Ian Tindale / Mbed 2 deprecated SPIVFDclock

Driving a 20T202DA2JA VFD, using the (powered) RTC, pressing a button to ask the user to enter the date details over serial, displaying the date on the VFD. Now with added ethernet and NTP to update the time automatically on startup.

Dependencies:   EthernetNetIf mbed DNSResolver NTPClientMin

main.cpp@2:f33d74cebc4c, 2010-12-12 (annotated)

Committer:
u0421793
Date:
Sun Dec 12 01:07:29 2010 +0000
Revision:
2:f33d74cebc4c
Parent:
1:abc0162903bf
Child:
3:7dcce0aa2535
Changed CS on VFD to pin 10, changed time set button to pin 11. Because mbed is now sitting in a coolcomponents mbed LPC1768 Workshop Development Board (version 2), and the sd card and usb would conflict with the previous pin assignments.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
u0421793 0:3ba54e2bf65d 1 #include "mbed.h"
u0421793 0:3ba54e2bf65d 2
u0421793 0:3ba54e2bf65d 3 // rudimentary driving of a 20T202DA2JA vacuum fluorescent display, 20 chars x 2 lines
u0421793 0:3ba54e2bf65d 4 // display has 5 pins
u0421793 0:3ba54e2bf65d 5 // 1 - green - GND
u0421793 0:3ba54e2bf65d 6 // 2 - yellow - Vcc
u0421793 0:3ba54e2bf65d 7 // 3 - orange - SIO - serial data - MOSI - p5
u0421793 2:f33d74cebc4c 8 // 4 - red - /STB - active low device select - p10
u0421793 0:3ba54e2bf65d 9 // 5 - brown - SCK - serial clock - sclk - p7
u0421793 0:3ba54e2bf65d 10
u0421793 1:abc0162903bf 11 // Also, I have fitted a battery on my breadboard to the RTC, to keep the time across power downs.
u0421793 1:abc0162903bf 12
u0421793 0:3ba54e2bf65d 13 // VFD
u0421793 0:3ba54e2bf65d 14 SPI spi(p5, p6, p7); // mosi, miso, sclk (miso not used by display)
u0421793 2:f33d74cebc4c 15 DigitalOut cs(p10); // chip select (active low)
u0421793 0:3ba54e2bf65d 16
u0421793 1:abc0162903bf 17 // button (push)
u0421793 2:f33d74cebc4c 18 DigitalIn set_the_time_button (p11); // “set the time” button (active low, pullup resistor)
u0421793 1:abc0162903bf 19
u0421793 0:3ba54e2bf65d 20 void DATA(unsigned char displaying) {
u0421793 0:3ba54e2bf65d 21 // Select the device by setting chip select low
u0421793 0:3ba54e2bf65d 22 cs = 0;
u0421793 0:3ba54e2bf65d 23 spi.write(0xfa);
u0421793 0:3ba54e2bf65d 24 spi.write(displaying);
u0421793 0:3ba54e2bf65d 25 // Deselect the device
u0421793 0:3ba54e2bf65d 26 cs = 1;
u0421793 0:3ba54e2bf65d 27 }
u0421793 0:3ba54e2bf65d 28
u0421793 0:3ba54e2bf65d 29 void COM(unsigned char telling) {
u0421793 0:3ba54e2bf65d 30 // Select the device by setting chip select low
u0421793 0:3ba54e2bf65d 31 cs = 0;
u0421793 0:3ba54e2bf65d 32 spi.write(0xf8);
u0421793 0:3ba54e2bf65d 33 spi.write(telling);
u0421793 0:3ba54e2bf65d 34 // Deselect the device
u0421793 0:3ba54e2bf65d 35 cs = 1;
u0421793 0:3ba54e2bf65d 36 }
u0421793 0:3ba54e2bf65d 37
u0421793 0:3ba54e2bf65d 38 void INITIALISE_DISPLAY() {
u0421793 0:3ba54e2bf65d 39 COM(0x01); //clear all display and set DD-RAM address 0 in address counter
u0421793 0:3ba54e2bf65d 40 COM(0x02); //move cursor to the original position
u0421793 0:3ba54e2bf65d 41 COM(0x06); //set the cursor direction increment and cursor shift enabled
u0421793 0:3ba54e2bf65d 42 COM(0x38); //set 8bit operation,2 line display and 100% brightness level
u0421793 0:3ba54e2bf65d 43 COM(0x80); //set cursor to the first position of 1st line
u0421793 0:3ba54e2bf65d 44 COM(0x0c); //set display on,cursor on,blinking off
u0421793 0:3ba54e2bf65d 45 }
u0421793 0:3ba54e2bf65d 46
u0421793 1:abc0162903bf 47 tm ASK_FOR_THE_TIME(struct tm t) {
u0421793 0:3ba54e2bf65d 48 // get the current time from the terminal by asking the user to enter
u0421793 0:3ba54e2bf65d 49 // unfortunately, there's no echo back, so they can't see what they type
u0421793 1:abc0162903bf 50
u0421793 0:3ba54e2bf65d 51 //year
u0421793 0:3ba54e2bf65d 52 printf("Enter year:\n"); // ask to enter year
u0421793 0:3ba54e2bf65d 53 printf("YYYY[enter]\n"); // as YYYY
u0421793 0:3ba54e2bf65d 54 scanf("%d", &t.tm_year); // put the typing into here
u0421793 0:3ba54e2bf65d 55
u0421793 0:3ba54e2bf65d 56 //month
u0421793 0:3ba54e2bf65d 57 printf("Enter month:\n"); // ask to enter month
u0421793 0:3ba54e2bf65d 58 printf("MM[enter]\n"); // as MM
u0421793 0:3ba54e2bf65d 59 scanf("%d", &t.tm_mon); // put the typing into here
u0421793 0:3ba54e2bf65d 60
u0421793 0:3ba54e2bf65d 61 //date
u0421793 0:3ba54e2bf65d 62 printf("Enter date:\n"); // ask to enter date
u0421793 0:3ba54e2bf65d 63 printf("DD[enter]\n"); // as DD
u0421793 0:3ba54e2bf65d 64 scanf("%d", &t.tm_mday); // put the typing into here
u0421793 0:3ba54e2bf65d 65
u0421793 0:3ba54e2bf65d 66 //hours
u0421793 0:3ba54e2bf65d 67 printf("Enter hours:\n"); // ask to enter hours
u0421793 0:3ba54e2bf65d 68 printf("HH[enter]\n"); // as HH
u0421793 0:3ba54e2bf65d 69 scanf("%d", &t.tm_hour); // put the typing into here
u0421793 0:3ba54e2bf65d 70
u0421793 0:3ba54e2bf65d 71 //minutes
u0421793 0:3ba54e2bf65d 72 printf("Enter minutes:\n"); // ask to enter minutes
u0421793 0:3ba54e2bf65d 73 printf("MM[enter]\n"); // as MM
u0421793 0:3ba54e2bf65d 74 scanf("%d", &t.tm_min); // put the typing into here
u0421793 0:3ba54e2bf65d 75
u0421793 0:3ba54e2bf65d 76 //seconds
u0421793 0:3ba54e2bf65d 77 printf("Enter seconds:\n"); // ask to enter seconds
u0421793 0:3ba54e2bf65d 78 printf("SS[enter]\n"); // as SS
u0421793 0:3ba54e2bf65d 79 scanf("%d", &t.tm_sec); // put the typing into here
u0421793 0:3ba54e2bf65d 80
u0421793 0:3ba54e2bf65d 81 // adjust for tm structure required values
u0421793 0:3ba54e2bf65d 82 t.tm_year = t.tm_year - 1900;
u0421793 0:3ba54e2bf65d 83 t.tm_mon = t.tm_mon - 1;
u0421793 0:3ba54e2bf65d 84
u0421793 0:3ba54e2bf65d 85 // set the time
u0421793 0:3ba54e2bf65d 86 set_time(mktime(&t));
u0421793 0:3ba54e2bf65d 87 //set_time(1289676600); // Set RTC time to Sat, 13 Nov 2010 19:30:00 in case of testing
u0421793 0:3ba54e2bf65d 88
u0421793 1:abc0162903bf 89 return t;
u0421793 1:abc0162903bf 90
u0421793 1:abc0162903bf 91 }
u0421793 1:abc0162903bf 92 // spare display testing string
u0421793 1:abc0162903bf 93 // char theString[41] = {"20T202DA2JA VFD driven by mbed using SPI"}; // forty characters max
u0421793 1:abc0162903bf 94 char timeStringTop[21], timeStringBottom1[3], timeStringBottom2[17]; // string to put the time representation into
u0421793 1:abc0162903bf 95
u0421793 1:abc0162903bf 96 char day_suffix[3] = "th"; // suffix string for days like 1st 2nd 3rd
u0421793 1:abc0162903bf 97 char first[3]= "st", second[3] = "nd", third[3] = "rd"; // holding strings for the suffixes
u0421793 1:abc0162903bf 98
u0421793 1:abc0162903bf 99 int main() {
u0421793 1:abc0162903bf 100 // Setup the spi for 8 bit data, high steady state clock,
u0421793 1:abc0162903bf 101 // second edge capture, with a 1MHz clock rate
u0421793 1:abc0162903bf 102 spi.format(8,3); // set SPI mode
u0421793 1:abc0162903bf 103 spi.frequency(1000000);
u0421793 1:abc0162903bf 104
u0421793 1:abc0162903bf 105 INITIALISE_DISPLAY(); // call the function that initialises the VFD
u0421793 1:abc0162903bf 106
u0421793 0:3ba54e2bf65d 107 while (1) {
u0421793 1:abc0162903bf 108 struct tm t;
u0421793 1:abc0162903bf 109
u0421793 1:abc0162903bf 110 if (set_the_time_button == false) {
u0421793 1:abc0162903bf 111 ASK_FOR_THE_TIME(t);
u0421793 1:abc0162903bf 112 }
u0421793 0:3ba54e2bf65d 113
u0421793 0:3ba54e2bf65d 114 time_t rtc_seconds = time(NULL); // somehow gets the current amount of seconds, evah!
u0421793 0:3ba54e2bf65d 115
u0421793 1:abc0162903bf 116 int i = 0; // initalise the character steppers
u0421793 1:abc0162903bf 117
u0421793 1:abc0162903bf 118 // build the two lines of the display separately
u0421793 1:abc0162903bf 119 strftime(timeStringTop, 20, "%X %A %p ", localtime(&rtc_seconds)); // put the hours:minutes:seconds, then full day, then am/pm
u0421793 1:abc0162903bf 120
u0421793 1:abc0162903bf 121 COM(0x80); // first line
u0421793 1:abc0162903bf 122 for (i=0; i<20; i++) {
u0421793 1:abc0162903bf 123 DATA(timeStringTop[i]); // step through the top line
u0421793 1:abc0162903bf 124 }
u0421793 1:abc0162903bf 125
u0421793 1:abc0162903bf 126 // this builds the second line in three pieces
u0421793 1:abc0162903bf 127 strftime(timeStringBottom1, 2, "%e", localtime(&rtc_seconds)); // put the date in
u0421793 1:abc0162903bf 128 strftime(timeStringBottom2, 16, " %B %Y ", localtime(&rtc_seconds)); // put a space then the full month then the year then spaces
u0421793 1:abc0162903bf 129
u0421793 0:3ba54e2bf65d 130 // first do a quick check to see if our date needs a 'st'; 'nd'; 'rd' or 'th' suffix
u0421793 1:abc0162903bf 131 if ((t.tm_mday < 10) | (t.tm_mday > 20)) { // if the date is below the 10th or above the 20th
u0421793 0:3ba54e2bf65d 132 switch (t.tm_mday%10) {
u0421793 0:3ba54e2bf65d 133 case 1:
u0421793 0:3ba54e2bf65d 134 strcpy (day_suffix,first); // is it a day that needs a "st"?
u0421793 0:3ba54e2bf65d 135 break;
u0421793 0:3ba54e2bf65d 136 case 2:
u0421793 0:3ba54e2bf65d 137 strcpy (day_suffix,second); // is it a day that needs a "nd"
u0421793 0:3ba54e2bf65d 138 break;
u0421793 0:3ba54e2bf65d 139 case 3:
u0421793 0:3ba54e2bf65d 140 strcpy (day_suffix,third); // is it a day that needs a "rd"
u0421793 0:3ba54e2bf65d 141 break;
u0421793 0:3ba54e2bf65d 142 default:
u0421793 0:3ba54e2bf65d 143 break; // leave 'day_suffix' saying "th" then.
u0421793 0:3ba54e2bf65d 144 }
u0421793 0:3ba54e2bf65d 145 }
u0421793 0:3ba54e2bf65d 146
u0421793 0:3ba54e2bf65d 147 COM(0xc0); // second line
u0421793 0:3ba54e2bf65d 148 for (i=0; i<2; i++) {
u0421793 0:3ba54e2bf65d 149 DATA(timeStringBottom1[i]); // step through the first part of the bottom line
u0421793 0:3ba54e2bf65d 150 }
u0421793 0:3ba54e2bf65d 151 for (i=0; i<2; i++) {
u0421793 0:3ba54e2bf65d 152 DATA(day_suffix[i]); // then add the day suffix
u0421793 0:3ba54e2bf65d 153 }
u0421793 0:3ba54e2bf65d 154 for (i=0; i<17; i++) {
u0421793 0:3ba54e2bf65d 155 DATA(timeStringBottom2[i]); // finish stepping through the bottom line
u0421793 0:3ba54e2bf65d 156 }
u0421793 0:3ba54e2bf65d 157
u0421793 0:3ba54e2bf65d 158 wait(1);
u0421793 0:3ba54e2bf65d 159 }
u0421793 0:3ba54e2bf65d 160
u0421793 0:3ba54e2bf65d 161 }