TMS320C5x DSP STARTER KIT USER'S GUIDE

Getting Started3.4 Getting StartedExample 3–1. Source File try1.asmThis section provides a quick walkthrough so that you can get started withoutreading the entire user’s guide. These examples show the most commonmethods for invoking the assembler and debugger.1) Create a short source file to use for the walkthrough; call it try1.asm.******************************************************************************** Saw–toothed Wave Generator ** Ramp rate is determined by interrupt rate and step size. Ramp is made by ** numerical rollover. No AIC initialization, using the default value. ********************************************************************************; Declare memory–mapped registers and; program block address.mmregs; Include memory map reg.ps 0080ch ;B XINT ; Set transmit interrupt vector.ps 00a00h ;.entry; Initial PC addressLDP #0 ; Load Data Page for DXR (Zero)CALL SP_init ; Call serial port initialize functionLAMM IMR ;OR #20h ; Unmask receive interrupt (XINT)SAMM IMR ;SPLK #0ffffh, IFR; Clear pending interruptLOOP: ADD #10 ; Increment ACCU by 10SACL DXR,3 ; Shift ACCU left 3 bits when storingIDLE; Wait for D/A interruptB LOOP ;XINT: RETE ; Reenable interruptsSP_init:SPLK #01h,PRD ; Generate 10 MHz clock from TOUT toSPLK #20h,TCR ; support AIC master clockMAR *,AR0 ;LACC #0080h ; Set 00000080h => ACCSACH DXR ; Clear DXRSACL GREG ; Set GREG = 80h, >8000h memory = GlobalLAR AR0,#0FFFFh ; AR0 point to global memoryRPT #9999 ; Bring the BR low for 10000 cyclesLACC *,0,AR0 ; (.5ms at 50ns)SACH GREG ; Disable global memoryLACC #0008h ; Put serial port in reset and configure asSACL SPC ; burst mode, FSX input, and data length 16 bitsLACC #80c8h ;SACL SPC ; Bring the serial port out of resetRETOverview of a Code Development and Debugging System3-5