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add spi e-ink display

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This commit is contained in:
Adolfo Reyna
2025-11-26 12:29:21 -05:00
parent d07901835e
commit 7ad7e03a01
5 changed files with 164 additions and 48 deletions
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17
CMakeLists.txt
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@@ -39,12 +39,25 @@ if (TARGET tinyusb_device)
add_executable(hello_usb
hello_usb.cpp
display.cpp
commands/echo.cpp
)
add_subdirectory(pico-ssd1306)
add_subdirectory(pico-ssd1306 commands)
add_subdirectory(Pico_ePaper_Code/c/lib/Config)
add_subdirectory(Pico_ePaper_Code/c/lib/e-Paper)
add_subdirectory(Pico_ePaper_Code/c/lib/Fonts)
add_subdirectory(Pico_ePaper_Code/c/lib/GUI)
# Add include directories for e-Paper
target_include_directories(hello_usb PRIVATE
${CMAKE_CURRENT_SOURCE_DIR}/Pico_ePaper_Code/c/lib/Config
${CMAKE_CURRENT_SOURCE_DIR}/Pico_ePaper_Code/c/lib/e-Paper
${CMAKE_CURRENT_SOURCE_DIR}/Pico_ePaper_Code/c/lib/Fonts
${CMAKE_CURRENT_SOURCE_DIR}/Pico_ePaper_Code/c/lib/GUI
)
# pull in common dependencies
target_link_libraries(hello_usb pico_stdlib pico_ssd1306 hardware_i2c)
target_link_libraries(hello_usb pico_stdlib pico_ssd1306 hardware_i2c Config ePaper GUI Fonts hardware_spi)
# enable usb output, disable uart output
pico_enable_stdio_usb(hello_usb 1)

1
Pico_ePaper_Code Submodule

Submodule Pico_ePaper_Code added at c9bcd84db5

22
commands/echo.cpp Normal file
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@@ -0,0 +1,22 @@
#include <stdio.h>
#include <ctype.h>
#include <cstring>
#include "echo.h"
// Helper function to handle the echoing and resetting of the buffer
void echo_and_reset(char* buffer, int* index_ptr) {
if (*index_ptr > 0) {
buffer[*index_ptr] = '\0';
// Print to USB serial (ALL CAPS)
printf("\nEchoed (ALL CAPS): ");
for (int i = 0; buffer[i] != '\0'; i++) {
char ch = toupper(buffer[i]);
printf("%c", ch);
}
printf("\n");
}
*index_ptr = 0;
printf("> ");
}

14
commands/echo.h Normal file
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@@ -0,0 +1,14 @@
#ifndef COMMANDS_ECHO_H
#define COMMANDS_ECHO_H
#ifdef __cplusplus
extern "C" {
#endif
void echo_and_reset(char* buffer, int* index_ptr);
#ifdef __cplusplus
}
#endif
#endif // COMMANDS_ECHO_H

158
hello_usb.cpp
View File

@@ -1,6 +1,7 @@
/*
* Simple USB Serial Echo Program with Timeout, Reconnect, and Backspace Logic.
* Converted to C++ so the project can use the `pico-ssd1306` C++ library.
* Integrated with e-ink display support via Pico_ePaper library.
*/
#include "pico/stdlib.h"
@@ -8,12 +9,101 @@
#include <stdio.h>
#include <ctype.h>
#include <cstring>
#include <stdlib.h>
#include "display.h"
#include "commands/echo.h"
// e-Paper library includes
extern "C" {
#include "DEV_Config.h"
#include "EPD_7in5b_V2.h"
#include "GUI_Paint.h"
}
// Holds last echoed line for display
static char g_last_echo[128] = "";
// e-Paper display buffers
static UBYTE *g_epd_image = NULL; // Black image buffer
static UBYTE *g_epd_red = NULL; // Red image buffer
void init_epaper_display() {
printf("Initializing 7.5\" e-Paper display (B V2)...\r\n");
// Initialize the hardware
if (DEV_Module_Init() != 0) {
printf("Failed to initialize e-Paper hardware!\r\n");
return;
}
// Initialize the display
printf("EPD_7IN5B_V2_Init()\r\n");
EPD_7IN5B_V2_Init_Fast();
printf("EPD_7IN5B_V2_Clear()\r\n");
EPD_7IN5B_V2_ClearBlack();
DEV_Delay_ms(500);
// Create image buffers for black and red content
// 7.5" display: 800x480, 8 pixels per byte, so (800/8) * 480 = 48000 bytes each
UWORD imagesize = (EPD_7IN5B_V2_WIDTH / 8) * EPD_7IN5B_V2_HEIGHT;
g_epd_image = (UBYTE *)malloc(imagesize);
g_epd_red = (UBYTE *)malloc(imagesize);
if (g_epd_image == NULL || g_epd_red == NULL) {
printf("Failed to allocate memory for e-Paper image buffers!\r\n");
return;
}
// Initialize red buffer to all white (0xFF = no red pixels)
for (UWORD i = 0; i < imagesize; i++) {
g_epd_red[i] = 0xFF;
}
// Setup paint buffer for black content
printf("White background\r\n");
Paint_NewImage(g_epd_image, EPD_7IN5B_V2_WIDTH, EPD_7IN5B_V2_HEIGHT, 0, WHITE);
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);
// Display the image with both black and red buffers
printf("display text\r\n");
EPD_7IN5B_V2_Display(g_epd_image, g_epd_red);
printf("delay\r\n");
DEV_Delay_ms(2000);
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
@@ -21,55 +111,30 @@ static char g_last_echo[128] = "";
// ASCII code for Backspace (often sent as 0x08)
#define ASCII_BACKSPACE 8
// Helper function to handle the echoing and resetting of the buffer
void echo_and_reset(char* buffer, int* index_ptr, DisplayManager &display) {
if (*index_ptr > 0) {
buffer[*index_ptr] = '\0';
// Print to USB serial (ALL CAPS)
printf("\nEchoed (ALL CAPS): ");
for (int i = 0; buffer[i] != '\0'; i++) {
char ch = toupper(buffer[i]);
printf("%c", ch);
}
printf("\n");
// Save last echoed (all caps) for display
size_t i = 0;
for (; buffer[i] != '\0' && i < sizeof(g_last_echo) - 1; ++i) {
g_last_echo[i] = (char)toupper(buffer[i]);
}
g_last_echo[i] = '\0';
}
*index_ptr = 0;
printf("> ");
// Update OLED to show cleared input and last echo
display.set_last_echo(g_last_echo);
display.refresh("", g_last_echo);
}
void wait_for_usb_connection() {
void wait_for_usb_connection(DisplayManager &display) {
printf("Waiting for USB host to connect...\n");
while (!stdio_usb_connected()) {
sleep_ms(100);
}
printf("\nConnection Established! Starting Echo Session...\n");
display.refresh(">", nullptr);
// Initialize e-Paper display
init_epaper_display();
}
void run_echo_session(DisplayManager &display) {
char input_buffer[MAX_INPUT_LEN];
int buffer_index = 0;
uint64_t last_char_time = time_us_64();
printf("--- Pico USB String Echo Program Started ---\n");
printf("Type a sentence (up to %d chars). It will echo on Enter/Timeout.\n", MAX_INPUT_LEN - 2);
printf("--- Welcome User! ---\n");
printf("Type a command (or write help):\n");
printf("--------------------------------------------\n");
printf("> ");
while (stdio_usb_connected()) {
int c = getchar_timeout_us(0);
if (c != PICO_ERROR_TIMEOUT) {
last_char_time = time_us_64();
char input_char = (char)c;
if (input_char == ASCII_BACKSPACE || input_char == 127) {
if (buffer_index > 0) {
@@ -80,8 +145,16 @@ void run_echo_session(DisplayManager &display) {
display.refresh(input_buffer, g_last_echo);
}
} else if (input_char == '\r' || input_char == '\n') {
echo_and_reset(input_buffer, &buffer_index, display);
// after echo_and_reset the display is refreshed inside it
echo_and_reset(input_buffer, &buffer_index);
// Save last echoed (all caps) for display
size_t i = 0;
for (; input_buffer[i] != '\0' && i < sizeof(g_last_echo) - 1; ++i) {
g_last_echo[i] = input_buffer[i];
}
g_last_echo[i] = '\0';
// Update OLED to show cleared input and last echo
display.set_last_echo(g_last_echo);
display.refresh("", g_last_echo);
} else if (buffer_index < (MAX_INPUT_LEN - 1) && isprint(input_char)) {
printf("%c", input_char);
input_buffer[buffer_index] = input_char;
@@ -91,29 +164,22 @@ void run_echo_session(DisplayManager &display) {
display.refresh(input_buffer, g_last_echo);
}
}
if (buffer_index > 0 && (time_us_64() - last_char_time) > TIMEOUT_US) {
printf("\n--- Timeout Reached (5.0s silence) ---\n");
echo_and_reset(input_buffer, &buffer_index, display);
last_char_time = time_us_64();
}
// Advance marquee for last echoed text if needed
size_t last_len = strlen(g_last_echo);
uint64_t now_ms = time_us_64() / 1000;
sleep_us(100);
}
printf("\nHost disconnected. Ending Echo Session.\n");
}
int main() {
stdio_init_all();
DisplayManager display;
display.init();
display.refresh("Waiting for USB/Serial", nullptr);
while (true) {
wait_for_usb_connection();
wait_for_usb_connection(display);
run_echo_session(display);
}