--- /dev/null
+/*
+ * Copyright 2007,2008 Free Software Foundation, Inc.
+ *
+ * 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, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include "u2_init.h"
+#include "memory_map.h"
+#include "spi.h"
+#include "hal_io.h"
+#include "buffer_pool.h"
+#include "pic.h"
+#include "bool.h"
+#include "ethernet.h"
+#include "nonstdio.h"
+#include "usrp2_eth_packet.h"
+#include "dbsm.h"
+#include "app_common.h"
+#include "print_rmon_regs.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+
+
+/*
+ * Like tx_only.c, but we discard data packets instead of sending them to the
+ * DSP TX pipeline.
+ */
+
+int total_rx_pkts = 0;
+int total_rx_bytes = 0;
+
+
+static int timer_delta = MASTER_CLK_RATE/1000; // tick at 1kHz
+
+/*
+ * This program can respond to queries from the host
+ * and stream rx samples.
+ *
+ * Buffer 1 is used by the cpu to send frames to the host.
+ * Buffers 2 and 3 are used to double-buffer the DSP Rx to eth flow
+ * Buffers 4 and 5 are used to double-buffer the eth to DSP Tx eth flow
+ */
+//#define CPU_RX_BUF 0 // eth -> cpu
+//#define CPU_TX_BUF 1 // cpu -> eth
+
+#define DSP_RX_BUF_0 2 // dsp rx -> eth (double buffer)
+#define DSP_RX_BUF_1 3 // dsp rx -> eth
+#define DSP_TX_BUF_0 4 // eth -> dsp tx (double buffer)
+#define DSP_TX_BUF_1 5 // eth -> dsp tx
+
+
+/*
+ * ================================================================
+ * configure DSP RX double buffering state machine
+ * ================================================================
+ */
+
+// 4 lines of ethernet hdr + 1 line (word0)
+// DSP Rx writes timestamp followed by nlines_per_frame of samples
+#define DSP_RX_FIRST_LINE 5
+#define DSP_RX_SAMPLES_PER_FRAME 128
+#define DSP_RX_EXTRA_LINES 1 // writes timestamp
+
+// Receive from DSP Rx
+buf_cmd_args_t dsp_rx_recv_args = {
+ PORT_DSP,
+ DSP_RX_FIRST_LINE,
+ BP_LAST_LINE
+};
+
+// send to ethernet
+buf_cmd_args_t dsp_rx_send_args = {
+ PORT_ETH,
+ 0, // starts with ethernet header in line 0
+ 0, // filled in from last_line register
+};
+
+dbsm_t dsp_rx_sm; // the state machine
+
+/*
+ * ================================================================
+ * configure DSP TX double buffering state machine
+ * ================================================================
+ */
+
+// 4 lines of ethernet hdr + 2 lines (word0 + timestamp)
+// DSP Tx reads word0 (flags) + timestamp followed by samples
+
+#define DSP_TX_FIRST_LINE 4
+#define DSP_TX_SAMPLES_PER_FRAME 250 // not used except w/ debugging
+#define DSP_TX_EXTRA_LINES 2 // reads word0 + timestamp
+
+// Receive from ethernet
+buf_cmd_args_t dsp_tx_recv_args = {
+ PORT_ETH,
+ 0,
+ BP_LAST_LINE
+};
+
+// send to DSP Tx
+buf_cmd_args_t dsp_tx_send_args = {
+ PORT_DSP,
+ DSP_TX_FIRST_LINE, // starts just past ethernet header
+ 0 // filled in from last_line register
+};
+
+dbsm_t dsp_tx_sm; // the state machine
+
+
+// ----------------------------------------------------------------
+
+
+// The mac address of the host we're sending to.
+u2_mac_addr_t host_mac_addr;
+
+
+void
+timer_irq_handler(unsigned irq)
+{
+ hal_set_timeout(timer_delta); // schedule next timeout
+}
+
+// Tx DSP underrun
+void
+underrun_irq_handler(unsigned irq)
+{
+ putchar('U');
+
+ dbsm_stop(&dsp_tx_sm);
+ dsp_tx_regs->clear_state = 1;
+ dbsm_start(&dsp_tx_sm); // restart sm so we're listening to ethernet again
+
+ // putstr("\nirq: underrun\n");
+}
+
+
+void
+start_rx_cmd(const u2_mac_addr_t *host, op_start_rx_t *p)
+{
+}
+
+void
+stop_rx_cmd(void)
+{
+}
+
+static void
+setup_tx()
+{
+ dsp_tx_regs->clear_state = 1;
+ bp_clear_buf(DSP_TX_BUF_0);
+ bp_clear_buf(DSP_TX_BUF_1);
+
+#if 1
+ int tx_scale = 256;
+ int interp = 32;
+
+ op_config_tx_t def_config;
+ memset(&def_config, 0, sizeof(def_config));
+ def_config.phase_inc = 408021893; // 9.5 MHz [2**32 * fc/fsample]
+ def_config.scale_iq = (tx_scale << 16) | tx_scale;
+ def_config.interp = interp;
+
+ // setup Tx DSP regs
+ config_tx_cmd(&def_config);
+#endif
+}
+
+
+inline static void
+buffer_irq_handler(unsigned irq)
+{
+ uint32_t status = buffer_pool_status->status;
+
+ if (status & BPS_ERROR_ALL){
+ // FIXME rare path, handle error conditions
+ putstr("Errors! status = ");
+ puthex32_nl(status);
+
+ printf("total_rx_pkts = %d\n", total_rx_pkts);
+ printf("total_rx_bytes = %d\n", total_rx_bytes);
+
+ print_rmon_regs();
+
+ if (status & (BPS_ERROR(DSP_TX_BUF_0) | BPS_ERROR(DSP_TX_BUF_1))){
+ dbsm_stop(&dsp_tx_sm);
+ dsp_tx_regs->clear_state = 1; // try to restart
+ dbsm_start(&dsp_tx_sm);
+ return;
+ }
+ }
+
+ dbsm_process_status(&dsp_tx_sm, status);
+
+ if (status & BPS_DONE(CPU_TX_BUF)){
+ bp_clear_buf(CPU_TX_BUF);
+ }
+}
+
+/*
+ * Called when an ethernet packet is received.
+ * Return true if we handled it here (always!)
+ */
+bool
+nop_eth_pkt_inspector(dbsm_t *sm, int bufno)
+{
+ hal_toggle_leds(0x1);
+
+ u2_eth_packet_t *pkt = (u2_eth_packet_t *) buffer_ram(bufno);
+ size_t byte_len = (buffer_pool_status->last_line[bufno] - 1) * 4;
+
+ total_rx_pkts++;
+ total_rx_bytes += byte_len;
+
+ // inspect rcvd frame and figure out what do do.
+
+ if (pkt->ehdr.ethertype != U2_ETHERTYPE)
+ return true; // ignore, probably bogus PAUSE frame from MAC
+
+ int chan = u2p_chan(&pkt->fixed);
+
+ switch (chan){
+ case CONTROL_CHAN:
+ handle_control_chan_frame(pkt, byte_len);
+ return true; // we handled the packet
+ break;
+
+ case 0:
+ default:
+ return true; // say we handled it
+ break;
+ }
+}
+
+
+int
+main(void)
+{
+ u2_init();
+
+ // setup tx gpio bits for GPIOM_FPGA_1 -- fpga debug output
+ hal_gpio_set_tx_mode(15, 0, GPIOM_FPGA_1);
+ hal_gpio_set_rx_mode(15, 0, GPIOM_FPGA_1); // no printing...
+
+ putstr("\ntx_drop2\n");
+
+ // Control LEDs
+ hal_set_leds(0x0, 0x3);
+
+ // pic_register_handler(IRQ_OVERRUN, overrun_irq_handler);
+ pic_register_handler(IRQ_UNDERRUN, underrun_irq_handler);
+
+ //pic_register_handler(IRQ_TIMER, timer_irq_handler);
+ //hal_set_timeout(timer_delta);
+
+ ethernet_register_link_changed_callback(link_changed_callback);
+
+ ethernet_init();
+
+ // initialize double buffering state machine for ethernet -> DSP Tx
+
+ dbsm_init(&dsp_tx_sm, DSP_TX_BUF_0,
+ &dsp_tx_recv_args, &dsp_tx_send_args,
+ nop_eth_pkt_inspector);
+
+ // program tx registers
+ setup_tx();
+
+ // kick off the state machine
+ dbsm_start(&dsp_tx_sm);
+
+ while(1){
+ buffer_irq_handler(0);
+ }
+}
+
projects / debian / gnuradio / blobdiff