I have some projects that use the a SSD1306 oled display driven via i2c. These all used to work. One of these projects is a simple port of the Adafruit SSD1306 test program I will use this as an example.
Here is the platformio.ini for that project.
[env]
build_flags = -std=gnu++17
lib_deps = adafruit/Adafruit SSD1306@^2.5.7
adafruit/Adafruit BusIO@1.15.0
[env:nucleo_f103rb]
platform = ststm32
board = nucleo_f103rb
framework = arduino
monitor_port = /dev/ttyACM0
[env:teensy41]
platform = teensy
board = teensy41
framework = arduino
The ststm32 platform build works fine. The teensy platform build produces compiles and uploads but has no output on the i2c SDA or SCL pads. An Arduino IDE build of the same code works perfectly.
Here is the sketch code main.cpp
#include <Arduino.h>
/**************************************************************************
This is an example for our Monochrome OLEDs based on SSD1306 drivers
Pick one up today in the adafruit shop!
------> http://www.adafruit.com/category/63_98
This example is for a 128x64 pixel display using I2C to communicate
3 pins are required to interface (two I2C and one reset).
Adafruit invests time and resources providing this open
source code, please support Adafruit and open-source
hardware by purchasing products from Adafruit!
Written by Limor Fried/Ladyada for Adafruit Industries,
with contributions from the open source community.
BSD license, check license.txt for more information
All text above, and the splash screen below must be
included in any redistribution.
**************************************************************************/
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
// The pins for I2C are defined by the Wire-library.
// On an arduino UNO: A4(SDA), A5(SCL)
// On an arduino MEGA 2560: 20(SDA), 21(SCL)
// On an arduino LEONARDO: 2(SDA), 3(SCL), ...
#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3C ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
#define NUMFLAKES 10 // Number of snowflakes in the animation example
#define LOGO_HEIGHT 16
#define LOGO_WIDTH 16
static const unsigned char PROGMEM logo_bmp[] =
{0b00000000, 0b11000000,
0b00000001, 0b11000000,
0b00000001, 0b11000000,
0b00000011, 0b11100000,
0b11110011, 0b11100000,
0b11111110, 0b11111000,
0b01111110, 0b11111111,
0b00110011, 0b10011111,
0b00011111, 0b11111100,
0b00001101, 0b01110000,
0b00011011, 0b10100000,
0b00111111, 0b11100000,
0b00111111, 0b11110000,
0b01111100, 0b11110000,
0b01110000, 0b01110000,
0b00000000, 0b00110000};
void testdrawline()
{
int16_t i;
display.clearDisplay(); // Clear display buffer
for (i = 0; i < display.width(); i += 4)
{
display.drawLine(0, 0, i, display.height() - 1, SSD1306_WHITE);
display.display(); // Update screen with each newly-drawn line
delay(1);
}
for (i = 0; i < display.height(); i += 4)
{
display.drawLine(0, 0, display.width() - 1, i, SSD1306_WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for (i = 0; i < display.width(); i += 4)
{
display.drawLine(0, display.height() - 1, i, 0, SSD1306_WHITE);
display.display();
delay(1);
}
for (i = display.height() - 1; i >= 0; i -= 4)
{
display.drawLine(0, display.height() - 1, display.width() - 1, i, SSD1306_WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for (i = display.width() - 1; i >= 0; i -= 4)
{
display.drawLine(display.width() - 1, display.height() - 1, i, 0, SSD1306_WHITE);
display.display();
delay(1);
}
for (i = display.height() - 1; i >= 0; i -= 4)
{
display.drawLine(display.width() - 1, display.height() - 1, 0, i, SSD1306_WHITE);
display.display();
delay(1);
}
delay(250);
display.clearDisplay();
for (i = 0; i < display.height(); i += 4)
{
display.drawLine(display.width() - 1, 0, 0, i, SSD1306_WHITE);
display.display();
delay(1);
}
for (i = 0; i < display.width(); i += 4)
{
display.drawLine(display.width() - 1, 0, i, display.height() - 1, SSD1306_WHITE);
display.display();
delay(1);
}
delay(2000); // Pause for 2 seconds
}
void testdrawrect(void)
{
display.clearDisplay();
for (int16_t i = 0; i < display.height() / 2; i += 2)
{
display.drawRect(i, i, display.width() - 2 * i, display.height() - 2 * i, SSD1306_WHITE);
display.display(); // Update screen with each newly-drawn rectangle
delay(1);
}
delay(2000);
}
void testfillrect(void)
{
display.clearDisplay();
for (int16_t i = 0; i < display.height() / 2; i += 3)
{
// The INVERSE color is used so rectangles alternate white/black
display.fillRect(i, i, display.width() - i * 2, display.height() - i * 2, SSD1306_INVERSE);
display.display(); // Update screen with each newly-drawn rectangle
delay(1);
}
delay(2000);
}
void testdrawcircle(void)
{
display.clearDisplay();
for (int16_t i = 0; i < max(display.width(), display.height()) / 2; i += 2)
{
display.drawCircle(display.width() / 2, display.height() / 2, i, SSD1306_WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfillcircle(void)
{
display.clearDisplay();
for (int16_t i = max(display.width(), display.height()) / 2; i > 0; i -= 3)
{
// The INVERSE color is used so circles alternate white/black
display.fillCircle(display.width() / 2, display.height() / 2, i, SSD1306_INVERSE);
display.display(); // Update screen with each newly-drawn circle
delay(1);
}
delay(2000);
}
void testdrawroundrect(void)
{
display.clearDisplay();
for (int16_t i = 0; i < display.height() / 2 - 2; i += 2)
{
display.drawRoundRect(i, i, display.width() - 2 * i, display.height() - 2 * i,
display.height() / 4, SSD1306_WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfillroundrect(void)
{
display.clearDisplay();
for (int16_t i = 0; i < display.height() / 2 - 2; i += 2)
{
// The INVERSE color is used so round-rects alternate white/black
display.fillRoundRect(i, i, display.width() - 2 * i, display.height() - 2 * i,
display.height() / 4, SSD1306_INVERSE);
display.display();
delay(1);
}
delay(2000);
}
void testdrawtriangle(void)
{
display.clearDisplay();
for (int16_t i = 0; i < max(display.width(), display.height()) / 2; i += 5)
{
display.drawTriangle(
display.width() / 2, display.height() / 2 - i,
display.width() / 2 - i, display.height() / 2 + i,
display.width() / 2 + i, display.height() / 2 + i, SSD1306_WHITE);
display.display();
delay(1);
}
delay(2000);
}
void testfilltriangle(void)
{
display.clearDisplay();
for (int16_t i = max(display.width(), display.height()) / 2; i > 0; i -= 5)
{
// The INVERSE color is used so triangles alternate white/black
display.fillTriangle(
display.width() / 2, display.height() / 2 - i,
display.width() / 2 - i, display.height() / 2 + i,
display.width() / 2 + i, display.height() / 2 + i, SSD1306_INVERSE);
display.display();
delay(1);
}
delay(2000);
}
void testdrawchar(void)
{
display.clearDisplay();
display.setTextSize(1); // Normal 1:1 pixel scale
display.setTextColor(SSD1306_WHITE); // Draw white text
display.setCursor(0, 0); // Start at top-left corner
display.cp437(true); // Use full 256 char 'Code Page 437' font
// Not all the characters will fit on the display. This is normal.
// Library will draw what it can and the rest will be clipped.
for (int16_t i = 0; i < 256; i++)
{
if (i == '\n')
display.write(' ');
else
display.write(i);
}
display.display();
delay(2000);
}
void testdrawstyles(void)
{
display.clearDisplay();
display.setTextSize(1); // Normal 1:1 pixel scale
display.setTextColor(SSD1306_WHITE); // Draw white text
display.setCursor(0, 0); // Start at top-left corner
display.println(F("Hello, world!"));
display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text
display.println(3.141592);
display.setTextSize(2); // Draw 2X-scale text
display.setTextColor(SSD1306_WHITE);
display.print(F("0x"));
display.println(0xDEADBEEF, HEX);
display.display();
delay(2000);
}
void testscrolltext(void)
{
display.clearDisplay();
display.setTextSize(2); // Draw 2X-scale text
display.setTextColor(SSD1306_WHITE);
display.setCursor(10, 0);
display.println(F("scroll"));
display.display(); // Show initial text
delay(100);
// Scroll in various directions, pausing in-between:
display.startscrollright(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrollleft(0x00, 0x0F);
delay(2000);
display.stopscroll();
delay(1000);
display.startscrolldiagright(0x00, 0x07);
delay(2000);
display.startscrolldiagleft(0x00, 0x07);
delay(2000);
display.stopscroll();
delay(1000);
}
void testdrawbitmap(void)
{
display.clearDisplay();
display.drawBitmap(
(display.width() - LOGO_WIDTH) / 2,
(display.height() - LOGO_HEIGHT) / 2,
logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
display.display();
delay(1000);
}
#define XPOS 0 // Indexes into the 'icons' array in function below
#define YPOS 1
#define DELTAY 2
void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h)
{
int8_t f, icons[NUMFLAKES][3];
// Initialize 'snowflake' positions
for (f = 0; f < NUMFLAKES; f++)
{
icons[f][XPOS] = random(1 - LOGO_WIDTH, display.width());
icons[f][YPOS] = -LOGO_HEIGHT;
icons[f][DELTAY] = random(1, 6);
Serial.print(F("x: "));
Serial.print(icons[f][XPOS], DEC);
Serial.print(F(" y: "));
Serial.print(icons[f][YPOS], DEC);
Serial.print(F(" dy: "));
Serial.println(icons[f][DELTAY], DEC);
}
for (;;)
{ // Loop forever...
display.clearDisplay(); // Clear the display buffer
// Draw each snowflake:
for (f = 0; f < NUMFLAKES; f++)
{
display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, SSD1306_WHITE);
}
display.display(); // Show the display buffer on the screen
delay(200); // Pause for 1/10 second
// Then update coordinates of each flake...
for (f = 0; f < NUMFLAKES; f++)
{
icons[f][YPOS] += icons[f][DELTAY];
// If snowflake is off the bottom of the screen...
if (icons[f][YPOS] >= display.height())
{
// Reinitialize to a random position, just off the top
icons[f][XPOS] = random(1 - LOGO_WIDTH, display.width());
icons[f][YPOS] = -LOGO_HEIGHT;
icons[f][DELTAY] = random(1, 6);
}
}
}
}
void setup()
{
// Setup monitor
Serial.begin(9600);
Serial.printf("Serial is ready\n");
// SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS))
{
Serial.println(F("SSD1306 allocation failed"));
for (;;)
; // Don't proceed, loop forever
}
// Show initial display buffer contents on the screen --
// the library initializes this with an Adafruit splash screen.
Serial.printf("About to show logo\n");
Serial.flush();
display.display();
Serial.printf("Displaying logo\n");
Serial.flush();
delay(2000); // Pause for 2 seconds
// Clear the buffer
display.clearDisplay();
// Draw a single pixel in white
display.drawPixel(10, 10, SSD1306_WHITE);
// Show the display buffer on the screen. You MUST call display() after
// drawing commands to make them visible on screen!
display.display();
delay(2000);
// display.display() is NOT necessary after every single drawing command,
// unless that's what you want...rather, you can batch up a bunch of
// drawing operations and then update the screen all at once by calling
// display.display(). These examples demonstrate both approaches...
testdrawline(); // Draw many lines
testdrawrect(); // Draw rectangles (outlines)
testfillrect(); // Draw rectangles (filled)
testdrawcircle(); // Draw circles (outlines)
testfillcircle(); // Draw circles (filled)
testdrawroundrect(); // Draw rounded rectangles (outlines)
testfillroundrect(); // Draw rounded rectangles (filled)
testdrawtriangle(); // Draw triangles (outlines)
testfilltriangle(); // Draw triangles (filled)
testdrawchar(); // Draw characters of the default font
testdrawstyles(); // Draw 'stylized' characters
testscrolltext(); // Draw scrolling text
testdrawbitmap(); // Draw a small bitmap image
// Invert and restore display, pausing in-between
display.invertDisplay(true);
delay(1000);
display.invertDisplay(false);
delay(1000);
testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps
}
void loop()
{
}
I have more info if required but it exceeds the post limit. I will put put it into a second post.
But the summary is Arduino build works, ststm32 build works, teensy41 build does not work.
Anyone got any ideas on how to proceed on this?
