Difference between revisions of "SJ One Board"
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'''Board Features :''' | '''Board Features :''' | ||
* LPC1758 CPU - 512K ROM, 64K RAM | * LPC1758 CPU - 512K ROM, 64K RAM | ||
| − | * | + | * 4 Switches and 4 LEDs (both hard-wired) |
| − | * | + | * Sensors : |
| − | * | + | *: Temperature, 3-Axis Acceleration, IR (remote control), and Light |
| − | + | * 2-Digit 7-Segment Display | |
| − | |||
| − | * 2-Digit | ||
* RTC Crystal with Backup Battery | * RTC Crystal with Backup Battery | ||
| − | * SD Card and 1Mb SPI Flash. | + | * Micro SD Card and 1Mb SPI Flash. |
| − | * Socket for Xbee or Wifi Module (Uart3) | + | * Socket for Xbee or Wifi Module (Uart2 or Uart3) |
| − | * | + | * Built-in Nordic Wireless (Board-to-Board communication) |
| + | * Many GPIOs with two SPI, Multiple UARTs, and I2C availability | ||
* Power from USB or External Power | * Power from USB or External Power | ||
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| − | |||
| − | |||
| − | |||
== Board Block Diagrams == | == Board Block Diagrams == | ||
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=== Board IO === | === Board IO === | ||
[[File:devtutorial_SjOneIO.png|center|frame|SJ One Board IO]] | [[File:devtutorial_SjOneIO.png|center|frame|SJ One Board IO]] | ||
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== Board Schematic == | == Board Schematic == | ||
Revision as of 20:17, 13 June 2013
Contents
Introduction
This article provides details of the SJ-One Board used by San Jose State University.
Contact Preet if you need to get one of these boards.
LPC1758 User Manual
Board Features :
- LPC1758 CPU - 512K ROM, 64K RAM
- 4 Switches and 4 LEDs (both hard-wired)
- Sensors :
- Temperature, 3-Axis Acceleration, IR (remote control), and Light
- 2-Digit 7-Segment Display
- RTC Crystal with Backup Battery
- Micro SD Card and 1Mb SPI Flash.
- Socket for Xbee or Wifi Module (Uart2 or Uart3)
- Built-in Nordic Wireless (Board-to-Board communication)
- Many GPIOs with two SPI, Multiple UARTs, and I2C availability
- Power from USB or External Power
Board Block Diagrams
The block diagrams below show the connectivity to various different chips on the PCB, and also show which GPIOs are available to you. The first diagram shows the pins used for on-board sensors or interfaces. The second diagram shows IOs you can use.
Board Connections
Board IO
Board Schematic
Download the PDF Schematic here:
File:2012SJOneBoardSchematic.pdf
Board Overlay
This board overlay can be compared against diagrams above to get an idea of where the IOs are located.
External SPI Devices
To hook up your external SPI device(s), use SPI#1 connections because there is already a driver in SJ-One sample project for this SPI. See the connections below and the sample code:
#include "spi1.h"
void access_my_spi_device()
{
// Send 0xDEAD over to SPI device and get 2 bytes back:
chip_select_my_device(true);
{
char byte_0 = spi1_ExchangeByte(0xDE);
char byte_1 = spi1_ExchangeByte(0xAD);
}
chip_select_my_device(false);
/**
* You can use any GPIO for CS (chip-select) signal.
* This example assumes CS is done through a function:
* chip_select_my_device(bool);
*/
}
External I2C Devices
I2C#2 is tied to on-board sensors and you should utilize I2C 2's connection to hook up external I2C devices. See the connections below and the sample code:
#include "I2C2.hpp"
void send_byte_to_my_i2c_device()
{
const char my_dev_addr = 0xBA; // Your device address
const char my_dev_reg = 0x01; // Write to 1st register of your device
const char my_dev_data = 0xAB; // Write 0xAB to reg 0x01
I2C2::getInstance().writeReg(my_dev_addr, my_dev_reg, my_dev_data);
}
