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drivers/stmpe811: ensure fifo is not empty before reading touch position

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This commit is contained in:
Alexandre Abadie 2020-07-21 17:00:39 +02:00
parent caead7bb75
commit 37b096562a
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GPG Key ID: 1C919A403CAE1405
1 changed files with 7 additions and 1 deletions
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8
drivers/stmpe811/stmpe811.c
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@ -194,6 +194,13 @@ int stmpe811_read_touch_position(stmpe811_t *dev, stmpe811_touch_position_t *pos
/* Acquire I2C device */
i2c_acquire(STMPE811_DEV_I2C);
/* Ensure there's a least one position measured in the FIFO */
uint8_t fifo_size = 0;
do {
i2c_read_reg(STMPE811_DEV_I2C, STMPE811_DEV_ADDR,
STMPE811_FIFO_SIZE, &fifo_size, 0);
} while (!fifo_size);
uint8_t xyz[4];
uint32_t xyz_ul;
@ -203,7 +210,6 @@ int stmpe811_read_touch_position(stmpe811_t *dev, stmpe811_touch_position_t *pos
i2c_release(STMPE811_DEV_I2C);
return -STMPE811_ERR_I2C;
}
_reset_fifo(dev);
/* Release I2C device */
i2c_release(STMPE811_DEV_I2C);