Work in progress on mimo Tx state machine.

git-svn-id: http://gnuradio.org/svn/gnuradio/trunk@10293 221aa14e-8319-0410-a670-987f0aec2ac5

1 files changed, 201 insertions, 0 deletions

diff --git a/usrp2/firmware/lib/bsm12.c b/usrp2/firmware/lib/bsm12.c
new file mode 100644
index 000000000..25c5a3fda
--- /dev/null
+++ b/usrp2/firmware/lib/bsm12.c
@@ -0,0 +1,201 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 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 "bsm12.h"
+#include "memory_map.h"
+#include "buffer_pool.h"
+#include "bool.h"
+#include "nonstdio.h"
+#include "buffer_state.h"
+#include <stdlib.h>
+
+static uint32_t last_send_ctrl[NBUFFERS];
+
+void
+bsm12_init(bsm12_t *sm, int buf0,
+	   const buf_cmd_args_t *recv,
+	   const buf_cmd_args_t *send0,
+	   const buf_cmd_args_t *send1,
+	   bsm12_inspector_t inspect)
+{
+  if (buf0 & 0x3)	// precondition: buf0 % 4 == 0
+    abort();
+
+  sm->buf0 = buf0;
+  sm->running = false;
+  sm->recv_args = *recv;
+  sm->send_args[0] = *send0;
+  sm->send_args[1] = *send1;
+
+  sm->rx_idle = true;
+  sm->tx_idle[0] = true;
+  sm->tx_idle[1] = true;
+
+  sm->inspect = inspect;
+
+  sm->bps_error = BPS_ERROR(buf0 + 0) | BPS_ERROR(buf0 + 1) | BPS_ERROR(buf0 + 2);
+  sm->bps_done  = BPS_DONE(buf0 + 0)  | BPS_DONE(buf0 + 1)  | BPS_DONE(buf0 + 2);
+  sm->bps_error_or_done = sm->bps_error | sm->bps_done;
+
+  // How much to adjust the last_line register.
+  // It's 1 for everything but the ethernet.
+  sm->last_line_adj = recv->port == PORT_ETH ? 3 : 1;
+
+  buffer_state[sm->buf0 + 0] = BS_EMPTY;
+  buffer_state[sm->buf0 + 1] = BS_EMPTY;
+  buffer_state[sm->buf0 + 2] = BS_EMPTY;
+
+  for (int i = 0; i < 3; i++){
+    sm->precomputed_receive_to_buf_ctrl_word[i] =
+      (BPC_READ
+       | BPC_BUFFER(sm->buf0 + i)
+       | BPC_PORT(sm->recv_args.port)
+       | BPC_STEP(1)
+       | BPC_FIRST_LINE(sm->recv_args.first_line)
+       | BPC_LAST_LINE(sm->recv_args.last_line));
+    
+    for (int j = 0; j < 2; j++){
+      sm->precomputed_send_from_buf_ctrl_word[i][j] =
+	(BPC_WRITE
+	 | BPC_BUFFER(sm->buf0 + i)
+	 | BPC_PORT(sm->send_args[j].port)
+	 | BPC_STEP(1)
+	 | BPC_FIRST_LINE(sm->send_args[j].first_line)
+	 | BPC_LAST_LINE(0));		// last line filled in at runtime
+    }
+  }
+}
+
+static inline void
+bsm12_receive_to_buf(bsm12_t *sm, int bufno)
+{
+  buffer_pool_ctrl->ctrl = sm->precomputed_receive_to_buf_ctrl_word[bufno & 0x3];
+}
+
+static inline void
+bsm12_send_from_buf(bsm12_t *sm, int bufno, int dst_idx)
+{
+  uint32_t t = (sm->precomputed_send_from_buf_ctrl_word[bufno & 0x3][dst_idx]
+		| BPC_LAST_LINE(buffer_pool_status->last_line[bufno] - sm->last_line_adj));
+
+  buffer_pool_ctrl->ctrl = t;
+  last_send_ctrl[bufno] = t;
+}
+
+static inline void
+bsm12_resend_from_buf(bsm12_t *sm, int bufno)
+{
+  buffer_pool_ctrl->ctrl = last_send_ctrl[bufno];
+}
+
+void
+bsm12_start(bsm12_t *sm)
+{
+  sm->running = true;
+
+  buffer_state[sm->buf0 + 0] = BS_EMPTY;
+  buffer_state[sm->buf0 + 1] = BS_EMPTY;
+  buffer_state[sm->buf0 + 2] = BS_EMPTY;
+
+  bp_clear_buf(sm->buf0 + 0);
+  bp_clear_buf(sm->buf0 + 1);
+  bp_clear_buf(sm->buf0 + 2);
+
+  sm->rx_idle = false;
+  sm->tx_idle[0] = true;
+  sm->tx_idle[1] = true;
+  bsm12_receive_to_buf(sm, sm->buf0);
+  buffer_state[sm->buf0] = BS_FILLING;
+}
+
+void
+bsm12_stop(bsm12_t *sm)
+{
+  sm->running = false;
+  bp_clear_buf(sm->buf0 + 0);
+  bp_clear_buf(sm->buf0 + 1);
+  bp_clear_buf(sm->buf0 + 2);
+  buffer_state[sm->buf0 + 0] = BS_EMPTY;
+  buffer_state[sm->buf0 + 1] = BS_EMPTY;
+  buffer_state[sm->buf0 + 2] = BS_EMPTY;
+}
+
+static void bsm12_process_helper(bsm12_t *sm, int buf_this);
+static void bsm12_error_helper(bsm12_t *sm, int buf_this);
+
+void
+bsm12_process_status(bsm12_t *sm, uint32_t status)
+{
+  // anything for us?
+  if ((status & sm->bps_error_or_done) == 0 || !sm->running)
+    return;
+
+  if (status & sm->bps_error){
+    // Most likely an ethernet Rx error.  We just restart the transfer.
+    if (status & (BPS_ERROR(sm->buf0 + 0)))
+      bsm12_error_helper(sm, sm->buf0 + 0);
+
+    if (status & (BPS_ERROR(sm->buf0 + 1)))
+      bsm12_error_helper(sm, sm->buf0 + 1);
+
+    if (status & (BPS_ERROR(sm->buf0 + 2)))
+      bsm12_error_helper(sm, sm->buf0 + 2);
+  }
+
+  if (status & BPS_DONE(sm->buf0 + 0))
+    bsm12_process_helper(sm, sm->buf0 + 0);
+
+  if (status & BPS_DONE(sm->buf0 + 1))
+    bsm12_process_helper(sm, sm->buf0 + 1);
+
+  if (status & BPS_DONE(sm->buf0 + 2))
+    bsm12_process_helper(sm, sm->buf0 + 2);
+}
+
+static void 
+bsm12_process_helper(bsm12_t *sm, int buf_this)
+{
+}
+
+static void
+bsm12_error_helper(bsm12_t *sm, int buf_this)
+{
+  bp_clear_buf(buf_this);		  // clears ERROR flag
+
+  if (buffer_state[buf_this] == BS_FILLING){
+    bsm12_receive_to_buf(sm, buf_this);	  // restart the xfer
+  }
+  else { // buffer was emptying
+    bsm12_resend_from_buf(sm, buf_this);  // restart the xfer
+  }
+}
+
+
+void
+bsm12_handle_tx_underrun(bsm12_t *sm)
+{
+}
+
+void
+bsm12_handle_rx_overrun(bsm12_t *sm)
+{
+}