From 7e71a9741a3c8990baa9909969a97739bcd75867 Mon Sep 17 00:00:00 2001
From: Christophe Favergeon <Christophe.Favergeon@arm.com>
Date: Thu, 18 Feb 2021 11:40:09 +0100
Subject: [PATCH] CMSIS-DSP:New feature for issue #1129 (PythonWrapper)

---
 PythonWrapper/cmsisdsp_pkg/src/cmsismodule.c | 20 ++++++++++++++++++++
 PythonWrapper/cmsisdsp_pkg/src/cmsismodule.h |  8 +++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.c b/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.c
index 7bd04d45..47a1c1b8 100644
--- a/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.c
+++ b/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.c
@@ -275,6 +275,26 @@ CREATEMATRIX(f64,float64_t);
 CREATEMATRIX(q31,q31_t);
 CREATEMATRIX(q15,q15_t);
 
+#define NUMPYVECTORFROMBUFFER(EXT,CTYPE,NUMPYTYPE_FROMC)                     \
+PyObject *NumpyVectorFrom##EXT##Buffer(CTYPE *ptr,int nb)                    \
+{                                                                            \
+    npy_intp dims[1];                                                        \
+    const int ND=1;                                                          \
+    dims[0]=nb;                                                              \
+                                                                             \
+    void *pDst=PyMem_Malloc(sizeof(CTYPE) *nb);                              \
+    memcpy((void*)pDst,(void*)ptr,sizeof(CTYPE)*nb);                         \
+                                                                             \
+    PyObject *OBJ=PyArray_SimpleNewFromData(ND, dims, NUMPYTYPE_FROMC, pDst);\
+    PyObject *pythonResult = Py_BuildValue("O",OBJ);                         \
+    Py_DECREF(OBJ);                                                          \
+    return(pythonResult);                                                    \
+}
+
+NUMPYVECTORFROMBUFFER(f32,float32_t,NPY_FLOAT);
+
+
+
 #define NUMPYARRAYFROMMATRIX(EXT,NUMPYTYPE_FROMC)                                  \
 PyObject *NumpyArrayFrom##EXT##Matrix(arm_matrix_instance_##EXT *mat)              \
 {                                                                                  \
diff --git a/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.h b/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.h
index 0d22a25a..d640a412 100644
--- a/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.h
+++ b/PythonWrapper/cmsisdsp_pkg/src/cmsismodule.h
@@ -3922,11 +3922,17 @@ if (PyArg_ParseTupleAndKeywords(args, kwds, "|i", kwlist,&self->instance->numSta
 
 GETFIELD(arm_biquad_cascade_df2T_instance_f32,numStages,"i");
 
+static PyObject *                                                             
+Method_arm_biquad_cascade_df2T_instance_f32_state(ml_arm_biquad_cascade_df2T_instance_f32Object *self, PyObject *ignored)
+{                
+    float32_t *state=self->instance->pState;
+    return(NumpyVectorFromf32Buffer(state,self->instance->numStages * 2));                                                  
+} 
 
 static PyMethodDef arm_biquad_cascade_df2T_instance_f32_methods[] = {
 
     {"numStages", (PyCFunction) Method_arm_biquad_cascade_df2T_instance_f32_numStages,METH_NOARGS,"numStages"},
-
+    {"state", (PyCFunction) Method_arm_biquad_cascade_df2T_instance_f32_state,METH_NOARGS,"state"},
     {NULL}  /* Sentinel */
 };