adc.c

00001 /*
00002  * adc.c
00003  *
00004  *  Created on: 02/07/2011
00005  *      Author: francisco
00006  */
00007 
00008 #include <LPC17xx.h>
00009 #include "adc.h"
00010 
00011 void init_adc(int adc_clk)
00012 {
00013     // Turn on power to ADC block
00014     LPC_SC->PCONP |=  PCADC;
00015 
00016     // Turn on ADC peripheral clock
00017         LPC_SC->PCLKSEL0 &= ~(3 << PCLK_ADC);
00018         LPC_SC->PCLKSEL0 |=  (ADC_CCLK << PCLK_ADC);    //CLK/8
00019 
00020         unsigned int clkdiv = (SystemCoreClock/1)/65;
00021         clkdiv = clkdiv/adc_clk;
00022 
00023         LPC_ADC->ADCR &= ~(ADC_OPERATIONAL|ADC_CLKDIV(255));
00024         LPC_ADC->ADCR |= (ADC_OPERATIONAL|ADC_CLKDIV(clkdiv));
00025 
00026     //NVIC_EnableIRQ(ADC_IRQn);
00027 }
00028 
00029 void setup_start(int mode,int edge)
00030 {
00031     LPC_ADC->ADCR |= mode;
00032 }
00033 
00034 void select_channels(int adc_ch)
00035 {
00036     LPC_ADC->ADCR &= ~(ADC_CH_0|ADC_CH_1|ADC_CH_2|ADC_CH_3|ADC_CH_4|ADC_CH_5|ADC_CH_6|ADC_CH_7);
00037     LPC_ADC->ADCR |= adc_ch;
00038 
00039     LPC_ADC->ADINTEN |= (1U<<8);//adc_ch;
00040 
00041     if(adc_ch&ADC_CH_0)
00042     {
00043         LPC_PINCON->PINSEL1 |= 1U<<14;
00044         LPC_PINCON->PINMODE1 |= 2U<<14;
00045     }
00046     if(adc_ch&ADC_CH_1)
00047     {
00048         LPC_PINCON->PINSEL1 |= 1U<<16;
00049         LPC_PINCON->PINMODE1 |= 2U<<16;
00050     }
00051     if(adc_ch&ADC_CH_2)
00052     {
00053         LPC_PINCON->PINSEL1 |= 1U<<18;
00054         LPC_PINCON->PINMODE1 |= 2U<<18;
00055     }
00056     if(adc_ch&ADC_CH_3)
00057     {
00058         LPC_PINCON->PINSEL1 |= 1U<<20;
00059         LPC_PINCON->PINMODE1 |= 2U<<20;
00060     }
00061     if(adc_ch&ADC_CH_4)
00062     {
00063         LPC_PINCON->PINSEL3 |= 3U<<28;
00064         LPC_PINCON->PINMODE3 |= 2U<<28;
00065     }
00066     if(adc_ch&ADC_CH_5)
00067     {
00068         LPC_PINCON->PINSEL3 |= 3U<<30;
00069         LPC_PINCON->PINMODE3 |= 2U<<30;
00070     }
00071     if(adc_ch&ADC_CH_6)
00072     {
00073         LPC_PINCON->PINSEL0 |= 2U<<6;
00074         LPC_PINCON->PINMODE0 |= 2U<<6;
00075     }
00076     if(adc_ch&ADC_CH_7)
00077     {
00078         LPC_PINCON->PINSEL0 |= 2U<<4;
00079         LPC_PINCON->PINMODE0 |= 2U<<4;
00080     }
00081 }