#include <18F2550.h>
#include <pic18_usb.h> //Microchip PIC18Fxx5x hardware layer for usb.c
#include <usb_desc_hid.h> //USB Configuration and Device descriptors for this UBS device
#include <usb.c> //handles usb setup tokens and get descriptor reports
#use fast_io(A) // all other ports default to 'standard_io'
#use fast_io(B) // fast_io means the tris bits only change
#use fast_io(C) // when we explicitly set them.
#byte PORTA = 0xF80
#byte PORTB = 0xF81
#byte PORTC = 0xF82
#byte ADCON1 = 0xFC1
#byte INTCON2 = 0xFF1
#bit RS = PORTC.0
#bit RW = PORTC.1
#bit EN = PORTC.2
#bit BUSY = PORTB.4
#bit EXT_INT0 = PORTB.0
#bit INTEDG0 = INTCON2.6
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
int digit = 0, count = 0;
void delay()
{
int i,j;
for(i = 0; i < 100; i++);
}
void init_io()
{
SET_TRIS_A(0x00);
// set up PORTB so RB0 is an input for the switch SW1, RB1-RB7 are outputs
SET_TRIS_B(0x01); // RB0 0 = input
ADCON1 = 0b00001111; //AN0-AN12 digital I/O
// set up remaining ports to be all outputs
SET_TRIS_C(0x00);
}
void wait_lcd()
{
RS = 0; //command
RW = 1; //read
EN = 0;
PORTA = 0x0F;
PORTB = PORTB | 0b00011110;
EN = 1; //Send the command
SET_TRIS_B(0b00010000);
while (BUSY == 1); //check if LCD is still busy
SET_TRIS_B(0x00);
PORTB = PORTB & 0b00000001;
RW = 0; //Turn to write commands
}
void init_lcd()
{
EN = 1;
PORTA = 0x08; //Communicate with 8-bit data bus, 5x8 character font
PORTB = PORTB | 0b00000110;
EN = 0;
wait_lcd();
EN = 1;
PORTA = 0x0E; //turn LCD and cursor on
PORTB = PORTB & 0x01;
EN = 0;
wait_lcd();
}
void clear_lcd()
{
PORTA = 0x01;
EN = 1;
EN = 0;
wait_lcd();
}
void write_text()
{
EN = 1;
RS = 1;
PORTA = digit;
PORTB = PORTB | 0b00000110;
EN = 0;
wait_lcd();
}
#INT_EXT
EXT_isr()
{
int units, decs, flag = 0;
delay();
while(EXT_INT0);
clear_lcd();
count = count + 1;
if (count > 10)
flag = 1;
jump:
if (flag == 0)
{
digit = count;
write_text();
}
if (flag == 1)
{
decs = count / 10;
digit = decs;
write_text();
units = count % 10;
digit = units;
write_text();
}
}
void main(void)
{
int8 out_data[4];
int8 in_data[4];
init_io();
init_lcd();
clear_lcd();
clear_interrupt(INT_EXT);
ext_int_edge(0,L_TO_H);
enable_interrupts(INT_EXT);
enable_interrupts(GLOBAL);
usb_init_cs();
while (TRUE)
{
if (usb_enumerated())
{
if (usb_kbhit(1))
{
usb_get_packet(1, in_data, 4);
}
delay_ms(1);
}
}
}
От примера за USB съм оставил само хедърите и сорсовете за процесора, който ползвам и съм добавил един модул за управление на LCD. В usb_desc_hid.h съм променил само размерите на HID_TX_SIZE и HID_RX_SIZE. Оттам се извиква usb.h, който изглежда така:
#IFNDEF __USB_PROTOTYPES__
#DEFINE __USB_PROTOTYPES__
//// CONFIGURATION ////////////////////////////////////////////////////////////
#ifndef USB_CON_SENSE_PIN
#define USB_CON_SENSE_PIN 0
#endif
#IFNDEF USB_HID_BOOT_PROTOCOL
#DEFINE USB_HID_BOOT_PROTOCOL FALSE
#ENDIF
#IFNDEF USB_HID_IDLE
#DEFINE USB_HID_IDLE FALSE
#ENDIF
//should the compiler add the extra HID handler code? Defaults to yes.
#IFNDEF USB_HID_DEVICE
#DEFINE USB_HID_DEVICE TRUE
#ENDIF
#IFNDEF USB_CDC_DEVICE
#DEFINE USB_CDC_DEVICE FALSE
#ENDIF
//set to false to opt for less RAM, true to opt for less ROM
#ifndef USB_OPT_FOR_ROM
#define USB_OPT_FOR_ROM TRUE
#endif
#IFNDEF USB_MAX_EP0_PACKET_LENGTH
#DEFINE USB_MAX_EP0_PACKET_LENGTH 8
#ENDIF
////// USER-LEVEL API /////////////////////////////////////////////////////////
/**************************************************************
/* usb_enumerated()
/*
/* Input: Global variable USB_Curr_Config
/* Returns: Returns a 1 if device is configured / enumerated,
/* Returns a 0 if device is un-configured / not enumerated.
/*
/* Summary: See API section of USB.H for more documentation.
/***************************************************************/
int1 usb_enumerated(void);
При деклариране на първата функция на USB грешката е: A #DEVICE required before this line
