bindings: Actually build cic3_pdm code

1 files changed, 40 insertions, 0 deletions

diff --git a/bindings/sim_cic3_pdm.cc b/bindings/sim_cic3_pdm.cc
new file mode 100644
index 0000000..e21010b
--- /dev/null
+++ b/bindings/sim_cic3_pdm.cc
@@ -0,0 +1,40 @@
+
+#include <cstdint>
+#include <cstdio>
+
+#include "Vcic3_pdm.h"
+#include "verilated.h"
+
+
+int
+pdm2pcm_cic3(const uint8_t *pdm, int pdm_length, int16_t *pcm, int pcm_length)
+{
+
+    // FIXME: verify that output buffer is large enough
+
+	VerilatedContext *cp = new VerilatedContext;
+
+	Vcic3_pdm *top = new Vcic3_pdm{cp};
+
+    // Start clock off
+	top->clk = 0;
+
+    // Go through all the input data
+    int pcm_sample = 0;
+
+	for (int i = 0; i < pdm_length; i++) {
+
+		top->pdm_in = bool(pdm[i]);
+		top->clk = 1;
+		top->eval();
+
+        if (top->pcm_valid) {
+		    pcm[pcm_sample++] = top->pcm_out;
+        }
+
+		top->clk = 0;
+		top->eval();
+	}
+
+	return pcm_sample;
+}