Week8：Embedded programming

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Hardware and software preparation.

• In order to programming my pcb board, I prepare some hardware and software as follows:
  • Attiny datasheet
  • Multimeter(set ohmmeter mode): to check all the wire. IF the wire is okay, the multimeter will issue 'beep' sound.
  • Arduino IDE
  • Attiny library(download from highlowtech.org)
  • FABISP / Arduino board and programing as ISP

Connect helloecho to the ISP

• accroding to this tutorial, connect the helloecho PCB board to arduino UNO board.

• attiny ping 4 to Arduino Pin 10

• attiny ping 7 to Arduino Pin 11

• attiny ping 8 to Arduino Pin 12

• attiny ping 9 to Arduino Pin 13

add attiny library to arduino IDE

• in order to upload the sketch to the attiny44, I add the attiny library to the arduino IDE.
• download the library from highlowtech.org
• unzip it, put the folder into [documents] \ arduino \ hardware \ attiny \avr
• if successed, "ATtiny" will shows in arduino menu > Tools > board.

modify the hello echo board, add 20MHz crystal

• refer to the data sheet, I modify the pcb schematic design. pull out PB0 and PB1 to connect 20MHz crystal and add two 22p electric capacity.

• the Eagle .sch file attached here / The .brd file attached as well

Programming the led

• beacuse I put the led in attiny44 pin 6, accroding to 42bots.com's tutorial, the most simple way to blink the lcd is modify the arduino sample code:"blink", change the pinMode / digitalWrite to pin7.
• "Upload Using Programmer"

Fail scenarios: When configure Arduino as ISP, error message shows 'stk500_rect()' error

• during configure arduino as ISP, I follow this tutorial.
• in the beginning, I connect all the wire and 10uF Capacitor and ArduinoISP upload fail, nomater re-install the virtual com port drivers, switch to OSX env, even use sample code to blink the arduino led.
• after discussed with others, I found that during upload the sketch to the board, need to remove all the wire to other board.
• the problem solve when disconnect the arduino and my pcb board.

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