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Passing a va_list to snprintf
Hi, I would like to consolidate these lines into one function:   uint8_t n = 200; char buff[100]; snprintf(buff, sizeof(buff), "\n\r%s this is a number: %d", "Hello", n);...
Sunday, 1 May 2016 - 20:16
Wire Library and how it sets the slave address
I've been working with a simple i2c library (Peter Fleury). I added the following method to simply check if an address is valid on the bus.   uint8_t i2cScan(uint8_t address...
Sunday, 1 May 2016 - 14:43
AS7 - Missing Rename (refractoring) options
This week I finally got around to updating my AS7 to Version: 7.0.790. There use to be an option when I right click on a variable or function, I could rename it. The renaming...
Sunday, 24 April 2016 - 11:14
AS7 - Defined Symbols -
When changing a Device in AS7, AS7 will set the -mmcu argument for the compiler. For example, if I choose the Atmega2560, AS7 will add:   -mmcu=atmega2560This is a nice...
Saturday, 23 April 2016 - 12:43
SPI - Sending multiple commands and data
Hi,   I am trying to learn how to use SPI with my NRF24L01 RF Module. I am slowly making progress and have a question in regards to sending multiple commands and multiple...
Saturday, 9 April 2016 - 12:17
Nrf24L01 configuring the registers
I am working on a Nrf24L01 project. To get started I just want to send and receive a few bytes of data. Before I post a "Its not working" post, I want to try to narrow down the...
Friday, 8 April 2016 - 11:05
get values from a pointer to an array
I have the following array:   uint8_t data[5] = {0xD7,0xD7,0xD7,0xD7,0xD7};  I have a method that excepts a pointer to an array:   void doSomething(uint8_t* data...
Sunday, 3 April 2016 - 17:12
Setting value for SPDR – SPI Data Register (ATMega 2560)
Hi,   I have a simple SPI program, which should set the value of SPDR (SPI Data Register) to 0x08 (8).   #include <avr/io.h> #include <util/delay.h> #define...
Monday, 28 March 2016 - 00:57
Help selecting switch in Eagle
I am using Eagle Cad. I am having trouble finding a Reset switch for my schematic. The switch will always pass current until pressed. I believe the nomenclature is a SPST...
Saturday, 19 March 2016 - 15:07
Building a Standalone Programmer - Setting the fuses
Adafruit has a nice tutorial on building a standalone programmer. This is adopted from Optiloader by Bill Westfield. In the Adafruit version there is a note on burning fuses:...
Sunday, 28 February 2016 - 14:46
Can not program Fuses - One of more registers differs [SOLVED]
I have an Atmega328p chip which I am unable to program via ISP. Not sure why as I pulled this chip from my stash. So I throw it on my STK500 and check the fuses via HVPP. I see...
Sunday, 21 February 2016 - 22:41
UART and Interupt issue [Solved]
Hi, I have a simple example of triggering an interrupt when I receive UART data. The problem is the interrupt triggers but never returns. Not sure what I am going wrong. I am...
Saturday, 20 February 2016 - 14:06

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