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| Search found 96 matches |
| Author | Message |
|---|---|
 Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
 Forum: General CCS C Discussion Posted: Tue Feb 21, 2017 2:03 pm Subject: I2C on PIC12F1840 does not work on 3.3V |
| Test program with compiler 5.042:
test.h #include <12F1840.h> #FUSES NOWRT // Program memory not write protected #FUSES INTRC_IO // Internal RC Osc, no CLKOUT #fuses NOWDT ... |
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| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Tue Feb 21, 2017 1:24 am Subject: I2C on PIC12F1840 does not work on 3.3V |
| I will grab some scope shots tonight and try to explain what it is that I see when it stops working.
Why additional pull-ups? Because of the 10k in the Cypress master device. Why not the LF vers ... |
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| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sun Feb 19, 2017 3:18 am Subject: I2C on PIC12F1840 does not work on 3.3V |
| Well, then the Cypress device has 10k pull-ups and the STM device has 1k1 pull-ups. Both devices pull to 3.3V as documented. | |
| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sun Feb 19, 2017 1:56 am Subject: I2C on PIC12F1840 does not work on 3.3V |
| Why not just put an amp meter directly between GND and SDA/SCL? | |
| Topic: Use bytes from array as int16 and int32 |
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| Futterama Replies: 3 Views: 10683 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 3:15 pm Subject: Use bytes from array as int16 and int32 |
| Thanks! | |
| Topic: Use bytes from array as int16 and int32 |
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| Futterama Replies: 3 Views: 10683 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 2:55 pm Subject: Use bytes from array as int16 and int32 |
| Hi,
I receive some chars over RS232 and save those in a byte array. Some of the data is a int16 (2 bytes) and some is a int32 (4 bytes). How can I access the bytes in the array as int16 and i ... |
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| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 2:45 pm Subject: I2C on PIC12F1840 does not work on 3.3V |
| The master is definitely 3.3V, the documentation says so, so does my scope. | |
| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 12:39 pm Subject: I2C on PIC12F1840 does not work on 3.3V |
| The master is either a Cypress MCU or a STM MCU, I have devices with both. I don't know more than this, the devices are too expensive to void warranty by pulling them apart to check. | |
| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 12:10 pm Subject: I2C on PIC12F1840 does not work on 3.3V |
| Hi PCM programmer,
You are correct with the voltage levels, I didn't notice that option for the #use statement. But that still prohibits me from adding pull-up resistors unless I also include a ... |
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| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 8:35 am Subject: I2C on PIC12F1840 does not work on 3.3V |
| Hi temtronic,
Thanks for your reply. The master device is a RC receiver with built-in telemetry system which can be accessed by the I2C connection. I checked the datasheet, all the other peri ... |
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| Topic: I2C on PIC12F1840 does not work on 3.3V |
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| Futterama Replies: 18 Views: 35063 |
Forum: General CCS C Discussion Posted: Sat Feb 18, 2017 7:42 am Subject: I2C on PIC12F1840 does not work on 3.3V |
| Hi,
I have a PIC12F1840 configured as an I2C slave using the I2C hardware on pins RA1 and RA2. The I2C master device runs 3.3V and I2C clock is 100kHz. The master has built-in pull-ups but I don't ... |
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| Topic: CCS handling of int16 in if statement |
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| Futterama Replies: 16 Views: 30238 |
Forum: General CCS C Discussion Posted: Sat Jul 23, 2016 9:01 am Subject: CCS handling of int16 in if statement |
| Followup on this thread. I succeeded in making my code do the loop in exactly the same amount of time +/- 100ns according to my scope.
The way I did it was to clear Timer0 at the very beginning of ... |
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| Topic: CCS handling of int16 in if statement |
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| Futterama Replies: 16 Views: 30238 |
Forum: General CCS C Discussion Posted: Tue Jul 19, 2016 4:23 am Subject: CCS handling of int16 in if statement |
RF_Developer, thanks, I actually already did that, and it will actually fit my code flow better that way  |
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| Topic: CCS handling of int16 in if statement |
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| Futterama Replies: 16 Views: 30238 |
Forum: General CCS C Discussion Posted: Mon Jul 18, 2016 12:27 pm Subject: CCS handling of int16 in if statement |
| Ttelmah, thanks, I will do that.
Now, can we do something similar with the following statement? if((InputPin) && (Some_int8_value > 0)) I think the ASM code ... |
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| Topic: CCS handling of int16 in if statement |
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| Futterama Replies: 16 Views: 30238 |
Forum: General CCS C Discussion Posted: Mon Jul 18, 2016 11:33 am Subject: CCS handling of int16 in if statement |
| Is there a clever way to compare two int16 where the execution
time remains the same regardless of variable content? If you XOR the 16-bit values, the compiler will first XOR the LSB's then XOR th ... |
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