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Eliminate placeholder dashes on mode toggle by immediately rendering last valid data

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This commit is contained in:
Sebastián Nieto 2026-09-07 21:22:12 -03:00
parent e4daf02c37
commit 449a460f9c
2 changed files with 71 additions and 35 deletions
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38
sketch/obd2_gauge/meter.h
View file

@ -35,6 +35,7 @@ uint8_t pidCurrentSkip[maxpidIndex] = {}; // current skip counter
uint8_t engine_off_count = 0; // counter to indicate engine is off then sleep
float old_data[maxpidIndex] =
{}; // keep old data for each gauge to improve speed for pidIndex 0-6
float last_valid_data[maxpidIndex] = {-999, -999, -999, -999}; // keep last valid reading across view toggles
// backlight variable average counter
uint8_t low_count = 0;
@ -371,6 +372,13 @@ int get7SegWidth(const char *str, uint8_t dW, uint8_t t) {
return total;
}
// Forward declarations
void plotNumeric4(uint8_t cell, float data, int warn, bool digit, String unit);
void plotArc4(uint8_t cell, float data, int warn, int min, int max, bool digit,
String unit);
void plotFullScreen(uint8_t cell, float data, int warn, int min, int max,
bool digit, String unit);
// 4-quadrant Numeric Meter (160x120 px)
void numericMeter4(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
int w = 160;
@ -392,6 +400,13 @@ void numericMeter4(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
// Clear only the body below the header to avoid any header flickering
tft.fillRect(x + 1, y + 25, w - 2, h - 26, TFT_BLACK);
int warn = warningValue[pid].toInt();
bool digit = pidConfig[pid][7].toInt();
if (last_valid_data[cell] != -999) {
old_data[cell] = -999;
plotNumeric4(cell, last_valid_data[cell], warn, digit, unit);
} else {
// Initial placeholder: right-aligned DSEG7 44pt number
tft.loadFont(DSEG7_Modern_BoldItalic_44);
tft.setTextColor(TFT_GREEN, TFT_BLACK);
@ -399,6 +414,7 @@ void numericMeter4(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
tft.drawRightString("---", x + w - 10, y + 46, 1);
tft.setTextPadding(0);
tft.unloadFont();
}
}
void plotNumeric4(uint8_t cell, float data, int warn, bool digit, String unit) {
@ -442,11 +458,20 @@ void arcMeter4(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
// Clear only the body below the header to avoid any header flickering
tft.fillRect(x + 1, y + 25, w - 2, h - 26, TFT_BLACK);
int min = pidConfig[pid][4].toInt();
int max = pidConfig[pid][5].toInt();
bool digit = pidConfig[pid][7].toInt();
int warn = warningValue[pid].toInt();
// Lowered smooth arc track (Center Y = y + 96, R = 66, IR = 54, thickness
// 13px, sweep 130 deg: 115 to 245)
tft.drawSmoothArc(x + 80, y + 96, 66, 54, 115, 245, TFT_DARKGREY, TFT_BLACK,
false);
if (last_valid_data[cell] != -999) {
old_data[cell] = -999;
plotArc4(cell, last_valid_data[cell], warn, min, max, digit, unit);
} else {
// Value placeholder using DSEG7 Modern 24pt smooth font
tft.loadFont(DSEG7_Modern_BoldItalic_24);
tft.setTextColor(TFT_GREEN, TFT_BLACK);
@ -454,6 +479,7 @@ void arcMeter4(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
tft.drawRightString("---", x + 116, y + 86, 1);
tft.setTextPadding(0);
tft.unloadFont();
}
}
void plotArc4(uint8_t cell, float data, int warn, int min, int max, bool digit,
@ -508,6 +534,15 @@ void fullScreenMeter(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
// Clear only below header
tft.fillRect(0, 38, 320, 202, TFT_BLACK);
int min = pidConfig[pid][4].toInt();
int max = pidConfig[pid][5].toInt();
bool digit = pidConfig[pid][7].toInt();
int warn = warningValue[pid].toInt();
if (last_valid_data[cell] != -999) {
old_data[cell] = -999;
plotFullScreen(cell, last_valid_data[cell], warn, min, max, digit, unit);
} else {
if (!cellIsNumeric[cell]) {
// Arc mode full screen
// Large full screen arc (Center: 160, 195, R: 130, IR: 108, thickness 23px,
@ -530,6 +565,7 @@ void fullScreenMeter(uint8_t cell, uint8_t pid, bool redrawHeader = true) {
tft.setTextPadding(0);
tft.unloadFont();
}
}
}
void plotFullScreen(uint8_t cell, float data, int warn, int min, int max,
@ -736,6 +772,8 @@ void updateMeter(uint8_t pidNo, String response) { // update parameter on screen
}
}
last_valid_data[pidNo] = data;
// Engine off check if PCM volt or ATRV
if (pidConfig[pidIdx][2] == "0142" || pidConfig[pidIdx][2] == "ATRV") {
engine_onoff(data, pidNo);

2
sketch/obd2_gauge/obd2_gauge.ino
View file

@ -498,7 +498,6 @@ void loop() {
// In full screen: single click toggles between arc and number mode without header flicker
cellIsNumeric[fullScreenCell] = !cellIsNumeric[fullScreenCell];
fullScreenMeter(fullScreenCell, pidInCell[fullScreenCell], false);
old_data[fullScreenCell] = -999;
} else if (clickQuadrant >= 0 && clickQuadrant < 4) {
// In 4 quadrants: single click toggles between arc and number for this quadrant without header flicker
cellIsNumeric[clickQuadrant] = !cellIsNumeric[clickQuadrant];
@ -508,7 +507,6 @@ void loop() {
} else {
arcMeter4(clickQuadrant, pid, false);
}
old_data[clickQuadrant] = -999;
}
}
//----------------------