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common:Define default BOARD_NUMBER_I2C_BUSES and BOARD_I2C_BUS_CLOCK_INIT

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Define the default I2C buss frequncies that are backward compatible
   with the existing code. While allowing it the defaults to be overridden
   by a board config.

   Based on the legacy STM32 code, the I2C buss numbering starts at 1.
   The bus frequency is stored in a 0 based array. If px4_i2cbus_initialize
   returns a valid device, then the _bus-1 will act as the index to the
   busses frequency.

   A board may define BOARD_NUMBER_I2C_BUSES - the number of I2C busses
   it supports* and BOARD_I2C_BUS_CLOCK_INIT to initalize the bus
   clocks for a given busses.

   BOARD_NUMBER_I2C_BUSES - the number of busses including the *highest
                            number bus. If the board has 2 I2C
                            busses I2C1 and I2C3 BOARD_NUMBER_I2C_BUSES
                            would be set to 3

   BOARD_I2C_BUS_CLOCK_INIT - Initalization for the bus frequencies
                              by bus. A call init, with a frequency
                              less then the value used for the
                              Initalization will result in the device
                              not starting becuase the buss runs too
                              fast for it.
This commit is contained in:
David Sidrane
2017-08-08 21:45:01 +02:00
committed by Lorenz Meier
parent 9a21969189
commit 9644f855e3
2 changed files with 27 additions and 2 deletions
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src/platforms/posix/include/system_config.h
+1 -1
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@@ -51,7 +51,7 @@
#define PX4_SIM_BUS_TEST 2
#define PX4_I2C_BUS_EXPANSION 3
#define PX4_I2C_BUS_LED 3
#define PX4_NUMBER_I2C_BUSES 3
#define PX4_I2C_OBDEV_LED 0x55
#define SIM_FORMATED_UUID "000000010000000200000003"