void SetupADC(void)
{
unsigned int config1;
unsigned int config2;
unsigned int config3;
unsigned int config4;
unsigned int configport_h;
unsigned int configport_l;
unsigned int configscan_h;
unsigned int configscan_l;
// TODO explain these settings
config1 = ADC_MODULE_ON & ADC_IDLE_STOP & ADC_ADDMABM_ORDER & ADC_AD12B_12BIT & ADC_FORMAT_INTG
& ADC_CLK_AUTO & ADC_AUTO_SAMPLING_OFF & ADC_SIMULTANEOUS & ADC_SAMP_OFF;
config2 = ADC_VREF_AVDD_AVSS & ADC_SCAN_OFF & ADC_DMA_ADD_INC_1 & ADC_ALT_BUF_OFF
& ADC_ALT_INPUT_OFF;
config3 = ADC_SAMPLE_TIME_4 & ADC_CONV_CLK_SYSTEM & ADC_CONV_CLK_6Tcy;
config4 = ADC_DMA_BUF_LOC_1;
configport_h = ENABLE_ALL_DIG_16_31;
configport_l = ENABLE_AN0_ANA;
configscan_h = SCAN_ALL_16_31;
configscan_l = SCAN_ALL_0_15;
OpenADC1(config1,config2,config3,config4,configport_l,configport_h, configscan_h,configscan_l);
DisableIntADC1();
}
static void adcSetupPeripheral(void){
unsigned int AD1CON1value, AD1CON2value, AD1CON3value, AD1CON4value,
AD1PCFGHvalue, AD1PCFGLvalue, AD1CSSHvalue, AD1CSSLvalue,
AD1CHS0value, AD1CHS123value;
//Setup:
//ADC1 : Ch0 - AN11 then AN1
// Ch1 - AN0 then AN3
//ADC2 : Left unconfigured for user applications
AD1CON1value = ADC_MODULE_ON & //ADC module is enabled
ADC_IDLE_CONTINUE & // ADC will continue in idle mode
ADC_AD12B_10BIT & // ADC in 10 bit mode
ADC_FORMAT_INTG & // ADC in integer format (CLARIFY)
ADC_CLK_MPWM & // MCPWM interval ends sampling and starts conversion
ADC_SIMULTANEOUS & //Simultaneously sample CH0 and CH1
ADC_ADDMABM_ORDER & //DMA buffers are written in the order of conversion
ADC_AUTO_SAMPLING_ON & //ADC does not need to be triggered manually
ADC_SAMP_ON; //sample / hold amplifiers are sampling (maybe incorrect)
AD1CON2value = ADC_VREF_AVDD_AVSS & //Vref+ = AVdd , Vref- = AVss
ADC_SCAN_OFF & //Do not scan through ADC channels
ADC_SELECT_CHAN_01 & //Sample & convert
ADC_ALT_BUF_OFF & //Use one 16 word buffer
ADC_ALT_INPUT_ON & // Alternate between MUXA and MUXB
ADC_DMA_ADD_INC_2; //Increment DMA address after 2 samples, to account for alt. sampling
AD1CON3value = ADC_CONV_CLK_SYSTEM & //Use System clock, not internal RC osc
ADC_CONV_CLK_3Tcy & //Tad = 3 * Tcy
ADC_SAMPLE_TIME_1; //Sample Time = 1*Tad
AD1CON4value = ADC_DMA_BUF_LOC_4; //This may be wrong (TODO)
AD1CHS123value = ADC_CH123_NEG_SAMPLEA_VREFN & // Sample A, Vref- = AVss
ADC_CH123_POS_SAMPLEA_0_1_2 & // Sample A, CH1=AN0, CH2=AN1, CH3=AN2
ADC_CH123_NEG_SAMPLEB_VREFN & // Sample B, Vref- = AVss
ADC_CH123_POS_SAMPLEB_3_4_5; // Sample B, CH1=AN3, CH2=AN4, CH3=AN5
AD1CHS0value = ADC_CH0_NEG_SAMPLEA_VREFN & // Sample A, Vref- = AVss
ADC_CH0_POS_SAMPLEA_AN11 & // Sample A, CH0 = AN11
ADC_CH0_NEG_SAMPLEB_VREFN & // Sample B, Vref- = AVss
ADC_CH0_POS_SAMPLEB_AN1; // Sample A, CH0 = AN1
AD1CSSHvalue = SCAN_NONE_16_31; //Skip AN16-AN131 for Input Scan
AD1CSSLvalue = SCAN_NONE_0_15; //Skip AN0-AN15 for Input Scan
//Set pins to analog inputs; also check init_default.c
AD1PCFGHvalue = ENABLE_ALL_DIG_16_31; //Shouldn't matter, only AN0-15 on 706A
AD1PCFGLvalue = ENABLE_AN0_ANA & ENABLE_AN1_ANA & ENABLE_AN3_ANA & ENABLE_AN11_ANA;
SetChanADC1(AD1CHS123value, AD1CHS0value);
OpenADC1(AD1CON1value, AD1CON2value, AD1CON3value, AD1CON4value, AD1PCFGLvalue, AD1PCFGHvalue, AD1CSSHvalue, AD1CSSLvalue);
IFS0bits.AD1IF = 0; // Clear the A/D interrupt flag bit
IEC0bits.AD1IE = 0; //Disable A/D interrupt
}
void initAdc1(void)
{
//Using the adc peripheral library, configure ADC1 as follows:
// 12-bit
// sample off of AN0
// Use dedicated ADC RC oscillator
// Automatically start new conversion after previous
// Use Avdd and Avss as reference levels
OpenADC1(
ADC_MODULE_OFF & ADC_AD12B_12BIT & ADC_FORMAT_INTG & ADC_CLK_AUTO & ADC_AUTO_SAMPLING_ON,
ADC_VREF_AVDD_AVSS & ADC_SCAN_OFF,
ADC_SAMPLE_TIME_31 & ADC_CONV_CLK_INTERNAL_RC,
ADC_DMA_BUF_LOC_1,
ENABLE_AN0_ANA,
ENABLE_ALL_DIG_16_31,
0,
0);
AD1CON1bits.ADON = 1; //Turn on ADC
}
