Refactored blf-a6 a bunch to export code to includes and make attiny portability a bit better.

Moved MCU hardware options and pin layout to tk-attiny.h.
Moved voltage and OTC hardcoded values to tk-calibration.h.
Moved delay functions to tk-delay.h, and made it use BOGOMIPS instead of DELAY_TWEAK.
Moved voltage ADC and most of the battcheck code to tk-voltage.h.
Changed EEPLEN to EEPSIZE.
Made 1.1V reference symbol consistent across MCUs to avoid repeated #if/#else clauses.

4 files changed, 272 insertions, 0 deletions

diff --git a/tk-attiny.h b/tk-attiny.h
new file mode 100644
index 0000000..003e915
--- /dev/null
+++ b/tk-attiny.h
@@ -0,0 +1,90 @@
+#ifndef TK_ATTINY_H
+#define TK_ATTINY_H
+/*
+ * Attiny portability header.
+ * This helps abstract away the differences between various attiny MCUs.
+ *
+ * Copyright (C) 2015 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+// Choose your MCU here, or in the main .c file, or in the build script
+//#define ATTINY 13
+//#define ATTINY 25
+
+/******************** hardware-specific values **************************/
+#if (ATTINY == 13)
+    #define F_CPU 4800000UL
+    #define EEPSIZE 64
+    #define V_REF REFS0
+    #define BOGOMIPS 950
+#elif (ATTINY == 25)
+    #define F_CPU 8000000UL
+    #define EEPSIZE 128
+    #define V_REF REFS1
+    #define BOGOMIPS 2000
+#else
+    Hey, you need to define ATTINY.
+#endif
+
+
+/******************** I/O pin and register layout ************************/
+#ifdef FET_7135_LAYOUT
+/*
+ *           ----
+ *         -|1  8|- VCC
+ *     OTC -|2  7|- Voltage ADC
+ *  Star 3 -|3  6|- PWM (FET)
+ *     GND -|4  5|- PWM (1x7135)
+ *           ----
+ */
+
+#define STAR2_PIN   PB0     // If this pin isn't used for ALT_PWM
+#define STAR3_PIN   PB4     // pin 3
+
+#define CAP_PIN     PB3     // pin 2, OTC
+#define CAP_CHANNEL 0x03    // MUX 03 corresponds with PB3 (Star 4)
+#define CAP_DIDR    ADC3D   // Digital input disable bit corresponding with PB3
+
+#define PWM_PIN     PB1     // pin 6, FET PWM
+#define PWM_LVL     OCR0B   // OCR0B is the output compare register for PB1
+#define ALT_PWM_PIN PB0     // pin 5, 1x7135 PWM
+#define ALT_PWM_LVL OCR0A   // OCR0A is the output compare register for PB0
+
+#define VOLTAGE_PIN PB2     // pin 7, voltage ADC
+#define ADC_CHANNEL 0x01    // MUX 01 corresponds with PB2
+#define ADC_DIDR    ADC1D   // Digital input disable bit corresponding with PB2
+#define ADC_PRSCL   0x06    // clk/64
+
+#endif  // FET_7135_LAYOUT
+
+#ifdef FERRERO_ROCHER_LAYOUT
+/*
+ *            ----
+ *          -|1  8|- VCC
+ * E-switch -|2  7|- Voltage ADC
+ *  Red LED -|3  6|- PWM
+ *      GND -|4  5|- Green LED
+ *            ----
+ */
+// TODO: fill in this section, update Ferrero_Rocher code to use it.
+#endif  // FERRERO_ROCHER_LAYOUT
+
+#ifndef PWM_LVL
+    Hey, you need to define an I/O pin layout.
+#endif
+
+#endif  // TK_ATTINY_H
diff --git a/tk-calibration.h b/tk-calibration.h
new file mode 100644
index 0000000..37edf76
--- /dev/null
+++ b/tk-calibration.h
@@ -0,0 +1,56 @@
+#ifndef TK_CALIBRATION_H
+#define TK_CALIBRATION_H
+/*
+ * Attiny calibration header.
+ * This allows using a single set of hardcoded values across multiple projects.
+ *
+ * Copyright (C) 2015 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/********************** Voltage ADC calibration **************************/
+// These values were measured using RMM's FET+7135.
+// See battcheck/readings.txt for reference values.
+#define ADC_42          195 // the ADC value we expect for 4.20 volts
+#define ADC_100         195 // the ADC value for 100% full (4.2V resting)
+#define ADC_75          186 // the ADC value for 75% full (4.0V resting)
+#define ADC_50          176 // the ADC value for 50% full (3.8V resting)
+#define ADC_25          162 // the ADC value for 25% full (3.5V resting)
+#define ADC_0           138 // the ADC value for 0% full (3.0V resting)
+#define ADC_LOW         129 // When do we start ramping down (2.8V)
+#define ADC_CRIT        124 // When do we shut the light off (2.7V)
+
+
+/********************** Offtime capacitor calibration ********************/
+// Values are between 1 and 255, and can be measured with offtime-cap.c
+// See battcheck/otc-readings.txt for reference values.
+// These #defines are the edge boundaries, not the center of the target.
+#ifdef OFFTIM3
+// The OTC value 0.5s after being disconnected from power
+// (anything higher than this is a "short press")
+#define CAP_SHORT           190
+// The OTC value 1.5s after being disconnected from power
+// Between CAP_MED and CAP_SHORT is a "medium press"
+#define CAP_MED             94
+// Below CAP_MED is a long press
+#else
+// The OTC value 1.0s after being disconnected from power
+// Anything higher than this is a short press, lower is a long press
+#define CAP_SHORT           115
+#endif
+
+
+#endif  // TK_CALIBRATION_H
diff --git a/tk-delay.h b/tk-delay.h
new file mode 100644
index 0000000..572d75e
--- /dev/null
+++ b/tk-delay.h
@@ -0,0 +1,51 @@
+#ifndef TK_DELAY_H
+#define TK_DELAY_H
+/*
+ * Smaller, more flexible replacement(s) for default _delay_ms() functions.
+ *
+ * Copyright (C) 2015 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifdef OWN_DELAY
+#include "tk-attiny.h"
+#include <util/delay_basic.h>
+// Having own _delay_ms() saves some bytes AND adds possibility to use variables as input
+void _delay_ms(uint16_t n)
+{
+    // TODO: make this take tenths of a ms instead of ms,
+    // for more precise timing?
+    #ifdef USE_FINE_DELAY
+    if (n==0) { _delay_loop_2(BOGOMIPS/3); }
+    else {
+        while(n-- > 0) _delay_loop_2(BOGOMIPS);
+    }
+    #else
+    while(n-- > 0) _delay_loop_2(BOGOMIPS);
+    #endif
+}
+#ifdef USE_DELAY_S
+void _delay_s()  // because it saves a bit of ROM space to do it this way
+{
+    _delay_ms(BOGOMIPS);
+}
+#endif
+#else
+#include <util/delay.h>
+#endif
+
+
+#endif  // TK_DELAY_H
diff --git a/tk-voltage.h b/tk-voltage.h
new file mode 100644
index 0000000..a335447
--- /dev/null
+++ b/tk-voltage.h
@@ -0,0 +1,75 @@
+#ifndef TK_VOLTAGE_H
+#define TK_VOLTAGE_H
+/*
+ * Voltage / battcheck functions.
+ *
+ * Copyright (C) 2015 Selene ToyKeeper
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "tk-attiny.h"
+#include "tk-calibration.h"
+
+#ifdef VOLTAGE_MON
+inline void ADC_on() {
+    // disable digital input on ADC pin to reduce power consumption
+    DIDR0 |= (1 << ADC_DIDR);
+    // 1.1v reference, left-adjust, ADC1/PB2
+    ADMUX  = (1 << V_REF) | (1 << ADLAR) | ADC_CHANNEL;
+    // enable, start, prescale
+    ADCSRA = (1 << ADEN ) | (1 << ADSC ) | ADC_PRSCL;
+}
+
+uint8_t get_voltage() {
+    // Start conversion
+    ADCSRA |= (1 << ADSC);
+    // Wait for completion
+    while (ADCSRA & (1 << ADSC));
+    // Send back the result
+    return ADCH;
+}
+#else
+inline void ADC_off() {
+    ADCSRA &= ~(1<<7); //ADC off
+}
+#endif
+
+#ifdef USE_BATTCHECK
+PROGMEM const uint8_t voltage_blinks[] = {
+              // 0 blinks for less than 1%
+    ADC_0,    // 1 blink  for 1%-25%
+    ADC_25,   // 2 blinks for 25%-50%
+    ADC_50,   // 3 blinks for 50%-75%
+    ADC_75,   // 4 blinks for 75%-100%
+    ADC_100,  // 5 blinks for >100%
+    255,      // Ceiling, don't remove  (6 blinks means "error")
+};
+
+inline uint8_t battcheck() {
+    // Return an int, number of "blinks", for approximate battery charge
+    // Uses the table above for return values
+    uint8_t i, voltage;
+    voltage = get_voltage();
+    // figure out how many times to blink
+    for (i=0;
+         voltage > pgm_read_byte(voltage_blinks + i);
+         i ++) {}
+    return i;
+}
+#endif
+
+
+#endif  // TK_VOLTAGE_H