlobalSettings.ActiveSettingPtr->ReaderThreshold;
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}
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void CodecThresholdReset(void) { // threshold has to be saved back to eeprom by the caller, if wanted
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GlobalSettings.ActiveSettingPtr->ReaderThreshold = DEFAULT_READER_THRESHOLD;
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DACB.CH0DATA = GlobalSettings.ActiveSettingPtr->ReaderThreshold;
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}
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