/**************************************************************************************************
* @fn MRFI_WakeUp
*
* @brief Wake up radio from sleep state.
*
* @param none
*
* @return none
**************************************************************************************************
*/
void MRFI_WakeUp(void)
{
/* if radio is already awake, just ignore wakeup request */
if (!mrfiRadioIsSleeping)
{
return;
}
/* drive CSn low to initiate wakeup */
MRFI_SPI_DRIVE_CSN_LOW();
/* wait for MISO to go high indicating the oscillator is stable */
while (MRFI_SPI_SO_IS_HIGH());
/* wakeup is complete, drive CSn high and continue */
MRFI_SPI_DRIVE_CSN_HIGH();
/*
* The test registers must be restored after sleep for the CC1100 and CC2500 radios.
* This is not required for the CC1101 radio.
*/
#ifndef MRFI_CC1101
mrfiSpiWriteReg( MRFI_CC2500_SPI_REG_TEST2, SMARTRF_SETTING_TEST2 );
mrfiSpiWriteReg( MRFI_CC2500_SPI_REG_TEST1, SMARTRF_SETTING_TEST1 );
mrfiSpiWriteReg( MRFI_CC2500_SPI_REG_TEST0, SMARTRF_SETTING_TEST0 );
#endif
/* clear any residual SYNC pin interrupt and then re-enable SYNC pin interrupts */
MRFI_CLEAR_SYNC_PIN_INT_FLAG();
MRFI_ENABLE_SYNC_PIN_INT();
/* clear sleep flag and enter receive mode */
mrfiRadioIsSleeping = 0;
mrfiSpiCmdStrobe(MRFI_CC2500_SPI_STROBE_SRX);
}
/**************************************************************************************************
* @fn Mrfi_TurnOnRadioPower
*
* @brief Power ON the radio chip.
*
* @param none
*
* @return none
**************************************************************************************************
*/
static void Mrfi_TurnOnRadioPower(void)
{
/* put radio chip into reset */
MRFI_DRIVE_RESETN_PIN_LOW();
/* enable the voltage regulator */
MRFI_DRIVE_VREG_EN_PIN_HIGH();
/* wait for the chip to power up */
Mrfi_DelayUsec(MRFI_VREG_SETTLE_TIME_USECS);
/* release from reset */
MRFI_DRIVE_RESETN_PIN_HIGH();
/* wait for the radio crystal oscillator to stabilize */
MRFI_SPI_SET_CHIP_SELECT_ON();
while (!MRFI_SPI_SO_IS_HIGH());
MRFI_SPI_SET_CHIP_SELECT_OFF();
}
/**************************************************************************************************
* @fn MRFI_Init
*
* @brief Initialize MRFI.
*
* @param none
*
* @return none
**************************************************************************************************
*/
void MRFI_Init(void)
{
/* ------------------------------------------------------------------
* Initialization
* -----------------
*/
/* initialize radio state variables */
mrfiRxFilterEnabled = 0;
mrfiRadioIsSleeping = 0;
mrfiTxActive = 0;
mrfiRxActive = 0;
/* initialize GPIO pins */
MRFI_CONFIG_GDO0_PIN_AS_INPUT();
MRFI_CONFIG_GDO2_PIN_AS_INPUT();
/* initialize SPI */
mrfiSpiInit();
/* ------------------------------------------------------------------
* Radio power-up reset
* ----------------------
*/
MRFI_ASSERT(MRFI_SPI_CSN_IS_HIGH());
/* pulse CSn low then high */
MRFI_SPI_DRIVE_CSN_LOW();
MRFI_DELAY(10);
MRFI_SPI_DRIVE_CSN_HIGH();
/* hold CSn high for at least 40 microseconds */
MRFI_DELAY(100);
/* pull CSn low and wait for SO to go low */
MRFI_SPI_DRIVE_CSN_LOW();
while (MRFI_SPI_SO_IS_HIGH());
/* directly send strobe command - cannot use function as it affects CSn pin */
MRFI_SPI_WRITE_BYTE(MRFI_CC2500_SPI_STROBE_SRES);
MRFI_SPI_WAIT_DONE();
/* wait for SO to go low again, reset is complete at that point */
while (MRFI_SPI_SO_IS_HIGH());
/* return CSn pin to its default high level */
MRFI_SPI_DRIVE_CSN_HIGH();
/* ------------------------------------------------------------------
* Run-time integrity checks
* ---------------------------
*/
/* verify that SPI is working */
#ifdef MRFI_ASSERTS_ARE_ON
#define TEST_VALUE 0xA5
mrfiSpiWriteReg( MRFI_CC2500_SPI_REG_PKTLEN, TEST_VALUE );
MRFI_ASSERT( mrfiSpiReadReg( MRFI_CC2500_SPI_REG_PKTLEN ) == TEST_VALUE ); /* SPI is not responding */
#endif
/* verify the correct radio is installed */
MRFI_ASSERT( mrfiSpiReadReg( MRFI_CC2500_SPI_REG_PARTNUM ) == MRFI_RADIO_PARTNUM); /* incorrect radio specified */
MRFI_ASSERT( mrfiSpiReadReg( MRFI_CC2500_SPI_REG_VERSION ) >= MRFI_RADIO_MIN_VERSION); /* obsolete radio specified */
/* ------------------------------------------------------------------
* Configure radio
* -----------------
*/
/* initialize radio registers */
{
uint8_t i;
for (i=0; i<(sizeof(mrfiRadioCfg)/sizeof(mrfiRadioCfg[0])); i++)
{
mrfiSpiWriteReg(mrfiRadioCfg[i][0], mrfiRadioCfg[i][1]);
}
}
/* send strobe to turn on receiver */
mrfiSpiCmdStrobe(MRFI_CC2500_SPI_STROBE_SRX);
/* ------------------------------------------------------------------
* Configure interrupts
* ----------------------
*/
/*
* Configure and enable the SYNC signal interrupt.
*
* This interrupt is used to indicate receive. The SYNC signal goes
* high when a receive OR a transmit begins. It goes high once the
* sync word is received or transmitted and then goes low again once
* the packet completes.
*/
MRFI_CONFIG_SYNC_PIN_FALLING_EDGE_INT();
MRFI_CLEAR_SYNC_PIN_INT_FLAG();
MRFI_ENABLE_SYNC_PIN_INT();
/* configure PA_PD signal interrupt */
MRFI_CONFIG_PAPD_FALLING_EDGE_INT();
/* enable global interrupts */
BSP_ENABLE_INTERRUPTS();
}
