diff options
Diffstat (limited to 'components/drivers')
| -rw-r--r-- | components/drivers/serial/serial.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/components/drivers/serial/serial.c b/components/drivers/serial/serial.c index 5e7a8ec814..c4a7ac6980 100644 --- a/components/drivers/serial/serial.c +++ b/components/drivers/serial/serial.c @@ -257,8 +257,8 @@ static rt_size_t rt_serial_read(struct rt_device *dev, } read_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer; - /* set error code */ - if (read_nbytes == 0) + /* set error code if and only if in thread context */ + if (read_nbytes == 0 && !rt_interrupt_get_nest()) { rt_set_errno(-RT_EEMPTY); } @@ -349,7 +349,8 @@ static rt_size_t rt_serial_write(struct rt_device *dev, } write_nbytes = (rt_uint32_t)ptr - (rt_uint32_t)buffer; - if (write_nbytes == 0) + /* set error code if and only if in thread context */ + if (write_nbytes == 0 && !rt_interrupt_get_nest()) { rt_set_errno(-RT_EFULL); } |