diff options
Diffstat (limited to 'adc.c')
| -rw-r--r-- | adc.c | 33 |
1 files changed, 23 insertions, 10 deletions
@@ -1,14 +1,27 @@ #include "adc.h" -unsigned int Adc_Read(unsigned int channel) { - ADFM = 1; // results right justified - ADCS0 = 1; //conversion speed = 64*Tosc +/* ADCON0: bit 7 - bit 0 (11-1 pg 111) + * ADCS1:ADCS0:CHS2:CHS1:CHS0:GO/DONE:-:ADON + * + * ADCON1: bit 7 - bit 0 + * ADFM:-:-:-:PCFG3:PCFG2:PCFG1:PCFG0 + */ + +void Adc_Init(void) { + ADCON0 = 0x00; // A/D Off, GO_DONE not in progress, Channel 0, Fosc/2 + ADCS0 = 0; // A/D Conversion Fosc/32 ADCS1:ADCS0 (0b10) (Table 11-1) ADCS1 = 1; - ADCS2 = 1; - ADCON0bits.CHS = channel; - ADON = 1; // Turn on ADC - __delay_ms(1); - GO_DONE = 1; - while (ADCON0bits.GO_DONE == 1); - return ((ADRESH << 8) + ADRESL); // ex 1024 + + //ADCON1 + ADFM = 1; // results right justified + PCFG0 = PCFG1 = PCFG2 = PCFG3 = 0; // AN0-AN7 Analog input, Vref+/- Vdd/Vss +} + +unsigned int Adc_Read(unsigned int channel) { + ADCON0bits.CHS = channel; // Set CHS bits for channel (pg111) + ADCON0bits.ADON = 1; // Turn on ADC + __delay_us(5); // Enough time for A/D acquisition + ADCON0bits.GO_DONE = 1; // A/D Conversion bit set 1 (conversion in progress) + while (ADCON0bits.GO_DONE == 1); // Wait for conversion to finish + return ((ADRESH << 8) + ADRESL); // return combined 10 bits of conversion }
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