https://devzone.nordicsemi.com/f/nordic-q-a/7788/twi-sending-address-with-no-dataI need to send the following sequence of bits through TWI start bit | 7 bit address | write | slave ACK | stop bit I looked through the twi_hw_master.c and it seems that when you issue the TASKS_STARTTX both the ADDRESS and the TXD would be senten-USTelligent Community 13Tue, 19 Mar 2019 15:28:17 GMThttps://devzone.nordicsemi.com/thread/177127?ContentTypeID=1Tue, 19 Mar 2019 15:28:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:32ba8cb3-03c8-47e7-9f81-97899b18f357raphael_gsa<p>Hi,</p> <p>I have a pretty similar issue. I&#39;m using the si7210 Hall effect sensor from Silicon Labs. To wake&nbsp;the chip, a TWI frame like the one described above must be sent and nothing else. I looked for the software TWI library suggested bu Hung Bui but as it was 4 years ago and I&#39;m using the SDK version 15, it is now indicated as deprecated.&nbsp;</p> <p>Any new idea/solution for this issue.<br />Thanks a lot.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/27738?ContentTypeID=1Wed, 24 Jun 2015 08:56:36 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6a0adf66-717a-4b7b-aed5-742495947336Hung Bui<p>@Red Shaya: You are correct. Our hardware TWI wouldn&#39;t support transferring just ADDR without any payload. As you can find there is no EVENT back after the first ACK in the Figure 64 in the nRF51 Reference Manual.</p> <p>I would suggest you to use the software TWI library and modify it to match with your need. The twi_sw_master.c can be found at \components\drivers_nrf\twi_master\incubated in the SDK.</p><div style="clear:both;"></div>