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ATmega 328pu with 16x2 lcd interfacing I2c via PCF8574T
I found the lcd_i2cmaster_test.c file on a USB stick.   The code was slightly different.   I have migrated the original AS6 project to AS7.   Please note that...
Sun. Feb 17, 2019 - 04:28 PM
I2C Communication Between Two ATtiny44's?
The obvious strategy would be to use a regular Arduino board.   The Wire.h library can provide Master and Slave.   The TinyWire.h library probably "works" with...
Sun. Feb 17, 2019 - 01:48 PM
ATmega 328pu with 16x2 lcd interfacing I2c via PCF8574T
The code in #1 was written by me 5 years ago. I asked where you found it. I could then give you an accurate answer to your question. . Using 100 would create overflows when...
Sun. Feb 17, 2019 - 07:39 AM
UC3 is Legacy
Surely you could just ask Digikey, Mouser, ...   I am always terrified by the apparent stock levels of obsolete devices at Distributors. If a popular memory chip has a pin-...
Fri. Feb 15, 2019 - 11:55 AM
Executing a full software from RAM
I don't know the answer.   However Rowley loads the "flash programmer" into SRAM.   And executes this from SRAM.   I have never investigated how it works...
Fri. Feb 15, 2019 - 10:30 AM
Executing a full software from RAM
You can run from SRAM with any ARM.    You select the appropriate style in Rowley.     I presume that you choose an appropriate startup.S file in...
Fri. Feb 15, 2019 - 10:10 AM
Oscillator calibration. Or decallibration
I wrote a simple sketch.    It should run on any AVR with OSCCAL.    Note that micros() has some latency but it shows the range of RC frequency as...
Thu. Feb 14, 2019 - 11:49 PM
ATmega 328pu with 16x2 lcd interfacing I2c via PCF8574T
Where did you get the project code from?   I can't find a "lcd_i2cmaster_test.c" on this Desktop PC.   Fleury's twimaster.c defaults to /* I2C clock in Hz */ #define...
Thu. Feb 14, 2019 - 04:32 PM
Oscillator calibration. Or decallibration
My argument was completely WRONG.   Yes,   if the EEPROM takes 3.3ms @ 8MHz RC,  it will only have 2.03ms @ 13Mhz.   Which is significantly shorter....
Thu. Feb 14, 2019 - 02:52 PM
Oscillator calibration. Or decallibration
Whether you test at the Wafer or after packaging is a matter of practical convenience. If a die fails on the Wafer,  there is little point in packaging it.   On the...
Thu. Feb 14, 2019 - 01:43 PM
Oscillator calibration. Or decallibration
I would guess that OSCCAL is a resistor ladder.   No need for complex laser trimming.    The OSCCAL calibration value will be determined at Wafer-test....
Thu. Feb 14, 2019 - 12:37 PM
Oscillator calibration. Or decallibration
I am aware that R, C tolerances are very big on a silicon chip. But the R can be laser trimmed or extra Rs can be switched in and out. Either at manufacture or with User...
Thu. Feb 14, 2019 - 10:17 AM

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