using a RTC in SF basic

[MrDEB]

I have a DS-1302 RTC module but how to use it?
I recall Jon Chandler made a vu meter clock but what he used for timing?
Am planning on a clock that has no hands, just LEDs but precision would be nice.

 

[MrDEB]

several members use SF coding but where is an example for using the 74hc595?
Am basically STUCK at this point.
I have a test board but what sequence do I press buttons to work?
see post https://www.electro-tech-online.com/threads/using-a-rtc-in-sf-basic.166376/post-1460573

 

[MrDEB]

doing more research, it looks like the TM1637 is similar to the 74hc595
Popcorn did a project using the TM1637.
Wonder if the code was done in SF

 

[be80be]

guess they left you alone in the dark

 

[be80be]

How did you get that idea the tm1637 is nothing like the 74hc595

 

[MrDEB]

it sounds similar

 

[be80be]

There not ones more like a port extender it reads switch press and lights leds

 

[Nigel Goodwin]

it sounds similar

It's not even vaguely similar - the TM1637 is an LED display driver, a 74HC595 is a simple TTL/CMOS logic latch.

The 74HC595 is absolutely trivial to drive, if you can't do that simple job (when you've even been given all the code) you don't have much of a chance.

 

[tumbleweed]

// mrd 74HC595 TEST BOARD2
Device = 18F43K22
Clock = 8

// int osc and IO pin libraries
Include "intosc.bas"
#option DIGITALIO_INIT = true       // automatically call setalldigital
Include "setdigitalio.bas"
Include "SHIFT.BAS"

Dim LATCH As PORTB.4        // hc595 pin 12 LCHCLK
Dim DATA As PORTA.1         // hc595 pin 14 SDI
Dim CLK As PORTB.3          // hc595 pin 11 SFTCLK
Dim RST As PORTB.1          // hc595 pin 10 RSTn (no connection to pcb)
Dim SDO As PORTA.4          // hc595 pin 9 SDO QH' shift out

Dim Leds As Byte

// set pin modes
Shift.SetOutput(DATA)
Shift.SetClock(CLK)
Shift.SetInput(SDO)
high(RST)
low(LATCH)
 

 // if there was a connection...
low(RST)
delayus(100)
high(RST)


// cycle leds
leds = 0
while (true)
    if (leds = 0) then
        leds = 1
    endif
    Shift.Out(MSB_FIRST, DATA, 8)
    LATCH = 1
    LATCH = 0
    delayms(250)
    leds = leds << 1
end while

 

[MrDEB]

thanks Tumbleweed
Will try it out

 

[tumbleweed]

You'll need to switch the CLK and DATA assignments for shift... my mistake

 

[MrDEB]

already made the changes. Adding a PWM routine to the mix.
At present I have 2 separate DATA lines.

 

[be80be]

Adding a PWM routine to the mix why?

 

[MrDEB]

this project has changed its desired outcome kind of. https://www.electro-tech-online.com/threads/using-a-rtc-in-sf-basic.166376/post-1457998
FIRST the LED clock is going to use the schematic from post #173 as an example if I can do the mosfets correctly gezz
zzzz the present form of this is going to be a Christmas themed lighted ornament.
A snowflake, a Christmas tree (Jons idea) or redesign the Christmas star I made couple years ago that was designed wrong (2 LEDs in Parallel with 1 resistor)
The Christmashttps://www.electro-tech-online.com/threads/using-a-rtc-in-sf-basic.166376/post-1460076 tree idea

 

[be80be]

You can scan the 74hc595 no need for pwm
or toggle the OR pin

 

[MrDEB]

after layout parts I see the 74hc595's are a bit tooo wide'
contemplating using the smd mosfets but have several LEDs connected.
am looking at 96 leds The shift regesters don't fit to well between the leds of the snowflake

 

[MrDEB]

rethinking and going to continue with present design

 

[ChrisP58]

after layout parts I see the 74hc595's are a bit tooo wide'
contemplating using the smd mosfets but have several LEDs connected.
am looking at 96 leds The shift regesters don't fit to well between the leds of the snowflake

The 74hc595 is available in multiple SMD packages, some of which are pretty small. Check other sizes before you reject that plan.

From DigiKey,

 

[MrDEB]

thanks for the suggestions but all of them are 5mm or more. too wide.

 

[MrDEB]

Redid the the schematic where I only have 6 - 74hc595. the snowflake is only 100mm wide so I can't have ANY cutouts.
Thinking of having additional LATCH, DATA, PWM1, PWM2, ETC. Wondering if having multiple ports with same name might be an issue?
I lay's out on the pcb better but?