- Forums
- Product Forums
- General Purpose MicrocontrollersGeneral Purpose Microcontrollers
- i.MX Forumsi.MX Forums
- QorIQ Processing PlatformsQorIQ Processing Platforms
- Identification and SecurityIdentification and Security
- Power ManagementPower Management
- Wireless ConnectivityWireless Connectivity
- RFID / NFCRFID / NFC
- Advanced AnalogAdvanced Analog
- MCX Microcontrollers
- S32G
- S32K
- S32V
- MPC5xxx
- Other NXP Products
- S12 / MagniV Microcontrollers
- Powertrain and Electrification Analog Drivers
- Sensors
- Vybrid Processors
- Digital Signal Controllers
- 8-bit Microcontrollers
- ColdFire/68K Microcontrollers and Processors
- PowerQUICC Processors
- OSBDM and TBDML
- S32M
- S32Z/E
-
- Solution Forums
- Software Forums
- MCUXpresso Software and ToolsMCUXpresso Software and Tools
- CodeWarriorCodeWarrior
- MQX Software SolutionsMQX Software Solutions
- Model-Based Design Toolbox (MBDT)Model-Based Design Toolbox (MBDT)
- FreeMASTER
- eIQ Machine Learning Software
- Embedded Software and Tools Clinic
- S32 SDK
- S32 Design Studio
- GUI Guider
- Zephyr Project
- Voice Technology
- Application Software Packs
- Secure Provisioning SDK (SPSDK)
- Processor Expert Software
- Generative AI & LLMs
-
- Topics
- Mobile Robotics - Drones and RoversMobile Robotics - Drones and Rovers
- NXP Training ContentNXP Training Content
- University ProgramsUniversity Programs
- Rapid IoT
- NXP Designs
- SafeAssure-Community
- OSS Security & Maintenance
- Using Our Community
-
- Cloud Lab Forums
-
- Knowledge Bases
- ARM Microcontrollers
- i.MX Processors
- Identification and Security
- Model-Based Design Toolbox (MBDT)
- QorIQ Processing Platforms
- S32 Automotive Processing Platform
- Wireless Connectivity
- CodeWarrior
- MCUXpresso Suite of Software and Tools
- MQX Software Solutions
- RFID / NFC
- Advanced Analog
-
- NXP Tech Blogs
- Home
- :
- Product Forums
- :
- Sensors
- :
- Can't start MMA6900 accelerometer
Can't start MMA6900 accelerometer
- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi,
I'm using MMA6900KQ accelerometer and can't read acceleration data. I'm using SPI to read it.
First I'm trying to init accelerometer. Here commands which I send via SPI and answers on it:
1) MOSI: 0x1410; MISO: 0xEA00; (Command: Set pointer to Device Status Register; answer: Critical/Reset Exception Response)
2) MOSI: 0x2000; MISO: 0xF281; (Command: DEVSTAT register data read; answer: 2 errors (IDE and DEVRES)
3) MOSI: 0x140E; MISO: 0xEA00; (Command: Set pointer to DEVCTL register; answer: Critical/Reset Exception Response)
4) MOSI: 0x3020; MISO: 0xFA0E; (Command: Register data write, data: Clear Error; answer: Critical/Reset Exception Response)
5) MOSI: 0x1410; MISO: 0xEA00; (Command: Set pointer to Device Status Register; answer: Critical/Reset Exception Response)
6) MOSI: 0x2000; MISO: 0xF680; (Command: DEVSTAT register data read; answer: 1 error (IDE)
And after it I'm trying to read acceleration data. As answer I've got 0x2047 acceleration always.
Help me, please, how to deal with this problem?
Solved! Go to Solution.
TomasVaverka
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi Mikhail,
The sequence for clearing errors looks correct, but we recommend using the soft reset sequence immediately after a power on to prevent issues due with the OTP readout after a power on.
Could you try the sequence below?
MOSI Expected MISO
0x1410 0xEA00
0x2000 0xF601
0x140E 0xEA00 // Set CE bit
0x3020 0xFA0E
0x1410 0x0800 // Read DEVSTAT
0x2000 0x1000
0x140E 0x0800 // Soft Reset
0x3080 0x180E
0x34C0 0x180E
0x3040 0x180E
// Delay 5ms Minimum
0x1410 0xEA00
0x2000 0xF601
0x140E 0xEA00 // Set CE bit
0x3020 0xFA0E
0x1410 0x0800 // Read DEVSTAT
0x2000 0x1000
0x4000 0x3806 // Read X-Axis
0x8000 0x4802 // Read Y-Axis
0x4000 0x380C
0x8000 0x47FE
0x4000 0x280E
0x8000 0x57FC
0x4000 0x280E
0x8000 0x47FE
0x4000 0x280E
0x8000 0x57FC
I hope it helps!
Best regards,
Tomas
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Thank you very much, Tomas! It helped me!
TomasVaverka
- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Report Inappropriate Content
Hi Mikhail,
The sequence for clearing errors looks correct, but we recommend using the soft reset sequence immediately after a power on to prevent issues due with the OTP readout after a power on.
Could you try the sequence below?
MOSI Expected MISO
0x1410 0xEA00
0x2000 0xF601
0x140E 0xEA00 // Set CE bit
0x3020 0xFA0E
0x1410 0x0800 // Read DEVSTAT
0x2000 0x1000
0x140E 0x0800 // Soft Reset
0x3080 0x180E
0x34C0 0x180E
0x3040 0x180E
// Delay 5ms Minimum
0x1410 0xEA00
0x2000 0xF601
0x140E 0xEA00 // Set CE bit
0x3020 0xFA0E
0x1410 0x0800 // Read DEVSTAT
0x2000 0x1000
0x4000 0x3806 // Read X-Axis
0x8000 0x4802 // Read Y-Axis
0x4000 0x380C
0x8000 0x47FE
0x4000 0x280E
0x8000 0x57FC
0x4000 0x280E
0x8000 0x47FE
0x4000 0x280E
0x8000 0x57FC
I hope it helps!
Best regards,
Tomas
