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-rw-r--r--src/librtc.c174
1 files changed, 88 insertions, 86 deletions
diff --git a/src/librtc.c b/src/librtc.c
index a64c5af89..b87862a8f 100644
--- a/src/librtc.c
+++ b/src/librtc.c
@@ -1,29 +1,22 @@
-#include "global.h"
-
-struct RtcInfo
-{
- u8 year;
- u8 month;
- u8 dayOfMonth;
- u8 dayOfWeek;
- u8 hour;
- u8 minute;
- u8 second;
- u8 control;
- u8 unknown1;
- u8 unknown2;
-};
-
-#define OFFSET_YEAR offsetof(struct RtcInfo, year)
-#define OFFSET_MONTH offsetof(struct RtcInfo, month)
-#define OFFSET_DAY_OF_MONTH offsetof(struct RtcInfo, dayOfMonth)
-#define OFFSET_DAY_OF_WEEK offsetof(struct RtcInfo, dayOfWeek)
-#define OFFSET_HOUR offsetof(struct RtcInfo, hour)
-#define OFFSET_MINUTE offsetof(struct RtcInfo, minute)
-#define OFFSET_SECOND offsetof(struct RtcInfo, second)
-#define OFFSET_CONTROL offsetof(struct RtcInfo, control)
-#define OFFSET_UNKNOWN1 offsetof(struct RtcInfo, unknown1)
-#define OFFSET_UNKNOWN2 offsetof(struct RtcInfo, unknown2)
+#include "gba/gba.h"
+#include "rtc.h"
+
+#define RTC_CTRL_UNK1 0x02 // unknown
+#define RTC_CTRL_IRQ_ENABLE 0x08 // per-minute IRQ enable
+#define RTC_CTRL_UNK2 0x20 // unknown
+#define RTC_CTRL_24HOUR 0x40 // 0: 12-hour mode, 1: 24-hour mode
+#define RTC_CTRL_POWER_FAILURE 0x80 // power failure occurred
+
+#define OFFSET_YEAR offsetof(struct RtcInfo, year)
+#define OFFSET_MONTH offsetof(struct RtcInfo, month)
+#define OFFSET_DAY offsetof(struct RtcInfo, day)
+#define OFFSET_DAY_OF_WEEK offsetof(struct RtcInfo, dayOfWeek)
+#define OFFSET_HOUR offsetof(struct RtcInfo, hour)
+#define OFFSET_MINUTE offsetof(struct RtcInfo, minute)
+#define OFFSET_SECOND offsetof(struct RtcInfo, second)
+#define OFFSET_CONTROL offsetof(struct RtcInfo, control)
+#define OFFSET_UNKNOWN1 offsetof(struct RtcInfo, unknown1)
+#define OFFSET_UNKNOWN2 offsetof(struct RtcInfo, unknown2)
#define RTC_BUF(info, index) (*((u8 *)(info) + (index)))
@@ -33,57 +26,56 @@ struct RtcInfo
#define RTC_TIME_BUF(info, index) (*((u8 *)(info) + OFFSET_HOUR + (index)))
#define RTC_TIME_BUF_LEN (OFFSET_SECOND - OFFSET_HOUR + 1)
+#define RTC_CMD_RESET 0x60
+#define RTC_CMD_WR_CONTROL 0x62
+#define RTC_CMD_RD_CONTROL 0x63
+#define RTC_CMD_WR_DATETIME 0x64
+#define RTC_CMD_RD_DATETIME 0x65
+#define RTC_CMD_WR_TIME 0x66
+#define RTC_CMD_RD_TIME 0x67
+#define RTC_CMD_WR_UNKNOWN 0x68
+
extern vu16 GPIOPortData;
extern vu16 GPIOPortDirection;
-extern vu16 GPIOPortReadWrite;
+extern vu16 GPIOPortReadEnable;
extern bool8 gRtcLocked;
-void RTC_SetReadWrite();
-void RTC_SetReadOnly();
-u8 RTC_Init();
-bool8 RTC_Reset();
-bool8 RTC_GetControlReg(struct RtcInfo *rtc);
-bool8 RTC_SetControlReg(struct RtcInfo *rtc);
-bool8 RTC_GetDateTime(struct RtcInfo *rtc);
-bool8 RTC_SetDateTime(struct RtcInfo *rtc);
-bool8 RTC_GetTime(struct RtcInfo *rtc);
-bool8 RTC_SetTime(struct RtcInfo *rtc);
-bool8 RTC_SetUnknownData(struct RtcInfo *rtc);
-s32 RTC_WriteByte(u8 value);
-s32 RTC_WriteByteReversed(u8 value);
-u8 RTC_ReadByte();
-void RTC_SetReadWriteInternal();
-void RTC_SetReadOnlyInternal();
-
-void RTC_SetReadWrite()
+s32 RTC_WriteCommand(u8 value);
+s32 RTC_WriteData(u8 value);
+u8 RTC_ReadData();
+void RTC_EnableGpioPortRead();
+void RTC_DisableGpioPortRead();
+
+void RTC_Unprotect()
{
- RTC_SetReadWriteInternal();
+ RTC_EnableGpioPortRead();
gRtcLocked = FALSE;
}
-void RTC_SetReadOnly()
+void RTC_Protect()
{
- RTC_SetReadOnlyInternal();
+ RTC_DisableGpioPortRead();
gRtcLocked = TRUE;
}
-u8 RTC_Init()
+u8 RTC_Probe()
{
- u8 v2;
+ u8 errorCode;
struct RtcInfo rtc;
- if (!RTC_GetControlReg(&rtc))
+ if (!RTC_GetControl(&rtc))
return 0;
- v2 = 0;
+ errorCode = 0;
- if ((rtc.control & 0xC0) == 0x80 || !(rtc.control & 0xC0))
+ if ((rtc.control & (RTC_INFO_CTRL_POWER_FAILURE | RTC_INFO_CTRL_24HOUR)) == RTC_INFO_CTRL_POWER_FAILURE
+ || (rtc.control & (RTC_INFO_CTRL_POWER_FAILURE | RTC_INFO_CTRL_24HOUR)) == 0)
{
if (!RTC_Reset())
return 0;
- v2++;
+ errorCode++;
}
RTC_GetTime(&rtc);
@@ -91,12 +83,12 @@ u8 RTC_Init()
if (rtc.second & 0x80)
{
if (!RTC_Reset())
- return (v2 << 4) & 0xF0;
+ return (errorCode << 4) & 0xF0;
- v2++;
+ errorCode++;
}
- return (v2 << 4) | 1;
+ return (errorCode << 4) | 1;
}
bool8 RTC_Reset()
@@ -114,21 +106,21 @@ bool8 RTC_Reset()
GPIOPortDirection = 7;
- RTC_WriteByte(0x60);
+ RTC_WriteCommand(RTC_CMD_RESET);
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
- rtc.control = 0x40;
+ rtc.control = RTC_INFO_CTRL_24HOUR;
- result = RTC_SetControlReg(&rtc);
+ result = RTC_SetControl(&rtc);
return result;
}
-bool8 RTC_GetControlReg(struct RtcInfo *rtc)
+bool8 RTC_GetControl(struct RtcInfo *rtc)
{
u8 controlData;
@@ -142,13 +134,16 @@ bool8 RTC_GetControlReg(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x63);
+ RTC_WriteCommand(RTC_CMD_RD_CONTROL);
GPIOPortDirection = 5;
- controlData = RTC_ReadByte();
+ controlData = RTC_ReadData();
- rtc->control = (controlData & 0xC0) | ((controlData & 0x20) >> 3) | ((controlData & 8) >> 2) | ((controlData & 2) >> 1);
+ rtc->control = (controlData & (RTC_CTRL_POWER_FAILURE | RTC_CTRL_24HOUR))
+ | ((controlData & RTC_CTRL_UNK2) >> 3)
+ | ((controlData & RTC_CTRL_IRQ_ENABLE) >> 2)
+ | ((controlData & RTC_CTRL_UNK1) >> 1);
GPIOPortData = 1;
GPIOPortData = 1;
@@ -158,7 +153,7 @@ bool8 RTC_GetControlReg(struct RtcInfo *rtc)
return TRUE;
}
-bool8 RTC_SetControlReg(struct RtcInfo *rtc)
+bool8 RTC_SetControl(struct RtcInfo *rtc)
{
u8 controlData;
@@ -170,13 +165,16 @@ bool8 RTC_SetControlReg(struct RtcInfo *rtc)
GPIOPortData = 1;
GPIOPortData = 5;
- controlData = ((rtc->control & 4) << 3) | (1 << 6) | ((rtc->control & 2) << 2) | ((rtc->control & 1) << 1);
+ controlData = RTC_CTRL_24HOUR
+ | ((rtc->control & RTC_INFO_CTRL_UNK2) << 3)
+ | ((rtc->control & RTC_INFO_CTRL_IRQ_ENABLE) << 2)
+ | ((rtc->control & RTC_INFO_CTRL_UNK1) << 1);
GPIOPortDirection = 7;
- RTC_WriteByte(0x62);
+ RTC_WriteCommand(RTC_CMD_WR_CONTROL);
- RTC_WriteByteReversed(controlData);
+ RTC_WriteData(controlData);
GPIOPortData = 1;
GPIOPortData = 1;
@@ -200,12 +198,12 @@ bool8 RTC_GetDateTime(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x65);
+ RTC_WriteCommand(RTC_CMD_RD_DATETIME);
GPIOPortDirection = 5;
for (i = 0; i < RTC_DATETIME_BUF_LEN; i++)
- RTC_DATETIME_BUF(rtc, i) = RTC_ReadByte();
+ RTC_DATETIME_BUF(rtc, i) = RTC_ReadData();
RTC_BUF(rtc, OFFSET_HOUR) &= 0x7F;
@@ -231,10 +229,10 @@ bool8 RTC_SetDateTime(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x64);
+ RTC_WriteCommand(RTC_CMD_WR_DATETIME);
for (i = 0; i < RTC_DATETIME_BUF_LEN; i++)
- RTC_WriteByteReversed(RTC_DATETIME_BUF(rtc, i));
+ RTC_WriteData(RTC_DATETIME_BUF(rtc, i));
GPIOPortData = 1;
GPIOPortData = 1;
@@ -258,12 +256,12 @@ bool8 RTC_GetTime(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x67);
+ RTC_WriteCommand(RTC_CMD_RD_TIME);
GPIOPortDirection = 5;
for (i = 0; i < RTC_TIME_BUF_LEN; i++)
- RTC_TIME_BUF(rtc, i) = RTC_ReadByte();
+ RTC_TIME_BUF(rtc, i) = RTC_ReadData();
RTC_BUF(rtc, OFFSET_HOUR) &= 0x7F;
@@ -289,10 +287,10 @@ bool8 RTC_SetTime(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x66);
+ RTC_WriteCommand(RTC_CMD_WR_TIME);
for (i = 0; i < RTC_TIME_BUF_LEN; i++)
- RTC_WriteByteReversed(RTC_TIME_BUF(rtc, i));
+ RTC_WriteData(RTC_TIME_BUF(rtc, i));
GPIOPortData = 1;
GPIOPortData = 1;
@@ -312,9 +310,13 @@ bool8 RTC_SetUnknownData(struct RtcInfo *rtc)
gRtcLocked = TRUE;
+ // unknown1 appears to be a BCD number in the range 0-11,
+ // so it may be an hour in 12-hour format.
+ // Months are normally 1-12.
+
a[0] = ((rtc->unknown1 & 0xF) + 10 * ((rtc->unknown1 >> 4) & 0xF));
- if (a[0] <= 0xB)
+ if (a[0] < 12)
a[0] = rtc->unknown1;
else
a[0] = rtc->unknown1 | 0x80;
@@ -326,10 +328,10 @@ bool8 RTC_SetUnknownData(struct RtcInfo *rtc)
GPIOPortDirection = 7;
- RTC_WriteByte(0x68);
+ RTC_WriteCommand(RTC_CMD_WR_UNKNOWN);
for (i = 0; i < 2; i++)
- RTC_WriteByteReversed(a[i]);
+ RTC_WriteData(a[i]);
GPIOPortData = 1;
GPIOPortData = 1;
@@ -339,7 +341,7 @@ bool8 RTC_SetUnknownData(struct RtcInfo *rtc)
return TRUE;
}
-s32 RTC_WriteByte(u8 value)
+s32 RTC_WriteCommand(u8 value)
{
u8 i;
u8 temp;
@@ -356,7 +358,7 @@ s32 RTC_WriteByte(u8 value)
// control reaches end of non-void function
}
-s32 RTC_WriteByteReversed(u8 value)
+s32 RTC_WriteData(u8 value)
{
u8 i;
u8 temp;
@@ -373,7 +375,7 @@ s32 RTC_WriteByteReversed(u8 value)
// control reaches end of non-void function
}
-u8 RTC_ReadByte()
+u8 RTC_ReadData()
{
u8 i;
u8 temp;
@@ -395,12 +397,12 @@ u8 RTC_ReadByte()
return value;
}
-void RTC_SetReadWriteInternal()
+void RTC_EnableGpioPortRead()
{
- GPIOPortReadWrite = 1;
+ GPIOPortReadEnable = 1;
}
-void RTC_SetReadOnlyInternal()
+void RTC_DisableGpioPortRead()
{
- GPIOPortReadWrite = 0;
+ GPIOPortReadEnable = 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-05-07 23:41:55 +0000