LPC Microcontrollers中的主题 Potential flash damage? https://community.nxp.com/t5/LPC-Microcontrollers/Potential-flash-damage/m-p/591146#M22185 <HTML><HEAD></HEAD><BODY><P>Hi I have created some PCBs based around the LPC1769, 10 of these boards have been assembled at an assembly house of which only 2 function.</P><P>I am programming these boards with a working bootloader program via flash magic, to get the lpc1769 into isp mode I pull pin 2.10 to ground as it is pulled high with a 10k resistor as well as reset. This allows the chip to enter into ispboot mode allowing communication via uart0, this has worked for 2 of the boards allowing the bootloader code to be programmed and they have functioned correctly.</P><P>With the other 8 boards imediately on power up the <SPAN>lpc1769</SPAN> enters isp boot mode without pin 2.10 being pulled to ground, I have checked this pin with my oscilloscope and can see it is high the entire time. I have also checked the individual supply inputs and they are all receiving a clean 3.3v supply?</P><P>So I can connect to flash magic and read the flash memory for these 8 boards, which has FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF value for all the sections.</P><P>After programming the bootloaader I cannot reset the&nbsp;<SPAN>lpc1769 and if I look at the flash memory I have the same value for all sections, so the program hasn't been stored in the flash.</SPAN></P><P><SPAN>Could this be caused by damage to the flash during the reflow solder process?</SPAN></P><P><SPAN>Any ideas to what might be causing this would be awesome,</SPAN></P><P><SPAN>cheers.</SPAN></P><P></P></BODY></HTML> Sun, 04 Sep 2016 01:49:58 GMT brookmatheson12 2016-09-04T01:49:58Z Potential flash damage? https://community.nxp.com/t5/LPC-Microcontrollers/Potential-flash-damage/m-p/591146#M22185 <HTML><HEAD></HEAD><BODY><P>Hi I have created some PCBs based around the LPC1769, 10 of these boards have been assembled at an assembly house of which only 2 function.</P><P>I am programming these boards with a working bootloader program via flash magic, to get the lpc1769 into isp mode I pull pin 2.10 to ground as it is pulled high with a 10k resistor as well as reset. This allows the chip to enter into ispboot mode allowing communication via uart0, this has worked for 2 of the boards allowing the bootloader code to be programmed and they have functioned correctly.</P><P>With the other 8 boards imediately on power up the <SPAN>lpc1769</SPAN> enters isp boot mode without pin 2.10 being pulled to ground, I have checked this pin with my oscilloscope and can see it is high the entire time. I have also checked the individual supply inputs and they are all receiving a clean 3.3v supply?</P><P>So I can connect to flash magic and read the flash memory for these 8 boards, which has FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF value for all the sections.</P><P>After programming the bootloaader I cannot reset the&nbsp;<SPAN>lpc1769 and if I look at the flash memory I have the same value for all sections, so the program hasn't been stored in the flash.</SPAN></P><P><SPAN>Could this be caused by damage to the flash during the reflow solder process?</SPAN></P><P><SPAN>Any ideas to what might be causing this would be awesome,</SPAN></P><P><SPAN>cheers.</SPAN></P><P></P></BODY></HTML> Sun, 04 Sep 2016 01:49:58 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Potential-flash-damage/m-p/591146#M22185 brookmatheson12 2016-09-04T01:49:58Z Re: Potential flash damage? https://community.nxp.com/t5/LPC-Microcontrollers/Potential-flash-damage/m-p/591147#M22186 <HTML><HEAD></HEAD><BODY><P>Hi，</P><P>It seems so weird, only two boards can works well, however others all failed.</P><P>I'd highly recommend you to program the these boards by using the external debugger, such as ULINK2, JLINK.</P><P>And It will jump out some messages to notify the device can't be programmed if the device had already been damaged.<BR />Have a great day,<BR />Ping</P><P></P><P>-----------------------------------------------------------------------------------------------------------------------<BR />Note: If this post answers your question, please click the Correct Answer button. Thank you!<BR />-----------------------------------------------------------------------------------------------------------------------</P></BODY></HTML> Wed, 07 Sep 2016 03:03:31 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Potential-flash-damage/m-p/591147#M22186 jeremyzhou 2016-09-07T03:03:31Z