Add shared waveform processing, generation and firmware image support

c/set-protocol/include/set_signal.h

@@ -0,0 +1,24 @@
+/** @file set_signal.h Portable interpolation and DAC waveform preparation. */
+#ifndef SET_SIGNAL_H
+#define SET_SIGNAL_H
+#include "pcan_abi.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+enum { SET_SIGNAL_POLYNOMIAL, SET_SIGNAL_LINEAR, SET_SIGNAL_PCHIP, SET_SIGNAL_SPLINE };
+/* Caller-owned workspace: at least 14*count+128 doubles. No heap or globals.
+ * Inputs may be unsorted; duplicate times are averaged. No extrapolation.
+ * meta[0..2] = original count, unique count, RMSE at original measurements.
+ * endpoint=1 includes the last time; 0 samples a cyclic period [first,last).
+ * Return: 0 success, 1 bounds, 2 nonfinite/degenerate data, 3 rank deficient. */
+PCAN_ABI_API int set_signal_reconstruct(const double *x, const double *y, size_t count,
+    int method, unsigned degree, size_t output_count, int endpoint,
+    double *out_x, double *out_y, double *meta, double *work, size_t work_count);
+/* Reject out-of-range voltages, never silently clip. vref must be positive.
+ * All input is validated before any output is written. */
+PCAN_ABI_API int set_signal_dac12(const double *volts, size_t count, double vref,
+                                 uint16_t *codes);
+#ifdef __cplusplus
+}
+#endif
+#endif