Texas Instruments TMS320C3 Series, User Manual, Page: 54 / 166

TLC32040 AIC Initialization
4-20
Example 4–2.Setting the TA and TB Registers
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
; LOOPAIC.ASM is an example program which shows how to initialize and use
; the TLC32040. The analog output (DAC output) is either a ramp signal
; (RAMPEN=1) or a loopback of the analog input (RAMPEN=0).
;–––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––––
.start ”AICTEST”,0x809802 ; Start assembling here
.sect ”AICTEST” ;
;––––––––––––––––––––––––––––––––––––
; Define constants used by program
;––––––––––––––––––––––––––––––––––––
RAMPEN
.set 1 ; Set to 1 to generate ramp at AOUT
T0_ctrl .set 0x808020 ; TIM0 gl control
T0_count .set 0x808024 ; TIM0 count
T0_prd .set 0x808028 ; TIM0 prd
S0_gctrl .set 0x808040 ; SP 0 global control
S0_xctrl .set 0x808042 ; SP 0 FSX/DX/CLKX port ctl
S0_rctrl .set 0x808043 ; SP 0 FSR/DR/CLKR port ctl
S0_xdata .set 0x808048 ; SP 0 Data transmit
S0_rdata .set 0x80804C ; SP 0 Data receive
TA .set 12 ; AIC timing register values
TB .set 15 ;
RA .set 12 ;
RB .set 15 ;
GIE .set 0x2000 ; This bit in ST turns on interrupts
;––––––––––––––––––––––––––––––––––––
; Define some constant storage data
;––––––––––––––––––––––––––––––––––––
A_REG
.word (TA<<9)+(RA<<2)+0 ; A registers
B_REG .word (TB<<9)+(RB<<2)+2 ; B registers
C_REG .word 10000011b ; control
S0_gctrl_val .word 0x0E970300 ; Serial port control register
; values
S0_xctrl_val .word 0x00000111 ;
S0_rctrl_val .word 0x00000111 ;
RAMP .word 0 ; RAMP count value
ADC_last .word 0 ; Last received ADC value