Fix ZMQ TX channel mapping for NULL pointers

Fix ZMQ transmit frequency mapping

Use map mask in ZMQ to determine mapped channels

Fix ZMQ mapping

lib/src/phy/rf/rf_zmq_imp.c

@@ -617,23 +617,28 @@ int rf_zmq_recv_with_time_multi(void* h, void** data, uint32_t nsamples, bool bl
 
     // Map ports to data buffers according to the selected frequencies
     pthread_mutex_lock(&handler->rx_config_mutex);
+    bool  mapped[SRSRAN_MAX_CHANNELS]  = {}; // Mapped mask, set to true when the physical channel is used
     cf_t* buffers[SRSRAN_MAX_CHANNELS] = {}; // Buffer pointers, NULL if unmatched
-    for (uint32_t i = 0; i < handler->nof_channels; i++) {
-      bool mapped = false;
 
-      // Find first matching frequency
-      for (uint32_t j = 0; j < handler->nof_channels && !mapped; j++) {
-        // Traverse all channels, break if mapped
-        if (buffers[j] == NULL && rf_zmq_rx_match_freq(&handler->receiver[j], handler->rx_freq_mhz[i])) {
-          // Available buffer and matched frequency with receiver
-          buffers[j] = (cf_t*)data[i];
-          mapped     = true;
+    // For each logical channel...
+    for (uint32_t logical = 0; logical < handler->nof_channels; logical++) {
+      bool unmatched = true;
+
+      // For each physical channel...
+      for (uint32_t physical = 0; physical < handler->nof_channels; physical++) {
+        // Consider a match if the physical channel is NOT mapped and the frequency match
+        if (!mapped[physical] && rf_zmq_rx_match_freq(&handler->receiver[physical], handler->rx_freq_mhz[logical])) {
+          // Not mapped and matched frequency with receiver
+          buffers[physical] = (cf_t*)data[logical];
+          mapped[physical]  = true;
+          unmatched         = false;
+          break;
         }
       }
 
       // If no matching frequency found; set data to zeros
-      if (!mapped && data[i]) {
-        memset(data[i], 0, sizeof(cf_t) * nsamples);
+      if (unmatched) {
+        srsran_vec_zero(data[logical], nsamples);
       }
     }
     pthread_mutex_unlock(&handler->rx_config_mutex);
@@ -831,17 +836,19 @@ int rf_zmq_send_timed_multi(void*  h,
 
     // Map ports to data buffers according to the selected frequencies
     pthread_mutex_lock(&handler->tx_config_mutex);
-    cf_t* buffers[SRSRAN_MAX_CHANNELS] = {}; // Buffer pointers, NULL if unmatched
-    for (uint32_t i = 0; i < handler->nof_channels; i++) {
-      bool mapped = false;
-
-      // Find first matching frequency
-      for (uint32_t j = 0; j < handler->nof_channels && !mapped; j++) {
-        // Traverse all channels, break if mapped
-        if (buffers[j] == NULL && rf_zmq_tx_match_freq(&handler->transmitter[j], handler->tx_freq_mhz[i])) {
-          // Available buffer and matched frequency with receiver
-          buffers[j] = (cf_t*)data[i];
-          mapped     = true;
+    bool  mapped[SRSRAN_MAX_CHANNELS]  = {}; // Mapped mask, set to true when the physical channel is used
+    cf_t* buffers[SRSRAN_MAX_CHANNELS] = {}; // Buffer pointers, NULL if unmatched or zero transmission
+
+    // For each logical channel...
+    for (uint32_t logical = 0; logical < handler->nof_channels; logical++) {
+      // For each physical channel...
+      for (uint32_t physical = 0; physical < handler->nof_channels; physical++) {
+        // Consider a match if the physical channel is NOT mapped and the frequency match
+        if (!mapped[physical] && rf_zmq_tx_match_freq(&handler->transmitter[physical], handler->tx_freq_mhz[logical])) {
+          // Not mapped and matched frequency with receiver
+          buffers[physical] = (cf_t*)data[logical];
+          mapped[physical]  = true;
+          break;
         }
       }
     }