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display.c
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#include "display.h"
#include <stdio.h>
#include <string.h>
static unsigned long frame_counter = 0;
static char display_buffer[4096]; // Adjust size as needed
// Helper function to write to our buffer instead of directly to stdout
static void buffer_printf(char *buffer, size_t *offset, const char *format, ...) {
va_list args;
va_start(args, format);
*offset += vsprintf(buffer + *offset, format, args);
va_end(args);
}
void display_joystick_info(Joystick *left, Joystick *right) {
size_t offset = 0;
// Clear buffer
memset(display_buffer, 0, sizeof(display_buffer));
buffer_printf(display_buffer, &offset, "%-40s %s\n", "Left Stick Axes:", "Right Stick Axes:");
buffer_printf(display_buffer, &offset, "%-40s %s\n", left->name, right->name);
int max_axes = (left->axis_count > right->axis_count) ?
left->axis_count : right->axis_count;
for (int i = 0; i < max_axes; i++) {
// Left stick axis
if (i < left->axis_count) {
buffer_printf(display_buffer, &offset, "Axis %d: %6d ", i, left->axes[i]);
buffer_printf(display_buffer, &offset, "[");
int center = 10;
int pos = (left->axes[i] + 32768) * 20 / 65535;
for (int j = 0; j < 20; j++) {
if (pos > center && j >= center && j <= pos) {
buffer_printf(display_buffer, &offset, "█");
} else if (pos < center && j <= center && j >= pos) {
buffer_printf(display_buffer, &offset, "█");
} else if (j == center) {
buffer_printf(display_buffer, &offset, "|");
} else {
buffer_printf(display_buffer, &offset, " ");
}
}
buffer_printf(display_buffer, &offset, "]");
} else {
buffer_printf(display_buffer, &offset, "%40s", "");
}
buffer_printf(display_buffer, &offset, " ");
// Right stick axis
if (i < right->axis_count) {
buffer_printf(display_buffer, &offset, "Axis %d: %6d ", i, right->axes[i]);
buffer_printf(display_buffer, &offset, "[");
int center = 10;
int pos = (right->axes[i] + 32768) * 20 / 65535;
for (int j = 0; j < 20; j++) {
if (pos > center && j >= center && j <= pos) {
buffer_printf(display_buffer, &offset, "█");
} else if (pos < center && j <= center && j >= pos) {
buffer_printf(display_buffer, &offset, "█");
} else if (j == center) {
buffer_printf(display_buffer, &offset, "|");
} else {
buffer_printf(display_buffer, &offset, " ");
}
}
buffer_printf(display_buffer, &offset, "]");
}
buffer_printf(display_buffer, &offset, "\n");
}
// Display buttons
buffer_printf(display_buffer, &offset, "\nLeft Stick Buttons (%d):\n", left->button_count);
for (int i = 0; i < left->button_count && left->buttons != NULL; i++) {
if (i > 0 && i % 16 == 0) buffer_printf(display_buffer, &offset, "\n");
left->buttons[i] ? buffer_printf(display_buffer, &offset, "🟩 ") :
buffer_printf(display_buffer, &offset, "⬛ ");
}
buffer_printf(display_buffer, &offset, "\n\nRight Stick Buttons (%d):\n", right->button_count);
for (int i = 0; i < right->button_count && right->buttons != NULL; i++) {
if (i > 0 && i % 16 == 0) buffer_printf(display_buffer, &offset, "\n");
right->buttons[i] ? buffer_printf(display_buffer, &offset, "🟩 ") :
buffer_printf(display_buffer, &offset, "⬛ ");
}
buffer_printf(display_buffer, &offset, "\n");
// Write the entire buffer at once
printf("%s", display_buffer);
}
void display_crsf_info(uint16_t *channels, CRSF_Frame *frame) {
size_t offset = 0;
memset(display_buffer, 0, sizeof(display_buffer));
buffer_printf(display_buffer, &offset, "\n\nCRSF Channels:");
buffer_printf(display_buffer, &offset, " ╔════════════ CRSF Frame ════════════╗\n");
for (int i = 0; i < CRSF_NUM_CHANNELS/2; i++) {
// Left column (channels 1-8)
buffer_printf(display_buffer, &offset, "CH%2d: %4d ", i + 1, channels[i]);
int pos = (channels[i] - CRSF_CHANNEL_VALUE_MIN) * 20 /
(CRSF_CHANNEL_VALUE_MAX - CRSF_CHANNEL_VALUE_MIN);
buffer_printf(display_buffer, &offset, "[");
for (int j = 0; j < 20; j++) {
if (j <= pos) buffer_printf(display_buffer, &offset, "█");
else buffer_printf(display_buffer, &offset, " ");
}
buffer_printf(display_buffer, &offset, "] ");
// Right column (channels 9-16)
int right_ch = i + CRSF_NUM_CHANNELS/2;
buffer_printf(display_buffer, &offset, "CH%2d: %4d ", right_ch + 1, channels[right_ch]);
pos = (channels[right_ch] - CRSF_CHANNEL_VALUE_MIN) * 20 /
(CRSF_CHANNEL_VALUE_MAX - CRSF_CHANNEL_VALUE_MIN);
buffer_printf(display_buffer, &offset, "[");
for (int j = 0; j < 20; j++) {
if (j <= pos) buffer_printf(display_buffer, &offset, "█");
else buffer_printf(display_buffer, &offset, " ");
}
buffer_printf(display_buffer, &offset, "] ");
switch(i) {
case 0:
buffer_printf(display_buffer, &offset, "║ Addr: C8 Size: 1A Type: 16 ║");
break;
case 1:
buffer_printf(display_buffer, &offset, "║ Payload: ║");
break;
case 2:
buffer_printf(display_buffer, &offset, "║ %02X %02X %02X %02X %02X %02X %02X %02X ║",
frame->payload[0], frame->payload[1], frame->payload[2],
frame->payload[3], frame->payload[4], frame->payload[5],
frame->payload[6], frame->payload[7]);
break;
case 3:
buffer_printf(display_buffer, &offset, "║ %02X %02X %02X %02X %02X %02X %02X %02X ║",
frame->payload[8], frame->payload[9], frame->payload[10],
frame->payload[11], frame->payload[12], frame->payload[13],
frame->payload[14], frame->payload[15]);
break;
case 4:
buffer_printf(display_buffer, &offset, "║ %02X %02X %02X %02X %02X %02X %02X %02X ║",
frame->payload[16], frame->payload[17], frame->payload[18],
frame->payload[19], frame->payload[20], frame->payload[21],
frame->payload[22], frame->payload[23]);
break;
case 5:
buffer_printf(display_buffer, &offset, "║ CRC: %02X ║", frame->crc);
break;
case 6:
buffer_printf(display_buffer, &offset, "║ ║");
break;
case 7:
buffer_printf(display_buffer, &offset, "╚════════════════════════════════════╝");
break;
}
buffer_printf(display_buffer, &offset, "\n");
}
printf("%s", display_buffer);
}
void display_full_debug(Joystick *left, Joystick *right, uint16_t *channels, CRSF_Frame *frame) {
frame_counter++;
// Save cursor and move to home
printf("\033[H\033[J");
// Draw output
printf("Frame: %lu\n\n", frame_counter);
display_joystick_info(left, right);
display_crsf_info(channels, frame);
// make sure output is displayed
fflush(stdout);
}