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-rw-r--r--firmware/microblaze/apps/txrx.c414
1 files changed, 414 insertions, 0 deletions
diff --git a/firmware/microblaze/apps/txrx.c b/firmware/microblaze/apps/txrx.c
new file mode 100644
index 000000000..d0108c1a5
--- /dev/null
+++ b/firmware/microblaze/apps/txrx.c
@@ -0,0 +1,414 @@
+//
+// Copyright 2010 Ettus Research LLC
+//
+/*
+ * 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 <stdbool.h>
+#include "ethernet.h"
+#include "nonstdio.h"
+#include "usrp2_eth_packet.h"
+#include "usrp2_ipv4_packet.h"
+#include "usrp2_udp_packet.h"
+#include "dbsm.h"
+#include "app_common_v2.h"
+#include "memcpy_wa.h"
+#include <stddef.h>
+#include <stdlib.h>
+#include <string.h>
+#include "clocks.h"
+#include <vrt/bits.h>
+
+#define FW_SETS_SEQNO 1 // define to 0 or 1 (FIXME must be 1 for now)
+
+#if (FW_SETS_SEQNO)
+static int fw_seqno; // used when f/w is filling in sequence numbers
+#endif
+
+
+/*
+ * Full duplex Tx and Rx between ethernet and DSP pipelines
+ *
+ * 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 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 TX double buffering state machine (eth -> dsp)
+ * ================================================================
+ */
+
+// DSP Tx reads ethernet header words
+#define DSP_TX_FIRST_LINE ((sizeof(u2_eth_ip_udp_t))/4)
+
+// 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 transport header
+ 0 // filled in from last_line register
+};
+
+dbsm_t dsp_tx_sm; // the state machine
+
+/*
+ * ================================================================
+ * configure DSP RX double buffering state machine (dsp -> eth)
+ * ================================================================
+ */
+
+// DSP Rx writes ethernet header words
+#define DSP_RX_FIRST_LINE 1 //1 = control stuff to udp sm
+
+// receive from DSP
+buf_cmd_args_t dsp_rx_recv_args = {
+ PORT_DSP,
+ DSP_RX_FIRST_LINE,
+ BP_LAST_LINE
+};
+
+// send to ETH
+buf_cmd_args_t dsp_rx_send_args = {
+ PORT_ETH,
+ 0, // starts with ethernet header in line 0
+ 0, // filled in from list_line register
+};
+
+dbsm_t dsp_rx_sm; // the state machine
+
+
+// The mac address of the host we're sending to.
+eth_mac_addr_t host_mac_addr;
+
+#define TIME_NOW ((uint32_t)(~0))
+
+// variables for streaming mode
+
+static bool streaming_p = false;
+static unsigned int streaming_items_per_frame = 0;
+static uint32_t time_secs = TIME_NOW;
+static uint32_t time_ticks = TIME_NOW;
+static int streaming_frame_count = 0;
+#define FRAMES_PER_CMD 2
+
+bool is_streaming(void){ return streaming_p; }
+
+
+// ----------------------------------------------------------------
+
+#define VRT_HEADER_WORDS 5
+#define VRT_TRAILER_WORDS 1
+
+void
+restart_streaming(void)
+{
+ // setup RX DSP regs
+ sr_rx_ctrl->nsamples_per_pkt = streaming_items_per_frame;
+ sr_rx_ctrl->nchannels = 1;
+ sr_rx_ctrl->clear_overrun = 1; // reset
+ sr_rx_ctrl->vrt_header = (0
+ | VRTH_PT_IF_DATA_WITH_SID
+ | VRTH_HAS_TRAILER
+ | VRTH_TSI_OTHER
+ | VRTH_TSF_SAMPLE_CNT
+ | (VRT_HEADER_WORDS+streaming_items_per_frame+VRT_TRAILER_WORDS));
+ sr_rx_ctrl->vrt_stream_id = 0;
+ sr_rx_ctrl->vrt_trailer = 0;
+
+ streaming_p = true;
+ streaming_frame_count = FRAMES_PER_CMD;
+
+ sr_rx_ctrl->cmd =
+ MK_RX_CMD(FRAMES_PER_CMD * streaming_items_per_frame,
+ (time_ticks==TIME_NOW)?1:0, 1); // conditionally set "now" bit, set "chain" bit
+
+ // kick off the state machine
+ dbsm_start(&dsp_rx_sm);
+
+ sr_rx_ctrl->time_secs = time_secs;
+ sr_rx_ctrl->time_ticks = time_ticks; // enqueue first of two commands
+
+ // make sure this one and the rest have the "now" and "chain" bits set.
+ sr_rx_ctrl->cmd =
+ MK_RX_CMD(FRAMES_PER_CMD * streaming_items_per_frame, 1, 1);
+
+ sr_rx_ctrl->time_secs = 0;
+ sr_rx_ctrl->time_ticks = 0; // enqueue second command
+}
+
+/*
+ * 1's complement sum for IP and UDP headers
+ *
+ * init chksum to zero to start.
+ */
+static unsigned int
+CHKSUM(unsigned int x, unsigned int *chksum)
+{
+ *chksum += x;
+ *chksum = (*chksum & 0xffff) + (*chksum>>16);
+ *chksum = (*chksum & 0xffff) + (*chksum>>16);
+ return x;
+}
+
+void
+start_rx_streaming_cmd(op_start_rx_streaming_t *p)
+{
+ /*
+ * Construct ethernet header and preload into two buffers
+ */
+ struct {
+ uint32_t ctrl_word;
+ } mem _AL4;
+
+ memset(&mem, 0, sizeof(mem));
+ p->items_per_frame = (1500 - sizeof(u2_eth_ip_udp_t))/sizeof(uint32_t) - (VRT_HEADER_WORDS + VRT_TRAILER_WORDS); //FIXME
+ mem.ctrl_word = (VRT_HEADER_WORDS+p->items_per_frame+VRT_TRAILER_WORDS)*sizeof(uint32_t) | 1 << 16;
+
+ memcpy_wa(buffer_ram(DSP_RX_BUF_0), &mem, sizeof(mem));
+ memcpy_wa(buffer_ram(DSP_RX_BUF_1), &mem, sizeof(mem));
+
+ //setup ethernet header machine
+ sr_udp_sm->eth_hdr.mac_dst_0_1 = (host_dst_mac_addr.addr[0] << 8) | host_dst_mac_addr.addr[1];
+ sr_udp_sm->eth_hdr.mac_dst_2_3 = (host_dst_mac_addr.addr[2] << 8) | host_dst_mac_addr.addr[3];
+ sr_udp_sm->eth_hdr.mac_dst_4_5 = (host_dst_mac_addr.addr[4] << 8) | host_dst_mac_addr.addr[5];
+ sr_udp_sm->eth_hdr.mac_src_0_1 = (host_src_mac_addr.addr[0] << 8) | host_src_mac_addr.addr[1];
+ sr_udp_sm->eth_hdr.mac_src_2_3 = (host_src_mac_addr.addr[2] << 8) | host_src_mac_addr.addr[3];
+ sr_udp_sm->eth_hdr.mac_src_4_5 = (host_src_mac_addr.addr[4] << 8) | host_src_mac_addr.addr[5];
+ sr_udp_sm->eth_hdr.ether_type = ETHERTYPE_IPV4;
+
+ //setup ip header machine
+ unsigned int chksum = 0;
+ sr_udp_sm->ip_hdr.ver_ihl_tos = CHKSUM(0x4500, &chksum); // IPV4, 5 words of header (20 bytes), TOS=0
+ sr_udp_sm->ip_hdr.total_length = UDP_SM_INS_IP_LEN; // Don't checksum this line in SW
+ sr_udp_sm->ip_hdr.identification = CHKSUM(0x0000, &chksum); // ID
+ sr_udp_sm->ip_hdr.flags_frag_off = CHKSUM(0x4000, &chksum); // don't fragment
+ sr_udp_sm->ip_hdr.ttl_proto = CHKSUM(0x2011, &chksum); // TTL=32, protocol = UDP (17 decimal)
+ //sr_udp_sm->ip_hdr.checksum .... filled in below
+ uint32_t src_ip_addr = host_src_ip_addr.s_addr;
+ uint32_t dst_ip_addr = host_dst_ip_addr.s_addr;
+ sr_udp_sm->ip_hdr.src_addr_high = CHKSUM(src_ip_addr >> 16, &chksum); // IP src high
+ sr_udp_sm->ip_hdr.src_addr_low = CHKSUM(src_ip_addr & 0xffff, &chksum); // IP src low
+ sr_udp_sm->ip_hdr.dst_addr_high = CHKSUM(dst_ip_addr >> 16, &chksum); // IP dst high
+ sr_udp_sm->ip_hdr.dst_addr_low = CHKSUM(dst_ip_addr & 0xffff, &chksum); // IP dst low
+ sr_udp_sm->ip_hdr.checksum = UDP_SM_INS_IP_HDR_CHKSUM | (chksum & 0xffff);
+
+ //setup the udp header machine
+ sr_udp_sm->udp_hdr.src_port = host_src_udp_port;
+ sr_udp_sm->udp_hdr.dst_port = host_dst_udp_port;
+ sr_udp_sm->udp_hdr.length = UDP_SM_INS_UDP_LEN;
+ sr_udp_sm->udp_hdr.checksum = UDP_SM_LAST_WORD; // zero UDP checksum
+
+ if (FW_SETS_SEQNO)
+ fw_seqno = 0;
+
+ streaming_items_per_frame = p->items_per_frame;
+ time_secs = p->time_secs;
+ time_ticks = p->time_ticks;
+ restart_streaming();
+}
+
+void
+stop_rx_cmd(void)
+{
+ if (is_streaming()){
+ streaming_p = false;
+
+ // no samples, "now", not chained
+ sr_rx_ctrl->cmd = MK_RX_CMD(0, 1, 0);
+
+ sr_rx_ctrl->time_secs = 0;
+ sr_rx_ctrl->time_ticks = 0; // enqueue command
+ }
+
+}
+
+
+static void
+setup_tx()
+{
+ sr_tx_ctrl->clear_state = 1;
+ bp_clear_buf(DSP_TX_BUF_0);
+ bp_clear_buf(DSP_TX_BUF_1);
+
+ int tx_scale = 256;
+ int interp = 32;
+
+ // setup some defaults
+
+ dsp_tx_regs->freq = 0;
+ dsp_tx_regs->scale_iq = (tx_scale << 16) | tx_scale;
+ dsp_tx_regs->interp_rate = interp;
+}
+
+
+#if (FW_SETS_SEQNO)
+/*
+ * Debugging ONLY. This will be handled by the tx_protocol_engine.
+ *
+ * This is called when the DSP Rx chain has filled in a packet.
+ * We set and increment the seqno, then return false, indicating
+ * that we didn't handle the packet. A bit of a kludge
+ * but it should work.
+ */
+bool
+fw_sets_seqno_inspector(dbsm_t *sm, int buf_this) // returns false
+{
+ // queue up another rx command when required
+ if (streaming_p && --streaming_frame_count == 0){
+ streaming_frame_count = FRAMES_PER_CMD;
+ sr_rx_ctrl->time_secs = 0;
+ sr_rx_ctrl->time_ticks = 0;
+ }
+
+ return false; // we didn't handle the packet
+}
+#endif
+
+
+inline static void
+buffer_irq_handler(unsigned irq)
+{
+ uint32_t status = buffer_pool_status->status;
+
+ dbsm_process_status(&dsp_tx_sm, status);
+ dbsm_process_status(&dsp_rx_sm, status);
+}
+
+int
+main(void)
+{
+ u2_init();
+
+ putstr("\nTxRx-NEWETH\n");
+ print_mac_addr(ethernet_mac_addr()->addr);
+ newline();
+
+ ethernet_register_link_changed_callback(link_changed_callback);
+ ethernet_init();
+
+#if 0
+ // make bit 15 of Tx gpio's be a s/w output
+ hal_gpio_set_sel(GPIO_TX_BANK, 15, 's');
+ hal_gpio_set_ddr(GPIO_TX_BANK, 0x8000, 0x8000);
+#endif
+
+ output_regs->debug_mux_ctrl = 1;
+#if 0
+ hal_gpio_set_sels(GPIO_TX_BANK, "1111111111111111");
+ hal_gpio_set_sels(GPIO_RX_BANK, "1111111111111111");
+ hal_gpio_set_ddr(GPIO_TX_BANK, 0xffff, 0xffff);
+ hal_gpio_set_ddr(GPIO_RX_BANK, 0xffff, 0xffff);
+#endif
+
+
+ // 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,
+ eth_pkt_inspector);
+
+
+ // initialize double buffering state machine for DSP RX -> Ethernet
+
+ if (FW_SETS_SEQNO){
+ dbsm_init(&dsp_rx_sm, DSP_RX_BUF_0,
+ &dsp_rx_recv_args, &dsp_rx_send_args,
+ fw_sets_seqno_inspector);
+ }
+ else {
+ dbsm_init(&dsp_rx_sm, DSP_RX_BUF_0,
+ &dsp_rx_recv_args, &dsp_rx_send_args,
+ dbsm_nop_inspector);
+ }
+
+ // tell app_common that this dbsm could be sending to the ethernet
+ ac_could_be_sending_to_eth = &dsp_rx_sm;
+
+
+ // program tx registers
+ setup_tx();
+
+ // kick off the state machine
+ dbsm_start(&dsp_tx_sm);
+
+ //int which = 0;
+
+ while(1){
+ // hal_gpio_write(GPIO_TX_BANK, which, 0x8000);
+ // which ^= 0x8000;
+
+ buffer_irq_handler(0);
+
+ int pending = pic_regs->pending; // poll for under or overrun
+
+ if (pending & PIC_UNDERRUN_INT){
+ dbsm_handle_tx_underrun(&dsp_tx_sm);
+ pic_regs->pending = PIC_UNDERRUN_INT; // clear interrupt
+ putchar('U');
+ }
+
+ if (pending & PIC_OVERRUN_INT){
+ dbsm_handle_rx_overrun(&dsp_rx_sm);
+ pic_regs->pending = PIC_OVERRUN_INT; // clear pending interrupt
+
+ // FIXME Figure out how to handle this robustly.
+ // Any buffers that are emptying should be allowed to drain...
+
+ if (streaming_p){
+ // restart_streaming();
+ // FIXME report error
+ }
+ else {
+ // FIXME report error
+ }
+ putchar('O');
+ }
+ }
+}
+
+//-------------------compile time checks--------------------------------
+#define COMPILE_TIME_ASSERT(pred) switch(0){case 0:case pred:;}
+
+void compile_time_checks(void){
+ COMPILE_TIME_ASSERT(sizeof(u2_eth_hdr_t) == 14);
+ COMPILE_TIME_ASSERT(sizeof(u2_ipv4_hdr_t) == 20);
+ COMPILE_TIME_ASSERT(sizeof(u2_udp_hdr_t) == 8);
+}
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