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partial refresh with multiple lines

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This commit is contained in:
Adolfo Reyna
2025-11-26 13:25:41 -05:00
parent 88732d666a
commit 961b4c069b
1 changed files with 90 additions and 51 deletions
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141
hello_usb.cpp
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@@ -29,13 +29,26 @@ static char g_last_echo[128] = "";
static UBYTE *g_epd_image = NULL; // Black image buffer
static UBYTE *g_epd_red = NULL; // Red image buffer
// Entry list for display
#define MAX_ENTRIES 10
#define ENTRY_LENGTH 64
typedef struct {
char entries[MAX_ENTRIES][ENTRY_LENGTH];
int count;
} EntryList;
static EntryList g_entry_list = {{}, 0};
// Synchronization flag for multicore initialization
static volatile bool g_display_ready = false;
// Display update message structure for inter-core communication
typedef struct {
char line1[64];
char line2[64];
EntryList entries;
bool use_partial; // Use partial refresh instead of full refresh
UWORD xstart; // Partial refresh region
UWORD ystart;
UWORD xend;
UWORD yend;
} DisplayMessage;
void init_epaper_display() {
@@ -77,43 +90,20 @@ void init_epaper_display() {
Paint_SelectImage(g_epd_image);
Paint_Clear(WHITE);
// Draw "Hello World" on the display
printf("Drawing\r\n");
Paint_DrawString_EN(10, 10, "Hello World!", &Font24, WHITE, BLACK);
Paint_DrawString_EN(10, 60, "7.5\" e-Paper Initialized", &Font16, WHITE, BLACK);
// Draw header
// printf("Drawing header\r\n");
// Paint_DrawString_EN(10, 10, "What's new today:", &Font24, BLACK, WHITE);
// Display the image with both black and red buffers
printf("display text\r\n");
// printf("display text\r\n");
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
printf("delay\r\n");
DEV_Delay_ms(2000);
// printf("delay\r\n");
// DEV_Delay_ms(1000);
printf("e-Paper display ready!\r\n");
// EPD_7IN5B_V2_Sleep();
}
void update_epaper_display(const char *line1, const char *line2) {
if (g_epd_image == NULL || g_epd_red == NULL) return;
// Clear and prepare buffers
UWORD imagesize = (EPD_7IN5B_V2_WIDTH / 8) * EPD_7IN5B_V2_HEIGHT;
for (UWORD i = 0; i < imagesize; i++) {
g_epd_red[i] = 0xFF; // No red pixels
}
Paint_SelectImage(g_epd_image);
Paint_Clear(WHITE);
if (line1) {
Paint_DrawString_EN(50, 100, (char *)line1, &Font16, BLACK, WHITE);
}
if (line2) {
Paint_DrawString_EN(50, 150, (char *)line2, &Font16, BLACK, WHITE);
}
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
}
// Define the maximum size for the input string buffer
#define MAX_INPUT_LEN 64
// Define the timeout period: 5 seconds in microseconds
@@ -122,11 +112,25 @@ void update_epaper_display(const char *line1, const char *line2) {
#define ASCII_BACKSPACE 8
/**
* Send a display update message to core 1 via FIFO
* Add an entry to the display list and send update to core 1
*/
void send_display_update(const char *line1, const char *line2) {
void send_display_update(const char *entry) {
if (!g_display_ready) return; // Don't send if display isn't ready
// Add entry to global list
if (g_entry_list.count < MAX_ENTRIES) {
strncpy(g_entry_list.entries[g_entry_list.count], entry, ENTRY_LENGTH - 1);
g_entry_list.entries[g_entry_list.count][ENTRY_LENGTH - 1] = '\0';
g_entry_list.count++;
} else {
// Shift entries up and add new one at bottom
for (int i = 0; i < MAX_ENTRIES - 1; i++) {
strcpy(g_entry_list.entries[i], g_entry_list.entries[i + 1]);
}
strncpy(g_entry_list.entries[MAX_ENTRIES - 1], entry, ENTRY_LENGTH - 1);
g_entry_list.entries[MAX_ENTRIES - 1][ENTRY_LENGTH - 1] = '\0';
}
// Allocate message structure
DisplayMessage *msg = (DisplayMessage *)malloc(sizeof(DisplayMessage));
if (msg == NULL) {
@@ -134,18 +138,21 @@ void send_display_update(const char *line1, const char *line2) {
return;
}
// Copy strings into message
strncpy(msg->line1, line1 ? line1 : "", sizeof(msg->line1) - 1);
msg->line1[sizeof(msg->line1) - 1] = '\0';
// Copy entry list to message
msg->entries = g_entry_list;
strncpy(msg->line2, line2 ? line2 : "", sizeof(msg->line2) - 1);
msg->line2[sizeof(msg->line2) - 1] = '\0';
// Setup partial refresh region (text area at top of display)
msg->use_partial = true;
msg->xstart = 0;
msg->ystart = 50; // Start below the header
msg->xend = 800; // Full width
msg->yend = 480; // Full height from header onwards
// Send message pointer to core 1
multicore_fifo_push_blocking((uint32_t)msg);
// Wait for core 1 to complete the update
// multicore_fifo_pop_blocking();
multicore_fifo_pop_blocking();
}
/**
@@ -157,6 +164,9 @@ void core1_display_init() {
printf("[Core 1] Display ready, waiting for update messages...\n");
// Initialize for partial refresh on second call
EPD_7IN5B_V2_Init_Part();
// Core 1 main loop: handle display updates via FIFO
while (true) {
// Check if there's a message from core 0
@@ -165,26 +175,55 @@ void core1_display_init() {
uint32_t msg_addr = multicore_fifo_pop_blocking();
DisplayMessage *msg = (DisplayMessage *)msg_addr;
printf("[Core 1] Updating display: '%s' / '%s'\n", msg->line1, msg->line2);
printf("[Core 1] Updating display with %d entries\n", msg->entries.count);
// Update the e-Paper display
if (g_epd_image != NULL && g_epd_red != NULL) {
UWORD imagesize = (EPD_7IN5B_V2_WIDTH / 8) * EPD_7IN5B_V2_HEIGHT;
for (UWORD i = 0; i < imagesize; i++) {
g_epd_red[i] = 0xFF;
// For partial refresh, only clear the text area
UWORD width = (EPD_7IN5B_V2_WIDTH / 8);
UWORD y_start = msg->ystart;
UWORD y_end = msg->yend;
if (msg->use_partial) {
// Clear only the affected region in the buffers
for (UWORD y = y_start; y < y_end; y++) {
for (UWORD x = 0; x < width; x++) {
g_epd_image[x + y * width] = 0xFF; // White
g_epd_red[x + y * width] = 0xFF; // No red
}
}
} else {
// Full clear
for (UWORD i = 0; i < imagesize; i++) {
g_epd_image[i] = 0xFF;
g_epd_red[i] = 0xFF;
}
}
// Paint_SelectImage(g_epd_image);
// Paint_Clear(WHITE);
Paint_SelectImage(g_epd_image);
if (msg->line1[0] != '\0') {
Paint_DrawString_EN(50, 100, msg->line1, &Font16, BLACK, WHITE);
}
if (msg->line2[0] != '\0') {
Paint_DrawString_EN(50, 150, msg->line2, &Font16, BLACK, WHITE);
// Draw header
Paint_DrawString_EN(10, 10, "What's new today:", &Font24, WHITE, BLACK);
// Draw all entries starting below header
UWORD y_pos = 50;
for (int i = 0; i < msg->entries.count; i++) {
if (y_pos + 20 < 480) { // Don't draw beyond screen
Paint_DrawString_EN(20, y_pos, msg->entries.entries[i], &Font16, WHITE, BLACK);
y_pos += 25; // Space between entries
}
}
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
// Use partial or full refresh
if (msg->use_partial) {
printf("[Core 1] Using partial refresh\n");
EPD_7IN5B_V2_Display_Partial(g_epd_image, msg->xstart, msg->ystart, msg->xend, msg->yend);
} else {
printf("[Core 1] Using full refresh\n");
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
}
}
// Free the message (it was allocated by core 0)
@@ -240,7 +279,7 @@ void run_echo_session(DisplayManager &display) {
// Update both displays to show cleared input and last echo
display.set_last_echo(g_last_echo);
display.refresh("", g_last_echo);
send_display_update("", g_last_echo);
send_display_update(g_last_echo);
} else if (buffer_index < (MAX_INPUT_LEN - 1) && isprint(input_char)) {
printf("%c", input_char);
input_buffer[buffer_index] = input_char;