1 files changed, 106 insertions, 0 deletions
diff --git a/avr/pcf8583.c b/avr/pcf8583.c
new file mode 100644
index 0000000..d33c9b0
--- /dev/null
+++ b/avr/pcf8583.c
@@ -0,0 +1,106 @@
+/*
+ * Date & Time support for Philips PCF8583 RTC
+ */
+
+/* #define	DEBUG	*/
+
+#include "common.h"
+#include <stdlib.h>
+#include "debug.h"
+#include "command.h"
+#include "rtc.h"
+#include "i2c.h"
+
+#define REG_CS		0x00	/* control/status */
+#define REG_CSEC	0x01	/* hundredth of a second */
+#define REG_SEC		0x02	/* seconds */
+#define REG_MIN		0x03	/* minutes */
+#define REG_HOUR	0x04	/* hours */
+#define REG_YRDATE	0x05	/* year/date */
+#define REG_WDMON	0x06	/* weekdays/months */
+#define NR_OF_REGS	7
+
+
+/* ------------------------------------------------------------------------- */
+
+static uint_fast8_t bcd2bin(uint8_t val)
+{
+	return (val >> 4) * 10 + (val & 0x0f);
+}
+
+static uint8_t bin2bcd (uint_fast8_t val)
+{
+	div_t d = div(val, 10);
+	
+	return (d.quot << 4) | d.rem;
+}
+
+
+int rtc_get (struct rtc_time *tmp)
+{
+	int rel = 0;
+	uint8_t rtcbuf[NR_OF_REGS];
+	uint16_t year;
+	
+	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, NR_OF_REGS);
+	i2c_read(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &year, 2);
+
+	debug("Get RTC year: %u, year/date: %02x, wdays/month: %02x, "
+		"hour: %02x, min: %02x, sec: %02x, (stat: %02x)\n", year,
+		rtcbuf[6], rtcbuf[5], rtcbuf[4], rtcbuf[3], rtcbuf[2], rtcbuf[0]);
+
+	tmp->tm_sec  = bcd2bin (rtcbuf[REG_SEC]    & 0x7F);
+	tmp->tm_min  = bcd2bin (rtcbuf[REG_MIN]    & 0x7F);
+	tmp->tm_hour = bcd2bin (rtcbuf[REG_HOUR]   & 0x3F);
+	tmp->tm_mday = bcd2bin (rtcbuf[REG_YRDATE] & 0x3F);
+	tmp->tm_mon  = bcd2bin (rtcbuf[REG_WDMON]  & 0x1F);
+	while (year%4 < (rtcbuf[REG_YRDATE]>>6)) {
+		year++;
+		/* TODO: update RTC ram */
+	}
+	tmp->tm_year  = year; 
+	tmp->tm_wday = rtcbuf[REG_WDMON] >> 5;
+	tmp->tm_yday = 0;
+	tmp->tm_isdst= 0;
+
+
+	debug ( "Get DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	return rel;
+}
+
+int rtc_set (struct rtc_time *tmp)
+{
+	uint8_t rtcbuf[NR_OF_REGS];
+
+	debug ( "Set DATE: %4d-%02d-%02d (wday=%d)  TIME: %2d:%02d:%02d\n",
+		tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
+		tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
+
+	rtcbuf[REG_CS] = 0x84;
+	rtcbuf[REG_CSEC] = 0x00;
+	rtcbuf[REG_WDMON ] = bin2bcd(tmp->tm_mon) | ((tmp->tm_wday) << 5);
+	rtcbuf[REG_YRDATE] = ((tmp->tm_year % 4) << 6) | bin2bcd(tmp->tm_mday);
+	rtcbuf[REG_HOUR  ] = bin2bcd(tmp->tm_hour);
+	rtcbuf[REG_MIN   ] = bin2bcd(tmp->tm_min);
+	rtcbuf[REG_SEC   ] = bin2bcd(tmp->tm_sec);
+
+	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0,    1, rtcbuf, NR_OF_REGS);
+	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0x10, 1, (uint8_t *) &tmp->tm_year, 2);
+	rtcbuf[REG_CS] = 0x04;
+	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, rtcbuf, 1);
+
+
+	return 0;
+}
+
+void rtc_reset (void)
+{
+	uint8_t c = 0;
+	
+	i2c_write(CONFIG_SYS_I2C_RTC_ADDR, 0, 1, &c, 1);
+}
+
+