DAC.rar_2407 dac.p_DAC_TMS320LF2407_ccs code dac7611

/*--------------------------------------------------------*/ /* SPECTRUM DIGITAL INC. */ /*--------------------------------------------------------*/ /* Offchip DAC test for EVM320LF2407 */ /* This test requires a loopback connector */ /*--------------------------------------------------------*/ /* */ /* filename: dac.c */ /* last update: 08/18/2005 by: LYP for 2407 */ /*--------------------------------------------------------*/ #include "dac.h" #include "LF2407REGS.h" #define MS_TIME_LOOP 0x0385 volatile unsigned int dacdata; #define MAX_DAC 4 unsigned int wait_ms( volatile unsigned int delay_val )//延时1ms程序 { unsigned int i; unsigned int ms_ctr; for ( i = 0; i < delay_val; i++ ) { ms_ctr = MS_TIME_LOOP; while ( ms_ctr ) { ms_ctr--; } } return( delay_val ); } void write_dac(unsigned int dac_num, unsigned int dac_val) //往DA通道写数 { unsigned int write_dac_status; if ( dac_num < MAX_DAC ) { dacdata = dac_val; /* put in global location */ switch (dac_num) { case DAC0: OUTMAC( _DAC0, dacdata); break; case DAC1: OUTMAC( _DAC1, dacdata); break; case DAC2: OUTMAC( _DAC2, dacdata); break; case DAC3: OUTMAC( _DAC3, dacdata); break; } asm(" nop" ); asm(" nop" ); asm(" nop" ); asm(" nop" ); asm(" nop" ); asm(" nop" ); OUTMAC( _DAC_XFER, dacdata); /* just need a write, any data */ } } void initsys(){ asm(" setc SXM "); asm(" clrc OVM "); asm(" clrc CNF "); *SCSR1=0x83fe; *WDCR =0x0e8; *IMR =0x000f; *IFR =0xffff; *WSGR =0x00; } void inline disable(){ asm(" setc INTM "); } void inline enable(){ asm(" clrc INTM "); } void interrupt nothing() {return;} void main() //程序输出方波，周期200ms { disable(); initsys(); while(1) {write_dac(0,4090);write_dac(1,4090);write_dac(2,4090);write_dac(3,4090); wait_ms(100); write_dac(0,0);write_dac(1,0);write_dac(2,0);write_dac(3,0); wait_ms(100);}; }