Posted on May 12, 2005 at 09:08Are you trying to write it in C? If so, my advice is to try to write directly in ASM. If you want to move some data in XRAM you should enable it setting XPEN in the SYSCON register, XPERCON contains already a config with XRAM1 enabled. Then using some register, you should implement a small cycle to get data from S0RBUF and move it into your location (stored in a register). The cycle test a leght or a final location. To jump to your location, you can push the address into the stack and at the end use a RET instruction or use a JUMPS.. Anyway 32 bytes are enough to implement all.
For example:
BSET XPEN ;if you want to use XRAM1 2bytes
MOV R0,#0xAABB ;start address to be chosen, it could be an IRAM address. 4 bytes
loop: JNB S0RIR,loop ;4bytes
MOVB [R0],S0RBUF ;4bytes
BCLR S0RIR ;2bytes
CMPI1 R0,#0xCCDD ;end address,4bytes
JMPR cc_NE,loop ;2bytes
JMPS 0,0xAABB ;4bytes jump to target code
It should be working, maybe there are stupid errors but it's only my quick start point. You can adapt it to use other segment or to do something else. It is 26 bytes.
