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drivers/ioexpander/iso1i813t.c: fix error startup condition

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The reference manual (section 3.2.1) states the user has to
read GLERR and INTERR registers to clear their bits and release
ERR pin after the startup sequence. Error bits are set to 1 after
the startup if external power supply is used.

Not clearing the bits leads to subsequent read call errors if VBB
errors are checked.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc 2026-07-28 15:49:37 +02:00 • committed by Matteo Golin
parent aeaa13227e
commit 69249fc9e6
1 changed files with 16 additions and 0 deletions
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16
drivers/ioexpander/iso1i813t.c
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@ -511,6 +511,7 @@ FAR struct ioexpander_dev_s *iso1i813t_initialize(FAR struct spi_dev_s *spi,
FAR struct iso1i813t_config_s *config)
{
FAR struct iso1i813t_dev_s *priv;
uint8_t txdata;
#ifdef CONFIG_ISO1I813T_MULTIPLE
/* Allocate the device state structure */
@ -535,6 +536,21 @@ FAR struct ioexpander_dev_s *iso1i813t_initialize(FAR struct spi_dev_s *spi,
nxmutex_init(&priv->lock);
/* Read GLERR and INTERR registers to clear their status bits
* and release ERR pin after the startup sequence. This is a required
* step if external power supply is used.
*/
txdata = ISO1I813T_GLERR;
iso1i813t_select(priv->spi, priv->config, 8);
SPI_EXCHANGE(priv->spi, &txdata, NULL, 1);
iso1i813t_deselect(priv->spi, priv->config);
txdata = ISO1I813T_INTERR;
iso1i813t_select(priv->spi, priv->config, 8);
SPI_EXCHANGE(priv->spi, &txdata, NULL, 1);
iso1i813t_deselect(priv->spi, priv->config);
return &priv->dev;
}