topic Re: KL81 SWD access timeout in Kinetis Microcontrollers https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597524#M35005 <HTML><HEAD></HEAD><BODY><P>Another update, I made a silly mistake: didn't disable interrupt during Flash operation. Now all the Flash operations work fine after I disable the interrupts.</P></BODY></HTML> Mon, 20 Mar 2017 22:30:51 GMT daweiy 2017-03-20T22:30:51Z KL81 SWD access timeout https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597522#M35003 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I have a board with KL81 amounted on it. I use IAR and J-link to debug it.</P><P></P><P>Everything was fine, until I started Flash programming test, I have killed 3 boards! The test I have done is just following the flash driver example in SDK’s driver examples.</P><P>&nbsp;</P><P>What I found is if I erase one sector, the software resets. The reset is caused in one of the lines in function<SPAN style="color: black;"> FlashCommandSequence()(I have put this function into RAM). If I trace this function one line by one line, there is no reset. So I added a delay after CCIF bit is set and the erasing seems fine. But when the code try to write something into this sector, reset happens again. Is there any configration I need to double check? Please advise!<BR /></SPAN></P><P><SPAN style="color: black;">&nbsp;</SPAN></P><P><SPAN style="color: black;">After I tried few tests, suddenly my IAR IDE cannot connect to my board through the J-Link. The error message is: "Communication timed out: Requested 20 bytes, received 0 bytes! </SPAN></P><P><SPAN style="color: black;">Could not read hardware status!</SPAN></P><P><SPAN style="color: black;">Abort Debug session?"</SPAN></P><P></P><P><SPAN style="color: black;">I tried to use J-Link Commander, same results.I am pretty sure this J-Link is working because I can use it to connect to STM32 mcu. Below is the screen shot of the J-Link Commander</SPAN></P><P><SPAN style="color: black;"><span class="lia-inline-image-display-wrapper" image-alt="tt.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/16462i5C54FA2893FE0B65/image-size/large?v=v2&amp;px=999" role="button" title="tt.jpg" alt="tt.jpg" /></span><BR /></SPAN></P></BODY></HTML> Mon, 20 Mar 2017 03:33:28 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597522#M35003 daweiy 2017-03-20T03:33:28Z Re: KL81 SWD access timeout https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597523#M35004 <HTML><HEAD></HEAD><BODY><P>Just a quick update: I connected SWD nRESET pin to MCU's RESET_b pin and SWD NC(pin 9) to ground, my J_Link can connect to KL81.</P><P></P><P>But my first question, Flash sector erasing can cause system reset, is still unsolved, please advise, thanks!</P></BODY></HTML> Mon, 20 Mar 2017 05:28:24 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597523#M35004 daweiy 2017-03-20T05:28:24Z Re: KL81 SWD access timeout https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597524#M35005 <HTML><HEAD></HEAD><BODY><P>Another update, I made a silly mistake: didn't disable interrupt during Flash operation. Now all the Flash operations work fine after I disable the interrupts.</P></BODY></HTML> Mon, 20 Mar 2017 22:30:51 GMT https://community.nxp.com/t5/Kinetis-Microcontrollers/KL81-SWD-access-timeout/m-p/597524#M35005 daweiy 2017-03-20T22:30:51Z