warzon
Member
Hello,
I want to use LSM303DLH digital compass in my project. I've connected it to my maple
r5 board directly with sda 9 and scl 5 ( i tried with or withour resistors ). And found in your source code Wire library. This compass has support for Arduino (https://github.com/ryantm/LSM303DLH) , that also uses Wire (i mean in arduino). And it seams to me that code must transparently work on maple. But it did not.
I will be very pleased if you help me solve this problem.
The IO of the LSM303DLH is 1.8v is not 3.3v tolerant, although I do believe the maple when using I2C sets the pins to open drain which means this isn't an issue. The Wire library included with the Maple IDE is software based, and uses pins 20 (SDA) and 21 (SCL). To use the hardware I2C, use this Wire implementation for the time being with MapleIDE v0.0.11: http://www.crennsmind.com/Code/Maple/Wire-Snapshot-110913.zip
warzon
Member
Great Thanks! Forget to wrote that i use breakout board from pololu with shifted levels. It's working with arduino mega perfectly. Your information is very important and i hope that it helps.
I don't use IDE's and compile my code in terminal, it's more comfortable for me.
I'll write tomorrow about my experience.
poslathian
LeafLabs
warzon,
While the Wire library *should* be working, you might like to use the lower level hardware i2c library. This is the libmaple native way of doing i2c, as opposed to Arduino's c++ Wirish way.
Here is an example of a sketch that initializes and reads from an ADXL345 accelerometer over i2c. Please note that because this uses the i2c hardware, you MUST use one of the i2c banks. On Maple r5 these are I2C1 or I2C2. In the sketch I am using I2C2 which is pins 0 and 1.
warzon
Member
crenn -
It's not working. Function TwoWire::available() always zero and while(Wire.available() < 6) never ending. Maybe it's not correct, i don't know. I will try to use more low level i2c.
poslathian -
On my board I2C1- sda: 9 , scl: 5; I2C2 - sda: 29, scl: 30; Pins 0 and 1 is RX2 and TX2.
I know about low level api for i2c, but i'm only want to save time. Not writing another peace of software already written.
It's strange, why i can't use library? If functions in class TwoWire working as functions in the same class in Arduino, all classes that uses TwoWire must work! If these classes are not equal, then you must change name of your TwoWire class to some other name. Because it's leads to great misunderstanding.
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