Add initial glass lathe test code

3 files changed, 124 insertions, 0 deletions

diff --git a/linz/glasslathe/.gitignore b/linz/glasslathe/.gitignore
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+++ b/linz/glasslathe/.gitignore
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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch
diff --git a/linz/glasslathe/platformio.ini b/linz/glasslathe/platformio.ini
new file mode 100644
index 0000000..f2cb76e
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+++ b/linz/glasslathe/platformio.ini
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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nanoatmega328new]
+platform = atmelavr
+board = nanoatmega328new
+framework = arduino
+lib_deps = paulstoffregen/TimerOne @ ^1.1
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diff --git a/linz/glasslathe/src/main.cpp b/linz/glasslathe/src/main.cpp
new file mode 100644
index 0000000..85b49dd
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+++ b/linz/glasslathe/src/main.cpp
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+#include <Arduino.h>
+#include <TimerOne.h>
+
+void analogWriteSAH_Init(void)
+{
+  // Stop the timer while we muck with it
+  TCCR1B = (0 << ICNC1) | (0 << ICES1) | (0 << WGM13) | (0 << WGM12) | (0 << CS12) | (0 << CS11) | (0 << CS10);
+
+  // Set the timer to mode 14...
+  //
+  // Mode  WGM13  WGM12  WGM11  WGM10  Timer/Counter Mode of Operation  TOP   Update of OCR1x at TOV1  Flag Set on
+  //              CTC1   PWM11  PWM10
+  // ----  -----  -----  -----  -----  -------------------------------  ----  -----------------------  -----------
+  // 14    1      1      1      0      Fast PWM                         ICR1  BOTTOM                   TOP
+
+  // Set output on Channel A to...
+  //
+  // COM1A1  COM1A0  Description
+  // ------  ------  -----------------------------------------------------------
+  // 1       0       Clear OC1A/OC1B on Compare Match (Set output to low level).
+  TCCR1A =
+      (1 << COM1A1) | (0 << COM1A0) |   // COM1A1, COM1A0 = 1, 0
+      (0 << COM1B1) | (0 << COM1B0) |
+      (1 << WGM11)  | (0 << WGM10);     // WGM11, WGM10 = 1, 0
+
+  // Set TOP to...
+  //
+  // fclk_I/O = 16000000
+  // N        = 1
+  // TOP      = 799
+  //
+  // fOCnxPWM = fclk_I/O / (N * (1 + TOP))
+  // fOCnxPWM = 16000000 / (1 * (1 + 799))
+  // fOCnxPWM = 16000000 / 800
+  // fOCnxPWM = 20000
+  ICR1 = 799;
+
+  // Ensure the first slope is complete
+  TCNT1 = 0;
+
+  // Ensure Channel B is irrelevant
+  OCR1B = 0;
+
+  // Ensure Channel A starts at zero / off
+  OCR1A = 0;
+
+  // We don't need no stinkin interrupts
+  TIMSK1 = (0 << ICIE1) | (0 << OCIE1B) | (0 << OCIE1A) | (0 << TOIE1);
+
+  // Ensure the Channel A pin is configured for output
+  DDRB |= (1 << DDB1);
+
+  // Start the timer...
+  //
+  // CS12  CS11  CS10  Description
+  // ----  ----  ----  ------------------------
+  // 0     0     1     clkI/O/1 (No prescaling)
+  TCCR1B =
+      (0 << ICNC1) | (0 << ICES1) |
+      (1 << WGM13) | (1 << WGM12) |              // WGM13, WGM12 = 1, 1
+      (0 << CS12) | (0 << CS11) | (1 << CS10);
+}
+
+void analogWriteD9(uint16_t value)
+{
+  if ((value >= 0) && (value < 800))
+  {
+    OCR1A = value;
+  }
+}
+
+void setup()
+{
+  //analogWriteSAH_Init();
+  Timer1.initialize(50);
+  Timer1.pwm(9, 1024/2);
+  Serial.begin(9600);
+}
+
+void loop()
+{
+  static int old_poti = 0;
+  int poti = analogRead(A7) / 10;
+  if (poti != old_poti) {
+    // period_us = 1 / khz * 1000
+    int period_us = (poti == 0) ? 0 : map(poti, 1, 102, 600, 50);
+    Timer1.initialize(period_us);
+    Timer1.pwm(9, 1024/2);
+    Serial.println(poti);
+    Serial.println(period_us);
+    old_poti = poti;
+  }
+  //Timer1.setPeriod();
+  //Timer1.setPeriod(50);
+  //Timer1.restart();
+
+#if 0
+  for (float frequency = 500; frequency < 3000; frequency = frequency + 1) {
+    float T = 1 / frequency * 1000000;
+    //Timer1.setPeriod(T);
+    delay(5);
+  }
+#endif
+}
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