PRELIMINARY
Using the Algorithms With C Code to Erase and Reprogram the 'F240
OR | #06fh | ; | set WDDIS | bit | and WDCHK2:0 bits, WDCLK to max. |
SACL | WDCR | ; | write ACC | out | to WDTCR |
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* Step 9. Deallocate the local frame*
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SBRK 1+1 | ; deallocate frame, point to saved FP |
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* Step 10. restore the frame pointer | * | |
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LAR AR0,*± ; pop FP
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* Step 11. copy the return address from the s/w stack and push onto h/w *
* stack*
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PSHD * | ; push return address on h/w stack |
RET | ; return |
.en |
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A.6.4 C Functions for Initializing the TMS320F240
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* | TMS320x240 Initialization Function | * |
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* Arguments passed from Caller: None | * |
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* | Local Variables: | None | * |
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*********************************************************************** |
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SYSSR | .set | 0701Ah |
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SYSCR | .set | 07018h |
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WDTCR | .set | 07029h | ;WD Control reg |
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CKCR0 | .set | 0702ah | ;PLL Clock Control Register 0 |
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CKCR1 | .set | 0702ch | ;PLL Clock Control Register 1 |
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DP_PF1 | .set | 224 |
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| .globl _c240init |
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| .text |
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| .def | _c240init |
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_c240init: |
| ; presume ARP = AR1 (SP)** |
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* On entry, presume ARP = AR1 (SP) |
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* Step 1. pop the return address off the h/w stack and push to s/w stack | * | |||||
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POPD *+ | ; pop return address, push on software stack |
;ARP=AR1, SP=SP+1
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* Step 2. push the frame pointer onto s/w stack*
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SAR AR0,*+ | ; push AR0 (FP) onto SP |
;ARP=AR1, SP=SP+2
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* Step 3. Allocate the local frame*
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SAR | AR1,* | ; *SP = FP |
LAR | AR0,#1 | ; FP = size of local frame, 1 |
LAR | AR0,*0+ | ; FP = SP, SP += size ==> allocate frame |
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PRELIMINARY | Assembly Source Listings and Program Examples |
