initial encoder class support

src/lcec_class_enc.h

@@ -0,0 +1,58 @@
+//
+//    Copyright (C) 2018 Sascha Ittner <sascha.ittner@modusoft.de>
+//
+//    This program is free software; you can redistribute it and/or modify
+//    it under the terms of the GNU General Public License as published by
+//    the Free Software Foundation; either version 2 of the License, or
+//    (at your option) any later version.
+//
+//    This program is distributed in the hope that it will be useful,
+//    but WITHOUT ANY WARRANTY; without even the implied warranty of
+//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//    GNU General Public License for more details.
+//
+//    You should have received a copy of the GNU General Public License
+//    along with this program; if not, write to the Free Software
+//    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
+//
+#ifndef _LCEC_CLASS_ENC_H_
+#define _LCEC_CLASS_ENC_H_
+
+#include "lcec.h"
+
+typedef struct {
+  hal_s32_t raw_home;
+  hal_u32_t raw_bits;
+  hal_float_t pprev_scale;
+
+  hal_s32_t *raw;
+  hal_u32_t *ext_lo;
+  hal_u32_t *ext_hi;
+  hal_u32_t *ref_lo;
+  hal_u32_t *ref_hi;
+
+  hal_bit_t *index_ena;
+  hal_bit_t *pos_reset;
+
+  hal_float_t *pos_enc;
+  hal_float_t *pos_abs;
+  hal_float_t *pos;
+
+  hal_bit_t *on_home_neg;
+  hal_bit_t *on_home_pos;
+
+  bool do_init;
+
+  int raw_shift;
+  uint32_t raw_mask;
+
+  uint32_t pprev_last;
+
+  int index_sign;
+
+} lcec_class_enc_data_t;
+
+int class_enc_init(struct lcec_slave *slave, lcec_class_enc_data_t *hal_data, int raw_bits, const char *pfx);
+void class_enc_update(lcec_class_enc_data_t *hal_data, uint32_t pprev, double scale, uint32_t raw, uint32_t ext_latch_raw, bool ext_latch_ena);
+
+#endif