![]() ![]() STM32 has Two I2C bus while Arduino Uno only has one I2C bus and STM32 is faster than Arduino. To know more about STM32 board, check other STM32 projects.Ĭomparing I2C (Inter Integrated Circuits) in STM32F103C8 Blue Pill board with Arduino Uno, then we will see that Arduino has ATMEGA328 microcontroller in it, and STM32F103C8 has ARM Cortex- M3 in it. In this tutorial, we will use I2C bus for communication between Arduino and STM32F103C8, and will learn about SPI bus in next tutorial. So it would be great to learn about communication between STM32 and Arduino by using SPI & I2C bus. STM32 has more features than Arduino board. In this tutorial we will replace one Arduino board with the Blue Pill board that is STM32F103C8 and will communicate with the Arduino board using I2C bus. Can you help? Thanks.In our previous tutorials, we have learned about SPI and I2C communication between two Arduino boards. ![]() I’m probably doing something dumb, but I’m not seeing it. I can tell that something is happening, because the code completes in 3-4 seconds with no pin connections, it takes a bit over 60 seconds (as expected to scan 127 addresses with a 1/2 second timeout). I’ve tried it at 100KHz, 400KHz, 1MHz with the same result. ![]() Seed.PrintLine("I2C device found at address %x !", prAddress) Īnd the output when the Seed is connected (pins 12/13 on the pinout): Daisy is online Int prAddress = (address < 16) ? 0 : address = _i2c.TransmitBlocking(address, &testData, 1, 500) Static constexpr I2CHandle::Config _i2c_configįor(unsigned char address = 1 address < 127 address++) Here’s my libdaisy version: #include "daisy_seed.h" Serial.println("No I2C devices found\n") ĭelay(5000) // wait 5 seconds for next scanĪnd the output (connected via A4/A5 to 3 daisy-chained (!) GPIO boards: Scanning. Serial.print("I2C device found at address 0x") Here’s the i2cScanner code from Arduino that I’m porting: #include įor(byte address = 1 address < 127 address++ ) I wonder if you’d have a look at my code? ![]() I thought I understood everything based on your comments, Stephen, but I’m having no success. ![]()
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