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MCP2120/MCP2150 Developer’s Kit User’s Guide
FIGURE 2-18:
MCP2120 TUTORIAL SYSTEM
To IrDA? Standard Developer ’s Kit Power Supply (9V)
MCP2120 Developer ’s Board #1
To PC #1
MCP2120 Developer’s Board
02-01608 Rev. 1
IR
Pair of 18 ″ Power Jumper Cables
MCP2120 Developer ’s
Board #2
To PC #2
2.6.1
System Debug Tips
If you are not getting communications between the two boards, some debugging is in
order. Here are some suggested steps:
?
?
?
?
Verify that the Hyperterminal programs are set up correctly
Verify that both Hyperterminal sessions are “connected”
Verify that the MCP2120 Developer ’s Boards are powered
Verify that the MCP2120 Developer ’s Boards are set up correctly
If that review does not locate the issue, then more in depth debugging is required.
These steps require an oscilloscope. A digital 4-channel oscilloscope is recommended.
By typing a data byte into Hyperterminal on the PC, the oscilloscope can be used to
determine where in the system the data byte was “lost”.
Figure 2-19 and Figure 2-20 shows a debug flow to help troubleshoot the communica-
tions between the two MCP2120 Developer ’s Boards. Figure 2-19 shows the steps for
the transmit side of System #1 (PC #1 and MCP2120 Developer ’s Board #1). If it
appears that the TXIR signal is correct, then the receive side needs to be validated.
Figure 2-20 shows the steps for the receive side of System #2 (PC #2 and MCP2120
Developer ’s Board #2).
These steps can then be used to debug the transmit side of System #2 and the receive
side of System #1.
DS51246C-page 32
? 2005 Microchip Technology Inc.
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