Need help for continues Scan ADC of STM32F0

[toantq3]

Posted on October 08, 2012 at 04:23

Dear friends,

I implement continuous scan ADC1 with 8 channels 0,1,4,5,6,7,8,9 I post my code below. There is something, I don't understand that. If I configure: ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; /*Scan from channel 0 to 18*/The sequence data outputs of array RegularConvData_Tab[8]:RegularConvData_Tab[0] of channel 9RegularConvData_Tab[1] of channel 0RegularConvData_Tab[2] of channel 1RegularConvData_Tab[3] of channel 4RegularConvData_Tab[4] of channel 5RegularConvData_Tab[5] of channel 6RegularConvData_Tab[6] of channel 7RegularConvData_Tab[7] of channel 8Anybody can help me why output data is not sequential from channel 0-9 for data from 0 to 7.My code below.__IO u16 RegularConvData_Tab[ADC1_NUMOFCHANNEL];/***************************************************************************************************************************************   LOCAL FUNCTIONS/PROCEDURES ***************************************************************************************************************************************/void ADC1_Init_GPIOs(void){ GPIO_InitTypeDef    GPIO_InitStructure; /* GPIOA Periph clock enable */ RCC_AHBPeriphClockCmd(ADC1_GPIO_PORT1_CLK, ENABLE); /* Configure ADC Channel0,1,4,5,6,7 as analog input */ GPIO_InitStructure.GPIO_Pin = ADC1_C1_OUTPUT|ADC1_C1_SENSE|ADC1_C2_OUTPUT|ADC1_C2_SENSE|ADC1_C3_OUTPUT|ADC1_C3_SENSE; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(ADC1_GPIO_PORT1, &GPIO_InitStructure); /* GPIOB Periph clock enable */ RCC_AHBPeriphClockCmd(ADC1_GPIO_PORT2_CLK, ENABLE); /* Configure ADC Channe8,9 as analog input */ GPIO_InitStructure.GPIO_Pin = ADC1_C4_OUTPUT|ADC1_C4_SENSE; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ; GPIO_Init(ADC1_GPIO_PORT2, &GPIO_InitStructure);}void ADC1_Init_DMA(void){ DMA_InitTypeDef   DMA_InitStructure; /* DMA1 clock enable */ RCC_AHBPeriphClockCmd(ADC1_DMA_CLK , ENABLE); /* DMA1 Channel1 Config */ DMA_DeInit(ADC1_DMA_CHANNEL); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RegularConvData_Tab; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = ADC1_NUMOFCHANNEL; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(ADC1_DMA_CHANNEL, &DMA_InitStructure); /* DMA1 Channel1 enable */ DMA_Cmd(ADC1_DMA_CHANNEL, ENABLE); /* ADC DMA request in circular mode */ ADC_DMARequestModeConfig(ADC1_SCALE, ADC_DMAMode_Circular); /* Enable ADC_DMA */ ADC_DMACmd(ADC1_SCALE, ENABLE);}void ADC1_Init(void){ ADC_InitTypeDef     ADC_InitStructure; /* Initialize ADC structure */ ADC_StructInit(&ADC_InitStructure); /* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits  */ ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;  ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; /*[15:12] = 0x00 ; [11:0] = data*/ ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward; /*Scan from channel 0 to 18*/ // ADC_ScanDirection_Backward ADC_Init(ADC1_SCALE, &ADC_InitStructure);  /* Convert the ADC1 Channel 0,1,4,5,6,7 with  239 Cycles as sampling time */  ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_0 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_1 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_4 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_5 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_6 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_7 , ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 8,9 with  239 Cycles as sampling time */  ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_8 , ADC_SampleTime_239_5Cycles); ADC_ChannelConfig(ADC1_SCALE, ADC_Channel_9 , ADC_SampleTime_239_5Cycles); /* ADC Calibration */ ADC_GetCalibrationFactor(ADC1_SCALE); /* Enable ADC1 */ ADC_Cmd(ADC1_SCALE, ENABLE);    /* Wait the ADCEN falg */ while(!ADC_GetFlagStatus(ADC1_SCALE, ADC_FLAG_ADEN));  /* ADC1 regular Software Start Conv */  ADC_StartOfConversion(ADC1_SCALE);}void ADC_Scale_Init(void){ /* ADC1 DeInit */   ADC_DeInit(ADC1_SCALE); /* ADC1 Periph clock enable */ RCC_APB2PeriphClockCmd(ADC1_CLK, ENABLE); ADC1_Init_GPIOs(); ADC1_Init_DMA(); ADC1_Init(); /* Test DMA1 TC flag */    while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET );         /* Clear DMA TC flag */    DMA_ClearFlag(DMA1_FLAG_TC1);}void main(void){ /*ADC*/ ADC_Scale_Init(); while(1){

/* Test DMA1 TC flag */

while((DMA_GetFlagStatus(DMA1_FLAG_TC1)) == RESET );  /* Clear DMA TC flag */ DMA_ClearFlag(DMA1_FLAG_TC1); for (cnt = 0; cnt<8; cnt++){ x16_to_str(RegularConvData_Tab[cnt], data_dip); uart_tx_puts(DEBUG_USART1, uart_tx_get_buf_ptr(DEBUG_USART1), data_dip, 2); }}}