diff options
| -rw-r--r-- | util/uut/l_com_port.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/util/uut/l_com_port.c b/util/uut/l_com_port.c index a214d77302..70c60869b3 100644 --- a/util/uut/l_com_port.c +++ b/util/uut/l_com_port.c @@ -200,6 +200,57 @@ bool com_config_uart(int h_dev_drv, struct comport_fields com_port_fields) return true; } +/** + * Drain the console RX buffer before programming. The device should be in + * programming mode and shouldn't be printing anything. Anything that's + * currently in the buffer could interfere with programming. discard_input + * will discard everything currently in the buffer. It prints any non zero + * characters and returns when the console is empty and ready for programming. + * + * This is the same as discard_input in stm32mon. + * TODO: create common library for initializing serial consoles. + */ +static void discard_input(int fd) +{ + uint8_t buffer[64]; + int res, i; + int count_of_zeros; + + /* Keep track of discarded zeros */ + count_of_zeros = 0; + do { + res = read(fd, buffer, sizeof(buffer)); + if (res > 0) { + + /* Discard zeros in the beginning of the buffer. */ + for (i = 0; i < res; i++) + if (buffer[i]) + break; + + count_of_zeros += i; + if (i == res) { + /* Only zeros, nothing to print out. */ + continue; + } + + /* Discard zeros in the end of the buffer. */ + while (!buffer[res - 1]) { + count_of_zeros++; + res--; + } + + printf("Recv[%d]:", res - i); + for (; i < res; i++) + printf("%02x ", buffer[i]); + printf("\n"); + } + } while (res > 0); + + if (count_of_zeros) + printf("%d zeros ignored\n", count_of_zeros); +} + + /****************************************************************************** * Function: int com_port_open() * @@ -241,6 +292,12 @@ int com_port_open(const char *com_port_dev_name, return INVALID_HANDLE_VALUE; } + /* + * Drain the console, so what ever is already in the EC console wont + * interfere with programming. + */ + discard_input(port_handler); + return port_handler; } |