Texas Instruments TMS320F20x/F24x DSP manual A.1.4 Flash-Write Algorithm, SFLW20.ASM, Preliminary

PRELIMINARY

Assembly Source for Algorithms

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		*

PRELIMINARY Assembly Source Listings and Program Examples A-15