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Renesas RX with HEW

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(12-13) The Renesas RX compiler requires this unusual syntax to define the inline assembly function

set

_psw_i()

4.3 The Board Support Package for the “Vanilla” Port

The Board Support Package (BSP) for a QP application implements the board initialization, ISRs, QP

callback functions, and application-specific board-specific functions. The whole BSP is located in the file

bsp.c

in the directory

qpc\examples\rx\vanilla\renesas\dpp-yrdkrx62n\

4.3.1 Interrupt Service Routines (ISRs) for the “Vanilla” kernel

As mentioned earlier, the Renesas compiler enables the user to write ISRs as interrupt functions in C/C+

+. These compiler-generated ISRs are perfectly adequate for the non-preemptive Vanilla kernel.

Listing 6: Tick timer ISR for the Vanilla kernel in intprog.c

(1) #include "vect.h"

(2) #pragma section IntPRG

. . .

(3) void Excep_CMTU0_CMT0(void) {

(4) QF_ISR_ENTRY(); /* inform the QF Vanilla kernel about entering the ISR */

(5) #ifdef Q_SPY

(6) l_tickTime_ += l_tickPeriod_; /* account for the clock rollover */

#endif

(7) QF_TICK(&l_tickISR); /* process all armed time events */

(8) QF_ISR_EXIT(); /* inform the QF vanilla kernel about exiting the ISR */

}

(1) The header file

vect.h

provides declarations of all possible interrupt functions.

(2) All ISRs must be placed in the

IntPRG

section.

(3) The ISR must be one of the

#pragma interrupt

functions declared in the

vect.h

header file.

(4) The macro

QF_ISR_ENTRY()

leaves the critical section established automatically by the RX

hardware upon the entry to the interrupt. This allows calling the QP services (such as

QF_TICK()

)

outside the critical section.

(5) This code is conditionally compiled into the build when the macro Q_SPY is defined. When using

QS the variable

l_tickTime_

keeps track of how many have elapsed so far. At the time an actual

time-stamp is needed, the free running counter is added to this value to get a high resolution 32-bit

time-stamp.

(6) The macro

QF_TICK()

is used to notify the framework about another clock tick. This allows the

framework to perform time-event management activities. This call may result in one or more events

being posted to active objects which had started timers. The parameter to

QF_TICK()

is only used

when tracing with QSPY, otherwise it is ignored.

(7) The macro

QF_ISR_EXIT()

re-establishes again the critical section by restoring PSW[I] to the value

it was upon first entering the ISR.

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