525209ac9
Denys Vlasenko
2016-09-26
Subject
libbb/speed_table.c: expand comments
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libbb/speed_table.c+16 -1
| @@ -103,8 +103,23 @@ static const struct speed_map speeds[] = { | |
| {B4000000, 4000000/200 + 0x8000u}, | |
| #endif | |
| /* 4000000/200 = 0x4e20, bit#15 still does not interfere with the value */ | |
| + | /* (can use /800 if higher speeds would appear, /1600 won't work for B500000) */ |
| }; | |
| + | /* |
| + | * TODO: maybe we can just bite the bullet, ditch the table and use termios2 |
| + | * Linux API (supports arbitrary baud rates, no Bxxxx mess needed)? Example: |
| + | * |
| + | * #include <asm/termios.h> |
| + | * #include <asm/ioctls.h> |
| + | * struct termios2 t; |
| + | * ioctl(fd, TCGETS2, &t); |
| + | * t.c_ospeed = t.c_ispeed = 543210; |
| + | * t.c_cflag &= ~CBAUD; |
| + | * t.c_cflag |= BOTHER; |
| + | * ioctl(fd, TCSETS2, &t); |
| + | */ |
| + | |
| enum { NUM_SPEEDS = ARRAY_SIZE(speeds) }; | |
| unsigned FAST_FUNC tty_baud_to_value(speed_t speed) | |
| @@ -114,7 +129,7 @@ unsigned FAST_FUNC tty_baud_to_value(speed_t speed) | |
| do { | |
| if (speed == speeds[i].speed) { | |
| if (speeds[i].value & 0x8000u) { | |
| - | return ((unsigned long) (speeds[i].value) & 0x7fffU) * 200; |
| + | return ((unsigned)(speeds[i].value) & 0x7fffU) * 200; |
| } | |
| return speeds[i].value; | |
| } | |