drivers/i2c/i2c_imx: Check for I2C bus busy before starting transaction (4eee8a67) · Commits · Wenxi XU / zephyr

In some cases the minimum time between Stop and Start was not being considered when starting a new transfer. This patches adds a checking on the I2C Bus Busy flag before starting a new transaction. Signed-off-by:

Diego Sueiro <diego.sueiro@gmail.com>

drivers/i2c/i2c_imx.c

+9 −0

Original line number	Diff line number	Diff line
		@@ -179,12 +179,21 @@ static int i2c_imx_transfer(struct device dev, struct i2c_msg msgs,
		struct i2c_imx_data *data = DEV_DATA(dev);
		struct i2c_master_transfer *transfer = &data->transfer;
		u8_t buf, buf_end;
		u16_t timeout = UINT16_MAX;
		int result = -EIO;

		if (!num_msgs) {
		return 0;
		}

		/* Wait until bus not busy */
		while ((I2C_I2SR_REG(base) & i2cStatusBusBusy) && (--timeout)) {
		}

		if (timeout == 0) {
		return result;
		}

		/* Make sure we're in a good state so slave recognises the Start */
		I2C_SetWorkMode(base, i2cModeSlave);
		transfer->currentMode = i2cModeSlave;

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