Diff: extrtc.cpp

Revision:

8:45a0205a298f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/extrtc.cpp	Thu Dec 06 11:40:19 2018 +0000
@@ -0,0 +1,81 @@
+#include "mbed.h"
+
+static SPI device(p5, p6, p7); // mosi, miso, sclk
+static DigitalOut cs(p8, 1);   // ssel
+
+/*
+| BIT 7 | BIT 6 | BIT 5 | BIT 4 | BIT 3 | BIT 2 | BIT 1 | BIT 0 |
++-------+-------+-------+-------+-------+-------+-------+-------+
+|   -   |          10 Seconds   |             Seconds           | 00–59
++-------+-------+-------+-------+-------+-------+-------+-------+
+|   -   |          10 Minutes   |             Minutes           | 00–59
++-------+-------+-------+-------+-------+-------+-------+-------+
+|   -   |   -   |  10 Hours     |             Hours             | 00-23
++-------+-------+-------+-------+-------+-------+-------+-------+
+|   -   |   -   |   -   |   -   |   -   |     Weekday           |  1-7
++-------+-------+-------+-------+-------+-------+-------+-------+
+|   -   |   -   |  10 Days      |             Days              | 01-31
++-------+-------+-------+-------+-------+-------+-------+-------+
+|Century|   -   |   -   | 10 Mo |             Months            | 01-12
++-------+-------+-------+-------+-------+-------+-------+-------+
+|                  10 Years     |             Years             | 00-99
++-------+-------+-------+-------+-------+-------+-------+-------+
+*/
+static char bcdToInt(char bcd)
+{
+    return 0;
+}
+static char intToBcd(char i)
+{
+    return 0;
+}
+void ExtRtcSet(struct tm *ptm)
+{
+    char bcd;
+    cs = 0;
+    device.write(0x80); //Send address 00h
+    bcd = intToBcd(ptm->tm_sec ); device.write(bcd);
+    bcd = intToBcd(ptm->tm_min ); device.write(bcd);
+    bcd = intToBcd(ptm->tm_hour); device.write(bcd);
+    bcd =          ptm->tm_wday;  device.write(bcd);
+    bcd = intToBcd(ptm->tm_mday); device.write(bcd);
+    int year = ptm->tm_year;
+    bcd = intToBcd(ptm->tm_mon);
+    if (year > 99) bcd |= 0x80;
+    device.write(bcd);
+    if (year > 99) year -=100;
+    bcd = intToBcd(year);
+    device.write(bcd);
+    cs = 1;
+}
+void ExtRtcGet(struct tm *ptm)
+{
+    char bcd;
+    cs = 0;
+    device.write(0x00); //Send address 00h
+    bcd = device.write(0xFF); ptm->tm_sec  = bcdToInt(bcd);
+    bcd = device.write(0xFF); ptm->tm_min  = bcdToInt(bcd);
+    bcd = device.write(0xFF); ptm->tm_hour = bcdToInt(bcd);
+    bcd = device.write(0xFF); ptm->tm_wday = bcd;
+    bcd = device.write(0xFF); ptm->tm_mday = bcdToInt(bcd);
+    bcd = device.write(0xFF);
+    int century = bcd & 0x80;
+    bcd &= 0x7F;
+    ptm->tm_mon  = bcdToInt(bcd);
+    bcd = device.write(0xFF);
+    ptm->tm_year = bcdToInt(bcd);
+    if (century) ptm->tm_year += 100;
+    cs = 1;
+}
+
+int ExtRtcMain()
+{
+    return 0;
+}
+int ExtRtcInit()
+{
+    cs = 1;
+    device.format(8, 1);
+    device.frequency(1000000);
+    return 0;
+}
\ No newline at end of file