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Forum Index : Microcontroller and PC projects : DM I2C LSM303DLM
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| jlder Newbie  Joined: 30/09/2012 Location: FrancePosts: 2 |
I am trying to connect to an LSM303DLM which is on a 9DOF Drotek board using I2C with a DM eMega. Up to known I have had zero luck. I connected the external board to UEXT 1 for Vdd, 2 for GND, 5 for clock and 6 for data. I used the following code to: - initialize I2C - set the chipo to 30 Hz - set the gain for 1.3 Gauss - set the continuous mode - and read the 6 byte to get the 3 axis. I test MM.I2C after each I2C instruction and get a nack every time. What is strange is that I also get nack when ecternal board is not powered. Any advise on what I am doing wrong? Thanks, JLD Here is the code (line numbers are supposed to go every 10). MAGXH=0 MAGXL=0 MAGYH=0 MAGYL=0 MAGZH=0 MAGZL=0 I2CEN 100,100 'enable I2C I2CSEND &H1E, 1, 2, &H00, &H14 'ODR to 30 Hz ? "0=ok 1=nack 2=timeout"; MM.I2C I2CSEND &H1E, 1, 2, &H01, &H20 'Gain for 1.3 Gauss ? "0=ok 1=nack 2=timeout"; MM.I2C I2CSEND &H1E, 1, 2, &H02, &H00 'Continuous mode ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGXH, 1, &H03 'read X high ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGXL, 1, &H04 'read X low ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGYH, 1, &H05 'read Y high ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGYL, 1, &H06 'read Y low ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGZH, 1, &H07 'read Z high ? "0=ok 1=nack 2=timeout"; MM.I2C I2CRCV &H1E, 1, 1, MAGZL, 1, &H08 'read Z low ? "0=ok 1=nack 2=timeout"; MM.I2C PRINT "X ="; HEX$(MAGXH*256+MAGXL); TAB(10); PRINT "Y ="; HEX$(MAGYH*256+MAGYL); TAB(20); PRINT "Z ="; HEX$(MAGZH*256+MAGZL) IF INKEY$ <> "" THEN 320 'end if key is pressed PAUSE 300 'wait a little GOTO 140 'read and print again I2CDIS |
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BobD Guru  Joined: 07/12/2011 Location: AustraliaPosts: 935 |
You should have a read of this http://www.pololu.com/catalog/product/1273 especially the part about addresses and Protocol Hints. |
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