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| Search found 10 matches |
| Author | Message |
|---|---|
 Topic: "Ghost" driving SDO pin in SPI mode |
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| mcpublic Replies: 7 Views: 7174 |
 Forum: General CCS C Discussion Posted: Fri Aug 03, 2007 2:04 pm Subject: "Ghost" driving SDO pin in SPI mode |
| That's a very good suggestion. And I agree with your diagnosis,
as I've pretty much confirmed that it is either a hardware bug or a bug inside CCS C "PCH" SPI library (I suppose it may ... |
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| Topic: "Ghost" driving SDO pin in SPI mode |
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| mcpublic Replies: 7 Views: 7174 |
Forum: General CCS C Discussion Posted: Fri Aug 03, 2007 11:33 am Subject: Re: "Ghost" driving SDO pin in SPI mode |
| P.S. I am using the PIC18F2420's MSSP hardware to generate SPI signals. | |
| Topic: "Ghost" driving SDO pin in SPI mode |
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| mcpublic Replies: 7 Views: 7174 |
Forum: General CCS C Discussion Posted: Fri Aug 03, 2007 11:20 am Subject: Re: "Ghost" driving SDO pin in SPI mode |
| Thanks for the suggestion. This firmware doesn't #use fast_mode. But I wouldn't expect this to be an issue as I don't do any explicit I/O on the SDO pin. I just let the MSSP module control it.
M ... |
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| Topic: "Ghost" driving SDO pin in SPI mode |
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| mcpublic Replies: 7 Views: 7174 |
Forum: General CCS C Discussion Posted: Fri Aug 03, 2007 10:10 am Subject: "Ghost" driving SDO pin in SPI mode |
| I am using a PIC18F2420 as an SPI master to drive a MAX532 dual 12-bit DAC. This has been working 99% of the time, but I am occasionally seeing what seems like a "ghost" driving my SDO pin ... | |
| Topic: LVP programmer for CCS C PCH (command line version) |
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| mcpublic Replies: 1 Views: 8930 |
Forum: General CCS C Discussion Posted: Thu Mar 09, 2006 1:02 pm Subject: LVP programmer for CCS C PCH (command line version) |
| I have designed and built a R&D lab device with eight PIC18F4525's in it. I went to great efforts to make it possible to use an ICD2 to program any one of the 8 PICs. All the PGC and PGD pins ar ... | |
| Topic: WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE |
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| mcpublic Replies: 22 Views: 164802 |
Forum: Code Library Posted: Mon Feb 13, 2006 3:13 pm Subject: Debugging this i2c code -- you will want to use a scope! |
| I would not have gotten anywhere porting this i2c code to different processors and different clock speeeds if I didn't (a) have an understanding of i2c signalling (especially the ack/clock-stretching ... | |
| Topic: WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE |
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| mcpublic Replies: 22 Views: 164802 |
Forum: Code Library Posted: Mon Feb 13, 2006 2:54 pm Subject: PIC18F4525 port code |
| Here is the stripped-down hardware i2c slave code
ported to a PIC18f4525 running at 10MHz (no 4x PLL!) Below is the master code with some commentary --Tim //// i2c 16-BIT SLAVE CODE // A ... |
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| Topic: WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE |
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| mcpublic Replies: 22 Views: 164802 |
Forum: Code Library Posted: Fri Feb 10, 2006 11:09 pm Subject: Re: Porting to 18F2525/4525 |
| Yes, this is the right table of register addresses.
Let me know if you have any more questions. FYI, almost every problem I ran into was solved by adding delays between i2c master commands. |
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| Topic: WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE |
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| mcpublic Replies: 22 Views: 164802 |
Forum: Code Library Posted: Tue Feb 07, 2006 8:01 am Subject: Porting to 18F2525/4525 |
| I do have an update for the 18F2525/4525. I'm sure you can read the datasheet to get the 18F SSP register addresses.
The key difference between the 876A SSP module wrt i2c slave is that addresses ... |
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| Topic: WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE |
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| mcpublic Replies: 22 Views: 164802 |
Forum: Code Library Posted: Tue Nov 01, 2005 1:30 pm Subject: Advice on porting i2c master slave example |
| Snibbe's "WORKING I2C MASTER AND SLAVE LOGGER : MULTI-BYTE" works great at 20MHz, but at slower clock speeds, you have to do one of the following:
a) Master: insert delay after i2c_write(SLAVE_ADDR ... |
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