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JTAG reenable
Hello, I disabled the JTAG and SPI fuses of AT90CAN128 with the JTAG MKII adapter carelessly. Now I cannot use the JTAG interface any more. Is it possible to reenable this? I do...
Wednesday, 14 January 2009 - 02:31
INT0 must be 'high' with bootloader?
Hello, I’m using bootloader to program my AT90CAN128 over CAN. After programming the device with FLIP, the INT0 pin must be ‘high’ while resetting the processor so that the...
Tuesday, 16 December 2008 - 08:03
problem with bootloader and FLIP under CAN
Hello, I have tried to download programs into AT90CAN128 with FLIP. Everything seems to be OK but the program doesn't work. Here are my steps. 1. Program the bootloader with JTAG...
Wednesday, 3 December 2008 - 09:47
optimization levels in AVR Studio
Hello, In AVR Studio 4.12 there are 4 optimization levels. Which ones can create reliable HEX files according to your experience? I personally once used the 'Os' optimization...
Friday, 28 November 2008 - 09:25
'Frame Buffer Receive Mode' in CAN Controller of AVR
Hello, MObs in CAN Controller of AVR have a mode called 'Frame Buffer Receive Mode'. The description is: "This mode is useful to receive multi frames. The priority between MObs...
Friday, 31 October 2008 - 09:36
What makes a program very slowly?
Hello, A program runs very slowly. Is it possible to locate which codes cause this problem? As I/O I have UART and CAN. Do they play a role in speed? Thank you Senmeis
Wednesday, 3 September 2008 - 11:43
problem with "Data Breakpoint" window
Hello, I would like to know when the value of a variable is changed. I opened the "Data Breakpoint" window and made the settings, but I got an error, saying: "Unable to set data...
Wednesday, 27 August 2008 - 11:40
right shifting an int16_t value
Hello, For int16_t a = -32768 // 8000h What do we get with a = a >> 1; ? Do we get '-16384' (= C000h) or '+16384' (= 4000h)? I just can't find such description in the manual...
Friday, 15 August 2008 - 10:28
from ADC data to SIGNED16
Hello, I have to change the raw data of a 10 bit ADC into a signed, left adjusted, 16bit value to transmit it. The problem is, how I make this conversion with GCC. If this ADC is...
Tuesday, 5 August 2008 - 11:29
LP filter or decoupling capacitor
Hello, This is the statement of AVcc in the datasheet of AT90CAN128: Quote:"AVcc is the supply voltage pin for the A/D Converter on Port F. It should be externally connected to...
Friday, 18 July 2008 - 08:59
reference voltage chip for AVref?
Hi, I used to connect AVref with AVcc (with LM2576) to get the reference voltage for the ADC in AT90CAN128 and I found the ADC output is not so stable (value changes all the time...
Wednesday, 9 July 2008 - 10:53
absolute value of a subtraction
Hello, I have two unsigned values and want to get the absolute value of their difference. Is it correct with the following code? UINT16 value1, value2, abs_diff; abs_diff = abs(...
Tuesday, 15 April 2008 - 07:11