Hardware/PICEBS3/Welcome

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Welcome to the PICEBS3 wiki

PICEBS3 is the name of a small embedded computer board targeted at teaching embedded systems programming based on the Mikroe EasyPicPro v8 board. As its name suggests, it is the third iteration of a successful family of Microchip PIC board.

The Mikroe board has been just modified for our laboratories usage.

Please note that, as a student, you can loan a board for free during your studies to work at home. Just ask the laboratory responsible Pascal Sartoretti (sap) for the procedure to follow.

PICEBS3.jpg

We, the PICEBS3 team, provide a comprehensive solution for

  • Practical work for HEI course Information System given in second year.
  • All kind of project featuring a small-sized micro-controller.


What can be done with the PICEBS3?

The board is powerful enough to run applications with:

  • LCD and touch screen interface
  • Serial port usage (UART)
  • CAN interface
  • ...

To program this board, you do not require an external programming probe, as it already includes a "Microchip Snap"system for programming and debugging. All you need is an USB port and the free MPLAB-X IDE. Caution, the USB câble has to be an USB-A cable.

Hardware

Photo Schematic Datasheets
PICEBS3.jpg PICEBS 3 Box

PICEBS 3 - EasyPICPro v8 schematic

CPU board 18F97J94

Mikrobus CAN MCP2518FD

LCD capacitive 800x480

LCD 2x16 chars

CPU PIC18F97J94 datasheet 
LCD controller SSD1963 datasheet 
CAN FD controller MCP2518FD datasheet 



Here is a list of the main PICEBS3's characteristics:

  • CPU PIC18F97J94
    • High range PIC18 family with 128kB Flash & 4kB RAM, Lite PPS
    • XLP technology (deep sleep @ 80nA)
    • 12 bits ADC
    • 9 timers
    • RTC
    • 4 UART, 2 SPI, 2 I2C
    • USB device (Low and Full Speed)
    • ...
  • Onboard SNAP debugger (not on EasyPicPro v8 standard)
    • Compatible with MPLABX IDE (usage of USB-A cable is mandatory)
  • I/O ports
    • 10 ports with optional led
    • each of them with a button (pull-up or pull-down selectable)
  • Displays (only one usable at the same time)
    • LCD Display
      • 800x480
      • Capacitive multi points touch screen
      • Backlight
    • 2x16 char display
      • Backlight
  • Networking and communication
    • CAN bus
    • RS232 (throuth USB FTDI)
    • USB interface (device, low or full speed)
    • Ethernet interface(not with the CPU module PIC18F97J94)
  • Development
    • Almost all CPU pins are available on connectors
    • CPU current measure available on a 1 ohm resistor (not on EasyPicPro v8 standard)

Software

Use MPLABX-IDE (download) development system.

Use XC8 compiler (download) for C programming.


To access these files on hevs gitlab, choose the user: "hevslabs" with the password: "hevslabs" (standard login, not LDAP)

Tips & tricks

  • CPU speed control
// to work at maximum CPU speed (64MHz) insert following code at start.
   OSCCON3 = 0;            // for 64MHz cpu clock (default is 32MHz)
   ...
  • Assembler example
#include <xc.inc>  
#include "conf_bits.inc"
PSECT main,class=CODE
main:    
 	movlw    0x00        ; move literal value 0x00 to W
 	movwf    TRISH,a     ; move the content of W to TRISH, (access bank)
	movlb	 0x01	     ; select bank
 	movwf    0x125,b     ; move W to memory position 0x125 (banked) 
 	goto $               ; stay here
    end main
  • Configure PPS lite UART1 to FTDI PICEBS3 USB interface
// code in C
  RPOR18_19bits.RPO18R = 1; // map RC6 to RX FTDI (output of CPU) UART1_TX
  RPINR0_1bits.U1RXR = 4;   // map RC7 to TX FTDI (input of CPU) UART2_RX

// code in assembler (movff because banked)
  MOVLW  0x01
  MOVFF  WREG,RPOR18_19
  MOVLW  0x04
  MOVWF  WREG,RPINR0_1

  • Change one bit on a port
// to change one bit on a port, use LATx and not PORTx
   LATH2 = 1;            // turn led on for example
   ...
  • Interrupt implementation with XC8 compiler (below 2.0) and (2.0 or above)
// below 2.0 implementation
void interrupt AnyISR(void)
{
  if(INT0IF == 1)
  {
    ...
  }
}
// 2.0 or above implementation
void __interrupt(high_priority) AnyISR(void)
{
  if(INT0IF == 1)
  {
    ...
  }
}

Bugs, issues, questions and comments

Feel free to contact the PICEBS3 team if you encounter a problem. Do not forget to have a look at the Tips & tricks section.

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