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I2C GPS communication Problem

 
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erezb
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I2C GPS communication Problem
PostPosted: Tue Dec 16, 2008 5:25 am     Reply with quote
Hi All,
I am using a ublox5 GPS receiver that is connected to a PIC16F88.
I am trying to communicate via the i2c without success it always returns 0xFF back.

Could someone help me please.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Dec 16, 2008 12:14 pm     Reply with quote
Read their document on the i2c bus:
http://www.u-blox.com/customersupport/gps.g5/DDC_Implementation_AppNote(GPS.G5-X-08023).pdf

1. Make sure you have the pull-up resistors as shown in Figure 1
on page 4.

2. Make sure you understand the note at the start of Section 2.2 on
page 5. Read about how the slave address of 0x42 is really 0x84, when
combined with the R/W bit. (This is the way that CCS uses it, so make
sure you are using 0x84 as the address).
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