diff options
Diffstat (limited to 'devices/uart/uart_16550.h')
| -rw-r--r-- | devices/uart/uart_16550.h | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/devices/uart/uart_16550.h b/devices/uart/uart_16550.h index f8e1931..176dea2 100644 --- a/devices/uart/uart_16550.h +++ b/devices/uart/uart_16550.h @@ -8,42 +8,42 @@ int uart_puts(const FILE *self, const char *string, int length); void uart_flush(__attribute__((unused)) const FILE *self); enum uart_16550_offset { - Data = 0, // read from receive buffer / write to transmit buffer | BaudDiv_l - InterruptControl = 1, // interrupt enable | BaudDiv_h - FifoControl = 2, // interrupt ID and FIFO control - LineControl = 3, // most significant bit is the DLAB + Data = 0, /* read from receive buffer / write to transmit buffer | BaudDiv_l */ + InterruptControl = 1, /* interrupt enable | BaudDiv_h */ + FifoControl = 2, /* interrupt ID and FIFO control */ + LineControl = 3, /* most significant bit is the DLAB */ ModemControl = 4, LineStatus = 5, ModemStatus = 6, Scratch = 7, }; -// Line Control -// | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | -// |dla| | parity | s | data | +/* Line Control + * | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | + * |dla| | parity | s | data | */ enum LineControl { - d5bit = 0x00, // 0000 0000 data bits - d6bit = 0x01, // 0000 0001 - d7bit = 0x02, // 0000 0010 - d8bit = 0x03, // 0000 0011 - // none = 0b00000000, // parity bits - odd = 0x08, // 0000 1000 - even = 0x18, // 0001 1000 - mark = 0x28, // 0010 1000 - space = 0x38, // 0011 1000 - // s1bit = 0b00000000, // stop bits - s2bit = 0x04, // 0000 0100 1.5 for 5bit data; 2 otherwise - dlab = 0x80 // 1000 0000 divisor latch access bit + d5bit = 0x00, /* 0000 0000 data bits */ + d6bit = 0x01, /* 0000 0001 */ + d7bit = 0x02, /* 0000 0010 */ + d8bit = 0x03, /* 0000 0011 */ + /* none = 0b00000000, // parity bits */ + odd = 0x08, /* 0000 1000 */ + even = 0x18, /* 0001 1000 */ + mark = 0x28, /* 0010 1000 */ + space = 0x38, /* 0011 1000 */ + /* s1bit = 0b00000000, // stop bits */ + s2bit = 0x04, /* 0000 0100 1.5 for 5bit data; 2 otherwise */ + dlab = 0x80 /* 1000 0000 divisor latch access bit */ }; -// Line Status Register +/* Line Status Register */ enum LineStatus { - DR = (1 << 0), // data ready: see if there is data to read - OE = (1 << 1), // overrun error: see if there has been data lost - PE = (1 << 2), // parity error: see if there was error in transmission - FE = (1 << 3), // framing error: see if a stop bit was missing - BI = (1 << 4), // break indicator: see if there is a break in data input - THRE = (1 << 5), // transmitter holding register empty: see if transmission buffer is empty - TEMT = (1 << 6), // transmitter empty: see if transmitter is not doing anything - ERRO = (1 << 7), // impending error: see if there is an error with a word in the input buffer + DR = (1 << 0), /* data ready: see if there is data to read */ + OE = (1 << 1), /* overrun error: see if there has been data lost */ + PE = (1 << 2), /* parity error: see if there was error in transmission */ + FE = (1 << 3), /* framing error: see if a stop bit was missing */ + BI = (1 << 4), /* break indicator: see if there is a break in data input */ + THRE = (1 << 5), /* transmitter holding register empty: see if transmission buffer is empty */ + TEMT = (1 << 6), /* transmitter empty: see if transmitter is not doing anything */ + ERRO = (1 << 7), /* impending error: see if there is an error with a word in the input buffer */ }; |