Hallo all,
I am new to eCos(and also to embedded). The eCos documentation says that ISR
should not involve any kernel calls.But I want to know why
cyg_semaphore_post() is not allowed in ISR(Interrupt service routine). It
doesnt block. and i tried to use it though documentation says we shouldnt.
It worked for me with the following code.
cyg_uint32 timer_isr(cyg_vector_t vector,cyg_addrword_t data)
{
led_toggle(); //Toggle the LED
isr_counter++; //32 bit ISR counter
cyg_interrupt_acknowledge( vector ); //acknowledge the Interrupt to the
processor
cyg_semaphore_post( &intr_occured ); //give the semaphore,so that task
waiting for it wakes up
return( CYG_ISR_HANDLED ); // Inform the kernel that ISR is
handled
}
I wonder why in eCos,a semaphore cannot be posted in ISR. In VxWorks we can
give a semaphore in ISR. Can anybody give me a pointer to documentation or
an explanation for this.
Thank you in advance
monica
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