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2-ink display init and draws on second core

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This commit is contained in:
Adolfo Reyna
2025-11-26 13:03:43 -05:00
parent 7ad7e03a01
commit 88732d666a
2 changed files with 97 additions and 8 deletions
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2
CMakeLists.txt
View File

@@ -57,7 +57,7 @@ if (TARGET tinyusb_device)
)
# pull in common dependencies
target_link_libraries(hello_usb pico_stdlib pico_ssd1306 hardware_i2c Config ePaper GUI Fonts hardware_spi)
target_link_libraries(hello_usb pico_stdlib pico_ssd1306 hardware_i2c Config ePaper GUI Fonts hardware_spi pico_multicore)
# enable usb output, disable uart output
pico_enable_stdio_usb(hello_usb 1)

103
hello_usb.cpp
View File

@@ -6,6 +6,7 @@
#include "pico/stdlib.h"
#include "pico/time.h" // Needed for time_us_64()
#include "pico/multicore.h"
#include <stdio.h>
#include <ctype.h>
#include <cstring>
@@ -28,6 +29,15 @@ static char g_last_echo[128] = "";
static UBYTE *g_epd_image = NULL; // Black image buffer
static UBYTE *g_epd_red = NULL; // Red image buffer
// 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];
} DisplayMessage;
void init_epaper_display() {
printf("Initializing 7.5\" e-Paper display (B V2)...\r\n");
@@ -111,6 +121,83 @@ void update_epaper_display(const char *line1, const char *line2) {
// ASCII code for Backspace (often sent as 0x08)
#define ASCII_BACKSPACE 8
/**
* Send a display update message to core 1 via FIFO
*/
void send_display_update(const char *line1, const char *line2) {
if (!g_display_ready) return; // Don't send if display isn't ready
// Allocate message structure
DisplayMessage *msg = (DisplayMessage *)malloc(sizeof(DisplayMessage));
if (msg == NULL) {
printf("Failed to allocate display message!\n");
return;
}
// Copy strings into message
strncpy(msg->line1, line1 ? line1 : "", sizeof(msg->line1) - 1);
msg->line1[sizeof(msg->line1) - 1] = '\0';
strncpy(msg->line2, line2 ? line2 : "", sizeof(msg->line2) - 1);
msg->line2[sizeof(msg->line2) - 1] = '\0';
// 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();
}
/**
* Core 1 function: Runs display initialization and update handling
*/
void core1_display_init() {
init_epaper_display();
g_display_ready = true;
printf("[Core 1] Display ready, waiting for update messages...\n");
// Core 1 main loop: handle display updates via FIFO
while (true) {
// Check if there's a message from core 0
if (multicore_fifo_rvalid()) {
// Read the message pointer
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);
// 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;
}
// Paint_SelectImage(g_epd_image);
// Paint_Clear(WHITE);
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);
}
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
}
// Free the message (it was allocated by core 0)
free(msg);
// Signal back to core 0 that update is complete
multicore_fifo_push_blocking(1);
}
sleep_ms(10);
}
}
void wait_for_usb_connection(DisplayManager &display) {
printf("Waiting for USB host to connect...\n");
while (!stdio_usb_connected()) {
@@ -118,9 +205,6 @@ void wait_for_usb_connection(DisplayManager &display) {
}
printf("\nConnection Established! Starting Echo Session...\n");
display.refresh(">", nullptr);
// Initialize e-Paper display
init_epaper_display();
}
void run_echo_session(DisplayManager &display) {
@@ -140,9 +224,10 @@ void run_echo_session(DisplayManager &display) {
if (buffer_index > 0) {
buffer_index--;
printf("\b \b");
// update display to reflect removed char
// update displays to reflect removed char
input_buffer[buffer_index] = '\0';
display.refresh(input_buffer, g_last_echo);
// send_display_update(input_buffer, g_last_echo);
}
} else if (input_char == '\r' || input_char == '\n') {
echo_and_reset(input_buffer, &buffer_index);
@@ -152,16 +237,18 @@ void run_echo_session(DisplayManager &display) {
g_last_echo[i] = input_buffer[i];
}
g_last_echo[i] = '\0';
// Update OLED to show cleared input and last echo
// 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);
} else if (buffer_index < (MAX_INPUT_LEN - 1) && isprint(input_char)) {
printf("%c", input_char);
input_buffer[buffer_index] = input_char;
buffer_index++;
// update OLED with current input
// update both displays with current input
input_buffer[buffer_index] = '\0';
display.refresh(input_buffer, g_last_echo);
// send_display_update(input_buffer, g_last_echo);
}
}
sleep_us(100);
@@ -172,7 +259,9 @@ void run_echo_session(DisplayManager &display) {
int main() {
stdio_init_all();
// Launch display initialization on core 1
printf("Launching e-Paper display init on core 1...\n");
multicore_launch_core1(core1_display_init);
DisplayManager display;
display.init();