AN3427 datasheet(40/52 Pages) STMICROELECTRONICS

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Firmware migration using the library

AN3427

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Doc ID 019001 Rev 1

than or equal to 48 MHz to work correctly. The following is an example of the main

PLL configuration to obtain 120 MHz as system clock frequency and 48 MHz for

the OTG FS and SDIO.

/* PLL_VCO = (HSE_VALUE / PLL_M) * PLL_N = 240 MHz */

#define PLL_M

#define PLL_N

240

/* SYSCLK = PLL_VCO / PLL_P = 120 MHz */

#define PLL_P

/* USB OTG FS, SDIO and RNG Clock =

PLL_VCO / PLLQ = 48 MHz */

#define PLL_Q

...

/* Configure the main PLL */

RCC_PLLConfig(RCC_PLLSource_HSE, PLL_M, PLL_N, PLL_P, PLL_Q, 0);

/* Wait till PLL is ready */

while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == 0)

{

}

...

/* Enable USB OTG FS's AHB interface clock */

RCC_AHB2PeriphClockCmd(RCC_AHB2Periph_OTG_FS, ENABLE);

/* Enable SDIO's APB interface clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SDIO, ENABLE);

ADC: in STM32 F2 series the ADC features two clock schemes:

–

Clock for the analog circuitry: ADCCLK, common to all ADCs. This clock is

generated from the APB2 clock divided by a programmable prescaler that allows

the ADC to work at fPCLK2/2, /4, /6 or /8. The maximum value of ADCCLK is 30

MHz when the APB2 clock is at 60 MHz. This configuration is done using the ADC

registers.

–

Clock for the digital interface (used for register read/write access). This clock is

equal to the APB2 clock. The digital interface clock can be enabled/disabled

individually for each ADC through the RCC APB2 peripheral clock enable register

(RCC_APB2ENR). However, there is only a single bit to reset the three ADCs at

the same time.

/* Enable APB interface clock for ADC1, ADC2 and ADC3 */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2 |

RCC_APB2Periph_ADC3, ENABLE);

/* Reset ADC1, ADC2 and ADC3 */

RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC, ENABLE);

RCC_APB2PeriphResetCmd(RCC_APB2Periph_ADC, DISABLE);

4.3

FLASH

The table below presents the correspondence between the FLASH driver APIs in the

STM32F10x and STM32F2xx Libraries. You can easily update your application code by

replacing STM32F10x functions by the corresponding function in STM32F2xx Library.

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