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arch/arm/src/max326xx: Fix some misthinking in the last commit.

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This commit is contained in:
Gregory Nutt 2018-11-21 15:23:05 -06:00
parent c7cb4fa594
commit 9ca2cde234
1 changed files with 24 additions and 14 deletions
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38
arch/arm/src/max326xx/max32660/max32660_rtc.c
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@ -620,9 +620,10 @@ int max326_rtc_setalarm(FAR struct timespec *ts, alm_callback_t cb, FAR void *ar
#ifdef CONFIG_RTC_ALARM
int max326_rtc_rdalarm(FAR b32_t *ftime)
{
uint64_t b32val;
uint64_t b32rssa;
b32_t b32sec;
b32_t b32rssa;
uint32_t sec;
uint32_t ssec;
uint32_t rssa;
uint32_t verify;
uint32_t regval;
@ -635,6 +636,7 @@ int max326_rtc_rdalarm(FAR b32_t *ftime)
{
rssa = getreg32(MAX326_RTC_RSSA);
sec = getreg32(MAX326_RTC_SEC);
ssec = getreg32(MAX326_RTC_SEC);
verify = getreg32(MAX326_RTC_RSSA);
}
while (verify != rssa);
@ -647,22 +649,30 @@ int max326_rtc_rdalarm(FAR b32_t *ftime)
return -EINVAL;
}
/* Convert the RSA value to b32_t time
/* Get the current time as a b32_t value */
b32sec = itob32(sec) | ssec << (32 - 8);
/* Use the RSSA value to determine the time when the alarm will fire:
*
* Form: SSssssssff00000
* alarm_time = current_time + rssa_remaining
*
* Where SS is the MS 8-bits of seconds from the SEC register
* ssssss is the LS 24 bits of seconds from the RRSA register.
* ff is the MS 8-bit of the fractional value.
*
* Where the sssssff value is (1 << 32) - RRSA, that is, the time
* remaining until the rollover.
* Where current_time is the time from SEC and SSEC registers.
* rssa_remaining is the time remaining until RSSA roles
* over to zero, that is (1 << 32) - RRSA.
*/
b32val = (uint64_t)(sec & 0xff000000) << 32;
b32rssa = 0x0000000100000000 - (uint64_t)rssa;
b32rssa = (b32rssa & 0x00000000ffffffff) << (32 - 8);
*ftime = (b32_t)(b32val | b32rssa);
if (rssa > 0)
{
b32rssa = 0x0000000100000000 - (uint64_t)rssa;
b32rssa = (b32rssa & 0x00000000ffffffff) << (32 - 8);
}
else
{
b32rssa = 0;
}
*ftime = b32sec + b32rssa;
return OK;
}
#endif