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cile
Joined: 10 May 2009
Posts: 17
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| USB communication 18f4550 <-> PC |
 Posted: Tue Aug 02, 2011 8:28 am |
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Hello !
I created small test board with PIC 18f4550 for USB communication between PC and PIC. I made GUI on the PC side which's job is to communicate with PIC. I have tested USB CCS CDC driver & example, works fine. (GUI in Matlab, communication via UART)
Now, I want to communicate like HID device. There is GUI implemented in C# Visual Studio 2010 (included dll. files for handling with USB), and I have problems.
Here is the simple code for PIC:
| Code: |
#include <18F4550.h>
#fuses HSPLL,NOWDT,NOPROTECT,NOLVP,NODEBUG,USBDIV,PLL5,CPUDIV1,VREGEN
#use delay(clock=48000000)
#include <flex_lcd.c>
#define USB_CONFIG_HID_TX_SIZE 64
#define USB_CONFIG_HID_RX_SIZE 64
#define USB_CON_SENSE_PIN PIN_B3 // sense pin
#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
void main(void)
{
int8 in_data[64];
usb_init();
lcd_init();
lcd_putc('\f');
lcd_putc("USB test");
while (TRUE)
{
usb_task();
if (usb_enumerated())
{
if (usb_kbhit(1))
{
usb_get_packet(1, in_data, 64);
lcd_putc("Anything"); //just to test if the program go in the loop, message has to be displayed on the LCD
printf(lcd_putc,"%u"in_data);
}
}
}
} |
Problem is, that 'usb_kbhit(1)' is never true, LCD screen nothing shows  so, input buffer is empty... or?!?
I'm sending from GUI data size of 64 bytes
| Code: |
int bufferPointer;
Byte data = 0;
for (bufferPointer = 0; bufferPointer < 64; bufferPointer++)
{
// We send the numbers 0 to 63 to the device
outputBuffer[bufferPointer] = data;
data++;
}
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For two days I can not solve this...
When I connect PIC to PC, PC recognizes HID device ("ready to use")...
I have no idea |
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xxopiumxx
Joined: 01 Jul 2011
Posts: 20
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| Posted: Wed Sep 07, 2011 8:32 am |
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Before anything, there is something missing on your header,
like this:
| Code: |
#DEFINE USB_HID_DEVICE TRUE
#define USB_EP1_TX_ENABLE USB_ENABLE_INTERRUPT
#define USB_EP1_TX_SIZE 64
#define USB_EP1_RX_ENABLE USB_ENABLE_INTERRUPT
#define USB_EP1_RX_SIZE 64
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Otherwise the device will not know either you are working on hid, or non-hid.
Make sure that your device is perfectly configured while working through USB, because it is quite a tricky one. |
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