Use “volatile” on struct members

Not all struct members are written in an ISR.

2 files changed, 7 insertions, 7 deletions

diff --git a/i2c.c b/i2c.c
index d7e5058..7fe4fd2 100644
--- a/i2c.c
+++ b/i2c.c
@@ -6,7 +6,7 @@
 #include "i2c.h"
 #include "common.h"
 
-volatile twReq twr;
+twReq twr;
 
 static void twStartRaw () {
 	/* disable stop, enable interrupt, reset twint, enable start, enable i2c */
diff --git a/i2c.h b/i2c.h
index ec7fd87..1090ee2 100644
--- a/i2c.h
+++ b/i2c.h
@@ -19,19 +19,19 @@ typedef struct {
 	twMode mode;
 	uint8_t address;
 	uint8_t subaddress;
-	uint8_t step;
+	volatile uint8_t step;
 	/* pointer to read/write data */
-	uint8_t *data;
+	volatile uint8_t *data;
 	/* number of bytes to be read/written */
 	uint8_t count;
 	/* current byte */
-	uint8_t i;
-	twStatus status;
+	volatile uint8_t i;
+	volatile twStatus status;
 	/* i2c bus status at the time if an error occured */
-	uint8_t error;
+	volatile uint8_t error;
 } twReq;
 
-extern volatile twReq twr;
+extern twReq twr;
 
 #include <stdbool.h>