U731219879 rc: Created page with "Setup '''ATmega328P Target Bd''' at 1MHz and flash the blink program to chip that blinks an LED.
'''Prerequisites''': Know how to use '''AVRdude''' with a '''USB program..."

2019-03-23T03:40:52Z

Created page with "Setup '''ATmega328P Target Bd''' at 1MHz and flash the blink program to chip that blinks an LED. '''Prerequisites''': Know how to use '''AVRdude''' with a '''USB program..."

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Setup '''ATmega328P Target Bd''' at 1MHz and flash the blink program to chip that blinks an LED. 
'''Prerequisites''': Know how to use '''AVRdude''' with a '''USB programmer'''. (usbtiny, usbasp, etc.....)
'''avrdude -p m328p -c usbtiny -v''' | '''avrdude -p m328p -c usbasp -P usb -v'''
* Connect '''USBtiny''' to '''ATmega328P Target Board'''. 
* Test the connection to programmer: '''''avrdude -p m328p -c usbtiny -v''''' 
* Connect LED with pull down resistor to '''Pin D13''' on '''ATmega328P Target bd'''. (Not needed if using Target Bd built in Yellow LED) 
* Open '''Arduino IDE''' and change the following settings: Under the '''Tools''' tab 

'''Board:''' ='''"Arduino/Genunio Uno"'''
'''Programmer:''' = '''"USBtiny or USBasp"'''
* Copy-Paste/Load '''BlinkATmega328P.ino''' Arduino file. ('''Do not Flash at this time''') 

/* BlinkATmega328P.ino
Turns on an LED for one second, then off for one second, repeatedly.
AVRdude Embedded Workshop - Rusty Cain 2018
Demonstrate Changing the Fuse setting using AVRdude. */

#define LED_YELLOW 13
void setup()
{
pinMode(LED_YELLOW, OUTPUT); // Define pin as output
}
void loop()
{
digitalWrite(LED_YELLOW, HIGH); // turn the LED on (HIGH is the voltage level)
delay(100); // wait for a second
digitalWrite(LED_YELLOW, LOW); // turn the LED off by making the voltage LOW
delay(100); // wait for a second
}

* Validate ATmega328P clock speed is set to the 1 MHz default by using the following command for reading fuse settings. 
'''''avrdude -p m328p -c usbtiny -v''''' 
[[File:1MHzSettingPic.PNG]] 

'''1 MHz Default Settings:'''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0x62:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m

* Generate the binary file by selecting under the '''Sketch''' Tab: '''''"Export complied Binary"'''''
* Flash the chip by Selecting '''Upload Using Programmer''' under '''Sketch''' Tab in '''Arduino IDE'''. 
* Notice the speed of the blinking LED at 1MHz.
* Using AVRDude Set Fuses to '''8MHz''' 
'''8 MHz Settings:'''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0xE2:m -U hfuse:w:0xD6:m -U efuse:w:0xFF:m
[[File:8MHzSettingPiv.PNG]]
* Notice the faster blink rate. 
* Using AVRDude Set Fuses to 16MHz. Needs 16MHz external clock which is included on the Target board 
'''16 MHz Settings'''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0xFF:m -U hfuse:w:0xDE:m -U efuse:w:0xFF:m
[[File:16MHzSettingPic.PNG]]
* Notice the even faster blink rate. 

* Using AVRDude Set ATmega328P Chip back to 1MHz 
'''1 MHz Default:'''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0x62:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m
* Notice the blink rate. 
'''Special Note:'''
Some '''Arduino libraries''' are written to only work at '''16 MHz'''.
Always check the '''Fuse setting''' if devices are not working properly.
When changing '''Fuse setting''' always ensure the correct '''Baud Rate''' for any serial '''RS232 UART''' communications.
'''Examples of Clock fuse setting commands:'''
'''1 MHz''' ATmega328P Default Fuse Settings
avrdude -p m328p -c usbtiny -v -U lfuse:w:0x62:m -U hfuse:w:0xD9:m -U efuse:w:0xFF:m
'''8 MHz Internal clock '''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0xE2:m -U hfuse:w:0xD6:m -U efuse:w:0xFF:m
'''16 MHz Default'''
avrdude -p m328p -c usbtiny -v -U lfuse:w:0xFF:m -U hfuse:w:0xDE:m -U efuse:w:0xFF:m
'''Arduino Uno: 16 MHz''' Standard Arduino Uno settings.
avrdude -p m328p -c usbtiny -v -U lfuse:w:0xFF:m -U hfuse:w:0xDE:m -U efuse:w:0x05:m = Arduino Uno

'''Project 1 completed. '''

==[[ AVRDUDE Class ]]==

Programming ATmega328P Target Bd - Revision history

U731219879 rc: Created page with "Setup '''ATmega328P Target Bd''' at 1MHz and flash the blink program to chip that blinks an LED. '''Prerequisites''': Know how to use '''AVRdude''' with a '''USB program..."

U731219879 rc: Created page with "Setup '''ATmega328P Target Bd''' at 1MHz and flash the blink program to chip that blinks an LED.
'''Prerequisites''': Know how to use '''AVRdude''' with a '''USB program..."