AN3422 datasheet(47/52 Pages) STMICROELECTRONICS

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AN3422

Firmware migration using the library

Doc ID 018976 Rev 2

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EXTI_InitStructure.EXTI_Line = EXTI_Line0;

EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;

EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;

EXTI_InitStructure.EXTI_LineCmd = ENABLE;

EXTI_Init(&EXTI_InitStructure);

5.6

ADC

This section gives an example of how to port existing code from STM32F1 series to

STM32L1 series.

The example below shows how to configure the ADC1 to convert continuously channel14 in

STM32F1 series:

...

/* ADCCLK = PCLK2/4 */

RCC_ADCCLKConfig(RCC_PCLK2_Div4);

/* Enable ADC's APB interface clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);

/* Configure ADC1 to convert continously channel14 */

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ScanConvMode = ENABLE;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC1, &ADC_InitStructure);

/* ADC1 regular channel14 configuration */

ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_55Cycles5);

/* Enable ADC1's DMA interface */

ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 */

ADC_Cmd(ADC1, ENABLE);

/* Enable ADC1 reset calibration register */

ADC_ResetCalibration(ADC1);

/* Check the end of ADC1 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC1));

/* 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 L1 series you have to update this code as follows:

...

/* Enable the HSI oscillator */

RCC_HSICmd(ENABLE);

/* Check that HSI oscillator is ready */

while(RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET)

{

}

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