what is Keil builtin Function/command to set the Prescaler for stm32f103 ?

ADC clock configuration is separate from other ADC configuration for F103.

The SPL had this function:

/**

 * @brief Configures the ADC clock (ADCCLK).

 * @param RCC_PCLK2: defines the ADC clock divider. This clock is derived from

 *  the APB2 clock (PCLK2).

 *  This parameter can be one of the following values:

 *    @arg RCC_PCLK2_Div2: ADC clock = PCLK2/2

 *    @arg RCC_PCLK2_Div4: ADC clock = PCLK2/4

 *    @arg RCC_PCLK2_Div6: ADC clock = PCLK2/6

 *    @arg RCC_PCLK2_Div8: ADC clock = PCLK2/8

 * @retval None

 */

void RCC_ADCCLKConfig(uint32_t RCC_PCLK2)

{

 uint32_t tmpreg = 0;

 /* Check the parameters */

 assert_param(IS_RCC_ADCCLK(RCC_PCLK2));

 tmpreg = RCC->CFGR;

 /* Clear ADCPRE[1:0] bits */

 tmpreg &= CFGR_ADCPRE_Reset_Mask;

 /* Set ADCPRE[1:0] bits according to RCC_PCLK2 value */

 tmpreg |= RCC_PCLK2;

 /* Store the new value */

 RCC->CFGR = tmpreg;

}

thanks for your reply,

i write you code below, the last 2 lines give me error, the commands that you told me RCC_PCLK2_Div2: ADC clock = PCLK2/2 is not working in this way.... the way i am writing the code,

i hope you can understand

#include <stdio.h>

#include "stm32f10x.h"         // Device header

#include "GPIO_STM32F10x.h"       // Keil::Device:GPIO

#include "stm32f10x_adc.h"       // Keil::Device:StdPeriph Drivers:ADC

#include "stm32f10x_rcc.h"       // Keil::Device:StdPeriph Drivers:RCC

#include "stm32f10x_gpio.h"       // Keil::Device:StdPeriph Drivers:GPIO

void ADC_Configuration(void);

GPIO_InitTypeDef    GPIO_InitStructure; 

ADC_InitTypeDef     ADC_InitStructure; 

int main () {          

unsigned int j;

//----------------------------------------------------------------------------------------

// Software triggered, dual, simultaneous sampling                    

//----------------------------------------------------------------------------------------

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC2, ENABLE); //Enabling ADC1 and ADC2 clock

 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB, ENABLE); //Enabling GPIOA and GPIOB Clock

 GPIO_InitStructure.GPIO_Pin  = GPIO_Pin_1 | GPIO_Pin_2; //Analog voltages to be measured are connected to pins 1 and 2 of port A, 

 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //Analog input mode for ADC

 GPIO_Init(GPIOA, &GPIO_InitStructure); // calls the function to actually configure the port A.

 //ADC_CommonInitStructure.ADC_DMAAccessMode  = ADC_DMAAccessMode_Disabled;

 //ADC_CommonInitStructure.ADC_Mode       = ADC_DualMode_RegSimult;

ADC_InitStructure.ADC_Mode=ADC_CR1_SCAN;

RCC_PCLK2_Div2:ADCclock = PCLK2/2; // ----->>> do not accept colon

RCC_PCLK2_Div2 = RCC_CFGR_ADCPRE_DIV2;

You could just use the function, for example:

RCC_ADCCLKConfig(RCC_PCLK2_Div2); // set ADC clock to PCLK2 / 2

I'm not familiar with "Pro*C Embedded SQL", my project is just using embedded C and the ST standard peripheral library, which it appears you are also using.