LPC MicrocontrollersのトピックUsing 2 flash chips over SPIFI https://community.nxp.com/t5/LPC-Microcontrollers/Using-2-flash-chips-over-SPIFI/m-p/530291#M9977 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by jurrien on Thu Jan 22 02:46:59 MST 2015</STRONG><BR /><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I am using 2 flash chips to store and load data (not to execute from). I use some logic gates and a GPIO to gate the chip select of the flash chips and the SPIFI for reading and writing the data. When I use this to read something from the chips I can select one without any problem and read them. I do, however, have to call the spifi init function after I switch between the chips. This goes fine as long as I am only reading, but if I switch after a write operation the init function returns 0x2000A. My first though was that I had to wait until the write operation has completed before I switch between the flash chips. However, as far as I understand, calling the __ISB() followed with the __DSB() function should enforce this, but does not change the return value of the init call. Can anyone explain what changed after a write operation compared to the read operation and why the chip suddenly isn't recognized anymore? And what should I do to make this work, do I have to reset anything after a write and a switch between the chips?</SPAN><BR /><SPAN>Thanks in advance,</SPAN><BR /><BR /><SPAN>Jurrien</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:18:48 GMT lpcware 2016-06-15T18:18:48Z Using 2 flash chips over SPIFI https://community.nxp.com/t5/LPC-Microcontrollers/Using-2-flash-chips-over-SPIFI/m-p/530291#M9977 <HTML><HEAD></HEAD><BODY><STRONG>Content originally posted in LPCWare by jurrien on Thu Jan 22 02:46:59 MST 2015</STRONG><BR /><SPAN>Hello,</SPAN><BR /><BR /><SPAN>I am using 2 flash chips to store and load data (not to execute from). I use some logic gates and a GPIO to gate the chip select of the flash chips and the SPIFI for reading and writing the data. When I use this to read something from the chips I can select one without any problem and read them. I do, however, have to call the spifi init function after I switch between the chips. This goes fine as long as I am only reading, but if I switch after a write operation the init function returns 0x2000A. My first though was that I had to wait until the write operation has completed before I switch between the flash chips. However, as far as I understand, calling the __ISB() followed with the __DSB() function should enforce this, but does not change the return value of the init call. Can anyone explain what changed after a write operation compared to the read operation and why the chip suddenly isn't recognized anymore? And what should I do to make this work, do I have to reset anything after a write and a switch between the chips?</SPAN><BR /><SPAN>Thanks in advance,</SPAN><BR /><BR /><SPAN>Jurrien</SPAN></BODY></HTML> Wed, 15 Jun 2016 18:18:48 GMT https://community.nxp.com/t5/LPC-Microcontrollers/Using-2-flash-chips-over-SPIFI/m-p/530291#M9977 lpcware 2016-06-15T18:18:48Z