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| Search found 18 matches |
| Author | Message |
|---|---|
 Topic: Help using enhanced shockburst for the NRF24L01 |
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| teletype-guy Replies: 15 Views: 48099 |
 Forum: General CCS C Discussion Posted: Thu Apr 04, 2013 6:38 pm Subject: Help using enhanced shockburst for the NRF24L01 |
| Hey Unex:
It is really not that complicated. You have a pic running at 5V and a peripheral (24L01) running at 3.3V. Since the peripheral has 5V-tolerant inputs (no upper clamp diodes on the inp ... |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sun Mar 17, 2013 8:04 pm Subject: hardware -- mixing 5V and 3.3V stuff |
| BTW, there are some 74 series style logic IC's that convert between voltages that are nice if you need them:
SN74LVC2G17DBV dual input->output level converters. Hey Ben: Yeah those are h ... |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sun Mar 17, 2013 10:38 am Subject: hardware -- mixing 5V and 3.3V stuff |
| Hey ttelmah:
Yeah, that's a good little chart for input voltages, though I disagree with the cmos levels a bit. To really study it in detail you have to look at the output level range of the sour ... |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sat Mar 16, 2013 10:53 pm Subject: the bottom-line on 3.3-to-5v conversion |
| Hi Jay:
So I'll have to call you when my ASR33 needs a tweak! I also have M14s, 15s, 28s, 31s, 35s, 43s... I think the sparkfun 5-3V converters are just a mosfet/pullup design, like the app not ... |
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| Topic: Help using enhanced shockburst for the NRF24L01 |
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| teletype-guy Replies: 15 Views: 48099 |
Forum: General CCS C Discussion Posted: Sat Mar 16, 2013 6:39 pm Subject: hardware -- mixing 5V and 3.3V stuff |
| Hey UenX:
Careful with mixing 5V and 3.3V stuff. Check this post I did for you: http://www.ccsinfo.com/forum/viewtopic.php?p=173289#173289 |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sat Mar 16, 2013 6:36 pm Subject: hardware -- mixing 5V and 3.3V stuff (part 3) |
| Part 3:
OK, the first two parts were background detail. Here is what I do for 5V, 3.3V, and conversions: 5V-only systems: HC is ancient now, but it is still an awesome family. Not too fast an ... |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sat Mar 16, 2013 5:56 pm Subject: hardware -- mixing 5V and 3.3V stuff (part 2) |
| Part 2:
Logic levels for "real" cmos are 30% and 70% of VCC. So, at 5V-vcc: max-low and min-high levels are 1.5V and 3.5V at 3.3V-vcc: max-low and min-high levels are 1.0V and 2. ... |
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| Topic: hardware -- mixing 5V and 3.3V stuff |
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| teletype-guy Replies: 13 Views: 26059 |
Forum: General CCS C Discussion Posted: Sat Mar 16, 2013 5:31 pm Subject: hardware -- mixing 5V and 3.3V stuff |
| Part 1:
Hi folks: There does not seem to be a place for hardware topics here (Darren?), so I am sticking this here in case it is of any interest, and also so I can point someone here from another ... |
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| Topic: out of rom |
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| teletype-guy Replies: 13 Views: 17939 |
Forum: General CCS C Discussion Posted: Tue Nov 15, 2005 4:14 pm Subject: out of rom |
| Hi Ringo:
When you uncomment lines, you are also adding the library function code (eg: strcmp) unless you have called it elsewhere. So you are adding much more code than just the call-and-pass-par ... |
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| Topic: How to program PIC16F877A through rs232 |
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| teletype-guy Replies: 9 Views: 24730 |
Forum: General CCS C Discussion Posted: Mon Oct 24, 2005 1:53 pm Subject: How to program PIC16F877A through rs232 |
| I agree with PCM-Programmer. This one has worked for years for me. You burn the bootloader into the pic once, and then use the downloader app from a winblows pc to send the hex file from your ccs co ... | |
| Topic: I2C problems -- not posting as guest this time |
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| teletype-guy Replies: 4 Views: 9130 |
Forum: General CCS C Discussion Posted: Wed Oct 12, 2005 11:32 am Subject: fixed it |
| Hi folks:
I solved my problem. I still believe this is a bug in compiler 3.235. The problem was that as an I2C master in software mode (not using pic i2c hardware), my i2c chips were holding the ... |
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| Topic: I2C problems |
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| teletype-guy Replies: 5 Views: 7422 |
Forum: General CCS C Discussion Posted: Wed Oct 12, 2005 11:29 am Subject: I2C problems |
| Hi folks:
I solved my problem. I still believe this is a bug in compiler 3.235. The problem was that as an I2C master in software mode (not using pic i2c hardware), my i2c chips were holding t ... |
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| Topic: I2C problems |
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| teletype-guy Replies: 5 Views: 7422 |
Forum: General CCS C Discussion Posted: Wed Oct 12, 2005 11:28 am Subject: I2C problems |
| Hi folks:
I solved my problem. I still believe this is a bug in compiler 3.235. The problem was that as an I2C master in software mode (not using pic i2c hardware), my i2c chips were holding t ... |
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| Topic: I2C problems -- not posting as guest this time |
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| teletype-guy Replies: 4 Views: 9130 |
Forum: General CCS C Discussion Posted: Tue Oct 11, 2005 10:15 am Subject: code snippet |
| Hi folks:
Note that the pic does not get stuck -- it is the I2C chip that was being written to that is stuck. This is the code snippet -- it is normally a SLAVE pic (using built-in i2c hardware), ... |
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| Topic: I2C problems -- not posting as guest this time |
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| teletype-guy Replies: 4 Views: 9130 |
Forum: General CCS C Discussion Posted: Tue Oct 11, 2005 10:15 am Subject: code snippet |
| Hi folks:
Note that the pic does not get stuck -- it is the I2C chip that was being written to that is stuck. This is the code snippet -- it is normally a SLAVE pic (using built-in i2c hardware), ... |
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