Nordic Star Products NRD24V1 manual Buttons, Button mapping

Headset Reference Design v1.0

3.2.5Buttons

There are five buttons on the application board and these are connected to the AVR micro controller on the radio module as shown in Figure 10. ”Button mapping”.

	SW1
	AVR pin 23
SW2	SW3	SW4
AVR pin 24	AVR pin 25	AVR pin 26
	SW2
	AVR pin 27

Figure 10. Button mapping

3.2.6Programming

The radio module can be programmed through the 6-pin ISP connector (P1) with an AVR programming tool like the STK500 from Atmel. The programming procedure is as follows:

1.If the unit has never been programmed, set the AVR fuses:

•Preserve EEPROM memory through chip erase cycle; [EESAVE = 0]

•Brown-out detection level at Vcc=1.8V; [BODLEVEL=110]

•Clock output on PORTB0; [CKOUT=0]

•Ext.Crystal Osc. Frequency 3.0 - 8.0MHz; [CKSEL=1101 SUT=11]

2.Write the SW hex file into the AVR program memory.

3.Write a 3-byte ID into the AVR EEprom. The address should be written with the MSB at address 00.

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