diff options
Diffstat (limited to 'src/ao_packet.c')
| -rw-r--r-- | src/ao_packet.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/src/ao_packet.c b/src/ao_packet.c new file mode 100644 index 00000000..3ce7e9ab --- /dev/null +++ b/src/ao_packet.c @@ -0,0 +1,152 @@ +/* + * Copyright © 2009 Keith Packard <keithp@keithp.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. + */ + +#include "ao.h" + +__xdata struct ao_packet_recv ao_rx_packet; +__xdata struct ao_packet ao_tx_packet; +__pdata uint8_t ao_packet_rx_len, ao_packet_rx_used, ao_packet_tx_used; + +static __xdata char tx_data[AO_PACKET_MAX]; +static __xdata char rx_data[AO_PACKET_MAX]; +static __pdata uint8_t rx_seq; + +__xdata struct ao_task ao_packet_task; +__xdata uint8_t ao_packet_enable; +__xdata uint8_t ao_packet_master_sleeping; + +void +ao_packet_send(void) +{ + ao_led_on(AO_LED_RED); + ao_config_get(); + ao_mutex_get(&ao_radio_mutex); + if (ao_packet_tx_used && ao_tx_packet.len == 0) { + memcpy(&ao_tx_packet.d, tx_data, ao_packet_tx_used); + ao_tx_packet.len = ao_packet_tx_used; + ao_tx_packet.seq++; + ao_packet_tx_used = 0; + ao_wakeup(&tx_data); + } + ao_radio_idle(); + ao_radio_done = 0; + RF_CHANNR = ao_config.radio_channel; + ao_dma_set_transfer(ao_radio_dma, + &ao_tx_packet, + &RFDXADDR, + sizeof (struct ao_packet), + DMA_CFG0_WORDSIZE_8 | + DMA_CFG0_TMODE_SINGLE | + DMA_CFG0_TRIGGER_RADIO, + DMA_CFG1_SRCINC_1 | + DMA_CFG1_DESTINC_0 | + DMA_CFG1_PRIORITY_HIGH); + ao_dma_start(ao_radio_dma); + RFST = RFST_STX; + __critical while (!ao_radio_done) + ao_sleep(&ao_radio_done); + ao_mutex_put(&ao_radio_mutex); + ao_led_off(AO_LED_RED); +} + +uint8_t +ao_packet_recv(void) +{ + uint8_t dma_done; + + ao_led_on(AO_LED_GREEN); + ao_config_get(); + ao_mutex_get(&ao_radio_mutex); + ao_radio_idle(); + RF_CHANNR = ao_config.radio_channel; + ao_dma_set_transfer(ao_radio_dma, + &RFDXADDR, + &ao_rx_packet, + sizeof (struct ao_packet_recv), + DMA_CFG0_WORDSIZE_8 | + DMA_CFG0_TMODE_SINGLE | + DMA_CFG0_TRIGGER_RADIO, + DMA_CFG1_SRCINC_0 | + DMA_CFG1_DESTINC_1 | + DMA_CFG1_PRIORITY_HIGH); + ao_dma_start(ao_radio_dma); + RFST = RFST_SRX; + __critical while (!ao_radio_dma_done) + if (ao_sleep(&ao_radio_dma_done) != 0) + ao_radio_abort(); + dma_done = ao_radio_dma_done; + ao_mutex_put(&ao_radio_mutex); + ao_led_off(AO_LED_GREEN); + + if (dma_done & AO_DMA_DONE) { + if (!(ao_rx_packet.status & PKT_APPEND_STATUS_1_CRC_OK)) + return AO_DMA_ABORTED; + if (ao_rx_packet.packet.len == AO_PACKET_SYN) { + rx_seq = ao_rx_packet.packet.seq; + ao_tx_packet.seq = ao_rx_packet.packet.ack; + ao_tx_packet.ack = rx_seq; + } else if (ao_rx_packet.packet.len) { + if (ao_rx_packet.packet.seq == (uint8_t) (rx_seq + (uint8_t) 1) && ao_packet_rx_used == ao_packet_rx_len) { + memcpy(rx_data, ao_rx_packet.packet.d, ao_rx_packet.packet.len); + ao_packet_rx_used = 0; + ao_packet_rx_len = ao_rx_packet.packet.len; + rx_seq = ao_rx_packet.packet.seq; + ao_tx_packet.ack = rx_seq; + ao_wakeup(&ao_stdin_ready); + } + } + if (ao_rx_packet.packet.ack == ao_tx_packet.seq) { + ao_tx_packet.len = 0; + ao_wakeup(&ao_tx_packet); + } + } + return dma_done; +} + +void +ao_packet_flush(void) +{ + /* If there is data to send, and this is the master, + * then poke the master to send all queued data + */ + if (ao_packet_tx_used && ao_packet_master_sleeping) + ao_wake_task(&ao_packet_task); +} + +void +ao_packet_putchar(char c) __reentrant +{ + while (ao_packet_tx_used == AO_PACKET_MAX && ao_packet_enable) { + ao_packet_flush(); + ao_sleep(&tx_data); + } + + if (ao_packet_enable) + tx_data[ao_packet_tx_used++] = c; +} + +char +ao_packet_pollchar(void) __critical +{ + if (!ao_packet_enable) + return AO_READ_AGAIN; + + if (ao_packet_rx_used == ao_packet_rx_len) + return AO_READ_AGAIN; + + return rx_data[ao_packet_rx_used++]; +} |