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Extra INT0 interrupt is counted
I wrote below code for testing the external interrupt. But first data transmitted on serial port is 5 and subsequently 4 are getting added correctly. However if I clear the...
Wednesday, 13 September 2017 - 12:11
Checking UDRIE bit for transmission complete status
I have written simple serial communication protocol code. Before attempting to get response from target, I am waiting for the transmission to complete. I wrote two approaches for...
Thursday, 20 July 2017 - 17:56
v-USB with Arduino Nano Board
I wanted to to load V-USB boot loader to my arduino nano board. So downloaded the files from https://www.obdev.at/products/vu... and made changes. The problem I am facing is: I...
Tuesday, 18 July 2017 - 05:46
Unable to find make.exe avr8 tool chain
I use avr8-gnu-toolchain. I am unable to find make.exe file. Which is the equivalent of it? I looked in bin folder, but did not see anything.  http://www.nongnu.org/avr-...
Saturday, 15 July 2017 - 16:17
Unable to program atmega8A through optiboot with internal clock
I loaded optiboot to Atmega8A (attached .hex) which was available in arduino install folder.   I tried to program Atmega8A with fuse settings: Hi Byte: 0xDC (Boot Size = 256...
Saturday, 15 July 2017 - 07:55
custom Timer Library issues
I wrote simple timer library (I thought this may work) and attached complete code.   I use timeoutList[] array for maintaining different timer requests. timeoutList[]...
Saturday, 8 July 2017 - 14:10
One byte EEPROM reading from 16 bit address in Atmega328P
I am getting confused with EEPROM access. avr-libc has listed several library functions to access EEPROM. One of them being  uint8_t eeprom_read_byte (const uint8_t *__p)...
Tuesday, 4 July 2017 - 10:15
pgm_read_byte vs pgm_read_byte_near
I was looking at avr-libc at http://www.nongnu.org/avr-libc/user-manual/group__avr__pgmspace.html pgm_read_byte(address_short) ultimately makes use of  pgm_read_byte_near(...
Sunday, 2 July 2017 - 02:11
PB5 behaves differently when connected to ADC7
I have written keypad interface program with nano board. I connected 4x4 membrane keypad directly to PC0 through PC5 and ADC6, ADC7 pins PC0 to PC3 are configured as inputs and...
Tuesday, 27 June 2017 - 16:27
PORT pin pulsing eventhough not commanded
I am facing strange problem with my new Atmega8A chip (china market). I have written the below code, but PORTD pins are all pulsing @74msec (15msec ON + 59 msec OFF). I am using...
Friday, 2 June 2017 - 07:37
How to check current alarm status or deactivate Alarm in DS3231
I interfaced DS3231 RTC to Atmega328. But I am not able to find out a way to deactivate the alarm that is already set. In register 0x0E, AxIE is used to enable/disable the...
Wednesday, 10 May 2017 - 12:04
Atomicity Control using individual Interrupts
I was reading few articles related to automicity control (such as in https://www.avrfreaks.net/forum/tut-newbies-guide-avr-interrupts?page=all). But most of the articles talk...
Monday, 20 February 2017 - 02:38

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