more sensible warnings if hardware is missing

1 files changed, 7 insertions, 2 deletions

diff --git a/i2c.c b/i2c.c
index 6571798..767e4f6 100644
--- a/i2c.c
+++ b/i2c.c
@@ -10,6 +10,9 @@
 
 #define I2C_BUS "/dev/i2c-3"
 
+gboolean write_error_flagged;
+gboolean read_error_flagged;
+
 
 void I2C_Write(gulong address, guchar value)
 {
@@ -23,7 +26,8 @@ void I2C_Write(gulong address, guchar value)
 
 	int device = open(I2C_BUS, O_RDWR);
 
-	if (device == -1) {
+	if ((device == -1) && !write_error_flagged) {
+		write_error_flagged = TRUE;
 		g_print_debug("ERROR: could not open I2C bus %s for writing\n", I2C_BUS);
 		return;
 	}
@@ -48,7 +52,8 @@ guchar I2C_Read(gulong address)
 
 	int device = open(I2C_BUS, O_RDWR);
 
-	if (device == -1) {
+	if ((device == -1) && !read_error_flagged) {
+                read_error_flagged = TRUE;
 		g_print_debug("ERROR: could not open I2C bus %s for reading\n", I2C_BUS);
 		return 0;
 	}