Diff: ICE-Application/src/Drivers/rtc.cpp

Revision:

0:61364762ee0e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ICE-Application/src/Drivers/rtc.cpp	Tue Jan 24 19:05:33 2017 +0000
@@ -0,0 +1,159 @@
+// rtc.c - real time clock (MCP7940N)
+// -------------------------------------------------------------------------------------------------
+
+#include "mbed.h"
+#include "rtc.h"
+#include "global.h"
+
+// -------------------------------------------------------------------------------------------------
+// globals
+
+int rtc_verbose = 0;
+
+// -------------------------------------------------------------------------------------------------
+// initialization
+
+void rtc_init(void)
+{
+    if(rtc_verbose)
+    {
+        printf("\r\n[rtc_init] \r\n\r\n");
+    }
+    
+    char data[2];
+
+
+    data[0] = RTC_CONTROL_ADDR;
+
+    if(i2c->write(RTC_ADDR, data, RTC_SIZE_ADDR, true )) printf("no ack 1\r\n");
+    if(i2c->read (RTC_ADDR, data, RTC_SIZE_CONTROL, false)) printf("no ack 2\r\n");
+
+    if(rtc_verbose)
+    {
+        for(int i=0; i<RTC_SIZE_CONTROL; i++) { printf("   %d = ", i); printf("%d\r\n", data[i]); };
+    }
+
+    unsigned char control_reg = data[0];
+
+    if((control_reg & 0x80) == 1) // !EOSC
+    {
+        data[0] = RTC_CONTROL_ADDR;
+        data[1] = (control_reg & 0x7F); // clear !EOSC
+
+        if(i2c->write(RTC_ADDR, data, (RTC_SIZE_ADDR+RTC_SIZE_DATA), false)) printf("no ack 3\r\n");
+        
+        if(rtc_verbose) printf("   !EOSC bit reset (0x%x)\r\n\r\n", data[1]);
+    }
+
+    if(!rtc_verbose) printf("\r\nRTC: ");
+    rtc_print();
+}
+
+// -------------------------------------------------------------------------------------------------
+// read registers
+
+void rtc_regs(void)
+{
+    char data[RTC_SIZE_DATA];
+    
+    if(rtc_verbose)
+    {
+        printf("\r\n[rtc_regs] \r\n\r\n");
+    }
+
+    data[0] = 0x00; // address 0x00
+
+    if(i2c->write(RTC_ADDR, data, RTC_SIZE_ADDR, true )) printf("no ack 1\r\n");
+    if(i2c->read (RTC_ADDR, data, RTC_SIZE_DATA, false)) printf("no ack 2\r\n");
+
+    for(int i=0; i<RTC_SIZE_DATA; i++) { printf("   %d = ", i); printf("%d\r\n", data[i]); }
+}
+
+// -------------------------------------------------------------------------------------------------
+// RTC functions
+
+void rtc_get_time(int* iyr, int* imo, int* idy, int* ihr, int* imn, int* isc)
+{
+    char data[RTC_SIZE_DATA];
+    data[0] = 0x00;
+
+    if(i2c->write(RTC_ADDR, data, RTC_SIZE_ADDR, true )) printf("no ack 1\r\n");
+    if(i2c->read (RTC_ADDR, data, RTC_SIZE_DATA, false)) printf("no ack 2\r\n");
+
+    if(rtc_verbose)
+    {
+        printf("\r\n[rtc_get_time] \r\n\r\n");
+        for(int i=0; i<RTC_SIZE_DATA; i++) { printf("   %d = ", i); printf("%d\r\n", data[i]); };
+    }
+
+    *isc = 10*( (data[0] & 0x70)>>4 ) + (data[0] & 0x0F); // tens = 0b01110000(0x70), ones = 0b00001111(0x0F)
+    *imn = 10*( (data[1] & 0x70)>>4 ) + (data[1] & 0x0F); // tens = 0b01110000(0x70), ones = 0b00001111(0x0F)
+    *ihr = 10*( (data[2] & 0x10)>>4 ) + (data[2] & 0x0F); // tens = 0b00110000(0x30), ones = 0b00001111(0x0F)
+     // day of week
+    *idy = 10*( (data[4] & 0x30)>>4 ) + (data[4] & 0x0F); // tens = 0b00110000(0x30), ones = 0b00001111(0x0F)
+    *imo = 10*( (data[5] & 0x10)>>4 ) + (data[5] & 0x0F); // tens = 0b00010000(0x10), ones = 0b00001111(0x0F)
+    *iyr = 10*( (data[6] & 0xF0)>>4 ) + (data[6] & 0x0F); // tens = 0b11110000(0xF0), ones = 0b00001111(0x0F)
+    
+    *iyr += 2000;
+}
+
+void rtc_set_time(int iyr, int  imo, int  idy, int  ihr, int  imn, int  isc)
+{
+    char data[(RTC_SIZE_DATA+RTC_SIZE_ADDR)];
+    
+    int jyr = iyr; if(jyr >= 2000) jyr -= 2000;
+
+    data[0] = 0x00; // address byte
+    data[1] = 0x00; // data byte 0: seconds
+    data[2] = 0x00; // data byte 1: minutes
+    data[3] = 0x00; // data byte 2: hours
+    data[4] = 0x00; // data byte 3: weekday, set to 0x00 ? (usually reads 0x21 with OSCRUN and no PWRFAIL
+    data[5] = 0x00; // data byte 4: day
+    data[6] = 0x00; // data byte 5: month
+    data[7] = 0x00; // data byte 6: year
+
+    data[1] = ((isc/10)<<4) | (isc%10); // seconds
+    data[2] = ((imn/10)<<4) | (imn%10); // minutes
+    data[3] = ((ihr/10)<<4) | (ihr%10); // hours
+    data[5] = ((idy/10)<<4) | (idy%10); // days
+    data[6] = ((imo/10)<<4) | (imo%10); // months
+    data[7] = ((jyr/10)<<4) | (jyr%10); // years
+
+    if(i2c->write(RTC_ADDR, data, (RTC_SIZE_DATA+RTC_SIZE_ADDR), false)) printf("no ack\r\n");
+
+    if(rtc_verbose)
+    {
+        printf("\r\n[rtc_set_time] \r\n\r\n");
+        printf("   raw data\r\n");
+        for(int i=0; i<(RTC_SIZE_DATA+RTC_SIZE_ADDR); i++) { printf("   %d = ", i); printf("%d\r\n", data[i]); };
+    }
+}
+
+void rtc_set(const char* s)
+{
+    int iyr, imo, idy, ihr, imn, isc;
+
+    if(sscanf(s, "%d-%d-%d %d:%d:%d", &iyr, &imo, &idy, &ihr, &imn, &isc) != 6)
+    {
+        printf("   [rtc_set] parse error\r\n");
+    }
+    else
+    {
+        if(rtc_verbose) printf("   date: %04d-%02d-%02d %02d:%02d:%02d\r\n", iyr, imo, idy, ihr, imn, isc);
+
+        rtc_set_time(iyr, imo, idy, ihr, imn, isc);
+
+        printf("   [rtc_set] "); rtc_print();
+    }
+}
+
+void rtc_print(void)
+{
+    int iyr=0, imo=0, idy=0, ihr=0, imn=0, isc=0;
+
+    rtc_get_time(&iyr, &imo, &idy, &ihr, &imn, &isc);
+
+    printf("%04d-%02d-%02d %02d:%02d:%02d", iyr, imo, idy, ihr, imn, isc);
+}
+
+// -------------------------------------------------------------------------------------------------