SigLib FSk Function: SDA_FskModulate I would like to implement the example code from SigLib's example "fsk.c".
The defines are below


#define SAMPLE_LENGTH                   ((SLArrayIndex_t)512)

#define NUMBER_OF_LOOPS                 4L

#define SAMPLE_RATE                     9600.0

#define BAUD_RATE                       1200.0
/* Number of samples per symbol */

#define SYMBOL_LENGTH                   ((SLArrayIndex_t)(SAMPLE_RATE / BAUD_RATE)) 

#define MAX_RX_STRING_LENGTH            ((SLArrayIndex_t)80)   
/* Frequency of sine wave in table */

#define CARRIER_TABLE_FREQ              ((SLData_t)100.0)       
/* Number of samples in each of cos and sine table */

#define CARRIER_SINE_TABLE_SIZE  ((SLArrayIndex_t)(SAMPLE_RATE / CARRIER_TABLE_FREQ))     
/* Must be an integer number of cycles */
/* Rx Filter length */

#define RX_FILTER_LENGTH    ((SLArrayIndex_t)((2 * SYMBOL_LENGTH) + 1)) 
/* Low carrier frequency */

#define FREQ_1300_HZ                    1300.0
/* High carrier frequency */

#define FREQ_2100_HZ                    2100.0
/* Carrier frequency for '0' */

#define CARRIER_FREQ_ZERO               FREQ_2100_HZ
/* Carrier frequency for '1' */

#define CARRIER_FREQ_ONE                FREQ_1300_HZ
/* Bandwidth of detection filter */

#define FILTER_BANDWIDTH                400.0


The initialization call to the function is this:

`SIF_FskModulate (pCarrierTable, (CARRIER_TABLE_FREQ / SAMPLE_RATE), CARRIER_SINE_TABLE_SIZE);`


In the code, the second parameter: (CARRIER_TABLE_FREQ / SAMPLE_RATE) is commented with:
/* Carrier frequency */

This number works out to a fractional amount - 100.0/9600 = small. How is this used? What would the FSK carrier be set to, or is that determined by the rate at which you load the pData array into the DAC? 

Can someone clarify what that means in terms of using this code? 

Thank you!
The comment is mistaken.  The carrier frequency is 100 Hz.  The sample rate is 9600 Hz.  The carrier frequency divided by the sample rate is the carrier phase increment (phase change per sample), not the carrier frequency.  The units are radians / $2\pi$ (i.e. the phase increment is normalized from 0 to 1, not 0 to $2\pi$).  That phase increment can be used to index into a sine table to create a sinusoid.