oehansens i2c and spi extensions

i2cspi_BaS_gcc/include/wait.h

@@ -0,0 +1,63 @@
+/*
+ * wait.h
+ *
+ *      Author: mfro
+ *
+ * This file is part of BaS_gcc.
+ *
+ * BaS_gcc 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * BaS_gcc 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 BaS_gcc.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * Copyright 2010 - 2012 F. Aschwanden
+ * Copyright 2011 - 2012 V. Riviere
+ * Copyright 2012        M. Froeschle
+ *
+ */
+
+#ifndef _WAIT_H_
+#define _WAIT_H_
+
+#include <bas_types.h>
+
+typedef bool (*checker_func)(void);
+
+extern __inline__ void wait(uint32_t) __attribute__((always_inline));
+extern __inline__ bool waitfor(uint32_t us, checker_func condition) __attribute__((always_inline));
+/*
+ * wait for the specified number of us on slice timer 0. Replaces the original routines that had
+ * the number of useconds to wait for hardcoded in their name.
+ */
+extern __inline__ void wait(uint32_t us)
+{
+	uint32_t target = MCF_SLT_SCNT(0) - (us * 132);
+
+	while (MCF_SLT_SCNT(0) > target);
+}
+
+/*
+ * the same as above, with a checker function which gets called while
+ * busy waiting and allows for an early return if it returns true
+ */
+extern __inline__ bool waitfor(uint32_t us, checker_func condition)
+{
+	uint32_t target = MCF_SLT_SCNT(0) - (us * 132);
+	uint32_t res;
+
+	do
+	{
+		if ((res = (*condition)()))
+			return res;
+	} while (MCF_SLT_SCNT(0) > target);
+	return false;
+}
+#endif /* _WAIT_H_ */