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| author | Randall Spangler <rspangler@chromium.org> | 2012-05-22 10:37:56 -0700 |
|---|---|---|
| committer | Randall Spangler <rspangler@chromium.org> | 2012-05-22 10:37:56 -0700 |
| commit | 9b44097d2399e8305f9b64f6e66c85acd18744f9 (patch) | |
| tree | c89d56cdfbe2a732b290434037d76b8492d900af /include/uart.h | |
| parent | 15854fa680c57cfd49f30cf265a2a4d4bb67b076 (diff) | |
| download | chrome-ec-9b44097d2399e8305f9b64f6e66c85acd18744f9.tar.gz | |
Add support for printing fixed-point numbers
This makes timestamps much easier to read.
Signed-off-by: Randall Spangler <rspangler@chromium.org>
BUG=chrome-os-partner:9866
TEST=timerinfo, taskinfo, battery commands have fixed-point numbers,
and timestamps printed in the log look right.
Change-Id: If91c83f725984c8e04bfb7cdcff316d9c3bfe24c
Diffstat (limited to 'include/uart.h')
| -rw-r--r-- | include/uart.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/include/uart.h b/include/uart.h index 17922879bc..f71d151c76 100644 --- a/include/uart.h +++ b/include/uart.h @@ -50,10 +50,14 @@ int uart_puts(const char *outstr); * int64_t / uint64_t (%ld / %lu / %lx) * pointer (%p) * And the following special format codes: - * current time in us (%T) + * current time in sec (%T) - interpreted as "%.6T" for fixed-point format * including padding (%-5s, %8d, %08x, %016lx) * - * Floating point output (%f / %g) is not supported. */ + * Floating point output (%f / %g) is not supported, but there is a fixed-point + * extension for integers; a padding option of .N (where N is a number) will + * put a decimal before that many digits. For example, printing 123 with + * format code %.6d will result in "0.000123". This is most useful for + * printing times, voltages, and currents. */ int uart_printf(const char *format, ...); /* Print formatted output to the UART, like vprintf(). Supports the same |