initial support for Noctigon KR4

  (not complete, but far enough that it installs and runs)
New hardware support features:
  - allow using PCINT other than 0 (PCINT1, PCINT2, etc)
  - option to ignore voltage ADC while the button is pressed
    (because my prototype shorts the voltage divider to 0 while the button is down)

1 files changed, 147 insertions, 0 deletions

diff --git a/hwdef-Noctigon_KR4.h b/hwdef-Noctigon_KR4.h
new file mode 100644
index 0000000..c1bc171
--- /dev/null
+++ b/hwdef-Noctigon_KR4.h
@@ -0,0 +1,147 @@
+#ifndef HWDEF_NOCTIGON_KR4_H
+#define HWDEF_NOCTIGON_KR4_H
+
+/* Noctigon KR4 driver layout (attiny1634)
+ *
+ * Pin / Name / Function
+ *   1    PA6   FET PWM (direct drive) (PWM1B)
+ *   2    PA5   R: red aux LED (PWM0B)
+ *   3    PA4   G: green aux LED
+ *   4    PA3   B: blue aux LED
+ *   5    PA2   (none)
+ *   6    PA1   (none)
+ *   7    PA0   (none)
+ *   8    GND   GND
+ *   9    VCC   VCC
+ *  10    PC5   (none)
+ *  11    PC4   (none)
+ *  12    PC3   RESET
+ *  13    PC2   (none)
+ *  14    PC1   SCK
+ *  15    PC0   (none) PWM0A
+ *  16    PB3   main LED PWM (linear) (PWM1A)
+ *  17    PB2   MISO / e-switch (PCINT10)
+ *  18    PB1   MOSI / battery voltage (ADC6)
+ *  19    PB0   Opamp power
+ *  20    PA7   (none)
+ *      ADC12   thermal sensor
+ *
+ * Main LED power uses one pin to turn the Opamp on/off,
+ * and one pin to control Opamp power level.
+ * Main brightness control uses the power level pin, with 4 kHz 10-bit PWM.
+ * The on/off pin is only used to turn the main LED on and off,
+ * not to change brightness.
+ * Some models also have a direct-drive FET for turbo.
+ */
+
+#ifdef ATTINY
+#undef ATTINY
+#endif
+#define ATTINY 1634
+#include <avr/io.h>
+
+#define PWM_CHANNELS 1
+#define PWM_BITS 10  // 0 to 1023 at 4 kHz, not 0 to 255 at 16 kHz
+#define PWM_TOP 1023
+
+#define SWITCH_PIN   PB2     // pin 17
+#define SWITCH_PCINT PCINT10 // pin 17 pin change interrupt
+#define SWITCH_PCIE  PCIE1   // PCIE1 is for PCINT[11:8]
+#define SWITCH_PCMSK PCMSK1  // PCMSK1 is for PCINT[11:8]
+#define SWITCH_PORT  PINB    // PINA or PINB or PINC
+#define PCINT_vect   PCINT1_vect  // ISR for PCINT[11:8]
+
+// the button tends to short out the voltage divider,
+// so ignore voltage while the button is being held
+#define NO_LVP_WHILE_BUTTON_PRESSED
+
+
+#define PWM1_PIN PB3        // pin 16, Opamp reference
+#define PWM1_LVL OCR1A      // OCR1A is the output compare register for PB3
+
+#define PWM2_PIN PA6        // pin 1, DD FET PWM
+#define PWM2_LVL OCR1B      // OCR1B is the output compare register for PA6
+
+#define LED_ENABLE_PIN  PB0    // pin 19, Opamp power
+#define LED_ENABLE_PORT PORTB  // control port for PB0
+
+
+#define USE_VOLTAGE_DIVIDER  // use a dedicated pin, not VCC, because VCC input is flattened
+#define VOLTAGE_PIN PB1      // Pin 18 / PB1 / ADC6
+// pin to ADC mappings are in DS table 19-4
+#define VOLTAGE_ADC      ADC6D  // digital input disable pin for PB1
+// DIDR0/DIDR1 mappings are in DS section 19.13.5, 19.13.6
+#define VOLTAGE_ADC_DIDR DIDR1  // DIDR channel for ADC6D
+// DS tables 19-3, 19-4
+// Bit   7     6     5      4     3    2    1    0
+//     REFS1 REFS0 REFEN ADC0EN MUX3 MUX2 MUX1 MUX0
+// MUX[3:0] = 0, 1, 1, 0 for ADC6 / PB1
+// divided by ...
+// REFS[1:0] = 1, 0 for internal 1.1V reference
+// other bits reserved
+#define ADMUX_VOLTAGE_DIVIDER 0b10000111
+#define ADC_PRSCL   0x06    // clk/64
+
+// TODO: calibrate this
+// Raw ADC readings at 4.4V and 2.2V
+// calibrate the voltage readout here
+// estimated / calculated values are:
+//   (voltage - D1) * (R2/(R2+R1) * 256 / 1.1)
+// D1, R1, R2 = 0, 330, 100
+#ifndef ADC_44
+//#define ADC_44 981  // raw value at 4.40V
+#define ADC_44 967  // manually tweaked so 4.16V will blink out 4.2
+#endif
+#ifndef ADC_22
+//#define ADC_22 489  // raw value at 2.20V
+#define ADC_22 482  // manually tweaked so 4.16V will blink out 4.2
+#endif
+
+#define TEMP_CHANNEL 0b00001111
+
+// this light has aux LEDs under the optic
+#define AUXLED_R_PIN    PA5    // pin 2
+#define AUXLED_G_PIN    PA4    // pin 3
+#define AUXLED_B_PIN    PA3    // pin 4
+#define AUXLED_RGB_PORT PORTA  // PORTA or PORTB or PORTC
+#define AUXLED_RGB_DDR  DDRA   // DDRA or DDRB or DDRC
+#define AUXLED_RGB_PUE  PUEA   // PUEA or PUEB or PUEC
+
+// with so many pins, doing this all with #ifdefs gets awkward...
+// ... so just hardcode it in each hwdef file instead
+inline void hwdef_setup() {
+  // enable output ports
+  // Opamp level and Opamp on/off
+  DDRB = (1 << PWM1_PIN)
+       | (1 << LED_ENABLE_PIN);
+  // DD FET PWM, aux R/G/B
+  DDRA = (1 << PWM2_PIN)
+       | (1 << AUXLED_R_PIN)
+       | (1 << AUXLED_G_PIN)
+       | (1 << AUXLED_B_PIN)
+       ;
+
+  // configure PWM
+  // Setup PWM. F_pwm = F_clkio / 2 / N / TOP, where N = prescale factor, TOP = top of counter
+  // pre-scale for timer: N = 1
+  // WGM1[3:0]: 0,0,1,1: PWM, Phase Correct, 10-bit (DS table 12-5)
+  // CS1[2:0]:    0,0,1: clk/1 (No prescaling) (DS table 12-6)
+  // COM1A[1:0]:    1,0: PWM OC1A in the normal direction (DS table 12-4)
+  // COM1B[1:0]:    0,0: PWM OC1B disabled (DS table 12-4)
+  TCCR1A  = (1<<WGM11)  | (1<<WGM10)   // 10-bit (TOP=0x03FF) (DS table 12-5)
+          | (1<<COM1A1) | (0<<COM1A0)  // PWM 1A in normal direction (DS table 12-4)
+          | (0<<COM1B1) | (0<<COM1B0)  // PWM 1B in normal direction (DS table 12-4)
+          ;
+  TCCR1B  = (0<<CS12)   | (0<<CS11) | (1<<CS10)  // clk/1 (no prescaling) (DS table 12-6)
+          | (0<<WGM13)  | (0<<WGM12)  // phase-correct PWM (DS table 12-5)
+          ;
+
+  // set up e-switch
+  //PORTB = (1 << SWITCH_PIN);  // TODO: configure PORTA / PORTB / PORTC?
+  PUEB = (1 << SWITCH_PIN);  // pull-up for e-switch
+  SWITCH_PCMSK = (1 << SWITCH_PCINT);  // enable pin change interrupt
+}
+
+#define LAYOUT_DEFINED
+
+#endif