/**
* @brief Initializes the transceiver main interrupt
*
* This function sets the microcontroller specific registers
* responsible for handling the transceiver interrupts
*
* @param trx_irq_cb Callback function for the given transceiver
* interrupt
*/
void pal_trx_irq_init(FUNC_PTR trx_irq_cb)
{
/*
* The AIC is configured and updated with the mode for generating
* interrupt for IRQ0, which is connected to the transceiver interrupt
* line. Also the interrupt handler is installed for the same.
*/
AIC_CONFIGURE(AT91C_ID_IRQ0,
AT91C_AIC_SRCTYPE_POSITIVE_EDGE,
trx_isr);
/*
* Set the handler function.
* The handler is set before enabling the interrupt to prepare for
* spurious interrupts, that can pop up the moment they are enabled.
*/
irq_hdl_trx = (irq_handler_t)trx_irq_cb;
/* The input capture interrupt of timer is disabled. */
DISABLE_TRX_IRQ();
/*
* The interrupt bit corresponding to the trx interrupt is cleared.
*/
CLEAR_TRX_IRQ();
}
/**
* @brief Initializes the transceiver interrupts
*
* This function sets the microcontroller specific registers
* responsible for handling the transceiver interrupts
*
* @param trx_irq_cb Callback function for the given transceiver
* interrupt
*/
void pal_trx_irq_init(FUNC_PTR trx_irq_cb)
{
/*
* Set the handler function.
* The handler is set before enabling the interrupt to prepare for
* spurious interrupts, that can pop up the moment they are enabled.
*/
irq_hdl_trx = (irq_handler_t)trx_irq_cb;
/* Configure the pin and interrupt */
pal_pio_configure(&pin_radio_irq, PIO_LISTSIZE(pin_radio_irq));
pal_pio_configure_interrupt(&pin_radio_irq, (void ( *)(const pin_t *))trx_isr);
/* Configure the NVIC interrupt */
NVIC_EnableIRQ(PIOB_IRQn);
/*
* The interrupt bit corresponding to the trx interrupt is cleared.
*/
CLEAR_TRX_IRQ();
}
static void generate_rand_seed(void)
{
uint16_t seed = 0;
uint8_t cur_random_val = 0;
set_trx_state(CMD_RX_ON);
/*
* We need to disable TRX IRQs while generating random values in RX_ON,
* we do not want to receive frames at this point of time at all.
*/
ENTER_TRX_REGION();
/*
* The 16-bit random value is generated from various 2-bit random values.
*/
for (uint8_t i = 0; i < 8; i++) {
/* Now we can safely read the 2-bit random number. */
cur_random_val = pal_trx_bit_read(SR_RND_VALUE);
seed = seed << 2;
seed |= cur_random_val;
}
set_trx_state(CMD_FORCE_TRX_OFF);
/*
* Now we need to clear potential pending TRX IRQs and
* enable the TRX IRQs again.
*/
pal_trx_reg_read(RG_IRQ_STATUS);
CLEAR_TRX_IRQ();
LEAVE_TRX_REGION();
/* Set the seed for the random number generator. */
srand(seed);
}
