Manuals / Texas Instruments / TV and Video / TV Converter Box

Texas Instruments TLV1562 manual July, SLAA040, Application Report, Advanced Analog Products

Models: TLV1562

1 99

Download 99 pages 55.38 Kb

Page 1

Image 1

TParalInteMS3rflelADConvertertotheacing20C54xDSPtheTLV1562

Application

Report

July 1999

Advanced Analog Products

SLAA040

Page 1

Image 1

Texas Instruments TLV1562 manual July, SLAA040, Application Report, Advanced Analog Products

Contents

SLAA040 JulyApplication Report TParalInteMS3rflelADConvertertotheacing20C54xDSPtheTLV1562IMPORTANT NOTICE Contents 8.5.5 List of Tables List of FiguresFigures Interfacing the TLV1562 Parallel AD-Converter to the TMS320C54x DSPviSLAA040 1 Introduction Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP2 The Board 2.1 TMS320C54x Starter Kit2.3 ADC TLV1562 Overview 2.2 TLV1562EVM2.3.1 Suggestions for the ’C54x to TLV1562 Interface 2.3.1.1 The Universal Interface2.3.2 Recyclic Architecture Using RD or the CSTART Signal to Start ConversionFigure 2. TLV1562 to ’C54x DSP Interface of the EVM 2.4 Onboard Components 2.3.3 Note on the Interface, Using an External ADC Clock Drive2.4.1 TLC5618A - Serial DAC Figure 3. TLC5618A to ’C542 DSP Interface 2.4.2 THS5651 - Parallel Output CommsDACFigure 4. THS5651 to C542 DSP Interface 3.1 Reference Voltage Inputs 3 Operational Overview3.2 Input Data Bits 3.3 Connections Between the DSP and the EVM Table 1. Signal ConnectionsTable 2. 3-Position Jumpers 3.3.1 Jumpers Used on the TLV1562EVMTable 3. 2-Position Jumpers Operational OverviewTable 4. DSP/DAC Interconnection 4 The Serial DAC/DSP System5 The DSP Serial Port Table 5. DSP Serial Port Signals and Registers6.1 DSP Internal Serial Port Operation 6 Other DSP/TLV1562 Signals7 Conversation Between the TLV1562 and the DSP 7.2 Mono Interrupt Driven Mode Using RD7.1 Writing to the ADC Table 6. DSP Algorithm for Writing to the ADCConversation Between the TLV1562 and the DSP Table 7. DSP Algorithm for Mono Interrupt Driven Mode Using RDInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP tDCSL-sample+1ADCSYSCLKTable 8. DSP Algorithm for Mono Interrupt Driven Mode Using CSTART 7.3 Mono Interrupt Driven Mode Using CSTARTConversation Between the TLV1562 and the DSP 14 SLAA040Table 9. DSP Algorithm for Dual Interrupt Driven Mode 7.4 Dual Interrupt Driven ModeConversation Between the TLV1562 and the DSP Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPTable 10. DSP Algorithm for Mono Continuous Mode 7.5 Mono Continuous ModeConversation Between the TLV1562 and the DSP 16 SLAA040Table 11. DSP Algorithm for Dual Continuous Mode 7.6 Dual Continuous ModeConversation Between the TLV1562 and the DSP Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP8.1 Software Development tools 8 Software Overview8.2 DSP Memory Map Software Overview Figure 5. Memory MapInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 8.3 Programming Strategies for the ’C54x, Explanations 8.3.3 Timer Output8.3.1 Optimizing CPU Resources for Maximum Data Rates 8.3.2 Address and Data Bus for I/O Tasks8.3.4 Data Page Pointer 8.3.5 Generating the Chip Select Signal and the CSTART Signal8.3.6 Interfacing the Serial DAC 5618A to the DSP 8.3.8 Branch Optimization goto/dgoto, call/dcall 8.3.7 Interrupt LatencyGOTO MARK MARK DP = #1 ARP = #58.4 Software Code Explanation 8.3.9 Enabling Software Modules .if/.elseif/.endif8.4.1 Software Principals of the Interface 8.4.1.1 Software Polling 8.4.1.2 Timed SolutionAdvantage Disadvantage8.4.1.4 Enabling One Software Mode 8.4.1.3 Interrupt Driven Solution8.4.1.5 Setting the Right Switches AdvantagesTask Table 12. Switch SettingsTable 13. Instruction in the Program Header Step 8.5.1 The Mono Interrupt Driven Mode Using RD to Start Conversion 8.5 Flow Charts and Comments for All Software ModesTable 14. Instruction in the Program Header Step 8.4.1.6 Common Software for all ModesOther Files Program FilesCode verification common file of all modes constants definitionSoftware Overview Figure 6. Software Flow of the Mono Interrupt Driven SolutionInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Calibration procedure of the DAC 8.5.2 Mono Interrupt Driven Mode Using CSTART to Start ConversionProgram Files Other FilesInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software OverviewInitialize SPI SAVEThis only works for one TLV1562 not multiple because CS is not used 8.5.2.1 Throughput Optimization†Figure 8. Time Optimization monocst1 8.5.3 Dual Interrupt Driven ModeMaximum Performance at 1.2 MSPS with Internal Clock Program FilesCode verification IMPORTANT NOTE The code has been optimized to maximize the data throughput. It was found that CSTART can be pulled low earlier than the data read instruction is performed by the DSP. This saves the 100-ns wait time in STEP 3 because the data read requires at least 100 ns. Therefore, CSTART gets pulled high directly after data read, and the interface becomes faster and gains throughput. This variation will be found in the code. The data acquisition is done in a small number of steps that explains everything inside the codeInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software OverviewProgram Files 8.5.4 Mono Continuous ModeOther Files Code verificationSoftware Overview Figure 10. Flow Chart Mono Continuous ModeInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Program Files 8.5.5 Dual Continuous ModeOther Files Code verificationSoftware Overview Figure 11. Flow Chart Dual Continuous ModeInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Other Files Program FilesCode verification 8.6.1 Common Software for all Modes except C-Callable 8.6 Source Code8.6.1.1 Constants.asm Software Overviewset 000C0h Operate without calibrated inputs no offset Software Overview42 SLAA040 Software Overview 8.6.1.2 Interrupt VectorsInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overview 4C internal timer interrupt44 SLAA040 8.6.1.4 Auto.bat 8.6.1.3 linker,cmdFile Linker.lnk COMMAND FILE title ”COMMAND FILE FOR TLV1562.ASM”pointer address when using any of the following variables Mainprogram Monomode.asmSoftware Overview jump address to init. new channelsent value to register CR0 of the ADC Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP if SENDOUTSERIAL Software Overviewendif if INT0DRIVENPOLLINGDRV 48 SLAA040endif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overview if AUTOPWDNENABLEendif if DIFFINPUTMODE endifelseif NOINT0SIG Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 52 SLAA040 endifCALIBRAT.ASM 8.6.3 Calibration of the ADCSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP54 SLAA040 Software Overviewendif Software Overviewif SMECALIBRATION Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP56 SLAA040 Software Overviewendif Software Overviewendif Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview Mainprogram Monomode.asm58 SLAA040 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overviewif SENDOUTSERIAL Software Overview60 SLAA040 endif Software Overviewif INT0DRIVENPOLLINGDRV endifelseif R4BITRESOLUT Software Overview62 SLAA040 if POLLINGDRV Software Overview= bit*AR5,15-0 elseif INT0DRIVENif INT0DRIVEN Software Overviewendif if SENDOUTPARALLELendif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Constants definition - see 8.6.1.1 Constants.asm 8.6.5 Dual Interrupt Driven ModeInterrupt Routine handler - see 8.6.1.2 Interrupt Vectors Mainprogram DUALIRQ1.asmInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overviewif SENDOUTSERIAL Software Overviewendif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overview if AUTOPWDNENABLEif EXTERNALCLOCK endifSoftware Overview if AUTOPWDNENABLEendif if POLLINGDRVSoftware Overview if AUTOPWDNENABLEendif if INT0DRIVENendif Software Overviewif SAVEINTOMEMORY endifMainprogram MONOCON1.asm 8.6.6 Mono Continuous ModeConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overviewif SENDOUTSERIAL Software Overviewendif if R8BITRESOLUTendif if EXTERNALCLOCK Software Overviewendif if DIFFINPUTMODE endifif SENDOUTPARALLEL Software Overviewendif if SAVEINTOMEMORY endif if SENDOUTSERIALendif if SAVEINTOMEMORY Software Overviewendif Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPMainprogram DUALCON1.asm 8.6.7 Dual Continuous ModeConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overviewif SENDOUTSERIAL Software Overviewendif if R8BITRESOLUTendif if EXTERNALCLOCK Software Overviewendif if DIFFINPUTMODE endifif SENDOUTPARALLEL Software Overviewendif if SAVEINTOMEMORY endif if SENDOUTSERIALInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software OverviewMainprogram C1562.c 8.6.8 C-CallableConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overview88 SLAA040 Software Overview= bit*AR5,15-0 Software OverviewAR7+ = data@ADSAMPLE Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview Vectors.asm90 SLAA040 Software Overview int2 returnenable 48 external interrupt int2 nopInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Linker.cmd Auto.batFile Linker.lnk COMMAND FILE title ”COMMAND FILE FOR TLV1562.ASM”10 References 9 Summary