Oppenheimer Technologies

1
Oppenheimer Technologies

• Rick King
• Jonathan Creekmore

2
Problem

• Current programming solutions for the Ubicom SX
  microcontroller are expensive.
• Typical costs range from 150-240.

3
Our Solution

• NADS Not Another Development System
• A low-cost programmer that can be built by
  students for less than 50 in components and open
  software.

4
Hardware Design
Ubicom SX-18
Flash Programming Voltage
In-System Programming Interface
PC
Target System
5
RS-232 Interface
Ubicom SX-18
PC
6
RS-232The Concept

• Most Commonly Available Serial Communications
  Protocol for Computer.
• Transceiver Necessary to Translate Between RS-232
  Voltage Levels and CMOS Levels.

7
RS-232 Schematic
U4
17
14
RA0
Vdd
18
5
RA1
Vss
Receive
1
RA2
Transmit
2
RA3
6
RB0
OSC1
7
16
RB1
OSC1
8
15
OSC2
RB2
OSC2
9
RB3
10
3
RB4
RTCC
MCLR
11
4
RB5
MCLR
12
RB6
13
RB7
8
Wheres the UART?

• A UART Converts Between Asynchronous Serial Data
  and Parallel Data
• This Function is Performed by the SX-18 using
  Ubicoms Virtual Peripherals.

9
Flash ProgrammingVoltage
Ubicom SX-18
Flash Programming Voltage
Target System
10
Flash Programming Voltage

• The Ubicom SX Family of Processors Require 12 V
  to Program the Flash Memory.
• Design is Limited to a Single 5 V Power Supply.
• 12 V Must Be Generated on Demand for Programming.

11
Flash Programming Voltage Schematic
J1
1
2
3
662-Out
4
5
6
ISP Header
12
In-System Programming Interface
Ubicom SX-18
In-System Programming Interface
Target System
13
Frames and Cycles

• 17 Frames Per Word
• 5 Cycles Per Frame
• Initiated by Application of 12V Programming
  Voltage

14
In-System Programming Schematic
U4
17
14
RA0
Vdd
18
5
RA1
Vss
1
RA2
2
RA3
6
RB0
7
16
RB1
OSC1
OSC2_Ext
8
15
RB2
OSC2
9
RB3
10
3
RB4
RTCC
11
4
RB5
MCLR
12
RB6
13
RB7
15
PCB Layout
16
Waveform
17
Hardware Costs

• Current Parts Cost 30.00
• Possible Cost Reductions
• Reduce PCB Cost from 10 to 0.70
• Potential Cost (1000 quantity) 15.00

18
Demo Plan

• Create sample program that has output noticeable
  to the audience.
• Modify program based on audience interaction.
• Program test microcontroller and demonstrate with
  the new code.

19
Serial Communications
Programmer
0100111111001110
20
DLL Communications
Programmer
4FCEE3
010011111100111011100011
21
Checksum Algorithm
Checksum (payload, length, cksum) Begin cksum
0 for i 1length cksum payloadi
cksum end cksum cksum 1 End
22
Checksum Demo
payload 4FCE length 2 Iteration 0 cksum
0 cksum 4F cksum Iteration 1 cksum
4F cksum CE cksum Iteration 2 cksum
1D cksum cksum 1
cksum E3
23
ISP Protocol -- Program
Yes
Start Session
Program Image
Done?
No
No
Get Device Word
Program FuseX
Done?
Yes
Yes
No
Erase
Done?
Image Done?
No
Yes
24
Speed Increase

• Common commands must be repeated multiple times
  to be effective
• Serial communications channel cannot provide
  adequate bandwidth for a full image
• Solution

25
ISP Protocol -- Program
Start Session
No
Image Done?
Program Image
Get Device Word
Yes
Erase
Program FuseX
26
Screenshot