Posted on November 05, 2013 at 16:51Hello everybody,
I have an application for the STM32f051 wich has a i2c device connected
I have configured and initialized the i2c, however when I send some data both SDA and SDI lines are staying 'high', I don't see any pulses on any of the lines.
I have configured the bus like this:
/* Connect PXx to I2C_SCL */
GPIO_PinAFConfig(GPIOB, GPIO_Pin_6, GPIO_AF_1);
/* Connect PXx to I2C_SDA */
GPIO_PinAFConfig(GPIOB, GPIO_Pin_7, GPIO_AF_1);
/*!< Configure I2C pins: SCL */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStructure);
/*!< Configure I2C pins: SDA */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I have initialized my clocks like this:
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA |
RCC_AHBPeriph_GPIOB |
RCC_AHBPeriph_GPIOC |
RCC_AHBPeriph_GPIOF , ENABLE);
RCC_APB1PeriphClockCmd( RCC_APB1Periph_TIM2 | /* for 1ms timer */
RCC_APB1Periph_TIM3 |
RCC_APB1Periph_USART2 |
RCC_APB1Periph_I2C1 , ENABLE); /* for event timer */
/* Configure the I2C clock source. The clock is derived from the HSI */
RCC_I2CCLKConfig(RCC_I2C1CLK_HSI);
I have initialized the i2c bus like this:
/* I2C configuration */
I2C_InitTypeDef I2C_InitStructure;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
//I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = 0x00;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Timing = 0x1045061D; //I2C_TIMING;
/* Apply I2C configuration after enabling it */
I2C_Init(I2C1, &I2C_InitStructure);
/* I2C Peripheral Enable */
I2C_Cmd(I2C1, ENABLE);
Can anyone say what i'am doing wrong?
Thanks in advance,
Evert
#stm32f051-i2c-init
