LPC1768 ADC0.4

oceansea — Thu, 28 Nov 2019 09:00:54 GMT

hi,i use the LPC1768 ,

when i use the ADC , i found a problem , i use all the 8 ch,

i use the same signal to test all the ch,

the ch0 ch1 ch2 ch3 ch5 ch6 is OK,but the ch4 have problem

it show

not a line ,and i use oscillscope test the waveform ,it's ok ,not any problem.

this is my prj ,only the ch4 have problem !!!

void ADCInit( uint32_t ADC_Clk )
{
uint32_t i;

LPC_SC->PCONP |= (0x1<<12); /* Ê¹ÄÜADCÊ±ÖÓ . */

for ( i = 0; i < ADC_NUM; i++ )
{
ADCValue[i] = 0x0;
}
/*
* ÅäÖÃADC¹Ü½Å
*/
#if ADCCH0_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<14); //P0.23AD0.0
LPC_PINCON->PINSEL1 |= 0X01<<14;
LPC_GPIO0->FIODIR &=~(0x01<<23);//ADC0.0
#endif

#if ADCCH1_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<16); //P0.24ADC0.1
LPC_PINCON->PINSEL1 |= 0X01<<16;
LPC_GPIO0->FIODIR &=~(0x01<<24);//ADC0.1
#endif

#if ADCCH2_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<18); //P0.25ADC0.2
LPC_PINCON->PINSEL1 |= 0X01<<18;
LPC_GPIO0->FIODIR &=~(0x01<<25);//ADC0.2
#endif

#if ADCCH3_EN
LPC_PINCON->PINSEL1 &= ~(0X03<<20); //P0.26ADC0.3
LPC_PINCON->PINSEL1 |= 0X01<<20;
LPC_GPIO0->FIODIR &=~(0x01<<26);//ADC0.3
#endif

#if ADCCH4_EN
LPC_PINCON->PINSEL3 &=~(0x03<<28); //P1.30AD0.4
LPC_PINCON->PINSEL3 |=0x03<<28;
LPC_GPIO1->FIODIR &=~(0x01<<30);//ADC0.4
#endif

#if ADCCH5_EN
LPC_PINCON->PINSEL3 &=~0xC0000000; //P1.31AD0.5
LPC_PINCON->PINSEL3 |=0xC0000000;
LPC_GPIO1->FIODIR &=~0x80000000;//ADC0.5
#endif

#if ADCCH6_EN
LPC_PINCON->PINSEL0 &=~(0X03<<6); //P0.3--ADC0.6
LPC_PINCON->PINSEL0 |=0X01<<7;
LPC_GPIO0->FIODIR &=~(0X01<<3);//ADC0.6
#endif

#if ADCCH7_EN
LPC_PINCON->PINSEL0 &=~(0X03<<4); //P0.2--ADC0.7
LPC_PINCON->PINSEL0 |=0X01<<5;
LPC_GPIO0->FIODIR &=~(0X01<<2);//ADC0.7
#endif

LPC_ADC->ADCR = ( 0x01 << 0 ) | /* SEL=1,select channel 0~7 on ADC0 */
((SystemFrequency/ADC_Clk-1)<<8) | /* CLKDIV = Fpclk / ADC_Clk - 1 */
( 0 << 16 ) | /* BURST = 0, Èí¼þ¿ØÖÆ×ª»» */
( 1 << 21 ) | /* PDN = 1, ´¦ÓëÕý³£Ä£Ê½ */
( 0 << 24 ) | /* START = 0 ²»Æô¶¯AD×ª»» */
( 0 << 27 ); /* EDGE = 0 ÉÏÉýÑØÆô¶¯ */

#if ADC_INTERRUPT_FLAG
NVIC_EnableIRQ(ADC_IRQn);

LPC_ADC->ADINTEN = 0xFF; /* Í¨µÀ0×ª»»½áÊø²úÉúÖÐ¶Ï */
#endif
return;
}

uint32_t ADCRead( uint8_t channelNum )
{
#if !ADC_INTERRUPT_FLAG
uint32_t regVal, ADC_Data;
#endif

if ( channelNum >= ADC_NUM )
{
channelNum = 0; /* ÊäÈëchannelNum´óÓÚ8£¬ÔòÉèÖÃ¸Ã²ÎÊýÎª0 */
}
LPC_ADC->ADCR &= 0xFFFFFF00;
LPC_ADC->ADCR &=~(0x03<<25);
LPC_ADC->ADCR |= (1 << 24) | (1 << channelNum);
/* Ñ¡Ôñ¶ÔÓ¦Í¨µÀÁ¢¼´Æô¶¯×ª»» */
#if !ADC_INTERRUPT_FLAG
while ( 1 ) /* µÈ´ýADC×ª»»Íê³É */
{
regVal = LPC_ADC->DR[channelNum];
if ( regVal & ADC_DONE )
{
break;
}
}

LPC_ADC->CR &= 0xF8FFFFFF; /* Í£Ö¹ADC */
/*
* Èç¹ûÃ»ÓÐ·¢Éúoverrun´íÎó£¬Ôò±£´æÊý¾Ý
*/
if ( regVal & ADC_OVERRUN )
{
return ( 0 );
}
#if ADC_12BITS
ADC_Data = ( regVal >> 4 ) & 0xFFF;
#else
ADC_Data = ( regVal >> 6 ) & 0x3FF;
#endif
return ( ADC_Data ); /* ·µ»ØADC²ÉÑùÊý¾Ý */
#else
return ( channelNum );
#endif
}

void ADC_WOrk(void)
{
unsigned int Ins_read=0,Ins_re=0;

ADCRead(0);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[0];
ADCDataInput[0] = Ins_read*1320/4095;
ADCDataInput[0] =1200-ADCDataInput[0];

ADCRead(1);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[1];
ADCDataInput[1] = Ins_read*1320/4095;
ADCDataInput[1] =1200-ADCDataInput[1];

ADCRead(2);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[2];
ADCDataInput[2] = Ins_read*1320/4095;
ADCDataInput[2] =1200-ADCDataInput[2];

ADCRead(3);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[3];
ADCDataInput[3] = Ins_read*1320/4095;
ADCDataInput[3] =1200-ADCDataInput[3];

ADCRead(4);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[4];
Ins_read =Ins_read*1320/4095;
//ADCDataInput[4] =1200-Ins_read;
Ins_re =1200-Ins_read;
ADCDataInput[4] =(Ins_re+ADCDataInput[4]*7)/8;

ADCRead(5);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[5];
ADCDataInput[5] = Ins_read*1320/4095;
ADCDataInput[5] =1200-ADCDataInput[5];

ADCRead(6);
while(!ADCIntDone);
ADCIntDone = 0;
Ins_read = ADCValue[6];
ADCDataInput[6] = Ins_read*1320/4095;
ADCDataInput[6] =1200-ADCDataInput[6];

}

Re: LPC1768 ADC0.4

jeremyzhou — Fri, 29 Nov 2019 03:15:11 GMT

Hi ,

Thank you for your interest in NXP Semiconductor products and
the opportunity to serve you.
To provide the fastest possible support, I've attached an ADC demo project, please refer to it for details.

Have a great day,
TIC

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