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SAM3U-EK: Correct polarity of the PENIRQ signal

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This commit is contained in:
Gregory Nutt
2013-06-16 14:31:18 -06:00
parent c7fd7a4e27
commit c9f1d1857c
7 changed files with 42 additions and 56 deletions
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drivers/input/ads7843e.c
+5 -30
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@@ -104,9 +104,6 @@ static void ads7843e_lock(FAR struct spi_dev_s *spi);
static void ads7843e_unlock(FAR struct spi_dev_s *spi);
#endif
#if 0
static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv);
#endif
static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd);
/* Interrupts and data sampling */
@@ -266,22 +263,6 @@ static inline void ads7843e_configspi(FAR struct spi_dev_s *spi)
}
#endif
/****************************************************************************
* Name: ads7843e_waitbusy
****************************************************************************/
#if 0 /* Not used */
static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv)
{
/* BUSY is high impedance when the ads7843e not selected. When the
* ads7843e selected, BUSY is active high. Hence, it is necessary to have
* the ads7843e selected when this function is called.
*/
while (priv->config->busy(priv->config));
}
#endif
/****************************************************************************
* Name: ads7843e_sendcmd
*
@@ -312,8 +293,8 @@ static inline void ads7843e_waitbusy(FAR struct ads7843e_dev_s *priv)
* nominally 2 microseconds.
*
* So what good is this BUSY? Many boards do not even bother to bring it
* to the MCU. It looks like busy will stick high until we read the data
* so it does not really make any sense to wait on it.
* to the MCU. Busy will stick high until we read the data so you cannot
* wait on it before reading.
*
****************************************************************************/
@@ -330,15 +311,9 @@ static uint16_t ads7843e_sendcmd(FAR struct ads7843e_dev_s *priv, uint8_t cmd)
(void)SPI_SEND(priv->spi, cmd);
#if 1
/* Wait a tiny amount to make sure that the aquisition time is complete */
up_udelay(3); /* 3 microseconds */
#else
/* Wait until busy is no longer asserted */
ads7843e_waitbusy(priv);
#endif
/* Read the 12-bit data (LS 4 bits will be padded with zero) */
@@ -372,7 +347,7 @@ static void ads7843e_notify(FAR struct ads7843e_dev_s *priv)
* is no longer available.
*/
sem_post(&priv->waitsem);
sem_post(&priv->waitsem);
}
/* If there are threads waiting on poll() for ADS7843E data to become available,
@@ -484,7 +459,7 @@ static int ads7843e_waitsample(FAR struct ads7843e_dev_s *priv,
while (ads7843e_sample(priv, sample) < 0)
{
/* Wait for a change in the ADS7843E state */
ivdbg("Waiting..\n");
priv->nwaiters++;
ret = sem_wait(&priv->waitsem);
@@ -1283,7 +1258,7 @@ int ads7843e_register(FAR struct spi_dev_s *spi,
ads7843e_configspi(spi);
/* Enable the PEN IRQ */
ads7843e_sendcmd(priv, ADS7843_CMD_ENABPENIRQ);
/* Unlock the bus */