boards/nucleo-f446re: fix adc example

fix adc example for nucleo-f446re:

- the second ADC channel should be different from first channel
- enable ADC SCAN mode so we get convertion on CH0 and CH1
- disable software trigger from application, we use hardware triggering
from timer

Signed-off-by: raiden00pl <raiden00@railab.me>

boards/arm/stm32/nucleo-f446re/configs/adc/defconfig

@@ -10,7 +10,6 @@
 # CONFIG_NSH_CMDOPT_HEXDUMP is not set
 # CONFIG_NSH_DISABLE_IFCONFIG is not set
 # CONFIG_NSH_DISABLE_PS is not set
-# CONFIG_STM32_ADC1_SCAN is not set
 # CONFIG_STM32_FLASH_PREFETCH is not set
 CONFIG_ADC=y
 CONFIG_ANALOG=y
@@ -27,7 +26,6 @@ CONFIG_BOARD_LOOPSPERMSEC=8499
 CONFIG_BUILTIN=y
 CONFIG_EXAMPLES_ADC=y
 CONFIG_EXAMPLES_ADC_GROUPSIZE=2
-CONFIG_EXAMPLES_ADC_SWTRIG=y
 CONFIG_HAVE_CXX=y
 CONFIG_HAVE_CXXINITIALIZE=y
 CONFIG_INIT_ENTRYPOINT="nsh_main"
@@ -48,6 +46,7 @@ CONFIG_START_MONTH=10
 CONFIG_START_YEAR=2014
 CONFIG_STM32_ADC1=y
 CONFIG_STM32_ADC1_DMA=y
+CONFIG_STM32_ADC1_SAMPLE_FREQUENCY=1
 CONFIG_STM32_DMA2=y
 CONFIG_STM32_JTAG_SW_ENABLE=y
 CONFIG_STM32_TIM1=y

boards/arm/stm32/nucleo-f446re/src/stm32_adc.c

@@ -71,7 +71,7 @@ static const uint8_t  g_adc1_chanlist[ADC1_NCHANNELS] =
 static const uint32_t g_adc1_pinlist[ADC1_NCHANNELS]  =
 {
   GPIO_ADC1_IN0,
-  GPIO_ADC1_IN0
+  GPIO_ADC1_IN1
 };
 
 #else