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drivers: i2c_nrfx_twim: Fix handling of zero-length transfers

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For a zero-length transfer, the STOP task is not triggered
automatically by the shortcut with the event that signals
the transfer end because such event is not generated.
Trigger this task "manually" to prevent the driver getting
stuck after the address byte is acknowledged.

Signed-off-by: Andrzej Głąbek <andrzej.glabek@nordicsemi.no>
This commit is contained in:
Andrzej Głąbek 2021-04-19 15:29:21 +02:00 • committed by Carles Cufí
commit cb86a2b306
1 changed files with 11 additions and 0 deletions
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11
drivers/i2c/i2c_nrfx_twim.c
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@ -127,6 +127,17 @@ static int i2c_nrfx_twim_transfer(const struct device *dev,
}
}
if (cur_xfer.primary_length == 0) {
/* For a zero-length transfer, the STOP task will not
* be triggered automatically by the shortcut with the
* event that signals the transfer end. It needs to be
* done "manually" to prevent the driver getting stuck
* after the address byte is acknowledged.
*/
nrf_twim_task_trigger(get_dev_config(dev)->twim.p_twim,
NRF_TWIM_TASK_STOP);
}
ret = k_sem_take(&(get_dev_data(dev)->completion_sync),
I2C_TRANSFER_TIMEOUT_MSEC);
if (ret != 0) {