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Assembly Source for Algorithms
PRELIMINARY
A-15
Assembly Source Listings and Program Examples
PRELIMINARY
A.1.4 Flash-Write Algorithm, SFLW20.ASM
This code is an implementation of the flash-write algorithm described in sec-
tion 3.4 on page 3-14.
Memory section: fl_wrt
Entry point: FLWS
Parameters to be declared and initialized by the calling code are:
- PROTECT defines the values of bits 8–15 of SEG_CTR during the flash-
write algorithm.
- SEG_ST defines the start address of the flash array to be recovered.
- SEG_END defines the end address of the flash array to be recovered.
Return value: ERROR (@BASE+15) 0=Pass, 1=Fail
**************************************************************
** FLASH–WRITE subroutine **
* **
* TMS320F2XX Flash Utilities. **
* Revision: 2.0, 9/10/97 **
* Revision: 2.1, 1/31/98 **
* **
* Filename: sflw20.asm **
* **
* Called by : c2xx_bfx.asm or flash application programs. **
* **
* !!CAUTION – INITIALIZE DP BEFORE CALLING THIS ROUTINE!! **
* **
* Function: Performs flash writes on flash array 0/1 as **
* specified by the following vars: **
* SEG_ST Array segment start address **
* PROTECT Sector protect enable **
* *
* The flash–write pulse duration used is 14 ms, and a *
* maximum of 10000 pulses is applied until the device *
* passes the depletion test. *
* *
* The following resources are used for temp storage: *
* AR0 Used for comparison *
* AR1 Flash–Write Pulse Count *
* AR2 Used for main BANZ loop *
* AR6 Parameter passed to DELAY *
* BASE_0 Parameter passed to SET_MODE *
* BASE_1 Used for flash address *
* BASE_2 Used for flash data *