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Add logic to detect rollowing while reading or setting the time

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This commit is contained in:
Gregory Nutt 2015-11-17 14:39:47 -06:00
parent 45530a77d4
commit 249fa2475b
1 changed files with 72 additions and 28 deletions
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92
drivers/timers/ds3231.c
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@ -264,70 +264,93 @@ int ds3231_rtc_initialize(FAR struct i2c_dev_s *i2c)
int up_rtc_getdatetime(FAR struct tm *tp)
{
struct i2c_msg_s msg[2];
uint8_t buffer[8];
struct i2c_msg_s msg[4];
uint8_t secaddr;
uint8_t buffer[7];
uint8_t seconds;
int tmp;
int ret;
/* Select to begin reading at the seconds register */
buffer[0] = DS3231_TIME_SECR;
secaddr = DS3231_TIME_SECR;
msg[0].addr = DS3231_I2C_ADDRESS;
msg[0].flags = 0;
msg[0].buffer = buffer;
msg[0].buffer = &secaddr;
msg[0].length = 1;
/* Set up to read 7 registers: secs, min, hr, dow, date, mth, yr */
/* Set up to read 7 registers: secondss, minutes, hour, day-of-week, date,
* month, year
*/
msg[1].addr = DS3231_I2C_ADDRESS;
msg[1].flags = I2C_M_READ;
msg[1].buffer = &buffer[1];
msg[1].buffer = buffer;
msg[1].length = 7;
/* Read the seconds register again */
msg[2].addr = DS3231_I2C_ADDRESS;
msg[2].flags = 0;
msg[2].buffer = &secaddr;
msg[2].length = 1;
msg[3].addr = DS3231_I2C_ADDRESS;
msg[3].flags = I2C_M_READ;
msg[3].buffer = &seconds;
msg[3].length = 1;
/* Configure I2C before using it */
I2C_SETFREQUENCY(g_ds3231.i2c, CONFIG_DS3231_I2C_FREQUENCY);
/* Perform the transfer (This could be done with I2C_WRITEREAD()) */
/* Perform the transfer (This could be done with I2C_WRITEREAD()). The
* transfer may be performed repeatedly of the seconds values decreases,
* meaning that that was a rollover in the seconds.
*/
ret = I2C_TRANSFER(g_ds3231.i2c, msg, 1);
do
{
ret = I2C_TRANSFER(g_ds3231.i2c, msg, 4);
if (ret < 0)
{
rtcdbg("ERROR: I2C_TRANSFER failed: %d\n", ret)
return ret;
}
}
while (buffer[0] > seconds);
/* Format the return time */
/* Return seconds (0-61) */
tp->tm_sec = rtc_bcd2bin(buffer[1] & DS3231_TIME_SEC_BCDMASK);
tp->tm_sec = rtc_bcd2bin(buffer[0] & DS3231_TIME_SEC_BCDMASK);
/* Return minutes (0-59) */
tp->tm_min = rtc_bcd2bin(buffer[2] & DS3231_TIME_MIN_BCDMASK);
tp->tm_min = rtc_bcd2bin(buffer[1] & DS3231_TIME_MIN_BCDMASK);
/* Return hour (0-23). This assumes 24-hour time was set. */
tp->tm_hour = rtc_bcd2bin(buffer[3] & DS3231_TIME_HOUR24_BCDMASK);
tp->tm_hour = rtc_bcd2bin(buffer[2] & DS3231_TIME_HOUR24_BCDMASK);
#if defined(CONFIG_LIBC_LOCALTIME) || defined(CONFIG_TIME_EXTENDED)
/* Return the day of the week (0-6) */
tp->tm_wday = (rtc_bcd2bin(buffer[4]) & DS3231_TIME_DAY_MASK)- 1;
tp->tm_wday = (rtc_bcd2bin(buffer[3]) & DS3231_TIME_DAY_MASK)- 1;
#endif
/* Return the day of the month (1-31) */
tp->tm_mday = rtc_bcd2bin(buffer[5] & DS3231_TIME_DATE_BCDMASK);
tp->tm_mday = rtc_bcd2bin(buffer[4] & DS3231_TIME_DATE_BCDMASK);
/* Return the month (0-11) */
tp->tm_mon = rtc_bcd2bin(buffer[6] & DS3231_TIME_MONTH_BCDMASK) - 1;
tp->tm_mon = rtc_bcd2bin(buffer[5] & DS3231_TIME_MONTH_BCDMASK) - 1;
/* Return the years since 1990 */
tmp = rtc_bcd2bin(buffer[7] & DS3231_TIME_YEAR_BCDMASK);
tmp = rtc_bcd2bin(buffer[5] & DS3231_TIME_YEAR_BCDMASK);
if ((buffer[6] & DS3231_TIME_CENTURY_MASK) == DS3231_TIME_1900)
{
@ -359,10 +382,11 @@ int up_rtc_getdatetime(FAR struct tm *tp)
int up_rtc_settime(FAR const struct timespec *tp)
{
struct i2c_msg_s msg;
struct i2c_msg_s msg[3];
struct tm newtm;
time_t newtime;
uint8_t buffer[8];
uint8_t seconds;
uint8_t century;
uint8_t year;
int ret;
@ -451,24 +475,44 @@ int up_rtc_settime(FAR const struct timespec *tp)
/* Setup the I2C message */
msg.addr = DS3231_I2C_ADDRESS;
msg.flags = 0;
msg.buffer = buffer;
msg.length = 8;
msg[0].addr = DS3231_I2C_ADDRESS;
msg[0].flags = 0;
msg[0].buffer = buffer;
msg[0].length = 8;
/* Read back the seconds register */
msg[1].addr = DS3231_I2C_ADDRESS;
msg[1].flags = 0;
msg[1].buffer = buffer;
msg[1].length = 1;
msg[2].addr = DS3231_I2C_ADDRESS;
msg[2].flags = I2C_M_READ;
msg[2].buffer = &seconds;
msg[2].length = 1;
/* Configure I2C before using it */
I2C_SETFREQUENCY(g_ds3231.i2c, CONFIG_DS3231_I2C_FREQUENCY);
/* Perform the transfer (This could be done with I2C_READ) */
/* Perform the transfer (This could be done with I2C_READ). This transfer
* will be repeated if the seconds count rolls over to a smaller value
* while writing.
*/
ret = I2C_TRANSFER(g_ds3231.i2c, &msg, 1);
do
{
ret = I2C_TRANSFER(g_ds3231.i2c, msg, 3);
if (ret < 0)
{
rtcdbg("ERROR: I2C_TRANSFER failed: %d\n", ret)
}
return ret;
}
}
while (buffer[1] > seconds);
return OK;
}
#endif /* CONFIG_RTC_DS3231 */