CCS C Compiler Manual PCB / PCM / PCH

Built-in Functions
· ADC_START_ONLY (starts conversion and returns)
· ADC_READ_ONLY(reads conversion result)
result – Pointer to return ADC conversion too. Parameter is optional, if
not used the read_fast_adc() function can only perform a start.
Returns:
Undefined
This function is used to start an analog to digital conversion
and/or read the digital value when the conversion is complete.
Calls to setup_high_speed_adc() and
setup_high_speed_adc_pairs() should be made sometime
before this function is called.
When using this function to perform an individual start and
read or individual start only, the function assumes that the
pair's trigger source was set to
INDIVIDUAL_SOFTWARE_TRIGGER.
Function:
When using this function to perform a global start and read,
global start only, or global read only. The function will perform
the following steps:
1. Determine which ADC pairs are set for
GLOBAL_SOFTWARE_TRIGGER.
2. Clear the corresponding ready flags (if doing a
start).
3. Set the global software trigger (if doing a start).
4. Read the corresponding ADC pairs in order
from lowest to highest (if doing a read).
5. Clear the corresponding ready flags (if doing a
read).
When using this function to perform a individual read only.
The function can read the ADC result from any trigger
source.
Availability:
Requires:
Examples:
Only on dsPIC33FJxxGSxxx devices.
Constants are define in the device .h file.
//Individual start and read
int16 result[2];
setup_high_speed_adc(ADC_CLOCK_DIV_4);
setup_high_speed_adc_pair(0, INDIVIDUAL_SOFTWARE_TRIGGER);
read_high_speed_adc(0, result); //starts conversion for AN0 and AN1 and
stores
//result in result[0] and result[1]
//Global start and read
int16 result[4];
setup_high_speed_adc(ADC_CLOCK_DIV_4);
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