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LPC32xx ARM9 with FPU support using GCC

Thomas Kindler

July 21, 2013 16:45

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Hi!

I just finished a port for LPC32xx controllers complete with VFP context saving.

This port is based on the ARM7_LPC23xx code with IRQ handling from the
NXP CDL Library. The VFP support was ported from the ARM_Cortex-R4 port.

The systick is generated using the millisecond timer.

Tasks that wish to use the FPU must call vPortTaskUsesFPU() first.

Have fun,
Thomas Kindler <mail_freertos@t-kindler.de>

GCC_ARM9_LPC32xx.zip

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1 comment

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  Thomas Kindler August 14, 2013 17:51

  Some quick notes:

  1. The VFP9-S must be set up in RunFast mode: 
  http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.ddi0238c/CHDIIHCD.html

  Otherwise, the VFP will throw undefined instruction exceptions for some operations. It's probably best to set this mode in vPortTaskUsesFPU().

  2. vPortTaskUsesFPU could be replaced by an undefined instruction handler that enables VFP context saving on demand.