RTOS: Can TI platform handle one-wire protocol?

chenkun chuang

Prodigy 210 points

Tool/software: TI-RTOS

Hi,

I am trying to implement one-wire protocol for m3.

Basically, we want to use microcontroller to talk to one-wire eeprom.

And one-wire protocol is happening in 60us to 80us range.

However, in M3 config file, i saw this,

* Default value is family dependent. For example, Linux systems often only
* support a minimum period of 10000 us and multiples of 10000 us.
* TI platforms have a default of 1000 us.
*/
Clock.tickPeriod = 1000;

Q1: Can TI platform handle us operations?

Q2: if it can, does TI have any example for one-wire?

Thanks.

over 7 years ago

0 Sudharsanan over 7 years ago

TI__Expert 5401 points

Hi,

which is the TI device you are planning to use?

0 chenkun chuang over 7 years ago in reply to Sudharsanan

Prodigy 210 points

I am not sure if i have device name correctly.

It's Concerto F28M36x.

0 Mark Labbato over 7 years ago in reply to chenkun chuang

Guru 30330 points

Chenkun,

1) It is possible to change the tick period. You will need to determine what your minimum tick rate is in order for your system to operate properly.

2) C2000 Does not natively support the one-wire protocol. However, some people have had success emulating this using bit-banging on other TI microcontrollers. You should be able to port any of these solutions to the C2000 GPIOs.
e2e.ti.com/.../512250
e2e.ti.com/.../673246

Additionally the TM4C129XCZAD does have an integrated one-wire master module, you might be able to port the high level driver from there and implement the low level using the GPIOs on the F28M36x device.

Thanks,
Mark

0 chenkun chuang over 7 years ago in reply to Mark Labbato

Prodigy 210 points

Hi Mark,

thanks for the reply. I have further question.

1) This API, DELAY_US() delay micro sec, can this be used in M3 side?
2) Additionally the TM4C129XCZAD does have an integrated one-wire master module, you might be able to port the high level driver from there and implement the low level using the GPIOs on the F28M36x device. Can you point me to the location i can take a look at?

Thanks again for your help.

0 Mark Labbato over 7 years ago in reply to chenkun chuang

Guru 30330 points

1) I am not sure if there is a 100% equivalent, but there should be some delay functions -including a systick timer as in what might be used in an rtos. checkout the MWare\driverlib\systick.c/.h files
2) Please take a look at this thread: e2e.ti.com/.../307406 . The Appnote linked can be found here: http://www.ti.com/lit/spma057. If you have any specific questions on the one-wire implementation from that app note, please submit a new question to the appropriate forum: www.ti.com/.../support

Thanks,
Mark

0 chenkun chuang over 7 years ago in reply to Mark Labbato

Prodigy 210 points

HI Mark,

Thanks for your help. I will do more research on the info you provided.

C2000™︎ microcontrollers

C2000 microcontrollers forum

RTOS: Can TI platform handle one-wire protocol?