usv/h and other improvements, use float

src/graphic_empty_battery.c

@@ -0,0 +1,71 @@
+/**
+ * Empty battery
+ */
+
+#include <stdint.h>
+#include "ssd1306.h"
+#include "user_interface.h"
+
+void show_empty_battery()
+{
+    ssd1306_clearScreen();
+
+    //     *********
+    //  ****       *
+    //  ****     x *
+    //  ****       *
+    //     *********
+
+#define capwid 6
+#define hei 24
+#define caphei 12
+#define wid 50
+#define thic 2
+#define inpad 2
+#define charge 2
+
+#define ofsx ((DISPLAY_W - capwid - wid)/2)
+#define ofsy ((DISPLAY_H - hei)/2)
+
+    const uint8_t rects[6][4] = {
+            // cap
+            {
+                    0, (hei - caphei) / 2,
+                    capwid - 1, hei - (hei - caphei) / 2 - 1
+            },
+            // left line
+            {
+                    capwid, 0,
+                    capwid+thic - 1, hei - 1
+            },
+            // top line
+            {
+                    capwid + thic, 0,
+                    capwid + wid - thic - 1, thic - 1
+            },
+            // right line
+            {
+                    capwid + wid - thic, 0,
+                    capwid + wid - 1, hei - 1
+            },
+            // "remaining charge" line
+            {
+                    capwid + wid - thic - inpad - charge, thic + inpad,
+                    capwid + wid - thic - inpad - 1, hei - thic - inpad - 1
+            },
+            // bottom line
+            {
+                    capwid + thic, hei - thic,
+                    capwid + wid - thic - 1, hei - 1
+            }
+    };
+
+    for (int i = 0; i < 6; i++) {
+        ssd1306_fillRect(
+                ofsx + rects[i][0],
+                ofsy + rects[i][1],
+                ofsx + rects[i][2],
+                ofsy + rects[i][3]
+        );
+    }
+}

src/graphic_loading.c

@@ -0,0 +1,65 @@
+/**
+ * Loading
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include "ssd1306.h"
+#include "user_interface.h"
+
+
+void show_loading_screen(uint8_t progress_percent, bool clear)
+{
+    if (clear) {
+        ssd1306_clearScreen();
+    }
+
+    // bar in a box
+
+#define hei 20
+#define wid DISPLAY_W
+#define thic 2
+#define inpad 3
+
+#define ofsx ((DISPLAY_W - wid)/2)
+#define ofsy ((DISPLAY_H - hei)/2)
+
+    const uint8_t rects[4][4] = {
+            // top
+            {
+                    0, 0,
+                    wid - 1, thic - 1
+            },
+            // left
+            {
+                    0, thic,
+                    thic - 1, hei - thic - 1
+            },
+            // right
+            {
+                    wid - thic, thic,
+                    wid - 1, hei - thic - 1
+            },
+            // bot
+            {
+                    0, hei - thic,
+                    wid - 1, hei - 1
+            },
+    };
+
+    for (int i = 0; i < 4; i++) {
+        ssd1306_fillRect(
+                ofsx + rects[i][0],
+                ofsy + rects[i][1],
+                ofsx + rects[i][2],
+                ofsy + rects[i][3]
+        );
+    }
+//
+    ssd1306_fillRect(
+            ofsx + thic + inpad,
+            ofsy + thic + inpad,
+            ofsx + (uint8_t)(((uint16_t)wid * (uint16_t)progress_percent)/(uint16_t)100) - thic - inpad - 1,
+            ofsy + hei - thic - inpad - 1
+    );
+}

src/high_voltage.c

@@ -12,8 +12,8 @@
 static volatile bool is_pwm_on = false;
 
 // tube starting voltage is 350V
-#define TURN_ON_VOLTAGE 355.0
-#define TURN_OFF_VOLTAGE 380.0
+#define TURN_ON_VOLTAGE 360.0
+#define TURN_OFF_VOLTAGE 390.0
 #define MINIMAL_VOLTAGE 350.0
 
 // sensing via resistive divider

src/main.c

@@ -19,6 +19,8 @@ void __attribute__((noreturn)) main()
 {
     init_user_interface();
 
+    show_loading_screen(0, true);
+
     init_timebase();
     init_radiation();
 
@@ -54,10 +56,13 @@ void __attribute__((noreturn)) shutdown_due_to_weak_battery()
     cli();
     hv_disable();
 
-    show_empty_battery_icon();
+    show_empty_battery();
     // try to preserve power; but the display will still drain the battery.
     // we should probably shut it off too.
 
+    _delay_ms(2000);
+    turn_off_display();
+
     for (;;) {
         sleep_enable();
         sleep_cpu();

src/radiation.c

@@ -8,23 +8,35 @@
 #include "iopins.h"
 
 #include <avr/interrupt.h>
-#include <stdbool.h>
+#include <util/atomic.h>
 #include <stdint.h>
 #include <string.h>
+#include <math.h>
 
 #define MEAS_BIN_COUNT 120
-typedef uint8_t meas_bin_t;
-#define MEAS_MAX_COUNT 255
+typedef uint8_t ticks_t;
+typedef uint8_t binnum_t;
+#define TICKS_MAX 255
+
+#define NEEDED_TICKS_FOR_VALUE_DISPLAY 5
+
+#define TICKS_NEEDED_FOR_AUTORANGE 15
+
+uint16_t get_tick_count_in_bins(binnum_t bincount);
 
 /// measurements in the last X seconds
-static volatile meas_bin_t measurements[MEAS_BIN_COUNT];
+static volatile ticks_t measurements[MEAS_BIN_COUNT];
 /// Currently active measurement bin, increments once per second
-static volatile uint8_t meas_bin = 0;
+static volatile binnum_t meas_bin = 0;
+static volatile binnum_t meas_oldest_bin = 0;
+static volatile binnum_t num_live_bins = 1;
+
+static volatile binnum_t num_observed_bins = 60;
 
 // geiger tube pin change interrupt
 ISR(INT0_vect)
 {
-    if (measurements[meas_bin] < MEAS_MAX_COUNT) {
+    if (measurements[meas_bin] < TICKS_MAX) {
         measurements[meas_bin]++;
     }
     req_update_display = true;
@@ -33,11 +45,41 @@ ISR(INT0_vect)
 void second_callback_irq()
 {
     meas_bin++;
+    if (num_live_bins < MEAS_BIN_COUNT) {
+        num_live_bins++;
+    }
     if (meas_bin >= MEAS_BIN_COUNT) {
         meas_bin = 0;
     }
+
+    if (meas_oldest_bin == meas_bin) {
+        meas_oldest_bin++;
+        if (meas_oldest_bin >= MEAS_BIN_COUNT) {
+            meas_oldest_bin = 0;
+        }
+    }
+
     measurements[meas_bin] = 0;
     req_update_display = true;
+
+    /* autoranging */
+
+    uint16_t count;
+    bool found_range = 0;
+    for (int i = 5; i <= 60; i += 5) {
+        count = get_tick_count_in_bins(i);
+        if (count > TICKS_NEEDED_FOR_AUTORANGE) {
+            num_observed_bins = i * 2;
+            if (num_observed_bins > num_live_bins) {
+                num_observed_bins = num_live_bins;
+            }
+            found_range = true;
+            break;
+        }
+    }
+    if (!found_range) {
+        num_observed_bins = num_live_bins;
+    }
 }
 
 void init_radiation() {
@@ -50,3 +92,89 @@ void init_radiation() {
     EICRA = _BV(ISC01) | _BV(ISC00); // rising edge
     EIMSK = _BV(INT0);
 }
+
+uint8_t rad_get_progress() {
+    ticks_t ticks = get_tick_count_in_bins(num_live_bins);
+
+    if (ticks >= NEEDED_TICKS_FOR_VALUE_DISPLAY) {
+        return 100;
+    }
+
+    return (((uint16_t)ticks * 100) / (uint16_t)NEEDED_TICKS_FOR_VALUE_DISPLAY);
+}
+
+uint16_t get_tick_count_in_bins(binnum_t bincount) {
+    if (bincount == 0) {
+        return 0;
+    }
+
+    uint16_t all_ticks = 0;
+
+    ATOMIC_BLOCK(ATOMIC_RESTORESTATE) {
+
+        // going backwards
+        binnum_t bin = meas_bin;
+        for (;;) {
+            ticks_t in_bin = measurements[bin];
+            if ((0xFFFF - all_ticks) < in_bin) {
+                all_ticks = 0xFFFF;
+            } else {
+                all_ticks += in_bin;
+            }
+
+            if (bin == meas_oldest_bin) {
+                break;
+            }
+
+            if (bincount > 0) {
+                bincount--;
+                if (bincount == 0) {
+                    break;
+                }
+            }
+
+            if (bin > 0) {
+                bin--;
+            } else {
+                bin = MEAS_BIN_COUNT - 1;
+            }
+        }
+    }
+
+    return all_ticks;
+}
+
+uint16_t rad_get_cpm() {
+    // bins take 1 second
+
+    float count = get_tick_count_in_bins(num_observed_bins);
+    float cpm = (count / (float)num_observed_bins) * 60.0f;
+    return (uint16_t) roundf(cpm * 10.0f);
+}
+
+uint16_t rad_get_usvh(uint8_t *out_decimals) {
+    float count = get_tick_count_in_bins(num_observed_bins);
+    float cpm = (count / (float)num_observed_bins) * 60.0f;
+
+    // https://sites.google.com/site/diygeigercounter/technical/gm-tubes-supported
+
+    float usvh = (cpm / 153.8f);
+
+    if (usvh < 99.0f) {
+        *out_decimals = 3;
+        return (uint16_t) roundf(usvh * 1000.0f);
+    }
+
+    if (usvh < 999.0f) {
+        *out_decimals = 2;
+        return (uint16_t) roundf(usvh * 100.0f);
+    }
+
+    if (usvh < 9999.0f) {
+        *out_decimals = 1;
+        return (uint16_t) roundf(usvh * 10.0f);
+    }
+
+    *out_decimals = 0;
+    return (uint16_t) roundf(usvh);
+}

src/radiation.h

@@ -5,6 +5,17 @@
 #ifndef CPROJ_RADIATION_H
 #define CPROJ_RADIATION_H
 
+#include <stdbool.h>
+#include <stdint.h>
+
 void init_radiation();
 
+/// get progress 0-100, 100 = normal radiation resumed
+uint8_t rad_get_progress();
+
+
+uint16_t rad_get_cpm();
+/// Get current radiation dose rate u uSv/h, x10 (one decimal place)
+uint16_t rad_get_usvh(uint8_t *out_decimals);
+
 #endif //CPROJ_RADIATION_H

src/time_base.c

@@ -3,8 +3,10 @@
  */
 
 #include "time_base.h"
+#include "global_state.h"
 
 #include <stdint.h>
+#include <stdbool.h>
 #include <avr/interrupt.h>
 
 /// timestamp counted in units of 100ms
@@ -17,6 +19,9 @@ ISR(TIMER1_COMPA_vect)
 {
     timestamp_100ms++;
 
+
+    req_update_display = true;
+
     subsec_counter++;
     if (subsec_counter == 10) {
         subsec_counter = 0;

src/user_interface.c

@@ -7,6 +7,9 @@
 #include "ssd1306.h"
 #include "sevenseg.h"
 #include "global_state.h"
+#include "radiation.h"
+
+static bool ended_loading = false;
 
 static struct SevenSeg sseg = {
         .x0 = 0,
@@ -18,31 +21,56 @@ static struct SevenSeg sseg = {
         .spacing = 4,
 };
 
+void clear_screen()
+{
+    ssd1306_clearScreen();
+}
+
 void init_user_interface()
 {
     TWI_Init();
     ssd1306_128x32_i2c_init();
     ssd1306_clearScreen();
-
-    // can't show anything useful at least until the first tick arrives, but more than 1 tick is needed
-    show_loading_icon();
 }
 
+void turn_off_display() {
+    ssd1306_displayOff();
+}
 
+static volatile uint16_t last_value = 0;
+static volatile uint16_t last_value_d = 0;
 void show_current_radiation()
 {
-    // TODO
-    sseg_number(&sseg, timestamp_100ms, 5, 0);
-}
+    // this is called from main, so we can sleep
 
-void show_empty_battery_icon()
-{
-    // TODO
-    sseg_number(&sseg, 9999, 5, 0);
-}
+    if (!ended_loading) {
+        int progress = rad_get_progress();
+        if (progress == 100) {
+            show_loading_screen(100, false);
+            ended_loading = true;
 
-void show_loading_icon()
-{
-    // TODO
-    sseg_number(&sseg, 0, 5, 0);
+            // so user sees it
+            _delay_ms(250);
+
+            clear_screen();
+            // start showing values
+        } else {
+            if (progress < 10) progress = 10;
+            show_loading_screen(progress, false);
+            return;
+        }
+    }
+
+//    uint16_t cpm = rad_get_cpm();
+//    if (cpm != last_value) {
+//        last_value = cpm;
+//        sseg_number(&sseg, cpm, 5, 1);
+//    }
+    uint8_t decimals = 0;
+    uint16_t usvh = rad_get_usvh(&decimals);
+    if (usvh != last_value || decimals != last_value_d) {
+        last_value = usvh;
+        last_value_d = decimals;
+        sseg_number(&sseg, usvh, 5, decimals);
+    }
 }

src/user_interface.h

@@ -5,12 +5,22 @@
 #ifndef CPROJ_USER_INTERFACE_H
 #define CPROJ_USER_INTERFACE_H
 
+#define DISPLAY_W 128
+#define DISPLAY_H 32
+
+#include <stdint.h>
+#include <stdbool.h>
+
+void clear_screen();
+
 void init_user_interface();
 
 void show_current_radiation();
 
-void show_empty_battery_icon();
+void show_empty_battery();
+
+void show_loading_screen(uint8_t progress_percent, bool clear);
 
-void show_loading_icon();
+void turn_off_display();
 
 #endif //CPROJ_USER_INTERFACE_H