tms470r1b1m_het_pcnt_01_h.het

来自「TMS-FET470B1M C Examples」· HET 代码 · 共 37 行

;******************************************************************************
;  TMS470 Demo -  HET PCNT Sample Program
;
;  Program name : tms470r1b1m_HET_PCNT_01_H.het, associated with
;                 tms470r1b1m_HET_PCNT_01.c
;
;  This program uses the PCNT instruction to determine the width of a pulse.
;  The pulse is generated by the HET on HET1 (CC1) and read back into the HET on
;  HET0 (CC0).
;  When the pulse width is valid the HET will trigger an interrupt.
;  At this point the data may be viewed. Pins HET0 (CC0) and HET1 (CC1) must be
;  connected together. You may use the jumpers to connect these two
;  pins together.
;
;  J.Mangino / A.Dannenberg
;  Texas Instruments, Inc
;  July 29th 2005
;  Built with IAR Embedded Workbench Version: 4.30A
;*******************************************************************************

; Implement a counter that uses register A and rolls over at 0x4000
L00: CNT  {next=L01, reg=A, irq=OFF, max=0x4000, data=0}

; Create a pulse starting at count 0x1000
L01: ECMP {next=L02, reg=A, hr_lr=LOW, en_pin_action=ON, pin=CC1, action=SET,
           irq=Off, data=0x1000}

; Reset the pulse at 0x3000
L02: ECMP {next=L03, reg=A, hr_lr=LOW, en_pin_action=ON, pin=CC1, action=CLEAR,
           irq=Off, data=0x3000}

; Get the pulse count value and trigger an interrupt
L03: PCNT {next=L04, irq=ON, type=RISE2FALL, pin=CC0}
L04: BR	  {next=L00, cond_addr=L00, event=NOCOND}