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95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/*
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* Copyright (C) 2009 Freie Universität Berlin
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* Copyright (C) 2013 INRIA
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*
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* This file is subject to the terms and conditions of the GNU Lesser
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* General Public License v2.1. See the file LICENSE in the top level
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* directory for more details.
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*/
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/**
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* @ingroup drivers_cc110x_legacy
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* @{
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* @file cc110x-tx.c
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* @brief Functions for packet transmission on cc110x
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*
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* @author Oliver Hahm <oliver.hahm@inria.fr>
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* @}
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*/
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#include <stdio.h>
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#include "cc110x_legacy.h"
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#include "cc110x-internal.h"
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#include "irq.h"
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int8_t cc110x_send(cc110x_packet_t *packet)
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{
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volatile uint32_t abort_count;
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uint8_t size;
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/* TODO: burst sending */
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radio_state = RADIO_SEND_BURST;
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rflags.LL_ACK = 0;
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/*
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* Number of bytes to send is:
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* length of phy payload (packet->length)
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* + size of length field (1 byte)
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*/
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size = packet->length + 1;
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/* The number of bytes to be transmitted must be smaller
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* or equal to PACKET_LENGTH (62 bytes). So the receiver
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* can put the whole packet in its RX-FIFO (with appended
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* packet status bytes).*/
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if (size > PACKET_LENGTH) {
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return 0;
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}
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packet->phy_src = cc110x_get_address();
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/* Disables RX interrupt etc. */
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cc110x_before_send();
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/* But CC1100 in IDLE mode to flush the FIFO */
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cc110x_strobe(CC1100_SIDLE);
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/* Flush TX FIFO to be sure it is empty */
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cc110x_strobe(CC1100_SFTX);
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/* Write packet into TX FIFO */
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cc110x_writeburst_reg(CC1100_TXFIFO, (char *) packet, size);
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/* Switch to TX mode */
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abort_count = 0;
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unsigned int cpsr = disableIRQ();
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cc110x_strobe(CC1100_STX);
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/* Wait for GDO2 to be set -> sync word transmitted */
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while (cc110x_get_gdo2() == 0) {
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abort_count++;
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if (abort_count > CC1100_SYNC_WORD_TX_TIME) {
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/* Abort waiting. CC1100 maybe in wrong mode */
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/* e.g. sending preambles for always */
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puts("[CC1100 TX] fatal error\n");
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break;
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}
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}
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restoreIRQ(cpsr);
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/* Wait for GDO2 to be cleared -> end of packet */
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while (cc110x_get_gdo2() != 0);
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/* Experimental - TOF Measurement */
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cc110x_after_send();
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cc110x_statistic.raw_packets_out++;
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/* Store number of transmission retries */
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rflags.TX = 0;
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/* Go to mode after TX (CONST_RX -> RX, WOR -> WOR) */
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cc110x_switch_to_rx();
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return size;
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}
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