Posted on November 05, 2013 at 12:59Hello,
I
'm using stm32f
417vg chip and arm-none-eabi-gcc compiler
(and gd
b
)
.
I try to get adc
to read 14
an
alog
input
channels
.
Channels 1, 2
, 3
values are fine, b
ut
wh
en i
re
ad ch
annel
4
value
do
e
sn't change at all.
I use code below:
typedef struct {
GPIO_TypeDef* port;
uint32_t pin;
}gpioConfigs_t;
static gpioConfigs_t gpioConfig[] = {
{GPIOA,GPIO_Pin_1},
{GPIOA,GPIO_Pin_2},
{GPIOA,GPIO_Pin_3},
{GPIOA,GPIO_Pin_4},
{GPIOA,GPIO_Pin_5},
{GPIOA,GPIO_Pin_6},
{GPIOA,GPIO_Pin_7},
{GPIOB,GPIO_Pin_0},
{GPIOB,GPIO_Pin_1},
{GPIOC,GPIO_Pin_0},
{GPIOC,GPIO_Pin_1},
{GPIOC,GPIO_Pin_2},
{GPIOC,GPIO_Pin_3},
{GPIOC,GPIO_Pin_4}
};
void internalAdc_init2(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
ADC_InitTypeDef ADC_InitStructure;
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);
for(i = 0; i < INTERNAL_ADC_CHANNELS; i++){
GPIO_InitStructure.GPIO_Pin = gpioConfig[i].pin;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(gpioConfig[i].port, &GPIO_InitStructure);
}
ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC3 Init */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;
ADC_InitStructure.ADC_ScanConvMode = DISABLE;
ADC_InitStructure.ADC_ContinuousConvMode = DISABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC3, &ADC_InitStructure);
/* Enable ADC3 */
ADC_Cmd(ADC3, ENABLE);
}
uint16_t readAdc(uint8_t channel)
{
uint16_t res, val = 0;
ADC_RegularChannelConfig(ADC3, channel, 1, ADC_SampleTime_3Cycles);
ADC_SoftwareStartConv(ADC3);
while(ADC_GetFlagStatus(ADC3, ADC_FLAG_EOC) == RESET);
val = ADC_GetConversionValue(ADC3);
res = val >> 4;
return res;
}
from app ->
uint16_t test
Data;
testData = readAdc(1); /*
ok
*/
testData = readAdc(2); /* ok */
testData = readAdc(3);/*
ok *
/
testData = readAdc(4);/* This value
d
oes
not ch
an
ge
*/
