The data manager dynamically allocates relatively small work item blocks
on an as needed basis. It never frees these, instead maintaining then in
a list of available block for reuse when needed. Even if these blocks
are small, the are required at non-deterministic times and can end up
scattered in memory thus causing memory fragmentation. In order to
mitigate this problems work item blocks are allocated in groups of 8 in
contiguous memory to reduce the number of scattered memory allocations.
In reality, based on current usage, rarely will more than one group of 8
be allocated.
As requested here [1], this fixes some of the style errors
introduced with the addition of l3g4200d support to the l3gd20
driver. Gyro orientation is set conditionally for the aerocore
board.
[1] https://github.com/PX4/Firmware/pull/937
Signed-off-by: Ash Charles <ashcharles@gmail.com>
AeroCore uses ttyS0 not ttyS3 as the serial port connected to the GPS.
Now, a board can set GPS_DEFAULT_UART_PORT to override the default setting
in a board-specific fashion.
Signed-off-by: Ash Charles <ashcharles@gmail.com>
The L3G4200D chip is very similar to the L3GD20[H] parts and can use
the same driver with minor adjustments. There are four differences:
* WHO_AM_I register is 0xD3 (not 0xD4 or 0xD7):
- added an extra case to the driver probe
* Sampling rates are marginally different:
- setting sampling rate now depends on the detected chip
* I2C address range is different:
- no changes as the driver doesn't support i2c access
* the L3G4200D has a self-test function:
- no changes---chose not to implement feature in driver
Signed-off-by: Ash Charles <ashcharles@gmail.com>
Based on the work of Andrew Smith [1], add board configuration and device
drivers to support the Gumstix AeroCore (previously Aerodroid) board [2]. The
AeroCore is an autopilot board based on a STM32F427 similar to the FMUv2.
[1] https://github.com/smithandrewc/Firmware
[2] https://store.gumstix.com/index.php/products/585/
Signed-off-by: Ash Charles <ashcharles@gmail.com>
Lorenz Meier
Anton Babushkin
Jean Cyr
Ash Charles
Thomas Gubler
ultrasystem