K40 FOR IAR

[WayneChung]

I use the IAR ARM sample example,

when i set "GPIOC_PSOR = 1" ,

the Register will set to "GPIOC_PDORC = 1" .

[mjbcswitzerland]

Hi

This sounds to be normal operation. GPIOC_PSOR is the Set Output Register, causing the bit with '1' to be set to the output; the register itself always reads 0.

Since the write set the bit in the output, this is seen in the GPIOC_PDORC register.

By contrast, if you write "GPIOC_PCOR = 1" it will then clear the bit in the GPIOC_PDORC register.

Furthermore "GPIOC_PTOR = 1" will toggle the bit.

Regards

Mark