This board contains an Atmel ATMega88PA-AU microcontroller. This pin assignments are given in the table below (taken from the ​schematic)

Pin	Name	In/Out	Signal	Function
12	PB0	Out	TDC_EN_in	Configuration of TDC
13	PB1	Out	TCC_EN_out	Configuration of TDC
14	PB2	Out	TDC_RST	Configuration of TDC
19	ADC6	Analog In	M1P5A	Measure 1.5V analog voltage
22	ADC7	Analog In	M1P5D	Measure 1.5V digital voltage
23	PC0	In	TDC_DOUT	Configuration of TDC
24	PC1	Out	TDC_DIN	Configuration of TDC
25	PC2	Out	TDC_CLK	Configuration of TDC
26	PC3	Out	BLINK	Green LED on board
30	PD0/RxD	In	RxD	Serial receive data
31	PD1/TxD	Out	TxD	Serial transmit data
32	PD2	In	ASD_DIN	Configuration of ASDs
1	PD3	Out	ASD_DOUT	Configuration of ASDs
2	PD4	Out	ASD_SLOAD	Configuration of ASDs
9	PD5	Out	ASD_SCLK	Configuration of ASDs
10	PD6	Out	ASD_SDOWN	Configuration of ASDs

Firmware Development Plan

On Arduino

1. Get new command parser (Eric/Val? code) and get it to run
2. Read ​muon-2002-003.pdf pages 28 and 29
3. Write code to read and write to the ASD serial interface using some Arduino pins
4. Run the code, use an oscilloscope to verify the waveforms look correct.
5. Read ​MDT_TDC_config_note.docx on the TDC configuration interface.
6. Implement code to interact with TDC, use oscilloscope to veryify waveforms look correct.
7. Implement VOLT, HELP etc

On the real hardware (next week)

1. Modify Makefile for ATMega88 and set fuses (get help!)
2. Change the pin assignments to work on real hardware (see ​schematic)
3. Run the code and test it.

Firmware Specification

Command Format

<command> [<argument>...]

Where <command> is a word beginning with a letter (upper/lower case are equivalent) and <argument> are numbers or text strings separated by whitespace.

Numeric arguments are assumed decimal unless they have a prefix "0x" in which case they are hexadecimal.

LED command

LED ON|OFF|BLINK -- turn LED on board on or off or blink at 1Hz

ASD command

The mezzanine board contains three ASD chips, each of which has 52 bits of programming information, detailed in this document: ​ASD00A_Prog.PDF.

ASD R -- Read ASD configuration and display in hex (3 groups of 13 hex digits with spaces between)

ASD W <string1> <string2> <string3> -- Write ASD configuration from 3 hex strings (each must be 13 digits long)

TDC command

TDC R -- Read TDC configuration and display (14 registers of four hex digits each)

TDC W <reg> <value> -- set TDC register <reg> to value <value>

VOLT command

VOLT -- Read and display two 1.5V power supply voltages from ADC inputs

HELP command

HELP -- print short list of valid commands