GPIO Analog

[Luiz Guilherme]

Posted on May 09, 2017 at 14:39

How use the analog port with the stm32l0538 disco using the hal library

#analog

[RomainR.]

Posted on May 09, 2017 at 16:20

Hello Luiz

Do you mean how to use the ADC peripheral or does your question concern the configuration of GPIOs in analog mode ?

Have you looked at the ADC examples for the STM32L053C8-Discovery board in your STM32Cube directory?

[Luiz Guilherme]

Posted on May 09, 2017 at 19:00

Hi Romain 

My question is the comfiguration of GPIO in analog mode, and i not found examples for this

you can help me ?

[Tesla DeLorean]

Posted on May 09, 2017 at 19:23

STM32Cube_FW_L0_V1.8.0\Projects\STM32L053C8-Discovery\Examples\ADC\ADC_DMA_Transfer\Src\main.c

STM32Cube_FW_L0_V1.8.0\Projects\STM32L053R8-Nucleo\Examples\ADC\ADC_RegularConversion_Interrupt\Src\main.c

Bunch of examples, for DISCO and NUCLEO boards, review them

[Luiz Guilherme]

Posted on May 09, 2017 at 19:45

Ok i saw the examples, but i not found the analog output example

[Tesla DeLorean]

Posted on May 09, 2017 at 20:31

Your question wasn't that specific, look at the DAC examples then

STM32Cube_FW_L0_V1.8.0\Projects\STM32L053C8-Discovery\Examples\DAC\DAC_SimpleConversion\Src\main.c

[Luiz Guilherme]

Posted on May 09, 2017 at 21:20

i know the dac, but i want control a RGB led in different values established from the software 

ex.

Led Red 127

Led Green 55

Led Blue 255

And the stm32l0538 Disco has only one channel DAC

understood ?

[Tesla DeLorean]

Posted on May 09, 2017 at 23:56

May be it is poor choice of part for your application? Also the DAC doesn't drive the amount current you'd need for an LED.

Could you use a timer in PWM mode? Many of the TIM have 4 channels which can share a common period, with different pulse widths.

[RomainR.]

Posted on May 10, 2017 at 10:30

Hi Luiz

The DAC is not suitable for this type of application.

I advise you to use 3 channels of a GP TIMER in PWM output mode with the HAL Library (as Clive One explains there are a multitude of examples)

Alternatively you can watch and try the MBed class below. Your STM32L053-Discovery is compatible with MBed Online.

https://developer.mbed.org/users/4180_1/notebook/rgb-leds/

 

Best regards

[Luiz Guilherme]

Posted on May 10, 2017 at 14:41

Really i had forgotten the PWM Thanks