Huzzah!
I can confirm that OLED on the XIAO expansion board works with an XIAO RP2040 using version 2.7.2 of the board package.
Here’s my basic test using the U8g2 library (Same as first attachment)
/*
XIAO RP2040 test of OLED on the Seeeduino SIAO Expansion board
Patterned after the u8g2 library HelloWorld example
This works with Seeed XIAO RP2040 board package 2.7.2
Note the board type in the u8x8 constructor below.
davekw7x
April, 2022
*/
#include <U8g2lib.h> // In U8g2 library
// Seeed Expansion board uses SSD1306
U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset= */ U8X8_PIN_NONE);
// My breadboard has an SH1106
//U8G2_SH1106_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
void setup(void) {
// Change #if 0 to #if 1 to print some stuff
// If you do, it will wait until you open the Serial Monitor
#if 0
Serial.begin(115200);
while (!Serial) {}
delay(100);
Serial.println("\nOLED u8g2lib test compiled on " __DATE__ " at " __TIME__);
#endif
u8g2.begin();
}
char printBuffer[30];
uint8_t passno;
void loop(void) {
snprintf(printBuffer, sizeof(printBuffer), " Pass %3d", ++passno);
u8g2.clearBuffer(); // clear the internal memory
u8g2.setFont(u8g2_font_ncenB08_tr); // choose a suitable font
u8g2.drawStr(0, 10, " Hello XIAO RP2040!");
u8g2.drawStr(0, 30, printBuffer);
u8g2.drawStr(0, 50, "Best regards,");
u8g2.drawStr(0, 63, "davekw7x");
u8g2.sendBuffer(); // transfer internal memory to the display
delay(1000);
}Also tested u8x8 from the u8g2 library and the real eye-catcher from the Adafruit_SSD1306 library.
Unlike previous versions of the XIAO RP2040 board package, these all work with no changes to any Seeed files or any of the libraries that I tested.
Bottom line:
Huzzah! (But I said that already).
Regards,
Dave
Test_OLED_U8g2lib_2r7r2.zip (1.1 KB)
XIAO_RP2040_U8x8_GraphicsTest_2r7r2.zip (2.4 KB)
ssd1306_128x64_i2c_2r7r2.zip (3.4 KB)