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@feesta
Last active Dec 18, 2015
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Hello World for Max72xx and a 4 digit 7-segment display (Electric Imp device code)
// Hello World for Max72xx and a 4 digit 7-segment display (Electric Imp device code)
hardware.pin7.configure(DIGITAL_OUT);
hardware.spi189.configure(SIMPLEX_TX, 10000);
function send(data) {
hardware.pin7.write(0); // set CS before sending data
hardware.spi189.write(data);
hardware.pin7.write(1); // release CS after sending data
}
function configure() {
send("\x0C\x00"); // shutdown on
//send("\x0F\x01"); // display_test on
send("\x0F\x00"); // display_test normal
send("\x09\x0F"); // decode mode
send("\x0A\x0F"); // intensity
send("\x0B\x03"); // scanlimit
send("\x0C\x01"); // shutdown normal
}
configure();
function blankDisplay() {
send("\x01\x0F");
send("\x02\x0F");
send("\x03\x0F");
send("\x04\x0F");
}
blankDisplay();
function getNumberByte(digit, num) {
local digit_blob = blob(2);
digit_blob.writen(digit, 'b');
digit_blob.writen(num, 'b');
return digit_blob;
}
function sendNumber(num) {
local digit1 = num % 10;
send(getNumberByte(4, digit1));
local digit2 = (num / 10) % 10;
send(getNumberByte(3, digit2));
local digit3 = (num / 100) % 10;
send(getNumberByte(2, digit3));
local digit4 = (num / 1000) % 10;
send(getNumberByte(1, digit4));
//server.log(num);
}
local vv = 0;
function counter() {
vv = vv + 1;
sendNumber(vv);
imp.wakeup(0.03, counter);
}
counter();
// watchdog keeps the imp from going to sleep
function watchdog() {
imp.wakeup(5*60, watchdog);
server.log("watchdog");
}
watchdog();
imp.configure("4 Digit Display", [], []);
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