Add thefreeman's DAC linear driver (beta); also update Sofirn bilds to use the new 2C_STYLE defines

1 files changed, 109 insertions, 0 deletions

diff --git a/hwdef-thefreeman-lin16dac.h b/hwdef-thefreeman-lin16dac.h
new file mode 100644
index 0000000..0999c4c
--- /dev/null
+++ b/hwdef-thefreeman-lin16dac.h
@@ -0,0 +1,109 @@
+#ifndef HWDEF_THEFREEMAN_LIN18_H
+#define HWDEF_THEFREEMAN_LIN18_H
+
+/* thefreeman's Linear 16 driver using DAC control
+
+PA6 - DAC for LED brightness control
+PA7 - Op-amp enable pin
+PB5 - Aux LED
+PB4 - Switch pin, internal pullup
+PB3 - HDR control, set High to enable the high power channel, set Low for low power
+Read voltage from VCC pin, has PFET so no drop
+
+*/
+
+
+#define LAYOUT_DEFINED
+
+#ifdef ATTINY
+#undef ATTINY
+#endif
+#define ATTINY 1616
+#include <avr/io.h>
+
+#define PWM_CHANNELS 1
+#define USE_DYN_PWM  // dynamic frequency and speed
+
+#ifndef SWITCH_PIN
+#define SWITCH_PIN     PIN4_bp
+#define SWITCH_PORT    VPORTB.IN
+#define SWITCH_ISC_REG PORTB.PIN2CTRL
+#define SWITCH_VECT    PORTB_PORT_vect
+#define SWITCH_INTFLG  VPORTB.INTFLAGS
+#endif
+
+
+#define PWM1_LVL DAC0.DATA  // use this for DAC voltage output
+
+// PWM parameters of both channels are tied together because they share a counter
+#define PWM1_TOP VREF.CTRLA   // holds the TOP value for for variable-resolution PWM
+
+// For enabling / disabling the HDR high-range channel
+#define LED_ENABLE_PIN   PIN3_bp
+#define LED_ENABLE_PORT  PORTB_OUT
+#define LED_ENABLE_PIN_LEVEL_MIN 35
+#define LED_ENABLE_PIN_LEVEL_MAX 150
+
+// For turning on and off the op-amp
+#define LED2_ENABLE_PIN   PIN7_bp
+#define LED2_ENABLE_PORT  PORTA_OUT
+
+
+// average drop across diode on this hardware
+#ifndef VOLTAGE_FUDGE_FACTOR
+#define VOLTAGE_FUDGE_FACTOR 0  // using a PFET so no appreciable drop
+#endif
+
+// lighted button
+#ifndef AUXLED_PIN
+#define AUXLED_PIN  PIN5_bp
+#define AUXLED_PORT PORTB
+#endif
+
+
+// with so many pins, doing this all with #ifdefs gets awkward...
+// ... so just hardcode it in each hwdef file instead
+inline void hwdef_setup() {
+
+    // set up the system clock to run at 10 MHz instead of the default 3.33 MHz
+    // TODO: for this DAC controlled-light, try to decrease the clock speed or use the ULP
+    _PROTECTED_WRITE( CLKCTRL.MCLKCTRLB, CLKCTRL_PDIV_2X_gc | CLKCTRL_PEN_bm );
+
+    VPORTA.DIR = PIN6_bm | PIN7_bm;
+    VPORTB.DIR = PIN3_bm;
+    //VPORTC.DIR = 0b00000000;
+
+    // enable pullups on the input pins to reduce power
+    PORTA.PIN0CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN1CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN2CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN3CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN4CTRL = PORT_PULLUPEN_bm;
+    PORTA.PIN5CTRL = PORT_PULLUPEN_bm;
+    //PORTA.PIN6CTRL = PORT_PULLUPEN_bm;  // DAC ouput
+    //PORTA.PIN7CTRL = PORT_PULLUPEN_bm;  // Op-amp enable pin
+
+    PORTB.PIN0CTRL = PORT_PULLUPEN_bm;
+    PORTB.PIN1CTRL = PORT_PULLUPEN_bm;
+    PORTB.PIN2CTRL = PORT_PULLUPEN_bm; 
+    //PORTB.PIN3CTRL = PORT_PULLUPEN_bm;  // HDR channel selection
+    PORTB.PIN4CTRL = PORT_PULLUPEN_bm | PORT_ISC_BOTHEDGES_gc;  // switch
+    //PORTB.PIN5CTRL = PORT_PULLUPEN_bm;  // Aux LED
+
+    PORTC.PIN0CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN1CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN2CTRL = PORT_PULLUPEN_bm;
+    PORTC.PIN3CTRL = PORT_PULLUPEN_bm;
+
+    // set up the DAC
+    // https://ww1.microchip.com/downloads/en/DeviceDoc/ATtiny1614-16-17-DataSheet-DS40002204A.pdf
+    // DAC ranges from 0V to (255 * Vref) / 256
+    VREF.CTRLA |= VREF_DAC0REFSEL_2V5_gc; // also VREF_DAC0REFSEL_0V55_gc and VREF_DAC0REFSEL_1V1_gc and VREF_DAC0REFSEL_2V5_gc 
+    VREF.CTRLB |= VREF_DAC0REFEN_bm;
+    DAC0.CTRLA = DAC_ENABLE_bm | DAC_OUTEN_bm;
+    DAC0.DATA = 255; // set the output voltage
+
+}
+
+
+#endif