AN3427 datasheet(48/52 Pages) STMICROELECTRONICS

48 / 52 page

Firmware migration using the library

AN3427

48/52

Doc ID 019001 Rev 1

/* Start ADC1 calibration */

ADC_StartCalibration(ADC1);

/* Check the end of ADC1 calibration */

while(ADC_GetCalibrationStatus(ADC1));

/* Start ADC1 Software Conversion */

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

...

In F2 series you have to update this code as follows:

...

/* Enable ADC's APB interface clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* Common configuration (applicable for the three ADCs) *********************/

/* Single ADC mode */

ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;

/* ADCCLK = PCLK2/2 */

ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;

/* Available only for multi ADC mode */

ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;

/* Delay between 2 sampling phases */

ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;

ADC_CommonInit(&ADC_CommonInitStructure);

/* Configure ADC1 to convert continously channel14 **************************/

ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;

ADC_InitStructure.ADC_ScanConvMode = DISABLE;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfConversion = 1;

ADC_Init(ADC1, &ADC_InitStructure);

/* ADC1 regular channel14 configuration */

ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_3Cycles);

/* Enable DMA request after last transfer (Single-ADC mode) */

ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);

/* Enable ADC1's DMA interface */

ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 */

ADC_Cmd(ADC1, ENABLE);

/* Start ADC1 Software Conversion */

ADC_SoftwareStartConv(ADC1);

...

The main changes in the source code/procedure in F2 series vs. F1 are described below:

ADC configuration is done by two functions: ADC_CommonInit() and ADC_Init(). The

ADC_CommonInit() function is used to configure parameters common to the three

ADCs, including the ADC analog clock prescaler.

To enable the generation of DMA requests continuously at the end of the last DMA

transfer, the ADC_DMARequestAfterLastTransferCmd() function should be used.

No calibration is needed.

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