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--- projects:arduino_with_dragon_attiny13 [2020/09/21 13:10] – [Getting started] admin
+++ projects:arduino_with_dragon_attiny13 [2020/10/11 19:20] (current) – admin
@@ Line 88: / Line 88: @@
 void loop() {
   for (int i=0; i <= 255; i++) {
-    digitalWrite(P2_PB3, (i & 1) != 0);
+    digitalWrite(P2_PB3, (i & 1) ? HIGH : LOW);
-    digitalWrite(P5_PB0, (i & 2) != 0);
+    digitalWrite(P5_PB0, (i & 2) ? HIGH : LOW);
-    digitalWrite(P6_PB1, (i & 4) != 0);
+    digitalWrite(P6_PB1, (i & 4) ? HIGH : LOW);
-    digitalWrite(P7_PB2, (i & 8) != 0);
+    digitalWrite(P7_PB2, (i & 8) ? HIGH : LOW);
     delay(500);
   }
@@ Line 97: / Line 97: @@
 </code>
-Now you can easy verify if all pins are correctly controlled: Pin 2 should show every 0.5 second a change, Pin 5 should show every second, pint 6 every 2 seconds and pin 7 every 4 seconds.
+Now you can easy verify if all pins are correctly controlled: Pin 2 should show every 0.5 second a change, Pin 5 should show every second, pin 6 every 2 seconds and pin 7 every 4 seconds.
+===== Burst Controller =====
+<code c>
+/**
+ * ESD burst control
+ * Controllersoftware for switching output pins in a sequence
+ * based on a trigger from one input pin.
+ *
+ * The output pins control 3 high voltage relays and one
+ * trigger output for measurement purposes.
+ *
+ * Input pin uses gpio and timer based interrupt to handle
+ * debouncing and signal edge processing. This simplifies
+ * processing a great deal.
+ *
+ * Hardware is based on the ATTINY13 8-bit microcontroller.
+ * Development was done with Arduino IDE, extended with the
+ * MicroCore, installed via:
+ * Arduino Preferences -> Additional Boards Manager URLs
+ *   https://mcudude.github.io/MicroCore/package_MCUdude_MicroCore_index.json
+ * And then selected via Tools -> Board -> MicroCore -> ATtiny13
+ * The device is programmed using ISP programming with the AVR Dragon.
+ * From within Arduino the ATtiny13 can then be programmed with the Upload
+ * button. The selected programmer is the DragonISP.
+ *
+ * You need to edit the programmers.txt file in Arduino:
+ *   $HOME/.arduino15/packages/MicroCore/hardware/avr/1.0.6/programmers.txt
+ *
+ * See here for details:
+ *   https://www.auditeon.com/projects:arduino_with_dragon_attiny13
+ *
+ * For pinout, see following page:
+ * https://github.com/MCUdude/MicroCore
+ *
+ * License: MIT
+ * Author: Marc Nijdam 10-10-2020
+ */
+#define ARRAY_SIZE(x)  (sizeof(x) / sizeof(x[0]))
+#define P1_PB5_NC 5
+#define P2_PB3_TRIGOUT 3
+#define P3_PB4_TOGGLESW 4
+#define P5_PB0_CHARGE 0
+#define P6_PB1_DSCHRG 1
+#define P7_PB2_ALLOFF 2
+#define STOP 255
+/**
+ * pin name and active state
+ */
+const struct {
+  const uint8_t pin; // pin name
+  const uint8_t das; // default active state
+} io[] = {
+  [0] = {P7_PB2_ALLOFF ,1}, // bit 0, active high
+  [1] = {P2_PB3_TRIGOUT,1}, // bit 1, active high
+  [2] = {P6_PB1_DSCHRG ,0}, // bit 2, active low
+  [3] = {P5_PB0_CHARGE ,0}, // bit 3, active low
+  [4] = {P1_PB5_NC ,1}      // reset pin
+};
+/**
+ *  ____> charge -------------> (i.e. on high, switch closes)
+ * | ___> discharge ----------> (i.e. on high, switch closes)
+ * || __> trigout + pulldown -> (i.e. on high, trigger goes up.)
+ * ||| _> all off ------------> (i.e. on high, it connects output to gnd)
+ * ||||
+ * 0000
+ *
+ * 0: not active
+ * 1: active
+ */
+const struct {
+  const uint8_t bits; // bitpattern for gpio output pins
+  const uint16_t dur; // duration in ms
+} patterns[] = {
+  {0b0000,  100}, /*  charge   */
+  {0b0000,  100}, /*     !     */
+  {0b1000,    0}, /*    \ /    */
+  {STOP, 0},      /*   _____   */
+  {0b0101,    0}, /*           */
+  {0b0110, 5000}, /*    / \    */
+  {0b0010,    0}, /*     !     */
+  {0b0000,  500}, /*     !     */
+  {0b0000,  100}, /* discharge */
+};
+/* counter which points to index of array */
+volatile uint8_t processing;
+volatile uint8_t pat_idx;
+volatile uint8_t mode; // 0: charge, 1: discharge
+void setup() {
+  /* initialize digital in- and output pins */
+  pinMode(P3_PB4_TOGGLESW, INPUT_PULLUP);
+  for (uint8_t i=0; i < ARRAY_SIZE(io); i++) {
+    pinMode(io[i].pin, OUTPUT);
+  }
+  mode = digitalRead(P3_PB4_TOGGLESW); // switch: 0=charging, 1=discharging
+  /* initialize flag, 0: processing not initiated, 1: processing */
+  processing = 0;
+  /* enable interrupt from PB4 */
+  setup_gpio_interrupt(P3_PB4_TOGGLESW);
+  enable_pcint_interrupt();
+  /* enable interrupt from timer for semi-automatic with 1x 0.12ms debounce */
+  setup_timer_interrupt(1);
+  /* enable all interrupts */
+  sei();
+}
+// the loop function runs over and over again forever
+void loop() {
+  if (!processing) {
+    processing = 1;
+    process_sequence(mode);
+  }
+}
+void process_sequence(uint8_t md) {
+  pat_idx = md ? ARRAY_SIZE(patterns) - 1 : 0;
+  for (;;) {
+    set_bits(patterns[pat_idx].bits);
+    /* wait ms duration, unless interrupted by switch */
+    if (wait_ms(patterns[pat_idx].dur)) return;
+    pat_idx += 1 - 2*md;
+    if (patterns[pat_idx].bits == STOP) return;
+  }
+}
+/**
+ * Set bit pattern onto gpio output
+ * take into account active state
+ */
+void set_bits(uint8_t bits) {
+  for (uint8_t i=0; i < ARRAY_SIZE(io); i++) {
+    digitalWrite(io[i].pin, !io[i].das ^ (( (1 << i) & bits) ? HIGH : LOW));
+  }
+}
+uint8_t wait_ms(uint16_t d) {
+  unsigned long ts = millis() + d;
+  for (;;) {
+    if (millis() >= ts) return 0;
+    if (!processing) return 1;
+    delay(1);
+  }
+}
+void setup_gpio_interrupt(uint8_t port) {
+  pinMode(port, INPUT_PULLUP);
+  MCUCR |=  (1<<ISC00); // Trigger INT0 on rising edge
+  MCUCR &= ~(1<<ISC01); // Trigger INT1 on rising edge
+  PCMSK |= (1<<PCINT4); // pin change mask: listen to portb, pin PB4
+}
+/**
+ * enable PCINT interrupt
+ */
+void enable_pcint_interrupt(void) {
+  GIMSK |= (1<<PCIE);
+}
+/**
+ * disable PCINT interrupt
+ */
+void disable_pcint_interrupt(void) {
+  GIMSK &= ~(1<<PCIE);
+}
+/**
+ * @brief setup timer interrupt
+ * @param duration in unit of +/- 0.125ms
+ */
+void setup_timer_interrupt(uint8_t d) {
+  TCCR0A |= _BV(WGM01); // set timer counter mode to CTC
+  TCCR0B |= _BV(CS02)|_BV(CS00); // set prescaler to 1024 (CLK=1200000Hz/1024/256=4.57Hz, 0.22s)
+  OCR0A = d; // set Timer's counter max value
+}
+void enable_timer_interrupt(void) {
+  TIMSK0 |= _BV(OCIE0A); // enable Timer CTC interrupt
+}
+void disable_timer_interrupt(void) {
+  TIMSK0 &= ~_BV(OCIE0A); // disable Timer CTC interrupt
+}
+ISR(PCINT0_vect) // Interrupt on Int0 vector
+{
+  disable_pcint_interrupt();
+  /* prevent false interrupt from switch, only allow toggle */
+  if (mode != digitalRead(P3_PB4_TOGGLESW)) {
+    mode = digitalRead(P3_PB4_TOGGLESW);
+    processing = 0;
+  }
+  /* use timer interrupt for debouncing */
+  enable_timer_interrupt();
+}
+ISR(TIM0_COMPA_vect) // Interrupt on Timer0 vector
+{
+  disable_timer_interrupt();
+  enable_pcint_interrupt();
+}
+</code>

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