//-------------------------------------------------------------------
// Filename: hal_rf_util.c
// Description: Support for anergy detection applications.
//-------------------------------------------------------------------
//-------------------------------------------------------------------
// INCLUDES
//-------------------------------------------------------------------
#include "hal_defs.h"
#include "hal_mcu.h"
#include "hal_rf_util.h"
#include "hal_rf.h"

//-------------------------------------------------------------------
// FUNCTIONS
//-------------------------------------------------------------------
//-------------------------------------------------------------------
// @fn          halSampleED
// @brief      Sample Energy Detect
// @param      uint8 channel - channel between 11 and 26
//             uint16 sampleTime - sample time in us
// @return     int8 - sampled RSSI value      
//-------------------------------------------------------------------
int8 halSampleED(uint8 channel, uint16 sampleTime)
{
    int8 rssi = 0;

    // Set channel
    halRfSetChannel(channel);

    // Set RX on
    halRfReceiveOn();
    while (!RSSISTAT)
        ;

    // Enable energy scan mode, using peak signal strength
    FRMCTRL0 |= 0x10;

    // Spend sampleTime us accumulating the peak RSSI value
    halMcuWaitUs(sampleTime);
    rssi = RSSI;

    // Exit the current channel
    halRfReceiveOff();
    // Disable ED scan mode
    FRMCTRL0 &= ~0x10;

    return rssi;
}

//-------------------------------------------------------------------
// @fn          halSetRxScanMode
// @brief       Set chip in RX scanning mode
// @param       none 
// @return     none
//-------------------------------------------------------------------
void halSetRxScanMode(void)
{
    // Infinite RX mode (disables symbol search)
    FRMCTRL0 = 0x0C;
}