Posted on March 12, 2008 at 11:49I use 6 channel in scan mode and I setup them in this way (MCLK is 36 MHz)
Code:
static void initAd(void)
{
GPIO_InitTypeDef GPIOx_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
/*-----------------------------------GPIO3 ----------------------------------*/
/* GPIO3 Clock Enable */
CFG_PeripheralClockConfig(CFG_CLK_GPIO3, ENABLE);
/* GPIO3 Configuration */
GPIOx_InitStructure.GPIO_Mode = GPIO_Mode_HI_AIN_TRI;
GPIOx_InitStructure.GPIO_Pins = GPIO_PIN_4 | // AIN0
GPIO_PIN_5 | // AIN1
GPIO_PIN_6 | // AIN2
GPIO_PIN_7 | // AIN3
GPIO_PIN_8 | // AIN4
GPIO_PIN_9; // AIN5
GPIO_Init (GPIO3, &GPIOx_InitStructure);
/*---------------------------------ADC---------------------------------------*/
/* ADC Clock Enable */
CFG_PeripheralClockConfig(CFG_CLK_ADC, ENABLE);
/* ADC Configuration */
ADC_StructInit(&ADC_InitStructure);
ADC_InitStructure.ADC_Calibration = ADC_Calibration_OFF;
ADC_InitStructure.ADC_AutoClockOff = ADC_AutoClockOff_Disable ;
ADC_InitStructure.ADC_ConversionMode = ADC_ConversionMode_Scan ;
ADC_InitStructure.ADC_SamplingPrescaler = 0x7; // Inutile ma 36/14=2.571 MHz
ADC_InitStructure.ADC_ConversionPrescaler = 0x7; // 36/14 = 2.571 MHz
// sampling time 11.33 us (1 ch); 70 us (6 ch)
ADC_InitStructure.ADC_FirstChannel = ADC_CHANNEL0 ;
ADC_InitStructure.ADC_ChannelNumber = 6;
ADC_Init(&ADC_InitStructure);
/* EOC interrupt Enable */
EIC_IRQChannelConfig( ADC_IRQChannel , ENABLE );
EIC_IRQChannelPriorityConfig( ADC_IRQChannel, 1);
ADC_ITConfig(ADC_IT_ECH , ENABLE);
/* Enable ADC */
ADC_Cmd(ENABLE);
}
The interrupt handler is something like this
Code:
void ADC_IRQHandler(void);
void ADC_IRQHandler(void)
{
if(ADC->PBR == 0)
{
while(1) GPIO0->PD ^= 16; // output a signal
}
/* Clear ECH Interrupt pending bit */
ADC_FlagClear (ADC->PBR);
// some stuff
}
with my oscilloscope I can see that after a while the program loops in while(1). It seems that is raised an interrupt without any panding bit set.
Is it possible?
Is the adc well configured?
What is wrong with code I wrote?
thanks
