diff options
| author | Antoine Mathys <barsamin@gmail.com> | 2012-12-13 14:05:27 +0000 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2012-12-13 14:05:27 +0000 |
| commit | 59dda8e05b015471d456177141a7c2eeda3dab14 (patch) | |
| tree | 2f93ae5cc101a3fa596356abd9465a2754856423 /hw/ds1338.c | |
| parent | 95c9361598e66de42facdac64e614e3de85186f5 (diff) | |
hw/ds1338.c: Fix handling of HOURS register.
Per the datasheet, the mapping between 12 and 24 hours modes is:
0 <-> 12 PM
1-12 <-> 1-12 AM
13-23 <-> 1-11 PM
Signed-off-by: Antoine Mathys <barsamin@gmail.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'hw/ds1338.c')
| -rw-r--r-- | hw/ds1338.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/hw/ds1338.c b/hw/ds1338.c index 69018bc966..0f887200f3 100644 --- a/hw/ds1338.c +++ b/hw/ds1338.c @@ -55,10 +55,15 @@ static void capture_current_time(DS1338State *s) qemu_get_timedate(&now, s->offset); s->nvram[0] = to_bcd(now.tm_sec); s->nvram[1] = to_bcd(now.tm_min); - if (s->nvram[2] & 0x40) { - s->nvram[2] = (to_bcd((now.tm_hour % 12)) + 1) | 0x40; - if (now.tm_hour >= 12) { - s->nvram[2] |= 0x20; + if (s->nvram[2] & HOURS_12) { + int tmp = now.tm_hour; + if (tmp == 0) { + tmp = 24; + } + if (tmp <= 12) { + s->nvram[2] = HOURS_12 | to_bcd(tmp); + } else { + s->nvram[2] = HOURS_12 | HOURS_PM | to_bcd(tmp - 12); } } else { s->nvram[2] = to_bcd(now.tm_hour); @@ -132,16 +137,18 @@ static int ds1338_send(I2CSlave *i2c, uint8_t data) now.tm_min = from_bcd(data & 0x7f); break; case 2: - if (data & 0x40) { - if (data & 0x20) { - data = from_bcd(data & 0x4f) + 11; - } else { - data = from_bcd(data & 0x1f) - 1; + if (data & HOURS_12) { + int tmp = from_bcd(data & (HOURS_PM - 1)); + if (data & HOURS_PM) { + tmp += 12; + } + if (tmp == 24) { + tmp = 0; } + now.tm_hour = tmp; } else { - data = from_bcd(data); + now.tm_hour = from_bcd(data & (HOURS_12 - 1)); } - now.tm_hour = data; break; case 3: now.tm_wday = from_bcd(data & 7) - 1; |