EBC Exercise 30 PRU porting pasm to clpru
Embedded Linux Class by Mark A. Yoder
http://processors.wiki.ti.com/index.php/PRU_Assembly_Instructions#pasm_vs._clpru has better notes that I have here.
Here are some notes on things to watch for when converting from pasm assembly to clpru. Much of this came from http://www.ti.com/lit/ug/spruhv6a/spruhv6a.pdf
| pasm | clpru | Notes | |
|---|---|---|---|
| Comments | \\ | ; | Start comments with ; |
| Loading constants | MOV r0, 0x0000 | LDI r0, 0x0000 | pasm generalized MOV to not only move registers (MOV r0, r1), but also
moving immediate values (MOV r0, 0x0). The MOV in clpru is only for moving registers. |
| Loading 32-bit constants | MOV r0, 0xffffffff | LDI32 r0, 0xffffffff | If you are loading more than 16 bits, use LDI32. |
| load/store byte burst | LBBO r2, r1, 0, 4 | LBBO &r2, r1, 0, 4 | An & is needed before the first register of LBBO, SBBO, LBCO or SBCO. |
| Substitution Symbols | #define CH1BIT r30.t8 | .asg r30.t8, CH1BIT | Be sure the . isn't in the first column. |
Embedded Linux Class by Mark A. Yoder
