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78 lines
1.7 KiB
C
78 lines
1.7 KiB
C
//---
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// gint:mod:rtc - Real-Time Clock
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//---
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#ifndef GINT_CORE_RTC
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#define GINT_CORE_RTC
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#include <gint/defs/attributes.h>
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//---
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// Hybrid SH7705-SH7305 Real-Time Clock. Refer to:
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// "Renesas SH7705 Group Hardware Manual"
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// Section 15: "Real-Time Clock (RTC)"
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// "Renesas SH7724 User's Manual: Hardware"
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// Section 28: "Real-Time Clock (RTC)"
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//---
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/* rtc_BCD2_t - a 2-digit BCD counter with a 1-byte gap */
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typedef struct
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{
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byte_union(,
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uint8_t TENS :4;
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uint8_t ONES :4;
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);
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pad(1);
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} GPACKED(2) rtc_BCD2_t;
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/* sh7705_rtc_t, sh7305_rtc_t - Date and time access, RTC control */
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typedef volatile struct
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{
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uint8_t const R64CNT; /* A 64-Hz counter */
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pad(1);
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rtc_BCD2_t RSECCNT; /* Second count */
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rtc_BCD2_t RMINCNT; /* Minute count */
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rtc_BCD2_t RHRCNT; /* Hour count */
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uint8_t RWKCNT; /* Day of week, must be in [0..6] */
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pad(1);
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rtc_BCD2_t RDAYCNT; /* Day count */
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rtc_BCD2_t RMONCNT; /* Month count */
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word_union(RYRCNT, /* Year count */
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uint THOUSANDS :4;
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uint HUNDREDS :4;
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uint TENS :4;
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uint ONES :4;
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);
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pad(12); /* Alarm registers... */
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byte_union(RCR1,
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uint8_t CF :1; /* Carry flag */
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uint8_t :2;
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uint8_t CIE :1; /* Carry interrupt enable */
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uint8_t AIE :1; /* Alarm interrupt enable */
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uint8_t :2;
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uint8_t AF :1; /* Alarm flag */
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);
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pad(1);
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byte_union(RCR2,
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uint8_t PEF :1; /* Periodic interrupt flag */
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uint8_t PES :3; /* Periodic interrupt interval */
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uint8_t :1;
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uint8_t ADJ :1; /* 30-second adjustment */
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uint8_t RESET :1; /* Reset trigger */
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uint8_t START :1; /* Start bit */
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);
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pad(1);
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} GPACKED(4) rtc_t;
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#define SH7705_RTC (*((rtc_t *)0xfffffec0))
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#define SH7305_RTC (*((rtc_t *)0xa413fec0))
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#endif /* GINT_CORE_RTC */
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