Hi, there seems to be a bug in the ADC setup logic and adc_reset() is only called when the ADC driver is first opened. You can fix it with the patch below, but I need to verify if it doesn't break the ADC for STM32F3. If it works, I prepare a PR
diff --git a/arch/arm/src/stm32/stm32_adc.c b/arch/arm/src/stm32/stm32_adc.c > index b9f615fc7d..4dffd6637b 100644 > --- a/arch/arm/src/stm32/stm32_adc.c > +++ b/arch/arm/src/stm32/stm32_adc.c > @@ -2886,8 +2886,6 @@ static int adc_setup(FAR struct adc_dev_s *dev) > return OK; > } > > - priv->initialized += 1; > - > /* Attach the ADC interrupt */ > > #ifndef CONFIG_STM32_ADC_NOIRQ > @@ -2960,6 +2958,10 @@ static int adc_setup(FAR struct adc_dev_s *dev) > adccmn_lock(priv, false); > #endif > > + /* The ADC device is ready */ > + > + priv->initialized += 1; > + > return ret; > } > czw., 6 sie 2020 o 13:32 Alan Carvalho de Assis <acas...@gmail.com> napisał(a): > Hi Nii, > > What board are you using? It appears like an incorrect ADC board > configuration. > > The analog value for channels 4 and 5 are changing a little bit from > each sampling, but they appear to make sense. > > Try to isolate the issue, you can start with a single channel, start > without DMA, etc. > > Also enabling the DEBUG ADC could give you some hints. > > BR, > > Alan > > On 8/6/20, Nii Jyeni <niijy...@hotmail.com> wrote: > > I found a strange problem when using the latest source code to test the > ADC > > example. The analog value can be obtained when the ADC example is run for > > the first time. When the ADC example is run again, it is blocked and it > > looks like it is dead. But send Ctrl+C to the console can terminate it. > > > > OS:MacOS > > Nuttx:nightly > > MCU:stm32f429iit6 > > Board:customize > > > > NuttShell (NSH) NuttX-9.1.0 > > nsh> adc -n 2 > > adc_main: g_adcstate.count: 2 > > adc_main: Hardware initialized. Opening the ADC device: /dev/adc0 > > Sample: > > 1: channel: 4 value: 3091 > > 2: channel: 5 value: 3782 > > Sample: > > 1: channel: 4 value: 3192 > > 2: channel: 5 value: 3612 > > nsh> adc -n 2 > > adc_main: g_adcstate.count: 2 > > adc_main: Hardware initialized. Opening the ADC device: /dev/adc0 <— > > terminated by send ctrl + c > > nsh> adc -n 2 > > adc_main: g_adcstate.count: 2 > > adc_main: Hardware initialized. Opening the ADC device: /dev/adc0 <— > > terminated by send ctrl + c > > nsh> > > > > This is the configuration information about ADC that I am using: > > CONFIG_STM32_ADC1=y > > CONFIG_STM32_ADC1_DMA=y > > CONFIG_STM32_TIM1=y > > CONFIG_STM32_TIM1_ADC=y > > CONFIG_EXAMPLES_ADC=y > > CONFIG_EXAMPLES_ADC_GROUPSIZE=3 > > CONFIG_ADC=y > > > > Does anyone know what is going on? and how to solve this problem. >
