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

Texas Instruments TLV1562 manual 8.5.5

Models: TLV1562

1 99

Page 4

Contents
8.5.5	Dual Continuous Mode	38
8.5.6 C-Callable With Mono Interrupt Driven Mode Using CSTART to Start Conversion		40
8.6 Source Code		41
8.6.1 Common Software for all Modes (except C-Callable)		41
8.6.2 Mono Mode Interrupt Driven Software Using RD to Start Conversion		46
8.6.3 Calibration of the ADC		53
8.6.4 Mono Mode Interrupt Driven Software Using CSTART to Start Conversion		58
8.6.5 Dual Interrupt Driven Mode		66
8.6.6	Mono Continuous Mode	74
8.6.7	Dual Continuous Mode	80
8.6.8	C-Callable	86

9 Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93 10 References . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

ivSLAA040

Page 4

Image 4

Contents

July SLAA040Application Report TParalInteMS3rflelADConvertertotheacing20C54xDSPtheTLV1562IMPORTANT NOTICE Contents 8.5.5 List of Figures List of TablesFigures Interfacing the TLV1562 Parallel AD-Converter to the TMS320C54x DSPviSLAA040 Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 1 Introduction2 The Board 2.1 TMS320C54x Starter Kit2.2 TLV1562EVM 2.3 ADC TLV1562 Overview2.3.1 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 Table 1. Signal Connections 3.3 Connections Between the DSP and the EVM3.3.1 Jumpers Used on the TLV1562EVM Table 2. 3-Position JumpersTable 3. 2-Position Jumpers Operational Overview4 The Serial DAC/DSP System Table 4. DSP/DAC InterconnectionTable 5. DSP Serial Port Signals and Registers 5 The DSP Serial Port6 Other DSP/TLV1562 Signals 6.1 DSP Internal Serial Port Operation7.2 Mono Interrupt Driven Mode Using RD 7 Conversation Between the TLV1562 and the DSP7.1 Writing to the ADC Table 6. DSP Algorithm for Writing to the ADCTable 7. DSP Algorithm for Mono Interrupt Driven Mode Using RD Conversation Between the TLV1562 and the DSPInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP tDCSL-sample+1ADCSYSCLK7.3 Mono Interrupt Driven Mode Using CSTART Table 8. DSP Algorithm for Mono Interrupt Driven Mode Using CSTARTConversation Between the TLV1562 and the DSP 14 SLAA0407.4 Dual Interrupt Driven Mode Table 9. DSP Algorithm for Dual Interrupt Driven ModeConversation Between the TLV1562 and the DSP Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP7.5 Mono Continuous Mode Table 10. DSP Algorithm for Mono Continuous ModeConversation Between the TLV1562 and the DSP 16 SLAA0407.6 Dual Continuous Mode Table 11. DSP Algorithm for 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 8.3.3 Timer Output 8.3 Programming Strategies for the ’C54x, Explanations8.3.1 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 8.3.7 Interrupt Latency 8.3.8 Branch Optimization goto/dgoto, call/dcallGOTO 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 8.4.1.2 Timed Solution 8.4.1.1 Software PollingAdvantage Disadvantage8.4.1.3 Interrupt Driven Solution 8.4.1.5 Setting the Right SwitchesAdvantages DisadvantagesTask Table 12. Switch SettingsTable 13. Instruction in the Program Header Step 8.5 Flow Charts and Comments for All Software Modes 8.5.1 The Mono Interrupt Driven Mode Using RD to Start ConversionTable 14. Instruction in the Program Header Step 8.4.1.6 Common Software for all ModesProgram Files Other 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 8.5.2 Mono Interrupt Driven Mode Using CSTART to Start Conversion Calibration procedure of the DACProgram Files Other FilesSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPInitialize SPI SAVE8.5.2.1 Throughput Optimization† This only works for one TLV1562 not multiple because CS is not used8.5.3 Dual Interrupt Driven Mode Figure 8. Time Optimization monocst1Maximum Performance at 1.2 MSPS with Internal Clock Program FilesIMPORTANT 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 code Code verificationSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP8.5.4 Mono Continuous Mode Program FilesOther Files Code verificationSoftware Overview Figure 10. Flow Chart Mono Continuous ModeInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 8.5.5 Dual Continuous Mode Program FilesOther 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 Source Code 8.6.1 Common Software for all Modes except C-Callable8.6.1.1 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 8.6.1.3 linker,cmd 8.6.1.4 Auto.batFile Linker.lnk COMMAND FILE title ”COMMAND FILE FOR TLV1562.ASM”Mainprogram Monomode.asm pointer address when using any of the following variablesSoftware Overview jump address to init. new channelsent value to register CR0 of the ADC Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP Software Overview if SENDOUTSERIALendif if INT0DRIVENPOLLINGDRV 48 SLAA040endif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP if AUTOPWDNENABLE Software Overviewendif if DIFFINPUTMODE endifelseif NOINT0SIG Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP endif 52 SLAA0408.6.3 Calibration of the ADC CALIBRAT.ASMSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview 54 SLAA040Software Overview endifif SMECALIBRATION Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview 56 SLAA040Software Overview endifendif Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview Mainprogram Monomode.asm58 SLAA040 Software Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPif SENDOUTSERIAL Software Overview60 SLAA040 Software Overview endifif INT0DRIVENPOLLINGDRV endifelseif R4BITRESOLUT Software Overview62 SLAA040 Software Overview if POLLINGDRV= bit*AR5,15-0 elseif INT0DRIVENSoftware Overview if INT0DRIVENendif if SENDOUTPARALLELendif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP 8.6.5 Dual Interrupt Driven Mode Constants definition - see 8.6.1.1 Constants.asmInterrupt Routine handler - see 8.6.1.2 Interrupt Vectors Mainprogram DUALIRQ1.asmSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview if SENDOUTSERIALendif Software OverviewInterfacing the TLV1562 Parallel ADC to the TMS320C54x DSP if AUTOPWDNENABLE Software Overviewif EXTERNALCLOCK endifif AUTOPWDNENABLE Software Overviewendif if POLLINGDRVif AUTOPWDNENABLE Software Overviewendif if INT0DRIVENSoftware Overview endifif SAVEINTOMEMORY endif8.6.6 Mono Continuous Mode Mainprogram MONOCON1.asmConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview if SENDOUTSERIALendif if R8BITRESOLUTSoftware Overview endif if EXTERNALCLOCKendif if DIFFINPUTMODE endifSoftware Overview if SENDOUTPARALLELendif if SAVEINTOMEMORY endif if SENDOUTSERIALSoftware Overview endif if SAVEINTOMEMORYendif Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP8.6.7 Dual Continuous Mode Mainprogram DUALCON1.asmConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview if SENDOUTSERIALendif if R8BITRESOLUTSoftware Overview endif if EXTERNALCLOCKendif if DIFFINPUTMODE endifSoftware Overview if SENDOUTPARALLELendif if SAVEINTOMEMORY endif if SENDOUTSERIALSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSP8.6.8 C-Callable Mainprogram C1562.cConstants definition - see 8.6.1.1 Constants.asm Interrupt Routine handler - see 8.6.1.2 Interrupt VectorsSoftware Overview Interfacing the TLV1562 Parallel ADC to the TMS320C54x DSPSoftware Overview 88 SLAA040Software Overview = bit*AR5,15-0AR7+ = 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 Auto.bat Linker.cmdFile Linker.lnk COMMAND FILE title ”COMMAND FILE FOR TLV1562.ASM”9 Summary 10 References