setup_mux_mapped: use HIGH/LOW instead

Avoids on some platforms where when setting a mux will set it low when
it wouldn't be safe to.

Signed-off-by: Thomas Ingleby <thomas.c.ingleby@intel.com>

diff --git a/src/mraa.c b/src/mraa.c
index 7397bab..e50ce95 100644 (file)
--- a/src/mraa.c
+++ b/src/mraa.c
@@ -154,13 +154,17 @@ mraa_setup_mux_mapped(mraa_pin_t meta)
         if (mux_i == NULL) {
             return MRAA_ERROR_INVALID_HANDLE;
         }
-        // this function will sometimes fail, however this is not critical as
-        // long as the write succeeds - Test case galileo gen2 pin2
-        mraa_gpio_dir(mux_i, MRAA_GPIO_OUT);
 
-        if (mraa_gpio_write(mux_i, meta.mux[mi].value) != MRAA_SUCCESS) {
-            mraa_gpio_close(mux_i);
-            return MRAA_ERROR_INVALID_RESOURCE;
+        if (meta.mux[mi].value) {
+            if (mraa_gpio_dir(mux_i, MRAA_GPIO_OUT_HIGH) != MRAA_SUCCESS) {
+                mraa_gpio_close(mux_i);
+                return MRAA_ERROR_INVALID_RESOURCE;
+            }
+        } else {
+            if (mraa_gpio_dir(mux_i, MRAA_GPIO_OUT_LOW) != MRAA_SUCCESS) {
+                mraa_gpio_close(mux_i);
+                return MRAA_ERROR_INVALID_RESOURCE;
+            }
         }
         mraa_gpio_close(mux_i);
     }