Explicitly add CREAD to c_cflag

CREAD flag is disabled after system boot for some tty devices. For instance, this is a case for /dev/ttyS? managed by 8250_omap linux kernel driver. The flag must be set if we want to read from the device. Reference: http://www.delorie.com/gnu/docs/glibc/libc_364.html """ Macro: tcflag_t CREAD If this bit is set, input can be read from the terminal. Otherwise, input is discarded when it arrives. """ Signed-off-by: Matwey V. Kornilov <matwey.kornilov@gmail.com>
tonyg · Jun 14, 2016 · a1b5ee9 · a1b5ee9
1 parent ffd2151
commit a1b5ee9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/c_src/serial.c b/c_src/serial.c
@@ -176,6 +176,7 @@ void set_raw_tty_mode(int fd)
 
   ttymodes.c_cflag |= CS8;         /* enable eight bit chars */
   ttymodes.c_cflag &= ~PARENB;     /* disable input parity check */
+  ttymodes.c_cflag |= CREAD;       /* enable receiver */
 
   ttymodes.c_oflag &= ~OPOST;      /* disable output processing */