From 73a5a6974a98aa73ab392272b4d69d285c85dee5 Mon Sep 17 00:00:00 2001
From: Selene ToyKeeper
Date: Sat, 19 Aug 2017 17:20:46 -0600
Subject: Completely reorganized SpaghettiMonster code into smaller logical
 pieces: fsm-*.c and fsm-*.h.

---
 spaghetti-monster/fsm-adc.c | 136 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 spaghetti-monster/fsm-adc.c

(limited to 'spaghetti-monster/fsm-adc.c')

diff --git a/spaghetti-monster/fsm-adc.c b/spaghetti-monster/fsm-adc.c
new file mode 100644
index 0000000..11468b9
--- /dev/null
+++ b/spaghetti-monster/fsm-adc.c
@@ -0,0 +1,136 @@
+/*
+ * fsm-adc.c: ADC (voltage, temperature) functions for SpaghettiMonster.
+ *
+ * Copyright (C) 2017 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/>.
+ */
+
+#ifndef FSM_ADC_C
+#define FSM_ADC_C
+
+inline void ADC_on()
+{
+    // read voltage on VCC by default
+    // disable digital input on VCC pin to reduce power consumption
+    //DIDR0 |= (1 << ADC_DIDR);  // FIXME: unsure how to handle for VCC pin
+    // VCC / 1.1V reference
+    ADMUX = ADMUX_VCC;
+    // enable, start, prescale
+    ADCSRA = (1 << ADEN) | (1 << ADSC) | ADC_PRSCL;
+}
+
+inline void ADC_off() {
+    ADCSRA &= ~(1<<ADEN); //ADC off
+}
+
+// TODO: is this better done in main() or WDT()?
+ISR(ADC_vect) {
+    static uint8_t adc_step = 0;
+    #ifdef USE_LVP
+    #ifdef USE_LVP_AVG
+    #define NUM_VOLTAGE_VALUES 4
+    static int16_t voltage_values[NUM_VOLTAGE_VALUES];
+    #endif
+    static uint8_t lvp_timer = 0;
+    static uint8_t lvp_lowpass = 0;
+    #define LVP_TIMER_START 50  // ticks between LVP warnings
+    #define LVP_LOWPASS_STRENGTH 4
+    #endif
+
+    #ifdef USE_THERMAL_REGULATION
+    #define NUM_THERMAL_VALUES 4
+    #define ADC_STEPS 4
+    static int16_t temperature_values[NUM_THERMAL_VALUES];
+    #else
+    #define ADC_STEPS 2
+    #endif
+
+    uint16_t measurement = ADC;  // latest 10-bit ADC reading
+
+    adc_step = (adc_step + 1) & (ADC_STEPS-1);
+
+    #ifdef USE_LVP
+    // voltage
+    if (adc_step == 1) {
+        #ifdef USE_LVP_AVG
+        // prime on first execution
+        if (voltage == 0) {
+            for(uint8_t i=0; i<NUM_VOLTAGE_VALUES; i++)
+                voltage_values[i] = measurement;
+            voltage = 42;  // Life, the Universe, and Everything (*)
+        } else {
+            uint16_t total = 0;
+            uint8_t i;
+            for(i=0; i<NUM_VOLTAGE_VALUES-1; i++) {
+                voltage_values[i] = voltage_values[i+1];
+                total += voltage_values[i];
+            }
+            voltage_values[i] = measurement;
+            total += measurement;
+            total = total >> 2;
+
+            voltage = (uint16_t)(1.1*1024*10)/total + VOLTAGE_FUDGE_FACTOR;
+        }
+        #else  // no USE_LVP_AVG
+        // calculate actual voltage: volts * 10
+        // ADC = 1.1 * 1024 / volts
+        // volts = 1.1 * 1024 / ADC
+        voltage = (uint16_t)(1.1*1024*10)/measurement + VOLTAGE_FUDGE_FACTOR;
+        #endif
+        // if low, callback EV_voltage_low / EV_voltage_critical
+        //         (but only if it has been more than N ticks since last call)
+        if (lvp_timer) {
+            lvp_timer --;
+        } else {  // it has been long enough since the last warning
+            if (voltage < VOLTAGE_LOW) {
+                if (lvp_lowpass < LVP_LOWPASS_STRENGTH) {
+                    lvp_lowpass ++;
+                } else {
+                    // try to send out a warning
+                    //uint8_t err = emit(EV_voltage_low, 0);
+                    //uint8_t err = emit_now(EV_voltage_low, 0);
+                    emit(EV_voltage_low, 0);
+                    //if (!err) {
+                        // on successful warning, reset counters
+                        lvp_timer = LVP_TIMER_START;
+                        lvp_lowpass = 0;
+                    //}
+                }
+            } else {
+                // voltage not low?  reset count
+                lvp_lowpass = 0;
+            }
+        }
+    }
+    #endif  // ifdef USE_LVP
+
+    // TODO: temperature
+
+    // start another measurement for next time
+    #ifdef USE_THERMAL_REGULATION
+        #ifdef USE_LVP
+        if (adc_step < 2) ADMUX = ADMUX_VCC;
+        else ADMUX = ADMUX_THERM;
+        #else
+        ADMUX = ADMUX_THERM;
+        #endif
+    #else
+        #ifdef USE_LVP
+        ADMUX = ADMUX_VCC;
+        #endif
+    #endif
+}
+
+#endif
-- 
cgit v1.2.3