mirror of
https://github.com/RIOT-OS/RIOT.git
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330 lines
8.9 KiB
C
330 lines
8.9 KiB
C
#include <cc1100.h>
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#include <cc1100-arch.h>
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#include <cc1100-config.h>
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#include <cc1100-defaultSettings.h>
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#include <cc1100-internal.h>
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#include <cc1100_spi.h>
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#include <transceiver.h>
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#include <hwtimer.h>
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#define RX_BUF_SIZE (10)
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/* some externals */
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extern uint8_t pa_table[]; ///< PATABLE with available output powers
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extern uint8_t pa_table_index; ///< Current PATABLE Index
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/* global variables */
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rx_buffer_t cc1100_rx_buffer[RX_BUF_SIZE]; ///< RX buffer
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cc1100_statistic_t cc1100_statistic;
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volatile cc1100_flags rflags; ///< Radio control flags
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volatile uint8_t radio_state = RADIO_UNKNOWN; ///< Radio state
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volatile uint8_t cc1100_rx_buffer_next; ///< Next packet in RX queue
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static uint8_t radio_address; ///< Radio address
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static uint8_t radio_channel; ///< Radio channel
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/**
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* @brief Last sequence number this node has seen
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*
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* @note (phySrc + flags.identification) - for speedup in ISR.
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*/
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static volatile uint16_t last_seq_num = 0;
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/* internal function prototypes */
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static uint8_t receive_packet_variable(uint8_t *rxBuffer, uint8_t length);
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static uint8_t receive_packet(uint8_t *rxBuffer, uint8_t length);
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static void reset(void);
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static void power_up_reset(void);
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static void write_register(uint8_t r, uint8_t value);
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/*---------------------------------------------------------------------------*/
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// Radio Driver API
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/*---------------------------------------------------------------------------*/
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void cc1100_init(void) {
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cc1100_rx_buffer_next = 0;
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/* Initialize SPI */
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cc1100_spi_init();
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/* Load driver & reset */
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power_up_reset();
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/* Write configuration to configuration registers */
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cc1100_spi_writeburst_reg(0x00, cc1100_conf, CC1100_CONF_SIZE);
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/* Write PATABLE (power settings) */
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cc1100_spi_write_reg(CC1100_PATABLE, pa_table[pa_table_index]);
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/* Initialize Radio Flags */
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rflags.RSSI = 0x00;
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rflags.LL_ACK = 0;
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rflags.CAA = 0;
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rflags.CRC = 0;
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rflags.SEQ = 0;
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rflags.MAN_WOR = 0;
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rflags.KT_RES_ERR = 0;
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rflags.TX = 0;
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rflags.WOR_RST = 0;
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/* Set default channel number */
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radio_channel = CC1100_DEFAULT_CHANNR;
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}
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void cc1100_disable_interrupts(void) {
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cc1100_gdo2_disable();
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cc1100_gdo0_disable();
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}
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void cc1100_gdo0_irq(void) {
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// Air was not free -> Clear CCA flag
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rflags.CAA = false;
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// Disable carrier sense detection (GDO0 interrupt)
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cc1100_gdo0_disable();
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}
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void cc1100_gdo2_irq(void) {
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cc1100_rx_handler();
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}
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void cc1100_rx_handler(void) {
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uint8_t res = 0;
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// Possible packet received, RX -> IDLE (0.1 us)
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rflags.CAA = 0;
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rflags.MAN_WOR = 0;
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cc1100_statistic.packets_in++;
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res = receive_packet((uint8_t*)&(rx_buffer[cc1100_rx_buffer_next].packet), sizeof(cc1100_packet_t));
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if (res)
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{
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// If we are sending a burst, don't accept packets.
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// Only ACKs are processed (for stopping the burst).
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// Same if state machine is in TX lock.
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if (radio_state == RADIO_SEND_BURST || rflags.TX)
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{
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cc1100_statistic.packets_in_while_tx++;
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return;
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}
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rx_buffer[cc1100_rx_buffer_next].info.rssi = rflags.RSSI;
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rx_buffer[cc1100_rx_buffer_next].info.lqi = rflags.LQI;
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// Valid packet. After a wake-up, the radio should be in IDLE.
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// So put CC1100 to RX for WOR_TIMEOUT (have to manually put
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// the radio back to sleep/WOR).
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cc1100_spi_write_reg(CC1100_MCSM0, 0x08); // Turn off FS-Autocal
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cc1100_spi_write_reg(CC1100_MCSM2, 0x07); // Configure RX_TIME (until end of packet)
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cc1100_spi_strobe(CC1100_SRX);
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hwtimer_wait(IDLE_TO_RX_TIME);
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radio_state = RADIO_RX;
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if (++cc1100_rx_buffer_next == RX_BUF_SIZE) {
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cc1100_rx_buffer_next = 0;
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}
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msg m;
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m.type = RCV_PKT;
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m.content = NULL;
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msg_send_int(m, transceiver_pid);
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return;
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}
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else
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{
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// No ACK received so TOF is unpredictable
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rflags.TOF = 0;
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// CRC false or RX buffer full -> clear RX FIFO in both cases
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last_seq_num = 0; // Reset for correct burst detection
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cc1100_spi_strobe(CC1100_SIDLE); // Switch to IDLE (should already be)...
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cc1100_spi_strobe(CC1100_SFRX); // ...for flushing the RX FIFO
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// If packet interrupted this nodes send call,
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// don't change anything after this point.
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if (radio_state == RADIO_AIR_FREE_WAITING)
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{
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cc1100_spi_strobe(CC1100_SRX);
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hwtimer_wait(IDLE_TO_RX_TIME);
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return;
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}
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// If currently sending, exit here (don't go to RX/WOR)
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if (radio_state == RADIO_SEND_BURST)
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{
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cc1100_statistic.packets_in_while_tx++;
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return;
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}
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// No valid packet, so go back to RX/WOR as soon as possible
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cc1100_switch_to_rx();
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}
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}
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uint8_t cc1100_set_address(radio_address_t address) {
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if ((address < MIN_UID) || (address > MAX_UID)) {
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return 0;
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}
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uint8_t id = (uint8_t) address;
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if (radio_state != RADIO_UNKNOWN) {
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write_register(CC1100_ADDR, id);
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}
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radio_address = id;
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return 0;
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}
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void cc1100_setup_rx_mode(void) {
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// Stay in RX mode until end of packet
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cc1100_spi_write_reg(CC1100_MCSM2, 0x07);
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cc1100_switch_to_rx();
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}
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void cc1100_switch_to_rx(void) {
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radio_state = RADIO_RX;
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cc1100_spi_strobe(CC1100_SRX);
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}
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void cc1100_wakeup_from_rx(void) {
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if (radio_state != RADIO_RX) return;
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cc1100_spi_strobe(CC1100_SIDLE);
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radio_state = RADIO_IDLE;
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}
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void switch_to_pwd(void) {
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cc1100_wakeup_from_rx();
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cc1100_spi_strobe(CC1100_SPWD);
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radio_state = RADIO_PWD;
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}
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/*---------------------------------------------------------------------------*/
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/* Internal functions */
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/*---------------------------------------------------------------------------*/
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static uint8_t receive_packet_variable(uint8_t *rxBuffer, uint8_t length) {
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uint8_t status[2];
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uint8_t packetLength = 0;
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/* Any bytes available in RX FIFO? */
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if ((cc1100_spi_read_status(CC1100_RXBYTES) & BYTES_IN_RXFIFO))
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{
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// Read length byte (first byte in RX FIFO)
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packetLength = cc1100_spi_read_reg(CC1100_RXFIFO);
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// Read data from RX FIFO and store in rxBuffer
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if (packetLength <= length)
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{
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// Put length byte at first position in RX Buffer
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rxBuffer[0] = packetLength;
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// Read the rest of the packet
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cc1100_spi_readburst_reg(CC1100_RXFIFO, (char*)rxBuffer+1, packetLength);
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// Read the 2 appended status bytes (status[0] = RSSI, status[1] = LQI)
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cc1100_spi_readburst_reg(CC1100_RXFIFO, (char*)status, 2);
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// Store RSSI value of packet
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rflags.RSSI = status[I_RSSI];
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// MSB of LQI is the CRC_OK bit
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rflags.CRC = (status[I_LQI] & CRC_OK) >> 7;
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if (!rflags.CRC) {
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cc1100_statistic.packets_in_crc_fail++;
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}
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// Bit 0-6 of LQI indicates the link quality (LQI)
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rflags.LQI = status[I_LQI] & LQI_EST;
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return rflags.CRC;
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}
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/* too many bytes in FIFO */
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else {
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// RX FIFO get automatically flushed if return value is false
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return 0;
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}
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}
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/* no bytes in RX FIFO */
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else {
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// RX FIFO get automatically flushed if return value is false
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return 0;
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}
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}
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static uint8_t receive_packet(uint8_t *rxBuffer, uint8_t length) {
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uint8_t pkt_len_cfg = cc1100_spi_read_reg(CC1100_PKTCTRL0) & PKT_LENGTH_CONFIG;
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if (pkt_len_cfg == VARIABLE_PKTLEN)
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{
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return receive_packet_variable(rxBuffer, length);
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}
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// Fixed packet length not supported.
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// RX FIFO get automatically flushed if return value is false
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return 0;
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}
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/*---------------------------------------------------------------------------*/
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// CC1100 reset functionality
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/*---------------------------------------------------------------------------*/
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static void reset(void) {
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cc1100_wakeup_from_rx();
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cc1100_spi_select();
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cc1100_spi_strobe(CC1100_SRES);
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hwtimer_wait(RTIMER_TICKS(10));
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}
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static void power_up_reset(void) {
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cc1100_spi_unselect();
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cc1100_spi_cs();
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cc1100_spi_unselect();
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hwtimer_wait(RESET_WAIT_TIME);
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reset();
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radio_state = RADIO_IDLE;
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}
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static void write_register(uint8_t r, uint8_t value) {
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// Save old radio state
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uint8_t old_state = radio_state;
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/* Wake up from WOR/RX (if in WOR/RX, else no effect) */
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cc1100_wakeup_from_rx();
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cc1100_spi_write_reg(r, value);
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// Have to put radio back to WOR/RX if old radio state
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// was WOR/RX, otherwise no action is necessary
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if ((old_state == RADIO_WOR) || (old_state == RADIO_RX)) {
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cc1100_switch_to_rx();
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}
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}
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static int rd_set_mode(int mode) {
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int result;
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// Get current radio mode
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if ((radio_state == RADIO_UNKNOWN) || (radio_state == RADIO_PWD)) {
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result = RADIO_MODE_OFF;
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}
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else {
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result = RADIO_MODE_ON;
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}
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switch (mode) {
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case RADIO_MODE_ON:
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cc1100_init_interrupts(); // Enable interrupts
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cc1100_setup_rx_mode(); // Set chip to desired mode
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break;
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case RADIO_MODE_OFF:
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cc1100_disable_interrupts(); // Disable interrupts
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cc1100_switch_to_pwd(); // Set chip to power down mode
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break;
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case RADIO_MODE_GET:
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// do nothing, just return current mode
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default:
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// do nothing
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break;
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}
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// Return previous mode
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return result;
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}
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