LPC MicrocontrollersのトピックEMC hang on system reset LPC1788 https://community.nxp.com/t5/LPC-Microcontrollers/EMC-hang-on-system-reset-LPC1788/m-p/517009#M1964 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by shweta.kosamkar on Wed Aug 28 05:12:40 MST 2013</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I am using LPC1788 in one of our project. There we are interfacing external flash M29W640FB using EMC. we have develped secondary bootloader based on USB stick. </SPAN><BR /><SPAN>Bootloader firmware is downloading the application image stored on USB stick and then after downloading it jumps to application image. If I repeat the same procedure continuously i.e get the image from usb and flah the code into internal and external flash then after some 6-7 retries, flashing the code into external flash is failed. That instance I observed that chip select of the EMC is not going low. it permanently ties to high level. Only after power cycle it gets recover.</SPAN><BR /><SPAN>Before jump to application code I have de-initialize the EMC by disabling the power of EMC in PCOCNP register. and in application image, EMC is again re-initializing.</SPAN><BR /><SPAN>Please guide me on tha same.</SPAN><BR /><SPAN>Thanx in advance.</SPAN><BR /><BR /><SPAN>With Regards,</SPAN><BR /><SPAN>Shweta</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:26:45 GMT lpcware 2016-06-15T17:26:45Z EMC hang on system reset LPC1788 https://community.nxp.com/t5/LPC-Microcontrollers/EMC-hang-on-system-reset-LPC1788/m-p/517009#M1964 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by shweta.kosamkar on Wed Aug 28 05:12:40 MST 2013</STRONG><BR /><SPAN>Hi,</SPAN><BR /><BR /><SPAN>I am using LPC1788 in one of our project. There we are interfacing external flash M29W640FB using EMC. we have develped secondary bootloader based on USB stick. </SPAN><BR /><SPAN>Bootloader firmware is downloading the application image stored on USB stick and then after downloading it jumps to application image. If I repeat the same procedure continuously i.e get the image from usb and flah the code into internal and external flash then after some 6-7 retries, flashing the code into external flash is failed. That instance I observed that chip select of the EMC is not going low. it permanently ties to high level. Only after power cycle it gets recover.</SPAN><BR /><SPAN>Before jump to application code I have de-initialize the EMC by disabling the power of EMC in PCOCNP register. and in application image, EMC is again re-initializing.</SPAN><BR /><SPAN>Please guide me on tha same.</SPAN><BR /><SPAN>Thanx in advance.</SPAN><BR /><BR /><SPAN>With Regards,</SPAN><BR /><SPAN>Shweta</SPAN></BODY></HTML> Wed, 15 Jun 2016 17:26:45 GMT https://community.nxp.com/t5/LPC-Microcontrollers/EMC-hang-on-system-reset-LPC1788/m-p/517009#M1964 lpcware 2016-06-15T17:26:45Z