Projects with 18f2550 and c18 compile

This work is author´s property, and has been registered on the Website http://www.safecreative.com with the registration code 1609269275953 and protected under the License Creative Commo

Guillermo Alberto Pérez Guillén

This work is author´s property, and has been registered on the Website

http://www.safecreative.com with the registration code 1609269275953 and protected under the License Creative Commons Attribution-NonCommercial-NoDerivatives 4.0

The main goal is to make a compendium of useful projects to solve practical problems

In the future I intend to add more projects; and I assume that you know electronic andMicrochip C18 compilerand C++ language

These projects have been compiled with MPLAB C18, and the board that I have used isPIC18F2550

The main sensors and electronic modules that I have been used in this compendium werethe following:

48 MHz performance (12 MIPS)Pin-to-pin compatible with PIC16C7X5Program Memory Type: Flash

Digital Communication Peripherals: 1-UART, 1-A/E/USART, 1-SPI, 1-I2C1-Capture/Compare/PWM Peripherals: 2 CCP

Timers: 1 x 8-bit, 3 x 16-bit

ADC: 10 ch, 10-bit

USB (ch, speed, compliance): 1, FS Device, USB 2.0Temperature Range (C): -40 to 85

Using PIC18F2550 for connecting analogue and digital signals to the USB port IncludedVisual Basic 6 and Microchip C18 code The PIC microcontroller has 10 bit analogue todigital converter, by selecting 8 bits conversion the 2 LSB are ignored The circuit ispowered by the USB The interface to the PC is HID class The frequency counter has arange of up to 4MHz (24bits) Inputs samplings can be done at rates of 1 per second and 1

every 0.1 second HID class is a class of devices like the mouse and the keyboard; the

// Central processing loop Whenever the firmware isn’t busy servicing

PIR1bits.TMR2IF = 0;

HIDTxBuffer[2]=HIBYTE(timestamp);

for(i=4;i<HID_INPUT_REPORT_BYTES;i++)HIDTxBuffer[i]=HIDRxBuffer[i];

// The number of bytes in the report (from usb.h) wCount = HID_INPUT_REPORT_BYTES; transferType=0;

//********************************************************************// Entry point for user initialization

// Post processing for a SET_FEATURE request After all the data has// been delivered from host to device, this will be invoked to perform// application specific processing.

HIDFeatureBuffer[0]=PORTA;

HIDFeatureBuffer[1]=0xF1; //this is to differentiate between differenttransfer types

wCount = HID_INPUT_REPORT_BYTES; transferType=0;

Using PIC18F2550 for connecting analogue and digital signals to USB port IncludedVisual Basic 6 code and Microchip C18 code, and a circuit diagram The PICmicrocontroller has 10 bit analogue to digital converter The circuit is powered by theUSB The interface to the PC is HID class The inputs and outputs are updated every10ms

//********************************************************************// Entry point for user initialization

ADCON0=0B0111; //read input ch.1 while(ADCON0bits.GO_DONE){} //wait until ADC done txBuffer[2] = ADRESL;

txBuffer[3] = ADRESH;

ADCON0=0B1011; //read input ch.2 while(ADCON0bits.GO_DONE){} //wait until ADC done txBuffer[4] = ADRESL;

txBuffer[5] = ADRESH;

ADCON0=0B1111; //read input ch.3 while(ADCON0bits.GO_DONE){} //wait until ADC done txBuffer[6] = ADRESL;

TRISB = 0B11110000; //RB4-RB7 are inputs

txBuffer[7] = ADRESH | (PORTB & 0B11110000); //add inputs to ADRESH// As long as the SIE is owned by the processor, we let USB tasks continue

// Initialization for a SET_FEATURE request This routine will be// invoked during the setup stage and is used to set up the buffer

{

// When the report arrives in the data stage, the data will be // stored in HIDFeatureBuffer

Inputs samplings can be done at rates of 1 per second and 1 every 0.2 second

The cap meter (max 50uF) measures the period of charging the cap to the Vref Theaccuracy is about 5%, it depends on the charge resistors, can be calibrated by trimming1K5 and 1M5 resistors or by the VB code

{

TRISCbits.TRISC0=1; //counter’s input timers 1,2,3 to be doneTRISBbits.TRISB0=0; //discharge

while(!INTCONbits.TMR0IF){} //loop for 0.7 sec

if(PIR1bits.TMR1IF){++freq3; PIR1bits.TMR1IF = 0;} }

while(!CMCONbits.C2OUT){}

T3CONbits.TMR3ON=0;

//*********************************************************************// Initialization for a SET_FEATURE request This routine will be

HIDTxBuffer[3]=LOBYTE(timestamp);

for(i=4;i<HID_INPUT_REPORT_BYTES;i++)HIDTxBuffer[i]=HIDRxBuffer[i];

Source code:

https://drive.google.com/file/d/0B8XMvcdJvBBYa0xzLVYtdmlsWWc/view? usp=sharing