static void read(unsigned char reg, unsigned char * b, unsigned int len) {
unsigned int flags;
RAISE_IPL(flags, PRIO_COMMUNICATION);
while(i2c_master_is_busy(i2c_bus));
i2c_master_transfert_block(i2c_bus, RF_ADDRESS, ®, 1, b, len);
IRQ_ENABLE(flags);
}
void rf_init(int bus) {
unsigned int flags;
unsigned char reg = REG_STATUS;
unsigned char s;
unsigned char ret;
clock_delay_us(5000); // we need to wait until the chip is ready ....
RAISE_IPL(flags, PRIO_COMMUNICATION);
i2c_bus = bus;
// Wait until the bus is idle
while(i2c_master_is_busy(i2c_bus));
// Try to access the chip
ret = i2c_master_transfert_block(i2c_bus, RF_ADDRESS, ®, 1, &s, 1);
if(!ret) {
// FIXME
// Try harder ...
ret = i2c_master_transfert_block(i2c_bus, RF_ADDRESS, ®, 1, &s, 1);
}
IRQ_ENABLE(flags);
if (ret) {
write(REG_CTRL, 3); // Put us in presence detect only
status = RF_PRESENT | RF_LINK_UP;
} else {
status = 0;
}
}
/*---------------------------------------------------------------------------*/
static int
spirit_radio_on(void)
{
PRINTF("Spirit1: on\n");
if(spirit_on == OFF) {
IRQ_DISABLE();
/* ensure we are in READY state as we go from there to Rx */
spirit1_strobe(SPIRIT1_STROBE_READY);
BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_READY, 5 * RTIMER_SECOND/1000);
if(SPIRIT1_STATUS() != SPIRIT1_STATE_READY) {
PRINTF("Spirit1: failed to turn on\n");
panic_ra(4);
return 1;
}
/* now we go to Rx */
spirit1_strobe(SPIRIT1_STROBE_RX);
BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, 5 * RTIMER_SECOND/1000);
if(SPIRIT1_STATUS() != SPIRIT1_STATE_RX) {
PRINTF("Spirit1: failed to enter rx\n");
panic_ra(5);
return 1;
}
/* Enables the mcu to get IRQ from the SPIRIT1 */
IRQ_ENABLE();
spirit_on = ON;
}
return 0;
}
static void write(unsigned char reg, unsigned char b) {
unsigned char buffer[2] = {reg,b};
unsigned int flags;
RAISE_IPL(flags, PRIO_COMMUNICATION);
while(i2c_master_is_busy(i2c_bus));
i2c_master_transfert_block(i2c_bus, RF_ADDRESS, buffer, 2, 0, 0);
IRQ_ENABLE(flags);
}
/*---------------------------------------------------------------------------*/
static int
spirit_radio_channel_clear(void)
{
float rssi_value;
/* Local variable used to memorize the SPIRIT1 state */
uint8_t spirit_state = ON;
PRINTF("CHANNEL CLEAR IN\n");
if(spirit_on == OFF) {
/* Wakes up the SPIRIT1 */
spirit_radio_on();
spirit_state = OFF;
}
/* */
IRQ_DISABLE();
spirit1_strobe(SPIRIT1_STROBE_SABORT);
/* SpiritCmdStrobeSabort();*/
SpiritIrqClearStatus();
IRQ_ENABLE();
{
rtimer_clock_t timeout = RTIMER_NOW() + 5 * RTIMER_SECOND/1000;
do {
SpiritRefreshStatus();
} while((g_xStatus.MC_STATE != MC_STATE_READY) && (RTIMER_NOW() < timeout));
if(RTIMER_NOW() < timeout) {
return 1;
}
}
/* Stores the RSSI value */
rssi_value = SpiritQiGetRssidBm();
/* Puts the SPIRIT1 in its previous state */
if(spirit_state==OFF) {
spirit_radio_off();
} else {
spirit1_strobe(SPIRIT1_STROBE_RX);
/* SpiritCmdStrobeRx();*/
BUSYWAIT_UNTIL(SPIRIT1_STATUS() == SPIRIT1_STATE_RX, 5 * RTIMER_SECOND/1000);
}
PRINTF("CHANNEL CLEAR OUT\n");
/* Checks the RSSI value with the threshold */
if(rssi_value<CCA_THRESHOLD) {
return 0;
} else {
return 1;
}
}
void rf_poll(void) {
unsigned int flags;
RAISE_IPL(flags, PRIO_COMMUNICATION);
if(!(status & RF_PRESENT) || !(status & RF_LINK_UP)) {
// RF not present or activated
if(read_acc) {
read_acc = 0;
mma7660_read_async();
}
} else if(!i2c_master_is_busy(i2c_bus)) {
// Try to read data from the device
i2c_master_start_operations(i2c_bus, i2c_cb, NULL);
}
IRQ_ENABLE(flags);
}
/**
* @brief Puts the SPIRIT1 in READY state.
* @param None
* @retval None
*/
void SpiritSetReadyState(void)
{
PRINTF("READY IN\n");
SpiritIrqClearStatus();
IRQ_DISABLE();
if(SPIRIT1_STATUS() == SPIRIT1_STATE_STANDBY) {
spirit1_strobe(SPIRIT1_STROBE_READY);
/* SpiritCmdStrobeReady();*/
} else if(SPIRIT1_STATUS() == SPIRIT1_STATE_RX) {
spirit1_strobe(SPIRIT1_STROBE_SABORT);
/* SpiritCmdStrobeSabort();*/
SpiritIrqClearStatus();
}
IRQ_ENABLE();
PRINTF("READY OUT\n");
}