Per the datasheet, the DAY (wday) register is user defined. Implement this.
Signed-off-by: Antoine Mathys
---
hw/ds1338.c | 15 ---
1 file changed, 12 insertions(+), 3 deletions(-)
diff --git a/hw/ds1338.c b/hw/ds1338.c
index 319c341..c5cee99 100644
--- a/hw/ds1338.c
+++ b/hw/ds1338.c
@@ -26,6 +26,7 @@
typedef struct {
I2CSlave i2c;
int64_t offset;
+uint8_t wday_offset;
uint8_t nvram[NVRAM_SIZE];
int32_t ptr;
bool addr_byte;
@@ -33,12 +34,13 @@ typedef struct {
static const VMStateDescription vmstate_ds1338 = {
.name = "ds1338",
-.version_id = 1,
+.version_id = 2,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_I2C_SLAVE(i2c, DS1338State),
VMSTATE_INT64(offset, DS1338State),
+VMSTATE_UINT8_V(wday_offset, DS1338State, 2),
VMSTATE_UINT8_ARRAY(nvram, DS1338State, NVRAM_SIZE),
VMSTATE_INT32(ptr, DS1338State),
VMSTATE_BOOL(addr_byte, DS1338State),
@@ -68,7 +70,7 @@ static void capture_current_time(DS1338State *s)
} else {
s->nvram[2] = to_bcd(now.tm_hour);
}
-s->nvram[3] = to_bcd(now.tm_wday + 1);
+s->nvram[3] = (now.tm_wday + s->wday_offset) % 7 + 1;
s->nvram[4] = to_bcd(now.tm_mday);
s->nvram[5] = to_bcd(now.tm_mon + 1);
s->nvram[6] = to_bcd(now.tm_year - 100);
@@ -152,7 +154,13 @@ static int ds1338_send(I2CSlave *i2c, uint8_t data)
}
break;
case 3:
-now.tm_wday = from_bcd(data & 7) - 1;
+{
+/* The day field is supposed to contain a value in
+ the range 1-7. Otherwise behavior is undefined.
+ */
+int user_wday = (data & 7) - 1;
+s->wday_offset = (user_wday - now.tm_wday + 7) % 7;
+}
break;
case 4:
now.tm_mday = from_bcd(data & 0x3f);
@@ -194,6 +202,7 @@ static void ds1338_reset(DeviceState *dev)
/* The clock is running and synchronized with the host */
s->offset = 0;
+s->wday_offset = 0;
memset(s->nvram, 0, NVRAM_SIZE);
}
--
1.7.10.4
