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Sensor-Watch/watch-library/hardware/watch/watch_slcd.c
Eli Dowling d0ce60111e
use 0 contrast for custom lcd 
this greatly improves off axis viewing, for an extremely slightly reduction in actual contrast when viewed on axis.
2025-08-08 22:23:33 +10:00

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/*
* MIT License
*
* Copyright (c) 2020-2024 Joey Castillo
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include "delay.h"
#include "usb.h"
#include "pins.h"
#include "watch_slcd.h"
#include "watch_common_display.h"
#include "slcd.h"
#include "tc.h"
#include "adc.h"
//////////////////////////////////////////////////////////////////////////////////////////
// Segmented Display
static uint16_t _slcd_framerate = 0;
static uint16_t _slcd_fc_min_ms_bypass = 0;
static watch_lcd_type_t _installed_display = WATCH_LCD_TYPE_UNKNOWN;
/// NOTE: The function below was commented out because LCD autodetection proved unreliable.
/// While I would love to fix it, I can't figure it out in time for the product launch.
/// Instead, this function simply implements the failsafe: red LED glows until one of two
/// buttons is pressed: bottom left button for classic LCD, bottom right button for custom.
///
void watch_discover_lcd_type(void) {
#if defined(FORCE_CUSTOM_LCD_TYPE)
_installed_display = WATCH_LCD_TYPE_CUSTOM;
_watch_update_indicator_segments();
return;
#elif defined(FORCE_CLASSIC_LCD_TYPE)
_installed_display = WATCH_LCD_TYPE_CLASSIC;
return;
#endif
// Don't bother detecting the LCD type if we're plugged into USB.
if (usb_is_enabled()) return;
// Set red LED to indicate that LED detection is active.
watch_enable_leds();
watch_set_led_color_rgb(16, 0, 0);
// Configure buttons as inputs.
HAL_GPIO_BTN_MODE_in();
HAL_GPIO_BTN_MODE_pulldown();
HAL_GPIO_BTN_ALARM_in();
HAL_GPIO_BTN_ALARM_pulldown();
// Press MODE for classic, ALARM for new. The mnemonic to remember this: left button,
// backwards in time: classic LCD; right button, forward in time: new custom LCD.
while(1) {
if (HAL_GPIO_BTN_MODE_read()) {
_installed_display = WATCH_LCD_TYPE_CLASSIC;
break;
}
if (HAL_GPIO_BTN_ALARM_read()) {
_installed_display = WATCH_LCD_TYPE_CUSTOM;
break;
}
delay_ms(4);
}
// LCD was detected. Kill the LED.
// Don't worry about the buttons, they'll be taken care of later.
watch_set_led_off();
watch_disable_leds();
// Update indicator segment mapping based on the detected display (they are v different).
_watch_update_indicator_segments();
}
/*
void watch_discover_lcd_type(void) {
#if defined(FORCE_CUSTOM_LCD_TYPE)
_installed_display = WATCH_LCD_TYPE_CUSTOM;
goto valid_display_detected;
#elif defined(FORCE_CLASSIC_LCD_TYPE)
_installed_display = WATCH_LCD_TYPE_CLASSIC;
goto valid_display_detected;
#endif
// Don't bother detecting the LCD type if we're plugged into USB.
if (usb_is_enabled()) return;
uint16_t slcd3, slcd4;
int difference;
uint8_t valid_frames_classic = 0;
uint8_t valid_frames_custom = 0;
/// TODO: Test this at lower battery levels. Do the thresholds hold up?
const uint16_t lo_threshold = 12000;
const uint16_t hi_threshold = 32000;
// taking advantage of the fact that LCD segments are like little capacitors,
// we're going to introduce an alternating voltage on SLCD2, or COM2.
HAL_GPIO_SLCD2_out();
// Then we're going to read the voltage on SLCD3 and SLCD4:
// * On classic LCD, we will expect to see the voltage change on SLCD3 (SEG0) and SLCD4 (SEG1)
// * On custom LCD, we will expect to see the voltage change on SLCD4 (SEG1) but not SLCD3 (COM4)
adc_init();
adc_enable();
HAL_GPIO_SLCD3_pmuxen(HAL_GPIO_PMUX_ADC);
HAL_GPIO_SLCD4_pmuxen(HAL_GPIO_PMUX_ADC);
// as a failsafe, we have button inputs: MODE for classic, ALARM for new.
// (think: left button, backwards in time: classic; right button, forward, new: custom)
HAL_GPIO_BTN_MODE_in();
HAL_GPIO_BTN_MODE_pulldown();
HAL_GPIO_BTN_ALARM_in();
HAL_GPIO_BTN_ALARM_pulldown();
/// TODO: Remove this and the watch_set_led_off below; it's here for testing (people will see red if their LCD was undetectable)
watch_set_led_red();
while(1) {
HAL_GPIO_SLCD2_set();
slcd3 = adc_get_analog_value(HAL_GPIO_SLCD3_pin());
slcd4 = adc_get_analog_value(HAL_GPIO_SLCD4_pin());
difference = abs((int)slcd4 - (int)slcd3);
// printf("1, slcd3: %d, slcd4: %d, diff: %d\n", slcd3, slcd4, difference);
if (slcd3 > hi_threshold && slcd4 > hi_threshold && abs(difference) < 1000) {
valid_frames_classic++;
} else if (slcd4 > hi_threshold && abs(difference) > 5000) {
valid_frames_custom++;
}
delay_ms(4);
HAL_GPIO_SLCD2_clr();
slcd3 = adc_get_analog_value(HAL_GPIO_SLCD3_pin());
slcd4 = adc_get_analog_value(HAL_GPIO_SLCD4_pin());
difference = (int)slcd4 - (int)slcd3;
// printf("0, slcd3: %d, slcd4: %d, diff: %d\n", slcd3, slcd4, difference);
if (slcd3 < lo_threshold && slcd4 < lo_threshold && abs(difference) < 100) {
valid_frames_classic++;
} else if (slcd4 < lo_threshold && abs(difference) > 5000) {
valid_frames_custom++;
}
if (valid_frames_classic > 16 || valid_frames_custom > 16) {
break;
}
// The failsafe: if our detection isn't working, the user can tell us which display is installed.
if (HAL_GPIO_BTN_MODE_read()) {
_installed_display = WATCH_LCD_TYPE_CLASSIC;
goto valid_display_detected;
}
if (HAL_GPIO_BTN_ALARM_read()) {
_installed_display = WATCH_LCD_TYPE_CUSTOM;
goto valid_display_detected;
}
delay_ms(4);
}
watch_set_led_off();
HAL_GPIO_SLCD2_off();
HAL_GPIO_SLCD3_off();
HAL_GPIO_SLCD4_off();
adc_disable();
if (valid_frames_classic > 16) {
_installed_display = WATCH_LCD_TYPE_CLASSIC;
} else if (valid_frames_custom > 16) {
_installed_display = WATCH_LCD_TYPE_CUSTOM;
}
valid_display_detected:
_watch_update_indicator_segments();
}
*/
watch_lcd_type_t watch_get_lcd_type(void) {
return _installed_display;
}
void watch_enable_display(void) {
// No need to do anything if the display is already enabled.
/// TODO: Wrap this in a gossamer call.
if (SLCD->CTRLA.bit.ENABLE) return;
watch_discover_lcd_type();
HAL_GPIO_SLCD0_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD1_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD2_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD3_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD4_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD5_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD6_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD7_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD8_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD9_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD10_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD11_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD12_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD13_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD14_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD15_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD16_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD17_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD18_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD19_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD20_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD21_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD22_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD23_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD24_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD25_pmuxen(HAL_GPIO_PMUX_B);
HAL_GPIO_SLCD26_pmuxen(HAL_GPIO_PMUX_B);
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
// Custom LCD: 1/3 bias, 1/4 duty with a frame rate of 32 Hz
slcd_init(LCD_PIN_ENABLE, SLCD_BIAS_THIRD, SLCD_DUTY_4_COMMON, SLCD_CLOCKSOURCE_XOSC, SLCD_PRESCALER_DIV64, SLCD_CLOCKDIV_4);
// exact frame rate is: 32768 / (4 * 64 * 4) ≈ 32 Hz
_slcd_framerate = 32;
} else {
// Original famous Casio LCD: 1/3 bias, 1/3 duty with a frame rate of ~34 Hz
slcd_init(LCD_PIN_ENABLE, SLCD_BIAS_THIRD, SLCD_DUTY_3_COMMON, SLCD_CLOCKSOURCE_XOSC, SLCD_PRESCALER_DIV64, SLCD_CLOCKDIV_5);
// exact frame rate is: 32768 / (3 * 64 * 5) ≈ 34.13 Hz
_slcd_framerate = 34;
}
// calculate the smallest duration we can time before we have to engage the frame counter prescaler bypass
_slcd_fc_min_ms_bypass = 32 * (1000 / _slcd_framerate);
slcd_clear();
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
slcd_set_contrast(0);
} else {
slcd_set_contrast(9);
}
slcd_enable();
}
inline void watch_set_pixel(uint8_t com, uint8_t seg) {
slcd_set_segment(com, seg);
}
inline void watch_clear_pixel(uint8_t com, uint8_t seg) {
slcd_clear_segment(com, seg);
}
void watch_clear_display(void) {
slcd_clear();
}
void watch_start_character_blink(char character, uint32_t duration) {
slcd_set_frame_counter_enabled(0, false);
if (duration <= _slcd_fc_min_ms_bypass) {
slcd_configure_frame_counter(0, (duration / (1000 / _slcd_framerate)) - 1, false);
} else {
slcd_configure_frame_counter(0, ((duration / (1000 / _slcd_framerate)) / 8 - 1), true);
}
slcd_set_frame_counter_enabled(0, true);
watch_display_character(character, 7);
watch_clear_pixel(2, 10); // clear segment B of position 7 since it can't blink
slcd_disable();
slcd_set_blink_enabled(false);
slcd_configure_blink(false, 0x0F, 0x0F, 0);
slcd_set_blink_enabled(true);
slcd_enable();
}
void watch_start_indicator_blink_if_possible(watch_indicator_t indicator, uint32_t duration) {
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
// Indicators can only blink on the custom LCD.
uint8_t mask = 0;
switch (indicator) {
case WATCH_INDICATOR_COLON:
mask = 0b0001;
break;
case WATCH_INDICATOR_LAP:
mask = 0b0010;
break;
case WATCH_INDICATOR_ARROWS:
mask = 0b0100;
break;
case WATCH_INDICATOR_SLEEP:
mask = 0b1000;
break;
default:
return;
}
watch_set_indicator(indicator);
if (duration <= _slcd_fc_min_ms_bypass) {
slcd_configure_frame_counter(0, (duration / (1000 / _slcd_framerate)) - 1, false);
} else {
slcd_configure_frame_counter(0, ((duration / (1000 / _slcd_framerate)) / 8 - 1), true);
}
slcd_set_frame_counter_enabled(0, true);
slcd_disable();
slcd_set_blink_enabled(false);
slcd_configure_blink(false, mask, 0, 0);
slcd_set_blink_enabled(true);
slcd_enable();
}
}
void watch_stop_blink(void) {
slcd_set_frame_counter_enabled(0, false);
slcd_set_blink_enabled(false);
}
void watch_start_sleep_animation(uint32_t duration) {
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
// on pro LCD, we just show the sleep indicator
watch_set_indicator(WATCH_INDICATOR_SLEEP);
} else {
// on classic LCD we do the "tick/tock" animation
watch_display_character(' ', 8);
watch_display_character(' ', 9);
slcd_disable();
slcd_set_frame_counter_enabled(1, false);
slcd_set_circular_shift_animation_enabled(false);
if (duration <= _slcd_fc_min_ms_bypass) {
slcd_configure_frame_counter(1, (duration / (1000 / _slcd_framerate)) - 1, false);
} else {
slcd_configure_frame_counter(1, ((duration / (1000 / _slcd_framerate)) / 8 - 1), true);
}
slcd_set_frame_counter_enabled(1, true);
slcd_configure_circular_shift_animation(0b00000001, 1, SLCD_CSRSHIFT_LEFT, 1);
slcd_set_circular_shift_animation_enabled(true);
slcd_enable();
}
}
bool watch_sleep_animation_is_running(void) {
// TODO: wrap this in gossamer call
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
// COM3, SEG0 contains the half moon icon
return SLCD->SDATAL3.bit.SDATA & 1;
} else {
// CSREN indicates that the tick/tick animation is running
return SLCD->CTRLD.bit.CSREN;
}
}
void watch_stop_sleep_animation(void) {
if (_installed_display == WATCH_LCD_TYPE_CUSTOM) {
watch_clear_indicator(WATCH_INDICATOR_SLEEP);
} else {
slcd_set_circular_shift_animation_enabled(false);
watch_display_character(' ', 8);
}
}
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