Posted on May 17, 2011 at 13:35Hi
I have a problem with I2C(on I2C2).I have configured related parts, but I have not any output neither on data pin nor on clock pin whenever I send information via it.(oscilloscope does not show any activity,pins have external pull up resistors).
I am using Ride7(7.20.09.0162) as a compiler and STM32F101 as a processor.
The part of the program which is related to I2C configuration is as follow, and I will appreciate if anybody can help me to find my failure.
#define Global_I2C2_Speed 350000
#define sysclock High
//Reset and clock controll
void RCC_Configuration(void)
{
RCC_DeInit();//RCC system reset(for debug purpose)
RCC_HSEConfig(RCC_HSE_ON);//Enable HSE
HSEStartUpStatus = RCC_WaitForHSEStartUp();//Wait till HSE is ready
if(HSEStartUpStatus == SUCCESS)
{
RCC_PCLK2Config(RCC_HCLK_Div1);//APB2CLK = HCLK
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);//Enable Prefetch Buffer
#if(sysclock==High)
RCC_HCLKConfig(RCC_SYSCLK_Div1);//AHBCLK = SYSCLK-36Mhz
RCC_PCLK1Config(RCC_HCLK_Div2);//APB1CLK = AHBCLK/2-18Mhz
FLASH_SetLatency(FLASH_Latency_2);//Flash 2 wait state
RCC_PLLConfig(RCC_PLLSource_HSE_Div2,RCC_PLLMul_9);//PLLCLK = 8MHz/2 * 9 = 36 MHz
RCC_PLLCmd(ENABLE);//Enable PLL
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET)//Wait till PLL is ready
{
}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);//Select PLL as system clock source
while(RCC_GetSYSCLKSource() != 0x08)// Wait till PLL is used as system clock source
{
}
#elif(sysclock==Low)
RCC_HCLKConfig(RCC_SYSCLK_Div2);//AHBCLK = SYSCLK/2-8Mhz/2=4Mhz
RCC_PCLK1Config(RCC_HCLK_Div1);//APB1CLK =AHBCLK-4Mhz
FLASH_SetLatency(FLASH_Latency_0);//Flash 0 wait state
RCC_SYSCLKConfig(RCC_SYSCLKSource_HSE);
#endif
}
RCC_GetClocksFreq(&RCC_ClocksStatus);
HCLK_Freq=(RCC_ClocksStatus.HCLK_Frequency/800000);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2,ENABLE);//TIM2 clock enable
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD | RCC_APB2Periph_GPIOE |
RCC_APB2Periph_AFIO, ENABLE);//Enable GPIOA, GPIOB , GPIOD , GPIIOE and AFIO clocks
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE);//Enable GPIOD and AFIO clocks
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);//Enable I2C2 clock
}
void I2C_Configuration(void)
{
I2C_InitTypeDef I2C_InitStructure;
// I2C2 configuration
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = Global_I2C2_Own_ADDRESS;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = Global_I2C2_Speed;
I2C_Cmd(I2C2, ENABLE);//I2C Peripheral Enable
I2C_Init(I2C2, &I2C_InitStructure);//Apply I2C configuration after enabling it
}
void GPIO_Configuration(void)
{
// Configure I2C2 pins: SCL and SDA
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ; //SCL
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;//GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//GPIO_Mode_AF_OD
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; //SDA
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;//GPIO_Speed_2MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
}
