You are mostly right, you only need /dev/i2cX if you want to run the
i2ctool.
But some drivers could create its /dev/xyz even when the device is not
present, because some those drivers don't have a kind of probe() function
to get a confirmation from the driver.
When the extern I2C or SPI device
Hi Alan,
Thank you for the information!
---
My understanding for now is below. (For nucleo-F767 board)
- An initialization file is lying in
nuttx/boards/arm/stm32f7/nucleo-144/src/stm32_appinitialize.c. (Contents
in this file is executed when launching NuttX.)
- Initialization code for
Hi Yuta,
stm32_mpu9250initialize("/dev/mpu0");
This function receive the name of the device file it will creste. The
/dev/i2cX is created by the funcion i2c_register().
BR,
Alan
On Saturday, May 1, 2021, yuta wrote:
> Gregory,
>
> Thank you for your answer.
> I think I'm asking very easy
Gregory,
Thank you for your answer.
I think I'm asking very easy question since I'm very new to NuttX.
I'm not still sure how I can enable an I2C device.
I understood that there are lower-half driver and upper-half driver and
they should be associated each other with initialization code.
Abdelatif,
Thank you for your advice.
I enabled I2C tool in menuconfig.
Then I added some lines to initialize I2C in stm32_appinitialize.c
refering to the link you shared.
https://github.com/apache/incubator-nuttx/blob/master/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c#L89-L111
On 4/30/2021 6:34 AM, yuta wrote:
Hi all,
I'm trying to use I2C.
I configured below in menuconfig.
- System Type > STM32 Peripheral Support > [*] I2C1
- Device Drivers > [*] I2C Driver Support
then compilation was done successfully.
But no I2C device( like /dev/i2c1 ) showed up when I tried ls
Hi Alan,
Thank you for the link. I watched it!
Sorry I forgot to say that I've configured ` I2C Character driver
support ` as well.
However, /dev/i2c1 (or something like this) did not show up.
I'm going to try to register i2c driver.
Yuta Ide
On 2021/04/30 21:47, Alan Carvalho de Assis
If you want to use the I2C tool, you'll also have to register the i2c
driver from your board logic.
See:
https://github.com/apache/incubator-nuttx/blob/master/boards/arm/stm32f0l0g0/nucleo-g070rb/src/stm32_bringup.c#L89-L111
Hi Yuta,
Yes, you forgot to select the I2C Character driver support.
Please try to follow this tutorial:
https://www.youtube.com/watch?v=RzrDa4Sm1rU
BR,
Alan
On 4/30/21, yuta wrote:
> Hi all,
> I'm trying to use I2C.
> I configured below in menuconfig.
> - System Type > STM32 Peripheral
Hi all,
I'm trying to use I2C.
I configured below in menuconfig.
- System Type > STM32 Peripheral Support > [*] I2C1
- Device Drivers > [*] I2C Driver Support
then compilation was done successfully.
But no I2C device( like /dev/i2c1 ) showed up when I tried ls /dev
Do I forget something to do?
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