Texas Instruments TLV1562 Software Flow of the Mono Interrupt Driven Solution, Software Overview

Software Overview

Start

1

Initialize DSP

Wait States, AR Pointer, IRQ Table, Data Memory, Serial Port

No

H/L Transition on INTO ?

Yes

INTO (External Interrupt)

Save Modified Register of

The IRQ Routine, if Not

Automatically Saved by The

DSP

(Not Required)

1

Initialize SPI

Active Transmitter, Use Frame Sync,

Generate External Clock

SAVE_INTO_MEMORY = 1

SAVE_INTO_MEMORY = 0

Initialize DSP Memory For Sample Store AR7 Points to The First Store Location AR0 Points to The Table End

ADCOUNT = Table Size (Number of Samples)

Initialize (Id) The Two ADC Registers

CR0 = CR0_SEND

CR1 = CR1_SEND

Start First Conversion

INTO_DRINEN = 1	POLLING_DRIVEN = 1	NO_INTO_SIGNAL = 1
Main Program	Wait Until End of Conversion	Wait Until End of Conversion
Stay in Idle Mode	Poll INTO Pin Until h/0 Transition Occurs	Wait For a Certain Time
1
INTO
	2
		SAVE_INTO_MEMORY = 0
	Read Sample
SEND_OUT_PARALLEL = 1		Store Sample Into Memory
		Save Sample to AR7 – Pointed Location
Copy Last Sample to Parallel DAC	SEND_OUT_PARALLEL = 1
	Start New Conversion	Table End Reached?	No
		(AR& = AR0 ?)
SEND_OUT_SERIAL = 1		Yes
Copy Last Sample to Serial DAC	SEND_OUT_SERIAL = 0	Reset Actual Memory Pointer
if Send Register is Empty
		AR& = First Memory Store Location
	SAVE_INTO_MEMORY = 0

Figure 6. Software Flow of the Mono Interrupt Driven Solution

Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 29