topic MMA8541 driver for Linux 3.2? in Sensors https://community.nxp.com/t5/Sensors/MMA8541-driver-for-Linux-3-2/m-p/489071#M2954 <HTML><HEAD></HEAD><BODY><P>Hi, is there a MMA8541 driver for linux 3.2? In the support section, I only see one for 2.6.35</P><P></P><P>I've been trying to write a simple test program by following some examples, but whenever I try to read back any register, all I get is 0xFF. I have no problems talking to some other chips on the same i2c bus (rtc), so I think the problem has to do with the repeated-start.</P><P></P><P>Or, I could just compile in the driver and access it through that.</P><P></P><P>Thanks for the help!</P></BODY></HTML> Tue, 03 Feb 2026 22:50:25 GMT clappe 2026-02-03T22:50:25Z MMA8541 driver for Linux 3.2? https://community.nxp.com/t5/Sensors/MMA8541-driver-for-Linux-3-2/m-p/489071#M2954 <HTML><HEAD></HEAD><BODY><P>Hi, is there a MMA8541 driver for linux 3.2? In the support section, I only see one for 2.6.35</P><P></P><P>I've been trying to write a simple test program by following some examples, but whenever I try to read back any register, all I get is 0xFF. I have no problems talking to some other chips on the same i2c bus (rtc), so I think the problem has to do with the repeated-start.</P><P></P><P>Or, I could just compile in the driver and access it through that.</P><P></P><P>Thanks for the help!</P></BODY></HTML> Tue, 03 Feb 2026 22:50:25 GMT https://community.nxp.com/t5/Sensors/MMA8541-driver-for-Linux-3-2/m-p/489071#M2954 clappe 2026-02-03T22:50:25Z Re: MMA8541 driver for Linux 3.2? https://community.nxp.com/t5/Sensors/MMA8541-driver-for-Linux-3-2/m-p/489072#M2955 <HTML><HEAD></HEAD><BODY><P>Hi Chris,</P><P></P><P>Yes, the MMA8451Q uses a combined I<SUP>2</SUP>C data transfer format and requires a repeated start condition after the second byte (register address).</P><P></P><P>For instance, a single byte read from the WHO_AM_I register 0x0D looks like this (note that it is for the MMA8652FC I have on my desk):</P><P></P><P><span class="lia-inline-image-display-wrapper" image-alt="81392_81392.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/120881i5319DC3D82834506/image-size/large?v=v2&amp;px=999" role="button" title="81392_81392.jpg" alt="81392_81392.jpg" /></span><span class="lia-inline-image-display-wrapper" image-alt="Who_Am_I+register+read.JPG.jpg"><img src="https://community.nxp.com/t5/image/serverpage/image-id/6874i887BB87B667853ED/image-size/large?v=v2&amp;px=999" role="button" title="Who_Am_I+register+read.JPG.jpg" alt="Who_Am_I+register+read.JPG.jpg" /></span></P><P></P><P>Also make sure that you are using a correct 7-bit slave address, which is either 0x1C (SA0 = 0) or 0x1D (SA0 = 1).</P><P></P><P>Regarding Linux drivers, I would let others monitoring this forum comment it.</P><P></P><P>Regards,</P><P>Tomas</P></BODY></HTML> Thu, 17 Dec 2015 09:21:22 GMT https://community.nxp.com/t5/Sensors/MMA8541-driver-for-Linux-3-2/m-p/489072#M2955 TomasVaverka 2015-12-17T09:21:22Z