problem in block switching

[babidesai123]

Posted on April 23, 2003 at 12:34

problem in block switching

[babidesai123]

Posted on May 17, 2011 at 11:53

Hello,

We are facing some problems in block switching from secondary to primary & viceversa. Details: Configuration in PSD SOFT EXPRESS: rs0: 8000 87FF CSIOP: 5200 52FF FS0: 0000 3FFF PAGE0 DATA SPACE FS1: 0000 3FFF PAGE 1 CSBOOT0: 0000 1FFF CODE SPACE CSBOOT1: 2000 3FFF CSBOOT2: 4000 5FFF CSBOOT3: 6000 7FFF WHILE SWITCHING THE BLOCK, WE ARE WRITTING TO PAGE REG & VM REGISTER . & THEN ljmp 0x0000 eg.switching from primary to secondary/ boot memory block mov dptr,#0x52e0 ; Accessing the page register mov a,#0x00 ; movx @dptr,a mov dptr,#0x52e2 ; Accessing the VM register mov a,#0x12 ;JUMP TO SEC FLASH (primary=data, sec=code) movx @dptr,a ljmp 0x0000 ; location to start the second routine but with this we are not able to jump to secondary.at loaction 0x0000 if we write poweron(main initialization) routine above org 0x0290 then only we are able to switch the block. I would like to know the reason behind this!! Since we are trying to write iap code in C ( resides in secondary ) in C we are finding difficult to write function at absolute address. PlZ help!

[yu-jun]

Posted on May 17, 2011 at 11:53

switching from primary to secondary/ boot memory block

mov dptr,#0x52e0 ; Accessing the page register mov a,#0x00 ; movx @dptr,a mov dptr,#0x52e2 ; Accessing the VM register mov a,#0x12 ;JUMP TO SEC FLASH (primary=data, sec=code) movx @dptr,a ljmp 0x0000 ; location to start the second routine All goal Hex get from all above code must be in the same address in the first/secound page.

[babidesai123]

Posted on May 17, 2011 at 11:53

sorry i couldn't get ..what you mean by 'must be in the same address in the first/second page.

what more i have tried is. i wrote the same code in both the blocks(primary as well as boot block)then without specifying the org it works. but if i write the same code in priomary block fs1 then it's not able to come back from that block. IS IT SOMETHING THAT BLOCK SWITCHING ROUTINE HAS TO BE IN THE SAME ADDRESS SPACE(HEX LOCATION) FOR ALL THE BLOCKS WE USE(FS0,FS1,CSBOOT0)????

[babidesai123]

Posted on May 17, 2011 at 11:53

THANKS ALOT!!!

IT WORKS FINE WITH THIS.. is there any means to put the C functions at some particular address(absolute address)?? So that the block switching functions, we can put to some common address space. With assembly language it is quite easy. but IAP code is written in C & application code is in assembly. Once again thanks lot!