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Add CFG_RTC_DS1337_NOOSC to turn off OSC output

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The default settings for RTC DS1337 keeps the OSC
output, 32,768 Hz, on. This add CFG_RTC_DS1337_NOOSC to
turn it off.

Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@transmode.se>
This commit is contained in:
Joakim Tjernlund 2008-03-26 13:02:13 +01:00 • committed by Wolfgang Denk
parent 438a4c1126
commit da8808df7a
2 changed files with 10 additions and 2 deletions
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1
README
View file

@ -689,6 +689,7 @@ The following options need to be configured:
CONFIG_RTC_DS164x - use Dallas DS164x RTC CONFIG_RTC_DS164x - use Dallas DS164x RTC
CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC CONFIG_RTC_ISL1208 - use Intersil ISL1208 RTC
CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC CONFIG_RTC_MAX6900 - use Maxim, Inc. MAX6900 RTC
CFG_RTC_DS1337_NOOSC - Turn off the OSC output for DS1337
Note that if the RTC uses I2C, then the I2C interface Note that if the RTC uses I2C, then the I2C interface
must also be configured. See I2C Support, below. must also be configured. See I2C Support, below.

11
drivers/rtc/ds1337.c
View file

@ -158,11 +158,18 @@ void rtc_set (struct rtc_time *tmp)
* SQW/INTB* pin and program it for 32,768 Hz output. Note that * SQW/INTB* pin and program it for 32,768 Hz output. Note that
* according to the datasheet, turning on the square wave output * according to the datasheet, turning on the square wave output
* increases the current drain on the backup battery from about * increases the current drain on the backup battery from about
* 600 nA to 2uA. * 600 nA to 2uA. Define CFG_RTC_DS1337_NOOSC if you wish to turn
* off the OSC output.
*/ */
#ifdef CFG_RTC_DS1337_NOOSC
#define RTC_DS1337_RESET_VAL \
(RTC_CTL_BIT_INTCN | RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2)
#else
#define RTC_DS1337_RESET_VAL (RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2)
#endif
void rtc_reset (void) void rtc_reset (void)
{ {
rtc_write (RTC_CTL_REG_ADDR, RTC_CTL_BIT_RS1 | RTC_CTL_BIT_RS2); rtc_write (RTC_CTL_REG_ADDR, RTC_DS1337_RESET_VAL);
} }