Controlling a pin in MIOS32

[jmayes]

Hi, I am trying to convert my app from mios8 to mios32. In mios8 I used "PORTCbits.RC0 = 1" to turn a pin on, I can't seem to find an equivalent in mios32. I would like to use the J19 pins if possible. Also is there anything I will need to do to turn off any preexisting drivers or to configure the pins?

Thankx for any help someone can provide,

Jmayes

[ilmenator]

Not sure about J19, but there is a tutorial that shows how to do that for J5.

[jmayes]

Not sure about J19, but there is a tutorial that shows how to do that for J5.

Thank you ilmenator, I am looking at that now. Seems some pins have mios32 def's and some don't, I was hoping there was generic C defs could be used to toggle any pin like with the pic. Can someone put some more light on this?

Thankx again all,

Jmayes

[TK.]

There are generic IO configuration routines which are part of the low-level driver provided by STM.

It's already part of the repository, used by MIOS32 and available for all applications as well.

Here the source code if you are interested: http://svnmios.midibox.org/listing.php?repname=svn.mios32&path=%2Ftrunk%2Fdrivers%2FSTM32F10x%2Fv3.3.0%2FSTM32F10x_StdPeriph_Driver%2F

(but again: the sources are already compiled into the application, no special treatments required to integrate them)

Example to configure J19:RC1 (pin PC13) as push-pull output (0/3.3V):

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // weak driver to reduce transients

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

[/code]




Example to configure J19:RC1 (pin PC13) as open drain output (0/5V if pull-up resistor is used):

[code]

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_OD;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // weak driver to reduce transients

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

Example to configure J19:RC1 (pin PC13) as input with internal pull-up to 3.3V enabled:

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // doesn't really matter for inputs

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

[/code]




Example to configure J19:RC1 (pin PC13) as floating input (w/o pull device):

[code]

  GPIO_InitTypeDef GPIO_InitStructure;

  GPIO_StructInit(&GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_FLOATING;

  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; // doesn't really matter for inputs

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;

  GPIO_Init(GPIOC, &GPIO_InitStructure);

MIOS32 configures J19 pins for software based SPI, but as long as you don't use MIOS32_SPI_...(2...) (SPI port 2), the pins can be used for other purposes w/o danger. Toggling pins:

GPIOC->BSRR = GPIO_Pin_13;

[/code]


will set the pin to 1, and:

[code]

GPIOC->BRR = GPIO_Pin_13;

will set the pin to 0

Best Regards, Thorsten.

[jmayes]

There are generic IO configuration routines which are part of the low-level driver provided by STM.

..........

Best Regards, Thorsten.

Great! That was exactly what I needed.

Thankx again for a quick answer,

Jmayes

Edited May 2, 2011 by jmayes

[jmayes]

Hey TK,

While I got this working (with your help), I still don't understand exactly why all the config statements are needed (or how they work). Could you give a statement by statement explanation of how this works?

I know it would help me greatly and I am sure other nubies too.

Thankx again for all your help!

Jmayes

[TK.]

ST provides a very useful documentation for these functions:

STM32F10x reference manual: http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/REFERENCE_MANUAL/CD00171190.pdf

Chapter 9: General Purpose and alternative-function IOs

The functions and parameters are documented in the source code:

http://svnmios.midibox.org/filedetails.php?repname=svn.mios32&path=%2Ftrunk%2Fdrivers%2FSTM32F10x%2Fv3.3.0%2FSTM32F10x_StdPeriph_Driver%2Finc%2Fstm32f10x_gpio.h

http://svnmios.midibox.org/filedetails.php?repname=svn.mios32&path=%2Ftrunk%2Fdrivers%2FSTM32F10x%2Fv3.3.0%2FSTM32F10x_StdPeriph_Driver%2Fsrc%2Fstm32f10x_gpio.c

Best Regards, Thorsten.