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RoadTest Forum [RoadTest] "Freescale RD3803MMA7660FC Review - Serial Communication"
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  • Replies 17 replies
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  • rd3803mma7660fc
  • freescale
  • accelerometer
  • serial
Related

[RoadTest] "Freescale RD3803MMA7660FC Review - Serial Communication"

espanholito
espanholito over 15 years ago

Hello all,

 

First of all i would like to thank Alistair for giving me this opportunity to test this equipment.

 

I received my kit yesterday, and soon started exploring it.

 

As Xavier CHAZE said in the other discution(http://www.element-14.com/community/message/6561#6561), this kit is compose by three components: a freescale uC, a FTDI USB-serial chip, and the  accelerometer.

 

Also with the kit is some documentation and a cd to install a applications which allows to explore some of the features of the accelerometer, like tilt, shake, tap, and orientation detection.

 

As there are already some reviews on this kit, i decided not to talk about what others have already talk, and start to discover a bit of the kit. First i have installed the freescale application which didn't work on my windows 7 x64:(

I had to install it on a windows xp machine to work.

 

As the kit has a USB-Serial Converter, you can develop your computer applications to "talk" to the freescale uC in order to receive the sensor data. And this was what I have done, first I had to discover the communications parameteres:

 

Baudrate: 38400

Data Bits: 8

Stop Bits: 1

Parity: None

Handshake: None

 

Then, using a serial port monitor I spied the communication beetween the freescale application and the board.

 

In order to start receiving data from the board you have to send a couple of bytes:

 

Hexadecimal:

 

0x20; 0x48; 0x54; 0x31; 0x53; 0x31; 0x41; 0x41; 0x0D

0x20; 0x48; 0x54; 0x31; 0x53; 0x31; 0x41; 0x41; 0x0D

0x20; 0x73; 0x31; 0x41; 0x41; 0x0D

0x20; 0x62; 0x37; 0x41; 0x41; 0x0D

 

As you can see, all the messages start with 0x20 and end with 0x41; 0x41; 0x0D

 

From this point the uC will start to send the accelerometer data. Each message starts with 0x20; 0x43 and ends with 0x41; 0x41; 0x0D

 

Till this point i still haven't time to explore more of the kits commands, but hope to post them here soon.

 

Best Regards,

Marcos

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  • espanholito
    espanholito over 15 years ago

    Hello All,

     

    When I wrote the review i haven´t still visit the freescale page. From what I have read from other members review and from my personal opinion, I agree that the I2C board is a good option for develop accelerometer projects, but the uC board is a waste of mony.

     

    Even with the serial protocol freescale implemented on the uC you still have lot's of limitations if you want to develop your own computer application.

     

    Currently I have been using some microchip development boards and they are mutch better for development, because they give everithing you need. For example the pic24F development tool has a programmer on the own board which allows the user to create its own board application.

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  • espanholito
    espanholito over 15 years ago

    Hello All,

     

    When I wrote the review i haven´t still visit the freescale page. From what I have read from other members review and from my personal opinion, I agree that the I2C board is a good option for develop accelerometer projects, but the uC board is a waste of mony.

     

    Even with the serial protocol freescale implemented on the uC you still have lot's of limitations if you want to develop your own computer application.

     

    Currently I have been using some microchip development boards and they are mutch better for development, because they give everithing you need. For example the pic24F development tool has a programmer on the own board which allows the user to create its own board application.

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