TivaCpuLoad.hxx

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#ifndef _FREERTOS_DRIVERS_TI_TIVACPULOAD_HXX_
#define _FREERTOS_DRIVERS_TI_TIVACPULOAD_HXX_
 
#include "driverlib/timer.h"
#include "driverlib/interrupt.h"
#include "inc/hw_ints.h"
#include "freertos_drivers/common/CpuLoad.hxx"
 
struct TivaCpuLoadDefHw
{
    static constexpr auto TIMER_BASE = TIMER4_BASE;
    static constexpr unsigned TIMER = TIMER_A;
    static constexpr auto TIMER_PERIPH = SYSCTL_PERIPH_TIMER4;
    static constexpr auto TIMER_INTERRUPT = INT_TIMER4A;
    static constexpr unsigned TIMER_PERIOD = 80000000 / 127;
};
 
template<class HW>
class TivaCpuLoad {
public:
    TivaCpuLoad() {
        setup();
    }
 
    static void setup()
    {
        MAP_SysCtlPeripheralEnable(HW::TIMER_PERIPH);
        MAP_TimerDisable(HW::TIMER_BASE, HW::TIMER);
        MAP_TimerClockSourceSet(HW::TIMER_BASE, TIMER_CLOCK_SYSTEM);
        MAP_TimerConfigure(HW::TIMER_BASE, TIMER_CFG_PERIODIC);
 
        MAP_TimerLoadSet(HW::TIMER_BASE, HW::TIMER, HW::TIMER_PERIOD);
 
        MAP_IntDisable(HW::TIMER_INTERRUPT);
        // We interrupt all other interrupts in order to ensure we measure
        // correct cpu usage.
        MAP_IntPrioritySet(HW::TIMER_INTERRUPT, 0);
        MAP_TimerIntEnable(HW::TIMER_BASE, TIMER_TIMA_TIMEOUT);
        MAP_TimerEnable(HW::TIMER_BASE, HW::TIMER);
        MAP_IntEnable(HW::TIMER_INTERRUPT);
    }
 
    void interrupt_handler(unsigned p)
    {
        MAP_TimerIntClear(HW::TIMER_BASE, TIMER_TIMA_TIMEOUT);
        cpuload_tick(p);
    }
 
    CpuLoad load_;
};
 
 
 
#endif  //  _FREERTOS_DRIVERS_TI_TIVACPULOAD_HXX_