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Mikzi
Joined: 18 Jun 2014
Posts: 5
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| PIC18F45K50 USB HID Test - Unknown Device Error |
 Posted: Wed Jun 18, 2014 10:19 am |
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Hi guys,
I’m trying to get a USB HID port working on a custom PIC18F45K50 board, but when I plug the USB in it appears as “Unknown device” in Windows device manager.
A blinking led test confirms that the PIC is running at the expected rate, 48MHz for fast USB. I’m using the internal regulator of the 45K50, no external crystal, and I’m running MPLAB 8.92 & CCS 5.0. Serial communication is also working fine.
Hardware wise I’ve connected the first three USB pins directly to the PIC, D+, D- and GND. The 5V is used only for connection sense (not power) and is connected to both pin A4 and GND, each through 100k resistors. The PIC’s Vusb pin is grounded with a 220 nF conductor.
The code I’m using is as follows:
| Code: | #include "18F45K50.h"
#fuses NOCPUDIV, PLLEN, PLL4X, HSH, PRIMARY, NOIESO, NOFCMEN // 12mhz crystal, 48mhz clock for pic and usb
#use delay(internal=48MHz)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, stream=PC) // Hardware uart
// Include the CCS USB Libraries.
#include <pic18_usb.h> // Microchip 18Fxx5x 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
#define USB_HID_DEVICE TRUE // Tells the CCS PIC USB firmware to include HID handling code.
#define USB_EP1_TX_ENABLE USB_ENABLE_INTERRUPT // Turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_RX_ENABLE USB_ENABLE_INTERRUPT // Turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_TX_SIZE 64 // Allocate 64 bytes in the hardware for transmission
#define USB_EP1_RX_SIZE 64 // Allocate 64 bytes in the hardware for reception
#define USB_CON_SENSE_PIN PIN_A4
void main(void)
{
int8 out_data[65];
int8 in_data[65];
int16 send_timer=0;
printf("USB test\r\n");
enable_interrupts(INT_USB);
usb_init_cs(); // Initialise USB
while(true)
{
usb_task(); // handles connects/disconnects
if (usb_enumerated())
{
if (!send_timer)
{
send_timer=2500;
out_data[0]='a';
out_data[1]='b';
if (usb_puts(1, out_data, 65, USB_DTS_TOGGLE))
printf("<-- Sending 2 bytes: %c %c\r\n", out_data[0], out_data[1]);
}
if (usb_kbhit(1))
{
usb_gets(1, in_data, 65, USB_DTS_TOGGLE);
printf("--> Received data: %c %c\r\n",in_data[0],in_data[1]);
}
send_timer--;
delay_ms(1);
}
restart_wdt();
}
} |
Any help as to what I'm doing wrong would be greatly appreciated. Thanks. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19587
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| Posted: Wed Jun 18, 2014 11:30 am |
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Your clock setup is 'dubious' (read wrong....). You are saying in the clock statement, to use the _internal_ oscillator.
Just us 'CLOCK=48MHz' (which won't override the fuses), or 'CLOCK=48MHz, CRYSTAL=12MHz'.
Your changes to the defines:
| Code: |
#define USB_HID_DEVICE TRUE // Tells the CCS PIC USB firmware to include HID handling code.
#define USB_EP1_TX_ENABLE USB_ENABLE_INTERRUPT // Turn on EP1 for IN bulk/interrupt transfers
#define USB_EP1_RX_ENABLE USB_ENABLE_INTERRUPT // Turn on EP1 for OUT bulk/interrupt transfers
#define USB_EP1_TX_SIZE 64 // Allocate 64 bytes in the hardware for transmission
#define USB_EP1_RX_SIZE 64 // Allocate 64 bytes in the hardware for reception
#define USB_CON_SENSE_PIN PIN_A4
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_Must_ be loaded _before_ the USB code. It tests for values being defined and then uses your definitions to change the settings. 'Retrospective' changing won't result in the configuration being changed... |
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Mikzi
Joined: 18 Jun 2014
Posts: 5
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| Posted: Wed Jun 18, 2014 11:53 am |
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Thank you for pointing this out. I've now moved the #defines before the includes.
I also changed the delay from #use delay(internal=48MHz) to #use delay(CLOCK=48MHz). To get this to work I also added the #fuse INTRC, to explicitly use the internal rc oscillator.
The problem with the unknown device in Windows still persists unfortunately. |
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