Texas Instruments TMS320F20x/F24x DSP A.4 Sample C Code to Erase and Reprogram the TMS320F206

PRELIMINARY

Sample C Code to Erase and Reprogram the TMS320F206

A.4 Sample C Code to Erase and Reprogram the TMS320F206

Because the algorithm implementations do not follow the C-calling convention of the 'C2000 C environment, they cannot be used directly from C. The assem- bly code of section A.2, C-Callable Interface to Flash Algorithms, is provided as a C-callable interface to the programming algorithms. The following C source file and linker command file provide a working example for the 'F206. In this example, the algorithms reside in the on-chip SARAM, and either flash0 or flash1 can be reprogrammed. The code can be relocated anywhere in pro- gram space, with the exceptions described in section A.3, Using the Algo- rithms With Assembly Code.

A.4.1 C Code That Calls the Interface to Flash Algorithms for TMS320F206 /***************************************************/

/*	Filename: sample.c				*/
/*	Description: This is an example of how to				*/
/*	program the 'F2XX flash from C code.				*/
/*	The C±callable interface for the standard				*/
/*	flash algorithms is used. This interface is				*/
/*	defined in the file <flash.asm>, as two				*/
/*	C±callable functions: erase(), and program()				*/
/*	At link time, this example must be combined				*/
/*	with the code in <flash.asm> as well as with				*/
/*	the object modules for the standard algos.				*/
/***************************************************/
/*	This example is set up for the TMS320F206,				*/
/*	and uses the SARAM as a buffer for programming */
/*	data. The code first erases module1,				*/
/*	then programs the first three locations.				*/
/***************************************************/
/*	Rev1.0			10/97 RDP */
/***************************************************/
extern		int	erase();	/* Declare external func for flash erase. */
extern		int	program();	/* Declare external func for flash programming. */
main()
{

int *a;

if (erase(0xff00,0x4000,0x7fff))

{/*Flash is erased, now let's program it.*/ /* Init program buffer. */

a=(int *)0xC00; /*Use last 3K of SARAM for data buffer*/ a[0]=0x7A80;

a[1]=0x0FDF;

a[2]=0x7A80;

/*Program the flash from the buffer*/ if (program(0xff00,0xc00,0x4000,0x3))

{/*Flash programmed ok.*/ while(1){} /*Spin here forever*/

}

else

PRELIMINARY Assembly Source Listings and Program Examples A-37