Texas Instruments TLV1562 - Manual (Page 41)

Software Overview
35 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP
Start
Initialize DSP
Wait States, AR Pointer, IRQ Table, Data Memory, Serial Port
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
H/L Transition on INTO ?
1
No
Yes
INTO (External Interrupt)
Save Modified Register of
The IRQ Routine, if Not
Automatically Saved by The
DSP
(Not Required)
1
IME CALABRATION = 1
Calibrate Internal Midscale Error IME CALABRATION = 0
SME CALABRATION = 1
Calibrate System Midscale Error IME CALABRATION = 0
Start Sampling
Pull Down CSTART
Wait 100 ns
Stop Sampling and Start Conversion
Reset CSTART (Set Back High)
Table End Reached?
(AR7 = AR0 ?)
POLLING_DRIVEN = 1
Wait Until End of Conversion
Poll INTO Pin Until h/0 Transition Occurs
INTO_DRINEN = 1
Main Program
Stay in Idle Mode
NO_INTO_SIGNAL = 1
Wait Until End of Conversion
Wait For a Certain Time
1
INTO
2
SEND_OUT_PARALLEL = 1
SEND_OUT_PARALLEL = 0 Copy Last Sample to Parallel DAC
SEND_OUT_SERIAL = 1
SEND_OUT_SERIAL = 0
Copy Last Sample to Serial DAC
if Send Register is Empty
SAVE_INTO_MEMORY = 0
SAVE_INTO_MEMORY = 1
Store Sample Into Memory
Save Sample to AR7 – Pointed Location
Yes
No
Reset Actual Memory Pointer
AR7/7= First Memory Store Location
AR7 = Data_Loc_A; AR6 = Data_Loc_B
Start New Sampling
Pull Down CSTART
Read Both Samples
Stop Sampling and Start Conversion
Reset CSTART (Set Back High)
Figure 9. Flow Chart Dual Interrupt Driven Mode (Using CSTART) to Start Conversion