add Arduino source for TCS control. Porting is not finished yet, but it already opens the door periodically
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#include <Arduino.h>
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#include "TcsBus.h"
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#define TCS_OVERSAMPLING 8
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#define TCS_BAUDRATE 475
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//tcs_bus datagrams
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static const unsigned char acknowledge[] = {0,0,0,1,0,1,0,1,1,0};
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static const unsigned char ack_audio_on[] = {0,0,0,1,0,1,0,0,1,1,0,0};
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static const unsigned char doorbell[] = {0,0,0,1,1,0,1,0,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,0,1,1,0,1,0,1,0,1,0,0,1,1,0,0,1,0,1,0,1,0,1,0,0,1};
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static const unsigned char door_open[] = {0,0,0,1,0,1,0,1,1,0,1,0,1,1,0,0,1,0,1,0,1,0,1,0};
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static const unsigned char master_hmmmm[] = {0,0,0,1,0,1,0,0,1,0,1,0,0,1,0,0,1,0,1,0,1,0,1,0,1};
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static const unsigned char pickup[] = {0,0,0,1,1,0,1,0,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,0,1,1,0,1,0,1,0,1,0,0,1,1,0,0,1,0,1,0,1,0,1,0,0};
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//volatile uint8_t bitIndex = 25;
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//const uint8_t datagram[] = { 0,0,0,1,0,1,0,1,1,0,1,0,1,1,0,1,0,1,0,1,0,1,0,0, 1 };
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static const unsigned char hang_up[] = {0,0,0,1,0,1,0,0,1,1,0,1,0,1,0,0,1,0,1,0,1,0,1,0};
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static const unsigned char post_hang_up[] = {0,0,0,1,0,1,0,0,1,0,1,0,1,1,0,1,0,1,0,1,0,1,0,0};
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static const unsigned char light[] = {0,0,0,1,0,1,0,1,1,0,1,0,0,1,0,1,0,1,0,1,0,1,0,0};
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TcsBus::TcsBus(int sendPin, int receivePin) :
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sendPin { sendPin },
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receivePin { receivePin },
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state { SamplingState::IDLE },
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rxBits { 0 },
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oversamplingStep { 0 }
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{
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}
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static hw_timer_t* timer = NULL;
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static TcsBus* tcsInstance = NULL;
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static void onTimer(void)
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{
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tcsInstance->TimeBase();
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}
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static bool TimerSetup(TcsBus* inst)
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{
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if(timer != NULL) return false; //already set up
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tcsInstance = inst;
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//time base is 80 MHz, which will be divided by the value from timerBegin, and then
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//a counter increments until it reaches the value from timerAlarmWrite. onTimer will then be fired as a callback.
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//80000000 / 50 / 421 = 3800.47 Hz = 8 * 475.06
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timer = timerBegin(0, 50, true);
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timerAttachInterrupt(timer, &onTimer, true);
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timerAlarmWrite(timer, 421, true);
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timerAlarmEnable(timer);
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return true;
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}
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void TcsBus::begin()
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{
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//Pin setup
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pinMode(receivePin, INPUT);
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pinMode(sendPin, OUTPUT);
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digitalWrite(sendPin, LOW); //disable sending for now
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pinMode(0, OUTPUT);
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TimerSetup(this);
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}
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void TcsBus::TimeBase()
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{
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static int tmp = 0;
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static bool send = false;
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static int sendIdx = 0;
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static int over = 0;
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tmp++;
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if(tmp == 3000) {
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send = true;
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sendIdx = 0;
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over = 0;
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}
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if(send) {
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over++;
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if(over == 8) {
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over = 0;
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if(sendIdx >= sizeof(door_open)) {
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digitalWrite(sendPin, LOW);
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send = false;
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tmp = 0;
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} else {
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digitalWrite(sendPin, (door_open[sendIdx++]) ? LOW : HIGH);
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}
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}
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}
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bool sample = digitalRead(receivePin);
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digitalWrite(0, sample == 0 ? LOW : HIGH);
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return;
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switch(state) {
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case SamplingState::IDLE: {
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if(sample) {
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state = SamplingState::RECEIVE;
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} else {
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break;
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}
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} //fall through
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case SamplingState::RECEIVE: {
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} break;
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case SamplingState::TRANSMIT: {
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static int i = 0;
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i++;
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if(i == 1000)
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{
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digitalWrite(sendPin, HIGH);
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} else if(i > 1000) {
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digitalWrite(sendPin, LOW);
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i = 0;
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}
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} break;
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}
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}
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#ifndef TCS_BUS_H_
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#define TCS_BUS_H_ 1
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#include <cstdint>
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class TcsBus {
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public:
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TcsBus(int sendPin, int receivePin);
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void begin();
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void TimeBase();
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private:
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int sendPin;
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int receivePin;
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enum class SamplingState
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{
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IDLE = 0,
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RECEIVE = 1,
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TRANSMIT = 2,
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};
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SamplingState state;
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uint16_t rxBits;
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uint8_t oversamplingStep;
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bool lastSample;
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};
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#endif //TCS_BUS_H_
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@ -0,0 +1,44 @@
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#include <Wire.h>
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#include "TcsBus.h"
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#define PCA9554_ADDR 0x20 //PCA9554 = 0 1 0 0 a2 a1 a0
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#define PIN_AUDIO_READ 0
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#define PIN_API_SWITCH 4
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#define PIN_TCS_READ 13
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#define PIN_TCS_SEND 14
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#define PIN_AUDIO_SEND 17
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TcsBus tcs(PIN_TCS_SEND, PIN_TCS_READ);
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static uint32_t ms_old = 0;
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void setup() {
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// put your setup code here, to run once:
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Wire.begin();
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Serial.begin(115200);
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tcs.begin();
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ms_old = millis();
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}
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void i2cScan() {
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for(uint8_t a = 0; a < 0x80; a++) {
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Wire.beginTransmission(a);
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byte error = Wire.endTransmission();
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if(!error) Serial.printf("i2cScan: found 0x%0x\n", a);
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}
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}
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void loop() {
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uint32_t ms = millis();
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if(ms_old != ms) {
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if(ms_old < ms) ms_old++; else ms_old = ms; //prevent overflow
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if(!(ms & 1023)) {
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i2cScan();
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}
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}
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}
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