I2C eating memory

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Clive44
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Joined: Tue Oct 18, 2011 12:35 pm
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I2C eating memory

Post by Clive44 »

Hi

I'm using Flowcode 6 on a PIC16F1827 to read the temperture on an LM75 via I2C.
Just writing a simple routine using the I2C Master has 'eaten 4355 words of memory, but the PIC16F1827 only has 4096.
So it doesn't have enough memory to complile to hex.

Has anyone else seen this? Am I missing something somewhere? Would an upgrade to Flowcode8 help?

Thanks!

Clive
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I2C read temperature experiment 2 stripped down code.fcfx
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Benj
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Re: I2C eating memory

Post by Benj »

Hi Clive,

Might be worth trying the 30-day free trial of Flowcode 8 and seeing if this helps at all. It uses a different compiler and we have come a long way since v6 so is certainly worth a go.

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Bachman
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Re: I2C eating memory

Post by Bachman »

LM35 have only 0.5 °C resolution. Why are you using 0.125 multiplier? Try DS18B20, it has a resolution of 0.0625 °C, what is enough for displaying 0.1 °C precision.

The main problem is the "TempdegC" variable, what is FLOAT. Try to never use FLOAT, you can make some tricks.

From "calculate temperature":

Code: Select all

Temperature = Temperature >> 7
Data = Temperature and 1			//'Data' contains the decimal, LSB of Temperature
Temperature = Temperature >> 1			//cut off decimal from 'Temperature'
LCD_PrintNumber 'Temperature'
LCD_PrintString "."				//decimal point
if data=1 //decimal is 5
LCD_PrintNumber '5'
else
LCD_PrintNumber '0'

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