4 files changed, 47 insertions, 14 deletions
diff --git a/bindings/Makefile b/bindings/Makefile
index c76d3a0..c1f19f0 100644
--- a/bindings/Makefile
+++ b/bindings/Makefile
@@ -11,7 +11,7 @@ clean:
 
 .PHONY: all check clean
 
-${SHARED_LIB}: ../verilator_lib/mul.v ../verilator_lib/sim.cc
+${SHARED_LIB}: ../cocotb_try/cic3_pdm.v ./sim_cic3_pdm.cc
 	verilator --cc --lib-create sim --build -j 0 -Wall $^
 
 check: ${PY_MODULE}
@@ -20,4 +20,3 @@ check: ${PY_MODULE}
 ${PY_MODULE}: ${SHARED_LIB}
 	python setup.py build_ext --inplace
 
-    
diff --git a/bindings/galearn_pdm.cpp b/bindings/galearn_pdm.cpp
index 5b7e4f5..541ba1a 100644
--- a/bindings/galearn_pdm.cpp
+++ b/bindings/galearn_pdm.cpp
@@ -1,11 +1,12 @@
 #include <pybind11/pybind11.h>
 #include <pybind11/numpy.h>
 
-int sim(void);
+int pdm2pcm_cic3(const uint8_t *pdm, int pdm_length, int16_t *pcm, int pcm_length);
+
 
 namespace py = pybind11;
 
-void process(py::array_t<uint8_t> arr1, py::array_t<int16_t> arr2) {
+int process(py::array_t<uint8_t> arr1, py::array_t<int16_t> arr2) {
     // Check shapes or sizes if needed
     auto buf1 = arr1.request();
     auto buf2 = arr2.request();
@@ -18,19 +19,12 @@ void process(py::array_t<uint8_t> arr1, py::array_t<int16_t> arr2) {
         throw std::runtime_error("Input 1 must be same or larger than input 2");
     }
 
-#if 0
-    // Example: access data
     uint8_t* in = static_cast<uint8_t*>(buf1.ptr);
     int16_t* out = static_cast<int16_t*>(buf2.ptr);
-    for (int i=0; i<buf2.size; i++) {
-        out[i] = in[i] + 1;
-    }
-#else
-
-    sim();
 
-#endif
+    int samples = pdm2pcm_cic3(in, arr1.size(), out, arr2.size());
 
+    return samples;
 }
 
 PYBIND11_MODULE(galearn_pdm, m) {
diff --git a/bindings/setup.py b/bindings/setup.py
index c2f93f7..0b18130 100644
--- a/bindings/setup.py
+++ b/bindings/setup.py
@@ -3,7 +3,7 @@ import pybind11
 import numpy
 import os.path
 
-verilated_build_dir = '../verilator_lib/obj_dir/'
+verilated_build_dir = './obj_dir/'
 
 ext_modules = [
     Extension(
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;
+}