ST7Lite29 and DS18B20 - 1Wire

marek2 · ‎2005-11-07

Posted on November 07, 2005 at 14:43

marek2 · ‎2005-05-15

Posted on May 15, 2005 at 14:25

Hello

Where can I find any software libraries to 1-Wire protocol?

I make device with ST7Lite29, and have some problems with implementation 1-wire protocol in Cosmic C compiler 4k version.

I set PA7 or PB6 as 1-wire-pin - open drain output, and I have problem with read state of 1-wire-pin. It always is ''1''. If I link 1-wire-pin to GND, when I read PADR (or PBDR) i always receive ''1''.

And I have question:

If quartz is 16MHz, mcu clock is 8MHz? 1 clock cycle is 0,125 us, 1 machine cycle is 2 clock cycle = 0,25 us, and instruction time is 1 to 3 machine cycles? It's good ?

Marek

yu-jun · ‎2005-05-15

Posted on May 15, 2005 at 23:53

Can you put the codes and graph of MCU and DS18b20? I have used ST72324 to read DS18b20 and it runs OK..

marek2 · ‎2005-05-17

Posted on May 17, 2005 at 18:48

The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6je&d=%2Fa%2F0X0000000buG%2FK4fvfsMBYbMN35nezdlJHNeAVfc1Zr.QJMqs91nuVWE&asPdf=false

yu-jun · ‎2005-05-19

Posted on May 20, 2005 at 00:09

I check your codes, there are OK except the delay time, I have no demo board to check the wave using oscillograph. I think that you should modify delay time. When I program DS18b20, the problem happened too, after I modify the delay time to fit the datasheet figure, it dispeared.

if you have any question, please put it.

by the way, I write assemble code to read DS18b20. if you want to get it. I would put it on the forum(quartz is 8MHz, mcu clock is 4MHz).

[ This message was edited by: DiDiDuDu on 20-05-2005 03:41 ]

marek2 · ‎2005-05-19

Posted on May 20, 2005 at 06:43

OK - put your code on the forum, I will use it willfully. I think, that other ST7 programers also.

Regards

Marek

yu-jun · ‎2005-05-22

Posted on May 23, 2005 at 04:41

The original post was too long to process during our migration. Please click on the provided URL to read the original post. https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I6pB&d=%2Fa%2F0X0000000bwG%2Fd21CaTr62T.ntPoX6rtRzFzQiukn4MONjAYQAkvCFpI&asPdf=false