00001
00002
00003
00004
00005
00006
00007
00008
00009
00010
00011
00012
00013
00014
00015
00016
00017
00018
00019
00020
00021
00022
00023
00024
00025
00026
00027
00028
00029
00030 #include "pic24_all.h"
00031 #include "stdio.h"
00032
00033 #ifdef _DMA0IF
00034 #error "This processor selection has the DMA module; this code example is incompatible with a PIC24 CPU that has DMA."
00035
00036 #endif
00037
00038 #define CONFIG_LED2() CONFIG_RB0_AS_DIG_OUTPUT()
00039 #define LED2 _LATB0
00040
00041
00042 #define USE_12BIT_ADC
00043
00044 #ifdef USE_12BIT_ADC
00045 #define ADC_LEN 12
00046 #define ADC_NSTEPS 4096
00047 #define ADC_12BIT_FLAG 1
00048 #else
00049 #define ADC_LEN 10
00050 #define ADC_NSTEPS 1024
00051 #define ADC_12BIT_FLAG 0
00052 #endif
00053
00054 volatile uint16 au16_buffer[16];
00055 volatile uint8 u8_waiting;
00056
00057
00058
00059
00060
00061
00062 void _ISR _ADC1Interrupt (void) {
00063 uint8 u8_i;
00064 uint16* au16_adcHWBuff = (uint16*) &ADC1BUF0;
00065
00066
00067
00068
00069
00070 if (AD1CON2bits.BUFS) {
00071 for ( u8_i=0; u8_i<8; u8_i++) {
00072 au16_buffer[u8_i] = au16_adcHWBuff[u8_i];
00073 }
00074 } else {
00075 for ( u8_i=8; u8_i<16; u8_i++) {
00076 au16_buffer[u8_i] = au16_adcHWBuff[u8_i];
00077 }
00078 }
00079
00080 AD1CON1bits.DONE = 0;
00081 u8_waiting = 0;
00082 _AD1IF = 0;
00083
00084
00085 LED2 = !LED2;
00086 }
00087
00100 int main (void) {
00101 uint8 u8_i;
00102 uint16 u16_pot;
00103 float f_pot;
00104
00105 configBasic(HELLO_MSG);
00106
00107
00108
00109 CONFIG_AN0_AS_ANALOG();
00110 CONFIG_AN1_AS_ANALOG();
00111 CONFIG_AN4_AS_ANALOG();
00112 CONFIG_AN5_AS_ANALOG();
00113 CONFIG_AN10_AS_ANALOG();
00114 CONFIG_AN11_AS_ANALOG();
00115 CONFIG_AN12_AS_ANALOG();
00116
00117 CONFIG_LED2();
00118
00119 configADC1_AutoHalfScanIrqCH0(ADC_SCAN_AN0 | ADC_SCAN_AN1 | ADC_SCAN_AN4 | \
00120 ADC_SCAN_AN5 | ADC_SCAN_AN10 | ADC_SCAN_AN11 | ADC_SCAN_AN12, \
00121 31, ADC_12BIT_FLAG);
00122
00123
00124 while ( !AD1CON1bits.DONE) {};
00125
00126 while (1) {
00127 while(u8_waiting) {};
00128 u8_waiting = 1;
00129 for ( u8_i=0; u8_i<16; u8_i++) {
00130 u16_pot = au16_buffer[u8_i];
00131 f_pot = 3.3 / ADC_NSTEPS * u16_pot;
00132 printf("r");
00133 if (u8_i < 10)
00134 outChar( '0'+u8_i );
00135 else
00136 outChar( 'A'-10+u8_i );
00137 printf(":0x%04X=%1.3fV ", u16_pot, (double) f_pot );
00138 if ((u8_i % 4) == 3) printf("\n");
00139 }
00140 printf("\n");
00141
00142 doHeartbeat();
00143 DELAY_MS(1500);
00144
00145 }
00146 }
00147