1 files changed, 54 insertions, 0 deletions
diff --git a/gpio.c b/gpio.c
new file mode 100644
index 0000000..700dced
--- /dev/null
+++ b/gpio.c
@@ -0,0 +1,54 @@
+/************************************************************************/
+/*                                                                      */
+/*  File:           gpio.c                                              */
+/*  Description:    general purpose input/output driver.                */
+/*  Version:        1.0                                                 */
+/*  Author:         Otto Mattik                                         */
+/*                                                                      */
+/*  (C)Copyright Otto Mattik 2014-2021.                                 */
+/*                                                                      */
+/*  This file is a part of 'armen' (a tiny operating system).           */
+/*  'armen' is distributed under the CeCILL-V2.1 licence. For more      */
+/*  details about this licence, please visit the website cecill.info    */
+/*                                                                      */
+/************************************************************************/
+
+#include <stdarg.h>
+#include "armen.h"
+
+#ifdef __AVR_ARCH__
+  #define AVR_GPIO_C
+  #include "avr/gpio.c"
+#endif
+
+/*
+ * initialize a gpio pin
+ *
+ * input:
+ *  gpio        gpio pin
+ *  mode        input or output
+*/
+void gpio_pin_mode( uint8_t gpio, uint8_t mode, ... )
+{
+#ifdef CHECK_PARAM
+    if( gpio < (GPIO_MAX_PORT << 3) )
+#endif
+    {
+        if( mode == GPIO_INPUT )
+            gpio_pin_mode_input( gpio );
+        else
+#ifdef CHECK_PARAM
+        if( mode == GPIO_OUTPUT )
+#endif
+        {
+            va_list args;
+            uint8_t value;
+
+            va_start( args, mode );
+            value = (uint8_t)va_arg( args, int );
+            gpio_pin_mode_output( gpio, value );
+            va_end( args );
+        }
+    }
+}
+