TMS570LS1224: Code for HET to capture the frequency

Hello Jordan,

NHET has the capability to measure the period, duty cycle, and frequency of the incoming signals.

For input pulse period measurement, I recommend  to use PCNT instruction

; Input Pulse/Period measurements with PCNT

;  Set HRSHARE register bit 0 to measure RISE2FALL and RISE2RISE from input signal on pin 0

; If HRSHARE bits are not set, then the defined pulse/period type will be measured on the

; 4 individual pins as defined below

L00   PCNT { type=RISE2FALL, pin=0};

L01   PCNT { type=RISE2RISE, pin=1};

L02   BR { next=L00,cond_addr=L00,event=NOCOND};

The L00 instruction measures the time from rising edge to falling edge. L00 measures the period between rising edge and next rising edge. The frequency can be calculated from the period.