topic Problems writing to two files on an SD card simultaneously in MQX Software Solutions https://community.nxp.com/t5/MQX-Software-Solutions/Problems-writing-to-two-files-on-an-SD-card-simultaneously/m-p/355217#M11576 <HTML><HEAD></HEAD><BODY><P>We are testing writing to an SD card using the TWR-K60F120M board, running MQX4.1, with the HVAC demo and SD driver and MFS library included.&nbsp; We can open a file and read from it, then open two more files in write mode, but it will only work with the first file that is written to.&nbsp; Upon trying to write to the second file the task is blocked.&nbsp; This is the same whether I use fprintf(), or write().&nbsp; The file handles are not NULL, and it doesn't block when the files are open, only when written to some time later.&nbsp; I doubled the stack size (to 10kB) and it didn't help.</P><P></P><P>Is there a limitation with accessing multiple files through MQX MFS, or are we doing something wrong?</P><P></P><P>Thanks</P><P>Angelo</P></BODY></HTML> Tue, 30 Sep 2014 00:54:56 GMT ARQuattr 2014-09-30T00:54:56Z Problems writing to two files on an SD card simultaneously https://community.nxp.com/t5/MQX-Software-Solutions/Problems-writing-to-two-files-on-an-SD-card-simultaneously/m-p/355217#M11576 <HTML><HEAD></HEAD><BODY><P>We are testing writing to an SD card using the TWR-K60F120M board, running MQX4.1, with the HVAC demo and SD driver and MFS library included.&nbsp; We can open a file and read from it, then open two more files in write mode, but it will only work with the first file that is written to.&nbsp; Upon trying to write to the second file the task is blocked.&nbsp; This is the same whether I use fprintf(), or write().&nbsp; The file handles are not NULL, and it doesn't block when the files are open, only when written to some time later.&nbsp; I doubled the stack size (to 10kB) and it didn't help.</P><P></P><P>Is there a limitation with accessing multiple files through MQX MFS, or are we doing something wrong?</P><P></P><P>Thanks</P><P>Angelo</P></BODY></HTML> Tue, 30 Sep 2014 00:54:56 GMT https://community.nxp.com/t5/MQX-Software-Solutions/Problems-writing-to-two-files-on-an-SD-card-simultaneously/m-p/355217#M11576 ARQuattr 2014-09-30T00:54:56Z Re: Problems writing to two files on an SD card simultaneously https://community.nxp.com/t5/MQX-Software-Solutions/Problems-writing-to-two-files-on-an-SD-card-simultaneously/m-p/355218#M11577 <HTML><HEAD></HEAD><BODY><P>I added Kernel logging in the user_config to monitor the stack usage to confirm I was not running out of stack space, and after recompiling the PSP the file writing issue went away.&nbsp; I'm pretty sure nothing was changed in the PSP before, but I'm not sure if perhaps the projects (i.e. MFS, PSP, BSP, etc.) were built in the wrong order.</P></BODY></HTML> Thu, 02 Oct 2014 14:00:01 GMT https://community.nxp.com/t5/MQX-Software-Solutions/Problems-writing-to-two-files-on-an-SD-card-simultaneously/m-p/355218#M11577 ARQuattr 2014-10-02T14:00:01Z