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drivers/ioexpander/iso1i813t.c: fix error startup condition #19571

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Merged
linguini1 merged 1 commit into from
Jul 28, 2026
+16 −0
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drivers/ioexpander/iso1i813t.c: fix error startup condition #19571

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16 changes: 16 additions & 0 deletions drivers/ioexpander/iso1i813t.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
Expand All @@ -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;
}

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