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1300 Henley Court

Pullman, WA 99163

509.334.6306

www.digilentinc.com

chipKIT™ Basic I/O Shield™ Reference Manual

Revised August 27, 2013

This manual applies to the chipKIT Basic I/O Shield rev. C

DOC#: 502-216

Other product and company names mentioned may be trademarks of their respective owners.

Page 1 of 13

Overview

The chipKIT Basic I/O Shield is an input/output expansion shield designed for use with chipKIT microcontroller

boards such as the Uno32™, uC32™, and the Max32™. These boards are based on the popular Arduino® IDE open-

source hardware prototyping platform.

The Basic I/O Shield provides a range of input/output devices for both beginners and advanced users. It provides

simple digital input devices such as switches and buttons, and digital output devices such as discrete LEDs and

high-current open FET drivers. It also provides more advanced devices such as an I

C EEPROM, an I

C temperature

sensor, an organic LED graphic display, and a potentiometer for use as an analog input device.

The Basic I/O Shield has the same form factor as the Uno32 board, but is also useable with the Max32 board.

The chipKIT Basic I/O Shield.

• A 128x32 pixel OLED graphic display.

• An I

C temperature sensor.

• A 256Kbit I

C EEPROM.

• An I

C daisy chain connector.

• Four push buttons.

• Four slide switches.

• Eight discrete LEDs.

• Four open-drain FET drivers.

• An analog potentiometer.

Features include:

Summary of content (13 pages)

PAGE 1
300 Henley Court Pullman, WA 99163 509.334.6306 www.digilentinc.com chipKIT™ Basic I/O Shield™ Reference Manual Revised August 27, 2013 This manual applies to the chipKIT Basic I/O Shield rev. C Overview The chipKIT Basic I/O Shield is an input/output expansion shield designed for use with chipKIT microcontroller boards such as the Uno32™, uC32™, and the Max32™. These boards are based on the popular Arduino® IDE opensource hardware prototyping platform.
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chipKIT™ Basic I/O Shield™ Reference Manual 1 Hardware Overview The Basic I/O Shield has the following hardware features: 1. Pushbuttons Four pushbuttons provide discrete momentary-contact digital inputs. These can be accessed using the digitalRead function. 2. Slide Switches Four slide switches provide discrete digital inputs. These can be accessed using the digitalRead function. 3. J2: Shield Power Connector This connector receives power from the chipKIT microcontroller board. 4.
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chipKIT™ Basic I/O Shield™ Reference Manual Note: On the Uno32 and uC32 boards, you need to set jumpers JP6 & JP7 to the correct position to 2 access the I C signals on that board. On the Max32 board, you need to use jumper wires to bring the 2 2 I C signals onto the board, because the connector that provides the I C bus on the Max32 board doesn’t contact the Basic I/O Shield. 5. Discrete LEDs The eight LEDs provide discrete digital outputs.
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chipKIT™ Basic I/O Shield™ Reference Manual 2 Hardware Description The following is a description of the Basic I/O Shield and how to use it. See Appendix A for pin definitions and Appendix B for sample code to use the OLED graphic display. 2.1 OLED Graphic Display The Basic I/O Shield provides a 128x32 pixel organic LED (OLED) graphic display panel, the WiseChip/Univision UG23832HSWEG04. The UG2832 uses the Soloman Systech SSD1306 display controller.
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chipKIT™ Basic I/O Shield™ Reference Manual Digilent has a set of libraries for using the Basic I/O Shield with the chipKIT MPIDE. The OLED library can be used as-is or as a starting point for a more sophisticated graphics library. It is contained in document # DSD-0000311 (chipKIT IOShield Library.zip) which can be downloaded from the Basic I/O Shield product page at www.digilentinc.com. The OLED library is IOShieldOled. Appendix B provides sample driver code for initializing the display and writing to it.
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chipKIT™ Basic I/O Shield™ Reference Manual The FETs are labeled Q1A (pin 9), Q1B (pin 6), Q2A (pin 5), and Q2B (pin 3). These four pins are also four of the pulse width modulation (PWM) outputs supported by the chipKIT boards. The FETs can be switched using PWM via the analogWrite function. An FET is switched on by driving its gate high. When the FET is on, it provides a low impedance path to ground (similar to a closed switch to ground).
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chipKIT™ Basic I/O Shield™ Reference Manual For details on the 24LC256, see the data sheet at www.microchip.com. Temperature Sensor: A digital temperature sensor is provided using a Microchip TCN75A 2-Wire Serial 2 Temperature Sensor. The temperature sensor, IC2, is an I C device, and is located in the lower right corner of the shield. The TCN75A is rated for an accuracy of +/-1ºC and has selectable resolution from 0.5ºC down to 0.0625ºC. The 7bit device address is ‘1001000’.
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chipKIT™ Basic I/O Shield™ Reference Manual Appendix A: chipKIT Basic I/O Shield Pinout Table Uno32 Pin # Max32 Pin # 10 Function Description Notes 10 RES OLED reset JP4 on Uno32 39 83 DC OLED data/command select 13 13 SCLK OLED serial clock 11 11 SDIN OLED serial data in 40 84 VBAT_EN OLED VBAT enable 38 82 VDD_EN OLED VDD enable 33 77 LD1 User LED 32 76 LD2 User LED 31 75 LD3 User LED 30 74 LD4 User LED 29 73 LD5 User LED 28 72 LD6 User LED 27 71 LD
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chipKIT™ Basic I/O Shield™ Reference Manual Appendix B: Example Driver Code The following gives an example of code that initializes the display controller and writes the contents of a memory buffer into the display. This example is written for the chipKIT Uno32 board.
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chipKIT™ Basic I/O Shield™ Reference Manual void OledHostInit() { unsigned int tcfg; /* Initialize SPI port 2. */ SPI2CON = 0; SPI2BRG = 15; SPI2STATbits.SPIROV = 0; SPI2CONbits.CKP = 1; SPI2CONbits.MSTEN = 1; SPI2CONbits.ON = 1; //8Mhz, with 80Mhz PB clock /* Make pins RF4, RF5, and RF6 be outputs.
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chipKIT™ Basic I/O Shield™ Reference Manual */ PORTClearBits(prtVddCtrl, bitVddCtrl); DelayMs(1); /* Display off command */ Spi2PutByte(0xAE); /* Bring Reset low and then high */ PORTClearBits(prtReset, bitReset); DelayMs(1); PORTSetBits(prtReset, bitReset); /* Send the Set Charge Pump and Set Pre-Charge Period commands */ Spi2PutByte(0x8D); Spi2PutByte(0x14); Spi2PutByte(0xD9); Spi2PutByte(0xF1); /* Turn on VCC and wait 100ms */ PORTClearBits(prtVbatCtrl, bitVbatCtrl); DelayMs(100); /* Send the commands to
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chipKIT™ Basic I/O Shield™ Reference Manual ** ** ** ** ** ** ** */ none Errors: none Description: Update the OLED display with the contents of the memory buffer void OledUpdate() { int int BYTE * ipag; icol; pb; pb = rgbOledBmp; for (ipag = 0; ipag < cpagOledMax; ipag++) { PORTClearBits(prtDataCmd, bitDataCmd); /* Set the page address */ Spi2PutByte(0x22); Spi2PutByte(ipag); //Set page command //page number /* Start at the left column */ Spi2PutByte(0x00); //set low nybble of column Spi2PutByte(0x10)
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chipKIT™ Basic I/O Shield™ Reference Manual void OledPutBuffer(int cb, BYTE * rgbTx) { int ib; BYTE bTmp; /* Write/Read the data */ for (ib = 0; ib < cb; ib++) { /* Wait for transmitter to be ready */ while (SPI2STATbits.SPITBE == 0); /* Write the next transmit byte. */ SPI2BUF = *rgbTx++; /* Wait for receive byte. */ while (SPI2STATbits.