topic Cannot establish communication between K60 tower board and CY8320 development board with Cypress IC CY8CMBR3116 via I2C in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/Cannot-establish-communication-between-K60-tower-board-and/m-p/683842#M42101 <HTML><HEAD></HEAD><BODY><TABLE style="color: #242729; background-color: #ffffff; border: 0px; font-size: 13px;"><TBODY style="border: 0px; font-size: 13px;"><TR style="border: 0px; font-size: 13px;"><TD class="" style="border: 0px; font-size: 13px; padding: 0px 15px 0px 0px;"><DIV class="" style="border: 0px; font-size: 13px;"><SPAN class="" style="color: #6a737c; border: 0px; font-size: 20px; margin: 8px 0px;">0</SPAN><A style="color: #0077cc; border: 0px; text-decoration: none; text-indent: -9999em; font-size: 1px; margin: 0px auto 10px;" title="This question does not show any research effort; it is unclear or not useful">down vote</A><A href="https://electronics.stackexchange.com/questions/305855/not-getting-proper-acknowledgement-and-stop-condition-on-i2c-bus?noredirect=1" style="color: #0077cc; border: 0px; text-decoration: none; text-indent: -9999em; font-size: 1px; margin: 0px auto 2px;" title="Click to mark as favorite question (click again to undo)">favorite</A><DIV class="" style="border: 0px; font-size: 13px;"> </DIV></DIV></TD><TD class="" style="border: 0px; font-size: 13px;"><DIV style="border: 0px; font-size: 13px;"><DIV class="" style="border: 0px; margin: 0px 0px 5px;"><P style="border: 0px; margin: 0px 0px 1em;">I am trying to communicate Kinetis K60 tower board with a Cypress IC CY8CMBR3116 cy8320 development board as slave IC. There are only two devices on the I2C bus. I am attaching a snapshot of the communication taking place on the I2C bus.</P><P style="border: 0px; margin: 0px 0px 1em;"><span class="lia-inline-image-display-wrapper" image-alt="tek00004.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21137i04111653A0947CDE/image-size/large?v=v2&amp;px=999" role="button" title="tek00004.png" alt="tek00004.png" /></span></P></DIV></DIV></TD></TR></TBODY></TABLE><P style="color: #242729; background-color: #ffffff; border: 0px; margin: 0px 0px 1em;">The problem is that the acknowledgment is not low enough for the master to detect and even the stop condition is not correct. This is happening after sending the default address of 0X37 to the cypress IC.</P><P style="color: #242729; background-color: #ffffff; border: 0px; margin: 0px 0px 1em;">Please tell me the reason for this output.</P></BODY></HTML> Wed, 17 May 2017 11:16:10 GMT chromeankit 2017-05-17T11:16:10Z Cannot establish communication between K60 tower board and CY8320 development board with Cypress IC CY8CMBR3116 via I2C https://community.nxp.com/t5/Kinetis-Microcontrollers/Cannot-establish-communication-between-K60-tower-board-and/m-p/683842#M42101 <HTML><HEAD></HEAD><BODY><TABLE style="color: #242729; background-color: #ffffff; border: 0px; font-size: 13px;"><TBODY style="border: 0px; font-size: 13px;"><TR style="border: 0px; font-size: 13px;"><TD class="" style="border: 0px; font-size: 13px; padding: 0px 15px 0px 0px;"><DIV class="" style="border: 0px; font-size: 13px;"><SPAN class="" style="color: #6a737c; border: 0px; font-size: 20px; margin: 8px 0px;">0</SPAN><A style="color: #0077cc; border: 0px; text-decoration: none; text-indent: -9999em; font-size: 1px; margin: 0px auto 10px;" title="This question does not show any research effort; it is unclear or not useful">down vote</A><A href="https://electronics.stackexchange.com/questions/305855/not-getting-proper-acknowledgement-and-stop-condition-on-i2c-bus?noredirect=1" style="color: #0077cc; border: 0px; text-decoration: none; text-indent: -9999em; font-size: 1px; margin: 0px auto 2px;" title="Click to mark as favorite question (click again to undo)">favorite</A><DIV class="" style="border: 0px; font-size: 13px;"> </DIV></DIV></TD><TD class="" style="border: 0px; font-size: 13px;"><DIV style="border: 0px; font-size: 13px;"><DIV class="" style="border: 0px; margin: 0px 0px 5px;"><P style="border: 0px; margin: 0px 0px 1em;">I am trying to communicate Kinetis K60 tower board with a Cypress IC CY8CMBR3116 cy8320 development board as slave IC. There are only two devices on the I2C bus. I am attaching a snapshot of the communication taking place on the I2C bus.</P><P style="border: 0px; margin: 0px 0px 1em;"><span class="lia-inline-image-display-wrapper" image-alt="tek00004.png"><img src="https://community.nxp.com/t5/image/serverpage/image-id/21137i04111653A0947CDE/image-size/large?v=v2&amp;px=999" role="button" title="tek00004.png" alt="tek00004.png" /></span></P></DIV></DIV></TD></TR></TBODY></TABLE><P style="color: #242729; background-color: #ffffff; border: 0px; margin: 0px 0px 1em;">The problem is that the acknowledgment is not low enough for the master to detect and even the stop condition is not correct. This is happening after sending the default address of 0X37 to the cypress IC.</P><P style="color: #242729; background-color: #ffffff; border: 0px; margin: 0px 0px 1em;">Please tell me the reason for this output.</P></BODY></HTML> Wed, 17 May 2017 11:16:10 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Cannot-establish-communication-between-K60-tower-board-and/m-p/683842#M42101 chromeankit 2017-05-17T11:16:10Z Re: Cannot establish communication between K60 tower board and CY8320 development board with Cypress IC CY8CMBR3116 via I2C https://community.nxp.com/t5/Kinetis-Microcontrollers/Cannot-establish-communication-between-K60-tower-board-and/m-p/683843#M42102 <HTML><HEAD></HEAD><BODY><P>Hello Ankit Kumar,</P><P></P><P>Please double check that you have enabled the open-drain feature for the pins that you are using for the I2C bus (PORTx_PCRn[ODE] = 1).</P><P></P><P>Regards!</P><P>Jorge Gonzalez</P></BODY></HTML> Wed, 24 May 2017 20:10:48 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/Cannot-establish-communication-between-K60-tower-board-and/m-p/683843#M42102 Jorge_Gonzalez 2017-05-24T20:10:48Z