Mirrors_Framework/PX4-Autopilot
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Avoid a possible issue where an interrupt can intervene at a critical point, possibly leading to excess bytes being transferred on the bus.

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px4dev
2012-09-14 00:22:07 -07:00
parent 04b5856764
commit adad44a3a9
1 changed files with 9 additions and 0 deletions
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nuttx/arch/arm/src/stm32/stm32_i2c.c
+9
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@@ -1198,6 +1198,10 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
{ {
stm32_i2c_traceevent(priv, I2CEVENT_RCVBYTE, priv->dcnt); stm32_i2c_traceevent(priv, I2CEVENT_RCVBYTE, priv->dcnt);
#ifdef CONFIG_I2C_POLLED
//irqstate_t state = irqsave();
#endif
/* Receive a byte */ /* Receive a byte */
*priv->ptr++ = stm32_i2c_getreg(priv, STM32_I2C_DR_OFFSET); *priv->ptr++ = stm32_i2c_getreg(priv, STM32_I2C_DR_OFFSET);
@@ -1209,6 +1213,11 @@ static int stm32_i2c_isr(struct stm32_i2c_priv_s *priv)
stm32_i2c_modifyreg(priv, STM32_I2C_CR1_OFFSET, I2C_CR1_ACK, 0); stm32_i2c_modifyreg(priv, STM32_I2C_CR1_OFFSET, I2C_CR1_ACK, 0);
} }
priv->dcnt--; priv->dcnt--;
#ifdef CONFIG_I2C_POLLED
//irqrestore(state);
#endif
} }
} }