diff options
Diffstat (limited to 'include/uart.h')
| -rw-r--r-- | include/uart.h | 26 |
1 files changed, 9 insertions, 17 deletions
diff --git a/include/uart.h b/include/uart.h index d4685cb2e7..05d4aee036 100644 --- a/include/uart.h +++ b/include/uart.h @@ -32,6 +32,14 @@ int uart_init_done(void); */ /** + * Put a single character to the UART, like putchar(). + * + * @param c Character to put + * @return EC_SUCCESS, or non-zero if output was truncated. + */ +int uart_putc(int c); + +/** * Put a null-terminated string to the UART, like fputs(). * * @return EC_SUCCESS, or non-zero if output was truncated. @@ -77,16 +85,6 @@ void uart_flush_output(void); void uart_flush_input(void); /** - * Non-destructively check for a character in the input buffer. - * - * @param c Character to search for - * - * @return the offset into the input buffer of the first match, or -1 if no - * match found in the input buffer. - */ -int uart_peek(int c); - -/** * Read a single character of input, similar to fgetc(). * * @return the character, or -1 if no input waiting. @@ -99,13 +97,7 @@ int uart_getc(void); * Reads input until one of the following conditions is met: * (1) <size-1> characters have been read. * (2) A newline ('\n') has been read. - * (3) The input buffer is empty. - * - * Condition (3) means this call never blocks. This is important - * because it prevents a race condition where the caller calls - * uart_peek() to see if input is waiting, or is notified by the - * callack that input is waiting, but then the input buffer overflows - * or someone else grabs the input before uart_gets() is called. + * (3) The input buffer is empty (this keeps the call from blocking). * * Characters are stored in <dest> and are null-terminated. * Characters include the newline if present, so that the caller can |