SPRUJ71 august   2023

 

  1.   1
  2.   C2000 F28P65x Series LaunchPad Development Kit
  3.   Trademarks
  4. 1Board Overview
    1. 1.1 Kit Contents
    2. 1.2 Features
    3. 1.3 Specifications
      1. 1.3.1 External Power Supply or Accessory Requirements
    4. 1.4 Using the F28P65x LaunchPad
    5. 1.5 BoosterPacks
    6. 1.6 Hardware Revisions
      1. 1.6.1 Revision A
  5. 2Software Development
    1. 2.1 Software Tools and Packages
    2. 2.2 F28P65x LaunchPad Demo Program
    3. 2.3 Programming and Running Other Software on the F28P65x LaunchPad
  6. 3Hardware Description
    1. 3.1 Functional Description and Connections
      1. 3.1.1  Microcontroller
      2. 3.1.2  Power Domains
      3. 3.1.3  LEDs
      4. 3.1.4  Encoder Connectors
      5. 3.1.5  FSI
      6. 3.1.6  CAN
      7. 3.1.7  EtherCAT
      8. 3.1.8  CLB
      9. 3.1.9  Boot Modes
      10. 3.1.10 BoosterPack Sites
      11. 3.1.11 Analog Voltage Reference
      12. 3.1.12 Differential ADC Header
      13. 3.1.13 Other Headers and Jumpers
        1. 3.1.13.1 XDS Isolation Block
        2. 3.1.13.2 BoosterPack Site 2 Power Isolation
        3. 3.1.13.3 Alternate Power
    2. 3.2 Debug Interface
      1. 3.2.1 XDS110 Debug Probe
      2. 3.2.2 XDS110 Output
      3. 3.2.3 Virtual COM Port
    3. 3.3 Alternate Routing
      1. 3.3.1 Overview
      2. 3.3.2 UART Routing
      3. 3.3.3 EQEP Routing
      4. 3.3.4 CAN Routing
      5. 3.3.5 FSI Routing
      6. 3.3.6 PWM DAC
  7. 4Board Design
    1. 4.1 Schematic
    2. 4.2 PCB Layout
    3. 4.3 BOM
    4. 4.4 LAUNCHXL-F28P65X Board Dimensions
  8. 5Frequently Asked Questions
  9. 6References
    1. 6.1 Reference Documents
    2. 6.2 Other TI Components Used in This Design

2.2 F28P65x LaunchPad Demo Program

The LAUNCHXL-F28P65X includes a TMS320F28P650DK9NMR device pre-programmed with a demo program. When the LaunchPad is powered on, the demo program begins with an LED blink sequence on LED4 and LED5. After a few seconds, the device switches into an ADC sampling mode.

Every 1 second, the ADC samples pin ADCINA4 and the sampled value is represented as follows: If the sample is above mid-scale (2048), the red LED4 illuminates. If the sample is below mid-scale, the green LED5 illuminates.

By default, the ADC is configured in external voltage reference mode. Thus, the shunt on J15 must be connected to make use of the on-board 3.0 V high-precision voltage reference device (REF6230). The mid-scale point occurs around 1.5 V. For more information about the analog voltage reference, see Section 3.1.11.

In addition to the LED indicators, ADC sample results are also displayed on your PC through the USB/UART connection. To view the UART information on your PC, first determine the COM port associated with the LaunchPad (see Figure 2-1). To do this in Windows, open the Device Manager. Look for an entry under Ports (COM & LPT) titled "XDS110 Class Application/User UART (COMX)", where X is a number. Remember this number for when you open a serial terminal.

GUID-20230614-SS0I-F7LW-CB4Q-JQHPV2NQKBMS-low.svgFigure 2-1 LaunchPad XDS110 COM Port

The demo application's UART data was tested using PuTTY, which is a free and open-source terminal emulator. To view the UART data in a serial terminal program, open the COM port found using the Windows Device Manager with the following settings:

115200 Baud, 8 data bits, no parity, 1 stop bit.

After properly opening the serial port in your serial terminal, reset the LaunchPad by pressing the S1 reset button and observe the serial terminal to see the TI logo in ASCII art (see Figure 2-2).

GUID-20230614-SS0I-HL4V-3BSN-KQVX3LKGQ7TZ-low.svgFigure 2-2 LaunchPad Demo Serial Terminal - TI Logo

After a few moments, the ADC value sampled on the ADCINA4 pin appears in the bottom right corner of the terminal and is updated each second (see Figure 2-3). Using a jumper wire, connect the ADCINA4 header to a 3.0 V, GND, or other 0-3.0 V signal to see the on-screen value change.

GUID-20230614-SS0I-JLZB-0KNQ-H4393KPZVQDW-low.svgFigure 2-3 LaunchPad Demo Serial Terminal - ADC Sampling