I2C

[bozorgzad]

Posted on December 28, 2009 at 12:32

I2C

[tomas23]

Posted on May 17, 2011 at 13:35

You don't start any transaction, so when do you expect the communication? No start, no address, no data...

Try to use the I2C examples from FW library example directory as a base for your development.

Btw. enabling GPIOA and AFIO twice has no use.

[bozorgzad]

Posted on May 17, 2011 at 13:35

Hi

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);

}

[bozorgzad]

Posted on May 17, 2011 at 13:35

Thanks for your reply.I didnt write transaction part in forum, but in my program it exist.