Guidelines for the ADS1256 Example Project for the TMS320VC5500 DSP family

Table of Contents

3.1 Development Environment
3.2 Project Directory
3.3 DCP Settings
3.4 Application Settings
3.5 Code Composer Studio Settings
3.6 Exposed Functions
3.7 Additional Notes

1. Legal Notes

2. Hardware Settings

Converter Board

General Information

Name	: ADS1256 EVM
Partnumber	: ADS1256EVM
Revision	: B
Literature Number	: SBAU090
Vendor	: Texas Instruments

Jumper Settings

Designator	Position
J4	1-2 closed
J4	3-4 closed
J4	5-6 open
J4	7-8 closed
J4	9-10 closed
J4	11-12 closed

Switch Settings

Designator	Position
S1	left (EXT)
S2	left (EXT)
S3	middle (OBH)
S5	left (XTAL)

External Signal Connections

- frequency	: 100Hz
- vpp	: 4.5Vpp
- voff	: 0V
- connector	: J1 pin 1 and 2
- type	: sinewave

Other Board Modifications

Connect RESET to Vcc

Connect J3 pin 9 (+3.3V) to J2 pin 14 (RESET)

Connect SYNC / PWDWN to Vcc

Connect J3 pin 9 to J2 pin 19 (SYNC / PWDWN)

Interface Board

General Information

Name	: 5-6K Interface Card
Partnumber	: 5-6KINTERFACE
Revision	: B
Literature Number	: SLAU104B
Vendor	: Texas Instruments

Jumper Settings

Designator	Position
W1	open
W2	2-3
W3	2-3
W4	2-3
W5	2-3
W6	1-2
W7	2-3
W8	1-2
W9	1-2
W10	2-3
W11	1-2
W12	open
W13	1-2
J13	INTb
J14	TOUTb

Switch Settings

Designator	Position
SW1	all OFF (left position)
SW2	all OFF (left position)

Power Connections

- connector	: J2
- voltage	: +5V
- signal	: +5VA

DSP Board

General Information

Name	: TMS320VC5509A DSP Starter Kit (DSK)
Partnumber	: TMDSDSK5509
Revision	: C
Literature Number	:
Vendor	: Spectrum Digital Inc.

Switch Settings

Designator	Position
S3.1	OFF
S3.2	OFF
S3.3	OFF
S3.4	on

Power Connections

- connector	: J5
- voltage	: +5V

Additional Hardware Notes

None.

3. Software

3.1 Development Environment

3.2 Project Directory

Project Directory Name: ADS1256-C5509A-CCS3v1

- [DEBUG] - ADS1256-C5509A-CCS3v1.map - ADS1256-C5509A-CCS3v1.out - ADS1256-C5509A-CCS3v1.cdb - ADS1256-C5509A-CCS3v1.pjt - ADS1256-C5509A-CCS3v1cfg.cmd - ADS1256-C5509A-CCS3v1cfg.h - ADS1256-C5509A-CCS3v1cfg.s55 - ADS1256-C5509A-CCS3v1cfg_c.c - dc_conf.h - main.c - t1256_fn.h - 1256_ob.c - tidc_api.c - tidc_api.h

Map-file Executable DSP/BIOS configuration file CCS project file linker command file DSP/BIOS configuration header file DSP/BIOS assembly file DSP/BIOS c-source file data converter settings example source code interface software header file interface software source file interface software API source file interface software API header file

3.3 DCP Settings

DSP Tab Settings

- DSP-Type	: TMS320C5509A
- DSP Clock	: 200 MHz

Converter Tab Settings

- Clock Csource	: Generator
- Input CLock	: 7.68 MHz
- Data Rate	: 30000.000 SPS
- CLOCKOUT	: 7.68 MHz
- Serial Port	: McBSP1
- Interrupt	: Ext Int 1
- DMA Channel	: Channel 2
- Positive Channel	: AIN0
- Negative Channel	: AIN1
- D1 Direction	: Input
- D2 Direction	: Input
- D3 Direction	: Input
- Programmable Gain Amplifier	: 1
- Sensor Detect Current	: Off
- Buffer Enable	: Unchecked
- Auto-Calibration on	: Unchecked

3.4 Application Settings

Sample Buffer

- Name	: r_buffer1
- Size	: 1024
- DataType	: long
- Name	: r_buffer2
- Size	: 1024
- DataType	: long

3.5 Code Composer Studio Settings

How To Display Data Samples

1. Setting a probe-point at the dc_readblock(); line in the main routine

2. Connect this probe-point to a graph-window with the settings below


Parameter for the Graph Window(s):

Graph Window 1:

- Start Address	: r_buffer1
- Acquisition Buffer Size	: 1024
- Display Data Size	: 1024
- DSP Data Type	: 32-bit signed integer
- Sampling Rate (Hz)	: 30000

3.6 Exposed Functions

ADS1256_rblockFinished();()

Description:
- Interrupt service routine. Is called once a buffer is filled and ready for processing. This ISR calls the callback-function callback(void *pDC), which can be used to provide a handshake with the application.


Return Value:
- : void


Parameter:

-

: None

ADS1256_getFinishedBufferAddress();()

Description:
- Returns the address of the finished buffer. Can only be called from inside the callback-function.


Return Value:
- unsigned long: Address of the finished buffer


Parameter:

- TADS1256

*pADS

: Data converter object

ADS1256_getFinishedBufferSize();()

Description:
- Returns the size of the finsihed buffer. Can only be called from inside the callback-function.


Return Value:
- unsigned int: Size of the finished buffer


Parameter:

- TADS1256

*pADS

: Data converter object

3.7 Additional Notes

Connection of the ADS1256 EVM to the 5/6k EVM

The example project uses McBSP1 of the DSP. Therefore, the ADS1256 EVM needs to be connected to J15 of the 5-6K interface board (i.e. it used the "Serial B" site of the board.

Number of possible buffers

Only two buffers can be active at a time: One is submitted and currently in progress, the other one is submitted and waiting. This allows for continuous tranfers. If the user attempts to submit a third buffer, the function dc_readblock() will return with an error.