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NuttX builtin up_udelay function uses BOARD_LOOPSPERMSEC configuration value to determine how many loops need to be done to cause requested delay. This does not match well with AVR DA/DB microcontrollers because the CPU clock frequency is configurable. A board configuration could therefore provide BOARD_LOOPSPERMSEC valid for one frequency but for other frequencies, the user would be required to calibrate the value and would still get incorrect result when changing the clock speed during runtime. This patch therefore implements dynamic architecture-specific up_udelay function which determines current clock settings and infers required loop count from that. New function was tested by simple application that used up_udelay to put delays between printf calls. Signed-off-by: Kerogit <kr.git@kerogit.eu> |
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