Projects with 18f2550 and c18 compile

Guillermo Alberto Pérez Guillén Projects With PIC18F2550 And C18 Compiler INDEX Introduction Blink a LED USB Frequency Counter And Voltmeter USB PC Oscilloscope USB PC Automation Home Capacitance Meter 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 INTRODUCTION 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 and Microchip C18 compilerand C++ language These projects have been compiled with MPLAB C18, and the board that I have used is PIC18F2550 The main sensors and electronic modules that I have been used in this compendium were the following: US1881 LM35DZ MQ-2 MQ-7 PIR FAN MOTOR CD PUMP LED Each chapter has a simple explanation, electronic diagram, list of part, source code, photographs and links of a video, tutorial and download source My Youtube channel and blogs are the following: https://www.youtube.com/channel/UCuePeN-Qvq3lvUVQavo4jiQ http://hubpages.com/@guillengap http://guillengap.blogspot.mx/ Email: guillengap@gmail.com Features Full Speed USB 2.0 (12Mbit/s) interface 1K byte Dual Port RAM + 1K byte GP RAM Full Speed Transceiver 16 Endpoints (IN/OUT) Internal Pull Up resistors (D+/D-) 48 MHz performance (12 MIPS) Pin-to-pin compatible with PIC16C7X5 Program Memory Type: Flash Program Memory (KB): 32 CPU Speed (MIPS): 12 RAM Bytes: 2,048 Data EEPROM (bytes): 256 Digital Communication Peripherals: 1-UART, 1-A/E/USART, 1-SPI, 1-I2C1MSSP(SPI/I2C) Capture/Compare/PWM Peripherals: 2 CCP Timers: 1 x 8-bit, 3 x 16-bit ADC: 10 ch, 10-bit Comparators: 2 USB (ch, speed, compliance): 1, FS Device, USB 2.0 Temperature Range (C): -40 to 85 Operating Voltage Range (V): 2 to 5.5 Pin Count: 28 BLINK A LED Circuit Diagram Components: Microcontroller PIC18F2550 Crystal 4 MHz Capacitor 22 pF Source code with the explanation in the comments and compiled with C18 code #pragma config FOSC = XT_XT,FCMEN = OFF,IESO = OFF, CPUDIV = OSC1_PLL2 #pragma config PWRT = ON,BOR = OFF,BORV = 0 #pragma config WDT = OFF,WDTPS = 32768 #pragma config MCLRE = ON,LPT1OSC = OFF,PBADEN = OFF,CCP2MX = OFF #pragma config STVREN = OFF,LVP = OFF,XINST = OFF,DEBUG = OFF #pragma config CP0 = ON,CP1 = ON,CP2 = ON #pragma config CPB = ON,CPD = ON #pragma config WRT0 = ON,WRT1 = ON,WRT2 = ON #pragma config WRTB = ON,WRTC = ON,WRTD = ON #pragma config EBTR0 = ON,EBTR1 = ON,EBTR2 = ON #pragma config EBTRB = ON #include “p18f2550.h” #include “delays.h” void main (void) { TRISB = 0b01111111; // PORTB bit 7 to output (0) ; bits 6:0 are inputs (1) while (1) { LATBbits.LATB7 = ~LATBbits.LATB7; // toggle LATD Delay1KTCYx(50); // Delay 50 x 1000 = 50,000 cycles; 200ms @ 1MHz } } CAPACITANCE METER Using PIC18F2550 for connecting analogue and digital signals to USB port Included Visual Basic 6 software, PIC C code and a circuit diagram The PIC microcontroller has 10 bit analogue to digital converter, by selecting 8 bits conversion the 2 LSB are ignored The circuit is powered by the USB The interface to the PC is HID class The frequency meter has a range of up to 4MHz (24bits) The meter accuracy is 0.2% or better 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 The accuracy is about 5%, it depends on the charge resistors, can be calibrated by trimming 1K5 and 1M5 resistors or by the VB code Circuit Diagram Components: Microcontroller PIC18F2550 USB Type A Crystal 4 MHz Transistor NPN Diode 1N4148 Capacitor 22 pF, 0.22 uF Electrolytic capacitor 1 uF Resistor 1K, 1K5, 10K, 1M5 Source code with the explanation in the comments and compiled with C18 code #include #include #include #include “usb.h” #include // Note: there are timing related problems associated with GET_FEATURE // when run at less than 48 MHz //#define CLK_48MHZ 1 #define dis PORTBbits.RB0 #define range1 PORTBbits.RB1 #define range2 PORTBbits.RB2 #define puls PORTBbits.RB3 #pragma config PLLDIV=1, CPUDIV=OSC1_PLL2, USBDIV=2, FOSC=XTPLL_XT//, FCMEM=OFF //CPUDIV=OSC1_PLL2=48MHz, CPUDIV=OSC3_PLL4=24MHz #pragma config IESO=OFF, VREGEN=ON, WDT=OFF PWRT=OFF, BOR=ON_ACTIVE, BORV=3, #pragma config MCLRE=OFF, PBADEN=OFF, CCP2MX=OFF, STVREN=ON, LVP=OFF, XINST=OFF, DEBUG=OFF // HID feature buffer volatile unsigned char HIDFeatureBuffer[HID_FEATURE_REPORT_BYTES]; #pragma code low_vector=0x8 void low_interrupt (void) { } #pragma code // Allocate buffers in RAM for storage of bytes that have either just // come in from the SIE or are waiting to go out to the SIE unsigned char txBuffer[HID_INPUT_REPORT_BYTES]; unsigned char rxBuffer[HID_OUTPUT_REPORT_BYTES]; unsigned int timestamp=0; extern byte transferType; unsigned char timebase, freq3; //counter’s vars //prototypes void UserInit(void); void ProcessIO(void); //***************************************************************** // Entry point of the firmware void main(void) { // Set all I/O pins to digital //ADCON1 |= 0x0F; // Initialize USB UCFG = 0x14; // Enable pullup resistors; low speed=0x10, full speed mode=0x14 deviceState = DETACHED; remoteWakeup = 0x00; currentConfiguration = 0x00; // Call user initialization function UserInit(); while(1) { // Ensure USB module is available EnableUSBModule(); // As long as we aren’t in test mode (UTEYE), process USB transactions if(UCFGbits.UTEYE != 1) ProcessUSBTransactions(); // Application specific tasks ProcessIO(); } } //******************************************************************** // Entry point for user initialization void UserInit(void) { TRISCbits.TRISC0=1; //counter’s input timers 1,2,3 to be done TRISBbits.TRISB0=0; //discharge TRISBbits.TRISB1=0; //range1 TRISBbits.TRISB2=0; //range2 TRISBbits.TRISB3=0; //puls TRISBbits.TRISB4=1; TRISBbits.TRISB5=0; TRISAbits.TRISA0=1; TRISAbits.TRISA1=1; //V input TRISAbits.TRISA2=1; //comp2 in TRISAbits.TRISA3=1; //comp1 in CMCON = 0b1110; //2 comparators, inputs RA3 RA2 ADCON1=0B1000; //ref 5v, ch0-4 analogue ADCON2=0B101110; //Ttad, left just ADCON0=0B101; //input on ch.1, ADC on T1CON=0B1000110; //prescale=1:1, timer=off, osc=off, input=pin11 T0CON=0B110; //prescale=1:128, timer=off, 16bits T2CON=0B1111011; //prescale=1:16, output=1:16, timer=off PR2=233; //5mS period } #define LOBYTE(x) (*((char *)&x)) #define HIBYTE(x) (*(((char *)&x)+1)) //******************************************************************** // Central processing loop Whenever the firmware isn’t busy servicing // the USB, we will get control here to do other processing void ProcessIO(void) { byte rxCnt; unsigned char counts; //timebase = 0; // User Application USB tasks if ((deviceState < CONFIGURED) || (UCONbits.SUSPND==1)) return; // Find out if an Output report has been received from the host rxCnt = HIDRxReport(rxBuffer, HID_OUTPUT_REPORT_BYTES); // If no bytes in, then nothing to do if (rxCnt == 0) return; //delay of 0.7 sec for 1 sec sampling option if(rxBuffer[1]){ TMR0L = TMR0H = INTCONbits.TMR0IF = 0; //reset TMR0 T0CONbits.TMR0ON = 1; while(!INTCONbits.TMR0IF){} //loop for 0.7 sec T0CONbits.TMR0ON = 0; } ADCON0bits.GO_DONE = 1; //start ADC //Frequency Meter TMR1L = TMR1H = freq3 = 0; //clear timers PIR1bits.TMR1IF = 0; PIR1bits.TMR2IF = 0; T1CONbits.TMR1ON = 1; //start count T2CONbits.TMR2ON = 1; for(counts=0;counts