Hi
I need to implement I2C slave side (up to 100kBit/s) on a nRF51822 chip. As far as i see the inegrated TWI peripherial only supportes the master side. Any ideas how to do it? The following ways came to my mind, but all seam not the way to go.
Software I2C There are some code segments around to implement a software I2C solution by bitbanging. These solutions often are unstable and probably not fast enough to reach 100kBit/s. Additionally it may be a problem to run it beside the active S110 softdevice, because the softdevice may block the CPU in low stack for multiple milliseconds.
External Peripherial Another possible way is to use an external chip to do the I2C, but to be honest i didn't find a simple solution there. The only way to do it this way is the connect a PIC or something similar to the Nordic and implement the I2C on the PIC. The Nordic could communicate with the PIC over UART or SPI. Are the fix programmed chips that can be used as external peripherial?
Any other thought about this?
Regards Adrian
