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cc1200: added option to separate filling the Tx FIFO from actual transmission

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This commit is contained in:
Simon Duquennoy 2018-10-03 15:15:18 +02:00
parent 0ef1ee6df5
commit b5e12154c4
1 changed files with 87 additions and 57 deletions
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144
arch/dev/cc1200/cc1200.c
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@ -82,6 +82,14 @@ static rtimer_clock_t sfd_timestamp = 0;
#define CC1200_RF_CFG cc1200_802154g_863_870_fsk_50kbps
#endif
#endif
/*
* When set, a software buffer is used to store outgoing packets before copying
* to Tx FIFO. This enabled sending packets larger than the FIFO. When unset,
* no buffer is used; instead, the payload is copied directly to the Tx FIFO.
* This is requried by TSCH, for shorter and more predictable delay in the Tx
* chain. This, however, restircts the payload length to the Tx FIFO size.
*/
#define CC1200_WITH_TX_BUF (!MAC_CONF_WITH_TSCH)
/*
* Set this parameter to 1 in order to use the MARC_STATE register when
* polling the chips's status. Else use the status byte returned when sending
@ -398,10 +406,14 @@ extern const cc1200_rf_cfg_t CC1200_RF_CFG;
/*---------------------------------------------------------------------------*/
/* Flag indicating whether non-interrupt routines are using SPI */
static volatile uint8_t spi_locked = 0;
#if CC1200_WITH_TX_BUF
/* Packet buffer for transmission, filled within prepare() */
static uint8_t tx_pkt[CC1200_MAX_PAYLOAD_LEN];
#endif /* CC1200_WITH_TX_BUF */
/* The number of bytes waiting in tx_pkt */
static uint16_t tx_pkt_len;
/* Number of bytes from tx_pkt left to write to FIFO */
uint16_t bytes_left_to_write;
/* Packet buffer for reception */
static uint8_t rx_pkt[CC1200_MAX_PAYLOAD_LEN + APPENDIX_LEN];
/* The number of bytes placed in rx_pkt */
@ -439,6 +451,9 @@ static struct etimer et;
/* Init the radio. */
static int
init(void);
/* Prepare and copy PHY header to Tx FIFO */
static int
copy_header_to_tx_fifo(unsigned short payload_len);
/* Prepare the radio with a packet to be sent. */
static int
prepare(const void *payload, unsigned short payload_len);
@ -547,7 +562,7 @@ idle_calibrate_rx(void);
/* Restart RX from within RX interrupt. */
static void
rx_rx(void);
/* Fill TX FIFO, start TX and wait for TX to complete (blocking!). */
/* Fill TX FIFO (if not already done), start TX and wait for TX to complete (blocking!). */
static int
idle_tx_rx(const uint8_t *payload, uint16_t payload_len);
/* Update TX power */
@ -739,10 +754,67 @@ prepare(const void *payload, unsigned short payload_len)
}
tx_pkt_len = payload_len;
#if CC1200_WITH_TX_BUF
/* Copy payload to buffer, will be sent later */
memcpy(tx_pkt, payload, tx_pkt_len);
#else /* CC1200_WITH_TX_BUF */
#if (CC1200_MAX_PAYLOAD_LEN > (CC1200_FIFO_SIZE - PHR_LEN))
#error CC1200 max payload too large
#else
/* Copy header and payload directly to Radio Tx FIFO (127 bytes max) */
copy_header_to_tx_fifo(payload_len);
burst_write(CC1200_TXFIFO, payload, payload_len);
#endif
#endif /* CC1200_WITH_TX_BUF */
return RADIO_TX_OK;
}
/*---------------------------------------------------------------------------*/
/* Prepare the radio with a packet to be sent. */
static int
copy_header_to_tx_fifo(unsigned short payload_len)
{
#if CC1200_802154G
/* Prepare PHR for 802.15.4g frames */
struct {
uint8_t phra;
uint8_t phrb;
} phr;
#if CC1200_802154G_CRC16
payload_len += 2;
#else
payload_len += 4;
#endif
/* Frame length */
phr.phrb = (uint8_t)(payload_len & 0x00FF);
phr.phra = (uint8_t)((payload_len >> 8) & 0x0007);
#if CC1200_802154G_WHITENING
/* Enable Whitening */
phr.phra |= (1 << 3);
#endif /* #if CC1200_802154G_WHITENING */
#if CC1200_802154G_CRC16
/* FCS type 1, 2 Byte CRC */
phr.phra |= (1 << 4);
#endif /* #if CC1200_802154G_CRC16 */
#endif /* #if CC1200_802154G */
idle();
rf_flags &= ~RF_RX_PROCESSING_PKT;
strobe(CC1200_SFRX);
/* Flush TX FIFO */
strobe(CC1200_SFTX);
#if CC1200_802154G
/* Write PHR */
burst_write(CC1200_TXFIFO, (uint8_t *)&phr, PHR_LEN);
#else
/* Write length byte */
burst_write(CC1200_TXFIFO, (uint8_t *)&payload_len, PHR_LEN);
#endif /* #if CC1200_802154G */
return 0;
}
/*---------------------------------------------------------------------------*/
/* Send the packet that has previously been prepared. */
@ -752,6 +824,7 @@ transmit(unsigned short transmit_len)
uint8_t was_off = 0;
int ret = RADIO_TX_OK;
int txret;
INFO("RF: Transmit (%d)\n", transmit_len);
@ -807,7 +880,12 @@ transmit(unsigned short transmit_len)
#endif
/* Send data using TX FIFO */
if(idle_tx_rx((const uint8_t *)tx_pkt, tx_pkt_len) == RADIO_TX_OK) {
#if CC1200_WITH_TX_BUF
txret = idle_tx_rx(tx_pkt, tx_pkt_len);
#else /* CC1200_WITH_TX_BUF */
txret = idle_tx_rx(NULL, tx_pkt_len);
#endif /* CC1200_WITH_TX_BUF */
if(txret == RADIO_TX_OK) {
/*
* TXOFF_MODE is set to RX,
@ -1885,75 +1963,25 @@ rx_rx(void)
}
/*---------------------------------------------------------------------------*/
/* Fill TX FIFO, start TX and wait for TX to complete (blocking!). */
/* Fill TX FIFO (if not already done), start TX and wait for TX to complete (blocking!). */
static int
idle_tx_rx(const uint8_t *payload, uint16_t payload_len)
{
#if (CC1200_MAX_PAYLOAD_LEN > (CC1200_FIFO_SIZE - PHR_LEN))
uint16_t bytes_left_to_write;
uint8_t to_write;
const uint8_t *p;
#endif
#if CC1200_802154G
/* Prepare PHR for 802.15.4g frames */
struct {
uint8_t phra;
uint8_t phrb;
} phr;
#if CC1200_802154G_CRC16
payload_len += 2;
#else
payload_len += 4;
#endif
/* Frame length */
phr.phrb = (uint8_t)(payload_len & 0x00FF);
phr.phra = (uint8_t)((payload_len >> 8) & 0x0007);
#if CC1200_802154G_WHITENING
/* Enable Whitening */
phr.phra |= (1 << 3);
#endif /* #if CC1200_802154G_WHITENING */
#if CC1200_802154G_CRC16
/* FCS type 1, 2 Byte CRC */
phr.phra |= (1 << 4);
#endif /* #if CC1200_802154G_CRC16 */
#endif /* #if CC1200_802154G */
/* Prepare for RX */
rf_flags &= ~RF_RX_PROCESSING_PKT;
strobe(CC1200_SFRX);
/* Flush TX FIFO */
strobe(CC1200_SFTX);
#if USE_SFSTXON
/*
* Enable synthesizer. Saves us a few µs especially if it takes
* long enough to fill the FIFO. This strobe must not be
* send before SFTX!
*/
strobe(CC1200_SFSTXON);
#endif
/* Configure GPIO0 to detect TX state */
single_write(CC1200_IOCFG0, CC1200_IOCFG_MARC_2PIN_STATUS_0);
#if (CC1200_MAX_PAYLOAD_LEN > (CC1200_FIFO_SIZE - PHR_LEN))
/*
* We already checked that GPIO2 is used if
* CC1200_MAX_PAYLOAD_LEN > 127 / 126 in the header of this file
*/
single_write(CC1200_IOCFG2, CC1200_IOCFG_TXFIFO_THR);
#endif
#if CC1200_802154G
/* Write PHR */
burst_write(CC1200_TXFIFO, (uint8_t *)&phr, PHR_LEN);
#else
/* Write length byte */
burst_write(CC1200_TXFIFO, (uint8_t *)&payload_len, PHR_LEN);
#endif /* #if CC1200_802154G */
#if CC1200_WITH_TX_BUF
/* Prepare and write header */
copy_header_to_tx_fifo(payload_len);
/*
* Fill FIFO with data. If SPI is slow it might make sense
@ -1970,6 +1998,7 @@ idle_tx_rx(const uint8_t *payload, uint16_t payload_len)
#else
burst_write(CC1200_TXFIFO, payload, payload_len);
#endif
#endif /* CC1200_WITH_TX_BUF */
#if USE_SFSTXON
/* Wait for synthesizer to be ready */
@ -2009,7 +2038,7 @@ idle_tx_rx(const uint8_t *payload, uint16_t payload_len)
}
#if (CC1200_MAX_PAYLOAD_LEN > (CC1200_FIFO_SIZE - PHR_LEN))
#if (CC1200_MAX_PAYLOAD_LEN > (CC1200_FIFO_SIZE - PHR_LEN)) && CC1200_WITH_TX_BUF
if(bytes_left_to_write != 0) {
rtimer_clock_t t0;
uint8_t s;
@ -2280,6 +2309,7 @@ addr_check_auto_ack(uint8_t *frame, uint16_t frame_len)
idle();
#endif
prepare((const uint8_t *)ack, ACK_LEN);
idle_tx_rx((const uint8_t *)ack, ACK_LEN);
/* rx_rx() will follow */