DAC.rar_DAC

/***************************************************************/ /* This Program is to demonstrate the On Chip DAC Functionality */ /**************************************************************** Author : Ashish Board : SBC_ARM7 Processor : LPC2148 DAC Mapping : DAC Output (AOUT)-> P0.25 Jumper Settings : No jumper selection *****************************************************************/ #include"LPC214x.h" #define DAC_DataMask 0x0000FFC0 #define DataShift 6 void DACInit(void) { PINSEL1 &= 0xFFF3FFFF; //Set P0.25 as AOUT Pin for analog output PINSEL1 |= 0x00080000; DACR = 1 << 16 ; //set the settling time to 2.5us and max current to 300uA } void delay(unsigned int time) { unsigned int i,j; for(i = 0; i < time; i++ ) for(j = 0; j < 10000 ; j++); } int main(void) { int i; DACInit(); // initialsie the DAC interface while(1) { for(i = 0 ; i < 1024 ;i++ ) // send data to DAC { DACR = ( DAC_DataMask & (i << DataShift)); delay(2); } for(i = 1023 ; i > 0 ;i-- ) // send data to DAC { DACR = ( DAC_DataMask & (i << DataShift)); delay(2); } } }