Search found 4 matches
- Fri Dec 18, 2009 1:21 pm
- Forum: V-USB
- Topic: Device descriptor read/64, error -71; no ISR?
- Replies: 8
- Views: 6586
Re: Device descriptor read/64, error -71; no ISR?
Anyway, what are your fuse values ? You need to set the BOOTSZ bits to 1024 words (2kbytes), BOOTRST needs to be enabled. My flags are: # m # #Features # Ext. Full-swing Crystal, Ceramic resonator, BOD enabled, Start-up Time PWRDN/RESET 1K CK/14 CK + 0ms; [CKSEL=0110 SUT=10] # Clock output on PORTB...
- Tue Dec 15, 2009 3:53 am
- Forum: V-USB
- Topic: Device descriptor read/64, error -71; no ISR?
- Replies: 8
- Views: 6586
Re: Device descriptor read/64, error -71; no ISR?
After defining the ID resistor you need to explicitly connect it via usbDeviceConnect() . Thanks Wait a second -- 328p ? Did you see this ? Yup: I saw this post: viewtopic.php?f=8&t=2663#p11936 and therefore changed line 60 in usbdrvasm.S to: # ifndef USB_INTR_VECTOR /* default to hardware inte...
- Sat Dec 05, 2009 10:00 am
- Forum: V-USB
- Topic: Device descriptor read/64, error -71; no ISR?
- Replies: 8
- Views: 6586
Re: Device descriptor read/64, error -71; no ISR?
Bad Zeners would be my guess. For P type AVRs you really need 3.6V Z-diodes that are <= 500mW. Unfortunately the electronics shop here only had 3.3 and 3.9 Zeners maybe they can order others though (If i can explain that in Japanese...) Indeed the effect of these is that the polarizing current is t...
- Thu Dec 03, 2009 8:35 pm
- Forum: V-USB
- Topic: Device descriptor read/64, error -71; no ISR?
- Replies: 8
- Views: 6586
Device descriptor read/64, error -71; no ISR?
Hi all, I am trying to port avrusbboot from m to the latest (2009-08-22) version of v-usb I am using an atmega 328p at 20MHz, crystal oscillator (supported by the latest v-usb, but not the one in arvusbboot) I am using the following circuit: Vcc is 5V (3.3V is not enough for 20MHz) 1.5k pullup from ...