commit f2bad1455f1224db7a69afae9fe6dd11f2338dcf
parent 626b31bb4b32b0d38a686e68cfc371a915a1e4f8
Author: Luxferre <lux@ferre>
Date: Sun, 31 Jul 2022 10:25:53 +0300
revamping datetime draft
Diffstat:
3 files changed, 56 insertions(+), 14 deletions(-)
diff --git a/README.md b/README.md
@@ -142,12 +142,27 @@ ID |Params |Command|Meaning
`03` |1s 3b [addr addr]|`a3` |Read a byte under the 3-byte flash address
`04` |1b 3b [page addr]|`84` |Write a page under the 3-byte flash address
`05` |1b 3b [page addr]|`85` |Read a page under the 3-byte flash address
-`06` |1s [addr] |`46` |Read the current system time/date information (5 bytes/40 bits, Unix time) into the address
-`07` |1s [addr] |`47` |Set the current system time/date information (5 bytes/40 bits, Unix time) from the address
+`06` |1s [addr] |`46` |Read the current system time/date information (see below) into the address
+`07` |1s [addr] |`47` |Set the current system time/date information (see below) from the address
`08-1d`| | |(reserved)
`1e` |1b 3b [flag addr]|`9e` |Load and run another Uxn/ESOP application from flash address according to the flags
`1f` |None |`1f` |Halt (required)
+### Datetime syscall implementation notes
+
+The `46` and `47` calls, where implemented, should operate on 10 bytes of memory addressed by the value passed to them.
+The layout of these 10 bytes is similar to the one defined in Uxn/Varvara and Uxn/SPARTA specs:
+
+- `00-01`: year
+- `02`: month
+- `03`: day
+- `04`: hour
+- `05`: minute
+- `06`: second
+- `07`: day of the week
+- `08-09`: day of the year
+- `0a`: DST flag for the local time
+
## Credits
Spec and reference implementation developed by Luxferre in 2022, released into the public domain.
diff --git a/web/esop-ext.js b/web/esop-ext.js
@@ -172,19 +172,48 @@ function ESOPExtensions() {
//syscalls
+ //thanks to Toastrackenigma for the idea
+ function isDST(d, y) {
+ var jan = new Date(y, 0, 1).getTimezoneOffset(),
+ jul = new Date(y, 6, 1).getTimezoneOffset()
+ return Math.max(jan, jul) !== d.getTimezoneOffset()
+ }
+ //thanks to user2501097 for the idea
+ function daysIntoYear(y, m, d) {
+ return (Date.UTC(y, m, d) - Date.UTC(y, 0, 0)) / 86400000
+ }
+
+ function fillDTbuf(addr) {
+ var now = new Date(),
+ year = now.getFullYear(),
+ month = now.getMonth() + 1,
+ day = now.getDate(),
+ hour = now.getHours(),
+ minute = now.getMinutes(),
+ second = now.getSeconds(),
+ dotw = now.getDay(),
+ doty = daysIntoYear(year, month - 1, day),
+ dstflag = 0|isDST(now, year)
+ vm.setram(addr, year >> 8)
+ vm.setram(addr+1, year&255)
+ vm.setram(addr+2, month)
+ vm.setram(addr+3, day)
+ vm.setram(addr+4, hour)
+ vm.setram(addr+5, minute)
+ vm.setram(addr+6, second)
+ vm.setram(addr+7, dotw)
+ vm.setram(addr+8, doty >> 8)
+ vm.setram(addr+9, doty&255)
+ vm.setram(addr+10, dstflag)
+
+ }
+
function runSyscall(vm, buf) {
var call = buf[0]
if(call === 0x00) //simulate writing a byte to the debug port
console.log('[DBG] ' + ('00' + buf[1].toString(16)).slice(-2))
- else if(call === 0x06) { //read datetime info into 5 bytes starting from addr
- //not very optimal but a future-proof approach for now
- var tm = ('00' + (0|(Date.now()/1000)).toString(16)).slice(-10).match(/.{2}/g).map(function(x){return parseInt(x, 16)}),
- targetaddr = (buf[1]<<8)|buf[2]
- vm.setram(targetaddr, tm[0])
- vm.setram(targetaddr+1, tm[1])
- vm.setram(targetaddr+2, tm[2])
- vm.setram(targetaddr+3, tm[3])
- vm.setram(targetaddr+4, tm[4])
+ else if(call === 0x06) { //read datetime info into 10 bytes starting from addr
+ fillDTbuf((buf[1]<<8)|buf[2])
}
else if(call === 0x1f) //halt call, required for all implementations
vm.active = false
diff --git a/web/esop-web-app.js b/web/esop-web-app.js
@@ -4,15 +4,13 @@ function main() {
var devCfg = {
audio: null,
canvas: document.getElementById('C') //JS-specific implementation canvas DOM reference
- }
+ }, vm = UxnCore(), ext = ESOPExtensions()
document.getElementById('apprun').addEventListener('click', function() {
var fileObj = document.getElementById('appselect').files[0]
if(fileObj.name.endsWith('.eso')) {
var rdr = new FileReader()
rdr.onload = function() {
- var vm = UxnCore()
- var ext = ESOPExtensions()
devCfg.audio = new (window.AudioContext || window.webkitAudioContext)
vm.boot()
ext.setup(vm, devCfg)
