ecp5: Adding carry helper functions

Signed-off-by: David Shah <davey1576@gmail.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/common/design_utils.cc b/common/design_utils.cc
index 21c9dcc4..0976d6dd 100644
--- a/common/design_utils.cc
+++ b/common/design_utils.cc
@@ -73,4 +73,23 @@ void print_utilisation(const Context *ctx)
     log_break();
 }
 
+// Connect a net to a port
+void connect_port(const Context *ctx, NetInfo *net, CellInfo *cell, IdString port_name) {
+    PortInfo &port = cell->ports.at(port_name);
+    NPNR_ASSERT(port.net == nullptr);
+    port.net = net;
+    if (port.type == PORT_OUT) {
+        NPNR_ASSERT(net->driver.cell == nullptr);
+        net->driver.cell = cell;
+        net->driver.port = port_name;
+    } else if (port.type == PORT_IN) {
+        PortRef user;
+        user.cell = cell;
+        user.port = port_name;
+        net->users.push_back(user);
+    } else {
+        NPNR_ASSERT_FALSE("invalid port type for connect_port");
+    }
+}
+
 NEXTPNR_NAMESPACE_END