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The Wire library has several useful functions for working with I2C. It makes it very easy to communicate on the I2C bus, and it can configure the Arduino to become either a master or a slave. Wire.endTransmission(true) //true=send stopĪrduino addresses are 7 bit (excluding RW bit), so I2C byte address 0x40 needs to be changed to 0x20 for arduino functions. The Arduino has a built-in library for working with I2C called the Wire Library.
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In Arduino function called attachInterrupt () to do this task, its syntax looks like. 0=success, 1=tx buff overrun, 2=NACK on address tx, 3=NACK on data tx, 4=other error Lets try one simple interrupt using Arduino UNO. If (Wire.endTransmission(false) = 0) //false=send restart (IMPORTANT-THIS ENDTRANSMISSION DOES NOT SEND STOP!). The default option is to use the Arduino Wire library, but there are other options if Wire is not. No need to send stop as done automatically h This will not likely change between your different projects. stm32duino fpexamples: provides several function packs that combine the usage of several x tiva uart - tiva adc (under construction) - bringing the analog world into the digital tiva i2c (under construction) - allows multiple slaves with just 2 wires additionally, the stock stm32 uart bootloader seems to be slow as hell, a bigger firmware tends.
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Uint8_t BytesReceived = Wire.available() //The slave can send less than was requested Wire.requestFrom(0x5a, 2) //Address, no of bytes Result: 0=success, 1=tx buff overrun, 2=NACK on address tx, 3=NACK on data tx, 4=other error Uint8_t Result = Wire.endTransmission(true) //true=send stop Seems to be 7 bit value with bit0=lower bit (not I2C RW bit), so left shifted by 1 when sent over the wire.