Project:HM55B: Difference between revisions
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== | == About the module == | ||
$20-25 compass module for embedded systems. SMD will be cheaper. | $20-25 compass module for embedded systems. SMD will be cheaper. | ||
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== Testing with the BusPirate == | |||
Settings: | |||
* M (mode) | * '''M''' (mode) | ||
* 8 (3-wire raw) | * '''8''' (3-wire raw) | ||
* 4 (400KHz) | * '''4''' (400KHz) | ||
* 2 (3.3V high) | * '''2''' (3.3V high) | ||
* W (turn on 5V output) | * '''W''' (turn on 5V output) | ||
Reset | === Reset=== | ||
\[/_\/_\/_\/_\&:10] | \[/_\/_\/_\/_\&:10] | ||
The delay may not be needed. | The delay may not be needed. | ||
Take sample | === Take sample === | ||
1100 is the response for success, 00xx is for incomplete, xx11 is error, see p9 of datasheet) | |||
\[/-\/_\/_\/_\&&]&:10[&:10/-\/-\/_\/_\!!!!&!!!!!!!!!!!&!!!!!!!!!!!] | \[/-\/_\/_\/_\&&]&:10[&:10/-\/-\/_\/_\!!!!&!!!!!!!!!!!&!!!!!!!!!!!] | ||
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[0b1000 && ]&[& 0b1100 r:4] | [0b1000 && ]&[& 0b1100 r:4] | ||
Sample readings: | |||
Sample | |||
0,-6 | 0,-6 | ||
Revision as of 00:15, 3 September 2010
About the module
$20-25 compass module for embedded systems. SMD will be cheaper.
Testing with the BusPirate
Settings:
- M (mode)
- 8 (3-wire raw)
- 4 (400KHz)
- 2 (3.3V high)
- W (turn on 5V output)
Reset
\[/_\/_\/_\/_\&:10]
The delay may not be needed.
Take sample
1100 is the response for success, 00xx is for incomplete, xx11 is error, see p9 of datasheet)
\[/-\/_\/_\/_\&&]&:10[&:10/-\/-\/_\/_\!!!!&!!!!!!!!!!!&!!!!!!!!!!!]
READ BIT: 1 READ BIT: 1 READ BIT: 0 READ BIT: 0 DELAY 0b00000001uS READ BIT: 0 READ BIT: 0 READ BIT: 0 READ BIT: 0 READ BIT: 0 READ BIT: 0 READ BIT: 1 READ BIT: 0 READ BIT: 0 READ BIT: 0 READ BIT: 0 DELAY 0b00000001uS READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 1 READ BIT: 0 READ BIT: 0
Note that &:50000 isn't enough of a delay, but && works, presumably because BusPirate parser adds a huge delay. This means that we don't know how fast this module can be clocked, because each ! will be > 50ms apart.
The BusPirate wiki suggests this will work (since we've determined that it still provides the 22 sample bits even if the reading is incomplete):
\[0b0000 &] [0b1000 && ]&[& 0b1100 r:4]
Sample readings:
0,-6
-1,-11
-1,-19
