cpu/stm32f1: fixed i2c driver

the _stop() function now blocks until the transfer is complete. Not waiting can lead to concurrent bus access and subsequent to bus errors.
RIOT-OS · Nov 18, 2015 · 3d35c33 · 3d35c33
1 parent 20364ff
commit 3d35c33
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/cpu/stm32f1/periph/i2c.c b/cpu/stm32f1/periph/i2c.c
@@ -451,6 +451,8 @@ static inline void _stop(I2C_TypeDef *dev)
     while (!(dev->SR1 & I2C_SR1_BTF));
     /* send STOP condition */
     dev->CR1 |= I2C_CR1_STOP;
+    /* wait until transmission is complete */
+    while (dev->SR2 & I2C_SR2_BUSY);
 }
 
 #if I2C_0_EN