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Don't have to set SDA high initially in I2C reset because that is done by the pin configuration

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This commit is contained in:
Gregory Nutt 2014-07-09 17:17:32 -06:00
parent fc973eb512
commit 6563ae07c2
1 changed files with 5 additions and 5 deletions
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10
arch/arm/src/sama5/sam_twi.c
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@ -1574,7 +1574,11 @@ int up_i2creset(FAR struct i2c_dev_s *dev)
up_disable_irq(priv->attr->irq); up_disable_irq(priv->attr->irq);
/* Use PIO configuration to un-wedge the bus */ /* Use PIO configuration to un-wedge the bus.
*
* Reconfigure both pins as open drain outputs with initial output value
* "high" (i.e., floating since these are open-drain outputs).
*/
sclpin = MKI2C_OUTPUT(priv->attr->sclcfg); sclpin = MKI2C_OUTPUT(priv->attr->sclcfg);
sdapin = MKI2C_OUTPUT(priv->attr->sdacfg); sdapin = MKI2C_OUTPUT(priv->attr->sdacfg);
@ -1590,10 +1594,6 @@ int up_i2creset(FAR struct i2c_dev_s *dev)
sam_pio_forceclk(sclpin, true); sam_pio_forceclk(sclpin, true);
sam_pio_forceclk(sdapin, true); sam_pio_forceclk(sdapin, true);
/* Let SDA go high (i.e., floating since this is an open-drain output). */
sam_piowrite(sdapin, true);
/* Clock the bus until any slaves currently driving it low let it float. /* Clock the bus until any slaves currently driving it low let it float.
* Reading from the output will return the actual sensed level on the * Reading from the output will return the actual sensed level on the
* SDA pin (not the level that we wrote). * SDA pin (not the level that we wrote).