ESP32_Scope/ESP32_Oscilloscope/screen.ino
2024-02-04 19:53:17 +01:00

300 lines
9.4 KiB
C++

void setup_screen() {
// Initialise the TFT registers
tft.init();
tft.setRotation(3);
// Optionally set colour depth to 8 or 16 bits, default is 16 if not spedified
spr.setColorDepth(8);
// Create a sprite of defined size
spr.createSprite(DISPLAY_WIDTH, DISPLAY_HEIGHT);
// Clear the TFT screen to blue
tft.fillScreen(TFT_BLACK);
}
int data[DISPLAY_WIDTH] = {0};
/*
float to_scale(float reading) {
float temp = DISPLAY_HEIGHT -
(
(
(
(float)((reading - 20480.0) / 4095.0)
+ (offset / 3.3)
)
* 3300 /
(v_div * 6)
)
)
* (DISPLAY_HEIGHT - 1)
- 1;
return temp;
}
*/
float to_scale(float reading) {
float temp = DISPLAY_HEIGHT - (((reading / 4095.0) + (offset / 3.3)) * 3300 / (v_div * 6)) * (DISPLAY_HEIGHT - 1) - 1;
return temp;
}
/*
float to_voltage(float reading) {
return (reading - 20480.0) / 4095.0 * 3.3;
}
*/
float to_voltage(float reading) {
return reading / 4095.0 * 3.3;
}
/*
uint32_t from_voltage(float voltage) {
return uint32_t(voltage / 3.3 * 4095 + 20480.0);
}
*/
uint32_t from_voltage(float voltage) {
return ((uint32_t)(voltage / 3.3 * 4095));
}
void update_screen(uint16_t *i2s_buff, float sample_rate) {
float mean = 0;
float max_v, min_v;
peak_mean(i2s_buff, BUFF_SIZE, &max_v, &min_v, &mean);
float freq = 0;
float period = 0;
uint32_t trigger0 = 0;
uint32_t trigger1 = 0;
//if analog mode OR auto mode and wave recognized as analog
bool digital_data = false;
if (digital_wave_option == 1) {
trigger_freq_analog(i2s_buff, sample_rate, mean, max_v, min_v, &freq, &period, &trigger0, &trigger1);
}
else if (digital_wave_option == 0) {
digital_data = digital_analog(i2s_buff, max_v, min_v);
if (!digital_data) {
trigger_freq_analog(i2s_buff, sample_rate, mean, max_v, min_v, &freq, &period, &trigger0, &trigger1);
}
else {
trigger_freq_digital(i2s_buff, sample_rate, mean, max_v, min_v, &freq, &period, &trigger0);
}
}
else {
trigger_freq_digital(i2s_buff, sample_rate, mean, max_v, min_v, &freq, &period, &trigger0);
}
draw_sprite(freq, period, mean, max_v, min_v, trigger0, sample_rate, digital_data, true);
}
void draw_sprite(float freq,
float period,
float mean,
float max_v,
float min_v,
uint32_t trigger,
float sample_rate,
bool digital_data,
bool new_data
) {
max_v = to_voltage(max_v);
min_v = to_voltage(min_v);
String frequency = "";
if (freq < 1000)
frequency = String(freq) + "hz";
else if (freq < 100000)
frequency = String(freq / 1000) + "khz";
else
frequency = "----";
String s_mean = "";
if (mean > 1.0)
s_mean = "Avg: " + String(mean) + "V";
else
s_mean = "Avg: " + String(mean * 1000.0) + "mV";
String str_filter = "";
if (current_filter == 0)
str_filter = "None";
else if (current_filter == 1)
str_filter = "Pixel";
else if (current_filter == 2)
str_filter = "Mean-5";
else if (current_filter == 3)
str_filter = "Lpass9";
String str_stop = "";
if (!stop)
str_stop = "RUNNING";
else
str_stop = "STOPPED";
String wave_option = "";
if (digital_wave_option == 0)
if (digital_data )
wave_option = "AUTO:Dig./data";
else
wave_option = "AUTO:Analog";
else if (digital_wave_option == 1)
wave_option = "MODE:Analog";
else
wave_option = "MODE:Dig./data";
if (new_data) {
// Fill the whole sprite with black (Sprite is in memory so not visible yet)
spr.fillSprite(TFT_BLACK);
draw_grid();
if (auto_scale) {
auto_scale = false;
v_div = 1000.0 * max_v / 6.0;
s_div = period / 3.5;
if (s_div > 7000 || s_div <= 0)
s_div = 7000;
if (v_div <= 0)
v_div = 550;
}
//only draw digital data if a trigger was in the data
if (!(digital_wave_option == 2 && trigger == 0))
draw_channel1(trigger, 0, i2s_buff, sample_rate);
}
int shift = DISPLAY_WIDTH - 110;
if (menu) {
spr.drawLine( 0, DISPLAY_HEIGHT/2, DISPLAY_WIDTH, DISPLAY_HEIGHT/2, TFT_WHITE); //center line
spr.fillRect(shift, 0, (DISPLAY_HEIGHT/2)-18, (DISPLAY_HEIGHT/2)+15, TFT_BLACK);
spr.drawRect(shift, 0, (DISPLAY_HEIGHT/2)-18, (DISPLAY_HEIGHT/2)+15, TFT_WHITE);
spr.fillRect(shift + 1, 3 + 10 * (opt - 1), 100, 11, TFT_RED);
spr.drawString("AUTOSCALE", shift + 5, 5);
spr.drawString(String(int(v_div)) + "mV/div", shift + 5, 15);
spr.drawString(String(int(s_div)) + "uS/div", shift + 5, 25);
spr.drawString("Offset: " + String(offset) + "V", shift + 5, 35);
spr.drawString("T-Off: " + String((uint32_t)toffset) + "uS", shift + 5, 45);
spr.drawString("Filter: " + str_filter, shift + 5, 55);
spr.drawString(str_stop, shift + 5, 65);
spr.drawString(wave_option, shift + 5, 75);
spr.drawString("Single " + String(single_trigger ? "ON" : "OFF"), shift + 5, 85);
spr.drawLine(shift, 103, shift + 100, 103, TFT_WHITE);
spr.drawString("Vmax: " + String(max_v) + "V", shift + 5, 105);
spr.drawString("Vmin: " + String(min_v) + "V", shift + 5, 115);
spr.drawString(s_mean, shift + 5, 125);
shift -= 70;
//spr.fillRect(shift, 0, 70, 30, TFT_BLACK);
spr.drawRect(shift, 0, 70, 30, TFT_WHITE);
spr.drawString("P-P: " + String(max_v - min_v) + "V", shift + 5, 5);
spr.drawString(frequency, shift + 5, 15);
//String offset_line = String((2.0 * v_div) / 1000.0 - offset) + "V";
String offset_line = String((3.0 * v_div) / 1000.0 - offset) + "V";
spr.drawString(offset_line, shift + 25, (DISPLAY_HEIGHT/2)-8);
if (set_value) {
uint16_t t_left = shift+161;
// Plus symbols while setting a value
spr.fillRect(t_left, 0, 11, 11, TFT_BLUE);
spr.drawRect(t_left, 0, 11, 11, TFT_WHITE);
spr.drawLine(t_left+2, 5, t_left+9, 5, TFT_WHITE);
spr.drawLine(t_left+5, 2, t_left+5, 8, TFT_WHITE);
// Minus symbols while setting a value
spr.fillRect(t_left, 124, 11, 11, TFT_BLUE);
spr.drawRect(t_left, 124, 11, 11, TFT_WHITE);
spr.drawLine(t_left+2, 129, t_left+9, 129, TFT_WHITE);
}
}
else if (info) {
spr.drawLine( 0, 120, DISPLAY_WIDTH, 120, TFT_WHITE); //center line
//spr.drawRect(shift + 10, 0, DISPLAY_WIDTH - shift - 20, 30, TFT_WHITE);
spr.drawString("P-P: " + String(max_v - min_v) + "V", shift + 15, 5);
spr.drawString(frequency, shift + 15, 15);
spr.drawString(String(int(v_div)) + "mV/div", shift - 100, 5);
spr.drawString(String(int(s_div)) + "uS/div", shift - 100, 15);
//String offset_line = String((2.0 * v_div) / 1000.0 - offset) + "V";
String offset_line = String((3.0 * v_div) / 1000.0 - offset) + "V";
spr.drawString(offset_line, shift + 75, (DISPLAY_HEIGHT/2)-8);
}
//push the drawed sprite to the screen
spr.pushSprite(0, 0);
yield(); // Stop watchdog reset
}
void draw_grid() {
for (int i = 0; i < (DISPLAY_WIDTH/10); i++) {
spr.drawPixel(i * 10, 40, TFT_WHITE);
spr.drawPixel(i * 10, 80, TFT_WHITE);
spr.drawPixel(i * 10, 120, TFT_WHITE);
spr.drawPixel(i * 10, 160, TFT_WHITE);
spr.drawPixel(i * 10, 200, TFT_WHITE);
}
for (int i = 0; i < DISPLAY_HEIGHT; i += 10) {
for (int j = 0; j < DISPLAY_WIDTH; j += 40) {
spr.drawPixel(j, i, TFT_WHITE);
}
}
}
void draw_channel1(uint32_t trigger0, uint32_t trigger1, uint16_t *i2s_buff, float sample_rate) {
//screen wave drawing
data[0] = to_scale(i2s_buff[trigger0]);
low_pass filter(0.99);
mean_filter mfilter(5);
mfilter.init(i2s_buff[trigger0]);
filter._value = i2s_buff[trigger0];
float data_per_pixel = (s_div / 40.0) / (sample_rate / 1000);
// uint32_t cursor = (trigger1-trigger0)/data_per_pixel;
// spr.drawLine(cursor, 0, cursor, 135, TFT_RED);
uint32_t index_offset = (uint32_t)(toffset / data_per_pixel);
trigger0 += index_offset;
uint32_t old_index = trigger0;
float n_data = 0, o_data = to_scale(i2s_buff[trigger0]);
for (uint32_t i = 1; i < DISPLAY_WIDTH; i++) {
uint32_t index = trigger0 + (uint32_t)((i + 1) * data_per_pixel);
if (index < BUFF_SIZE) {
if (full_pix && s_div > 40 && current_filter == 0) {
uint32_t max_val = i2s_buff[old_index];
uint32_t min_val = i2s_buff[old_index];
for (int j = old_index; j < index; j++) {
//draw lines for all this data points on pixel i
if (i2s_buff[j] > max_val)
max_val = i2s_buff[j];
else if (i2s_buff[j] < min_val)
min_val = i2s_buff[j];
}
spr.drawLine(i, to_scale(min_val), i, to_scale(max_val), TFT_BLUE);
}
else {
if (current_filter == 2)
n_data = to_scale(mfilter.filter((float)i2s_buff[index]));
else if (current_filter == 3)
n_data = to_scale(filter.filter((float)i2s_buff[index]));
else
n_data = to_scale(i2s_buff[index]);
spr.drawLine(i - 1, o_data, i, n_data, TFT_BLUE);
o_data = n_data;
}
}
else {
break;
}
old_index = index;
}
}