drivers: i2c_nrfx_twim: Fix handling of zero-length transfers (cb86a2b3) · Commits · Wenxi XU / zephyr

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>

drivers/i2c/i2c_nrfx_twim.c

+11 −0

Original line number	Diff line number	Diff line
		@@ -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) {

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