simplify battery calculation for now

keyboards/handwired/promethium/config.h

@@ -43,28 +43,97 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define MATRIX_ROW_PINS { D7, C6, D0, D1, F5, F4, F1, F0 }
 #define UNUSED_PINS
 
-/* COL2ROW or ROW2COL */
+/*
+ * Keyboard Matrix Assignments
+ *
+ * Change this to how you wired your keyboard
+ * COLS: AVR pins used for columns, left to right
+ * ROWS: AVR pins used for rows, top to bottom
+ * DIODE_DIRECTION: COL2ROW = COL = Anode (+), ROW = Cathode (-, marked on diode)
+ *                  ROW2COL = ROW = Anode (+), COL = Cathode (-, marked on diode)
+ *
+*/
 #define DIODE_DIRECTION COL2ROW
 
-/* define if matrix has ghost */
+// #define BACKLIGHT_PIN B7
+// #define BACKLIGHT_BREATHING
+// #define BACKLIGHT_LEVELS 3
+
+/* Debounce reduces chatter (unintended double-presses) - set 0 if debouncing is not needed */
+#define DEBOUNCING_DELAY 5
+
+/* define if matrix has ghost (lacks anti-ghosting diodes) */
 //#define MATRIX_HAS_GHOST
 
 /* number of backlight levels */
-#define BACKLIGHT_LEVELS 3
-
-/* Set 0 if debouncing isn't needed */
-#define DEBOUNCING_DELAY 5
 
 /* Mechanical locking support. Use KC_LCAP, KC_LNUM or KC_LSCR instead in keymap */
-#define LOCKING_SUPPORT_ENABLE
+// #define LOCKING_SUPPORT_ENABLE
 /* Locking resynchronize hack */
-#define LOCKING_RESYNC_ENABLE
+// #define LOCKING_RESYNC_ENABLE
+
+/*
+ * Force NKRO
+ *
+ * Force NKRO (nKey Rollover) to be enabled by default, regardless of the saved
+ * state in the bootmagic EEPROM settings. (Note that NKRO must be enabled in the
+ * makefile for this to work.)
+ *
+ * If forced on, NKRO can be disabled via magic key (default = LShift+RShift+N)
+ * until the next keyboard reset.
+ *
+ * NKRO may prevent your keystrokes from being detected in the BIOS, but it is
+ * fully operational during normal computer usage.
+ *
+ * For a less heavy-handed approach, enable NKRO via magic key (LShift+RShift+N)
+ * or via bootmagic (hold SPACE+N while plugging in the keyboard). Once set by
+ * bootmagic, NKRO mode will always be enabled until it is toggled again during a
+ * power-up.
+ *
+ */
+//#define FORCE_NKRO
 
 /* key combination for command */
 #define IS_COMMAND() ( \
     keyboard_report->mods == (MOD_BIT(KC_LSHIFT) | MOD_BIT(KC_RSHIFT) | MOD_BIT(KC_LCTRL) | MOD_BIT(KC_RCTRL)) \
 )
 
+/* control how magic key switches layers */
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS  true
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS  true
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM false
+
+/* override magic key keymap */
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_FKEYS
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_NKEYS
+//#define MAGIC_KEY_SWITCH_LAYER_WITH_CUSTOM
+//#define MAGIC_KEY_HELP1          H
+//#define MAGIC_KEY_HELP2          SLASH
+//#define MAGIC_KEY_DEBUG          D
+//#define MAGIC_KEY_DEBUG_MATRIX   X
+//#define MAGIC_KEY_DEBUG_KBD      K
+//#define MAGIC_KEY_DEBUG_MOUSE    M
+//#define MAGIC_KEY_VERSION        V
+//#define MAGIC_KEY_STATUS         S
+//#define MAGIC_KEY_CONSOLE        C
+//#define MAGIC_KEY_LAYER0_ALT1    ESC
+//#define MAGIC_KEY_LAYER0_ALT2    GRAVE
+//#define MAGIC_KEY_LAYER0         0
+//#define MAGIC_KEY_LAYER1         1
+//#define MAGIC_KEY_LAYER2         2
+//#define MAGIC_KEY_LAYER3         3
+//#define MAGIC_KEY_LAYER4         4
+//#define MAGIC_KEY_LAYER5         5
+//#define MAGIC_KEY_LAYER6         6
+//#define MAGIC_KEY_LAYER7         7
+//#define MAGIC_KEY_LAYER8         8
+//#define MAGIC_KEY_LAYER9         9
+//#define MAGIC_KEY_BOOTLOADER     PAUSE
+//#define MAGIC_KEY_LOCK           CAPS
+//#define MAGIC_KEY_EEPROM         E
+//#define MAGIC_KEY_NKRO           N
+//#define MAGIC_KEY_SLEEP_LED      Z
+
 /*
  * Feature disable options
  *  These options are also useful to firmware size reduction.

keyboards/handwired/promethium/keymaps/priyadi/keymap.c

@@ -987,8 +987,8 @@ void matrix_scan_user(void) {
   led_set_layer_indicator();
 }
 
-void battery_poll(float percentage) {
+void battery_poll(uint8_t level) {
-  rgbsps_sethsv(LED_IND_BATTERY, percentage*120/100, 255, 15);
+  rgbsps_sethsv(LED_IND_BATTERY, level * 120/255, 255, 15);
   rgbsps_send();
 }
 

keyboards/handwired/promethium/promethium.c

@@ -3,20 +3,17 @@
 #include "timer.h"
 #include "matrix.h"
 
-float battery_percentage(void) {
+// cubic fit {3.3, 0}, {3.5, 2.9}, {3.6, 5}, {3.7, 8.6}, {3.8, 36},  {3.9, 62}, {4.0, 73}, {4.05, 83}, {4.1, 89}, {4.15, 94}, {4.2, 100}
+
+uint8_t battery_level(void) {
     float voltage = analogRead(BATTERY_PIN) * 2 * 3.3 / 1024;
-    float percentage = (voltage - 3.5) * 143;
+    if (voltage < MIN_VOLTAGE) return 0;
-    if (percentage > 100) {
+    if (voltage > MAX_VOLTAGE) return 255;
-        return 100;
+    return (voltage - MIN_VOLTAGE) / (MAX_VOLTAGE - MIN_VOLTAGE) * 255;
-    } else if (percentage < 0) {
-        return 0;
-    } else {
-        return percentage;
-    }
 }
 
 __attribute__ ((weak))
-void battery_poll(float percentage) {
+void battery_poll(uint8_t level) {
 }
 
 void matrix_init_kb(void) {
@@ -29,7 +26,7 @@ void matrix_scan_kb(void) {
 
     if (counter > BATTERY_POLL) {
         counter = 0;
-        battery_poll(battery_percentage());
+        battery_poll(battery_level());
     }
 
     matrix_scan_user();

keyboards/handwired/promethium/promethium.h

@@ -7,6 +7,8 @@
 #define UNICODE_TYPE_DELAY 0
 #define BATTERY_PIN 9
 #define BATTERY_POLL 30000
+#define MAX_VOLTAGE 4.2
+#define MIN_VOLTAGE 3.2
 
 #define KEYMAP( \
     k11, k12, k13, k14, k15, k16, k17, k18, k19, k1a, k1b, k1c, \
@@ -103,4 +105,4 @@ enum led_sequence {
 
 #endif
 
-void battery_poll(float percentage);
+void battery_poll(uint8_t level);