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#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)))
#define RTC_DATETIME_BUF(info, index) (*((u8 *)(info) + OFFSET_YEAR + (index)))
#define RTC_DATETIME_BUF_LEN (OFFSET_SECOND - OFFSET_YEAR + 1)
#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 GPIOPortReadEnable;
extern bool8 gRtcLocked;
s32 RTC_WriteCommand(u8 value);
s32 RTC_WriteData(u8 value);
u8 RTC_ReadData();
void RTC_EnableGpioPortRead();
void RTC_DisableGpioPortRead();
void RTC_Unprotect()
{
RTC_EnableGpioPortRead();
gRtcLocked = FALSE;
}
void RTC_Protect()
{
RTC_DisableGpioPortRead();
gRtcLocked = TRUE;
}
u8 RTC_Probe()
{
u8 errorCode;
struct RtcInfo rtc;
if (!RTC_GetControl(&rtc))
return 0;
errorCode = 0;
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;
errorCode++;
}
RTC_GetTime(&rtc);
if (rtc.second & 0x80)
{
if (!RTC_Reset())
return (errorCode << 4) & 0xF0;
errorCode++;
}
return (errorCode << 4) | 1;
}
bool8 RTC_Reset()
{
u8 result;
struct RtcInfo rtc;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_RESET);
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
rtc.control = RTC_INFO_CTRL_24HOUR;
result = RTC_SetControl(&rtc);
return result;
}
bool8 RTC_GetControl(struct RtcInfo *rtc)
{
u8 controlData;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_RD_CONTROL);
GPIOPortDirection = 5;
controlData = RTC_ReadData();
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;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_SetControl(struct RtcInfo *rtc)
{
u8 controlData;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
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_WriteCommand(RTC_CMD_WR_CONTROL);
RTC_WriteData(controlData);
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_GetDateTime(struct RtcInfo *rtc)
{
u8 i;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_RD_DATETIME);
GPIOPortDirection = 5;
for (i = 0; i < RTC_DATETIME_BUF_LEN; i++)
RTC_DATETIME_BUF(rtc, i) = RTC_ReadData();
RTC_BUF(rtc, OFFSET_HOUR) &= 0x7F;
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_SetDateTime(struct RtcInfo *rtc)
{
u8 i;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_WR_DATETIME);
for (i = 0; i < RTC_DATETIME_BUF_LEN; i++)
RTC_WriteData(RTC_DATETIME_BUF(rtc, i));
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_GetTime(struct RtcInfo *rtc)
{
u8 i;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_RD_TIME);
GPIOPortDirection = 5;
for (i = 0; i < RTC_TIME_BUF_LEN; i++)
RTC_TIME_BUF(rtc, i) = RTC_ReadData();
RTC_BUF(rtc, OFFSET_HOUR) &= 0x7F;
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_SetTime(struct RtcInfo *rtc)
{
u8 i;
if (gRtcLocked == TRUE)
return FALSE;
gRtcLocked = TRUE;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_WR_TIME);
for (i = 0; i < RTC_TIME_BUF_LEN; i++)
RTC_WriteData(RTC_TIME_BUF(rtc, i));
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
bool8 RTC_SetUnknownData(struct RtcInfo *rtc)
{
u8 i;
u8 a[2];
if (gRtcLocked == TRUE)
return FALSE;
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] < 12)
a[0] = rtc->unknown1;
else
a[0] = rtc->unknown1 | 0x80;
a[1] = rtc->unknown2;
GPIOPortData = 1;
GPIOPortData = 5;
GPIOPortDirection = 7;
RTC_WriteCommand(RTC_CMD_WR_UNKNOWN);
for (i = 0; i < 2; i++)
RTC_WriteData(a[i]);
GPIOPortData = 1;
GPIOPortData = 1;
gRtcLocked = FALSE;
return TRUE;
}
s32 RTC_WriteCommand(u8 value)
{
u8 i;
u8 temp;
for (i = 0; i < 8; i++)
{
temp = ((value >> (7 - i)) & 1);
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 5;
}
// control reaches end of non-void function
}
s32 RTC_WriteData(u8 value)
{
u8 i;
u8 temp;
for (i = 0; i < 8; i++)
{
temp = ((value >> i) & 1);
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 4;
GPIOPortData = (temp << 1) | 5;
}
// control reaches end of non-void function
}
u8 RTC_ReadData()
{
u8 i;
u8 temp;
u8 value;
for (i = 0; i < 8; i++)
{
GPIOPortData = 4;
GPIOPortData = 4;
GPIOPortData = 4;
GPIOPortData = 4;
GPIOPortData = 4;
GPIOPortData = 5;
temp = ((GPIOPortData & 2) >> 1);
value = (value >> 1) | (temp << 7); // UB: accessing uninitialized var
}
return value;
}
void RTC_EnableGpioPortRead()
{
GPIOPortReadEnable = 1;
}
void RTC_DisableGpioPortRead()
{
GPIOPortReadEnable = 0;
}
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