ADC (Analog to Digital Converter) module is available with a number of PIC MCU modules. ADC is an electronic circuit that converts continuous signals to discrete digital numbers. ADC Library provides you a comfortable work with the module.
Library Routines
ADC_Init
| Prototype | void ADC_Init(); |
|---|---|
| Returns | Nothing. |
| Description | This routine initializes PIC’s internal ADC module to work with RC clock. Clock determines the time period necessary for performing AD conversion (min 12TAD). |
| Requires |
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| Example |
ADC_Init(); // Initialize ADC module with default settings |
ADC_Get_Sample
| Prototype | unsigned ADC_Get_Sample(unsigned short channel); |
|---|---|
| Returns | 10 or 12-bit unsigned value read from the specified channel (MCU dependent). |
| Description | The function aquires analog value from the specified channel. Parameter channel represents the channel from which the analog value is to be acquired. Refer to the appropriate datasheet for channel-to-pin mapping.
 Note : This function doesn’t work with the external voltage reference source, only with the internal voltage reference. |
| Requires |
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| Example |
unsigned adc_value; ... adc_value = ADC_Get_Sample(2); // read analog value from ADC module channel 2 |
ADC_Read
| Prototype | unsigned ADC_Read(unsigned short channel); |
|---|---|
| Returns | 10 or 12-bit unsigned value read from the specified channel (MCU dependent). |
| Description | Initializes PIC’s internal ADC module to work with RC clock. Clock determines the time period necessary for performing AD conversion (min 12TAD). Parameter channel represents the channel from which the analog value is to be acquired. Refer to the appropriate datasheet for channel-to-pin mapping.
Note : This function doesn’t work with the external voltage reference source, only with the internal voltage reference. |
| Requires |
|
| Example |
unsigned tmp; ... tmp = ADC_Read(2); // Read analog value from channel 2 |
For more detail: Connect ADC with PIC16F877
