Posted on October 29, 2015 at 15:02What is wrong here?
I try to read 2 bytes data of temperature sensor LM73 by I2C of STM32F0Discovery based on STM32F051 micro. The micro is waiting RXNE event and doesn't exit from the loop.
I don't see any activity on SDA and SCL lines The signals have the pullup resistors.
Here is a code bellow:
void init_I2C1(void) {
I2C_InitTypeDef I2C1_InitStructure; // I2C1 Configuration structure
/** I2C1 GPIO Configuration
PB6 ------> I2C1_SCL
PB7 ------> I2C1_SDA
*/
/*Enable or disable the AHB peripheral clock */
RCC_I2CCLKConfig(RCC_I2C1CLK_HSI);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* IC1 Configuration */
// I2C_Cmd(I2C1,DISABLE);
/*Configure GPIO pin : PB */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7;
GPIO_InitStruct.GPIO_OType = GPIO_OType_OD;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_Init(GPIOB, &GPIO_InitStruct);
I2C1_InitStructure.I2C_Mode = I2C_Mode_I2C;
/*Timing register value is computed with the AN4235 xls file,
fast Mode @400kHz with I2CCLK = 48MHz, rise time = 140ns, fall time = 40ns */
I2C1_InitStructure.I2C_Timing = 0x00B01A4B;// 400KHz | 8MHz-0x00310309; 16MHz-0x10320309; 48MHz-50330309 I2C1_InitStructure.I2C_OwnAddress1 =0;
I2C1_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C1_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
I2C1_InitStructure.I2C_DigitalFilter = 0x00;
I2C1_InitStructure.I2C_OwnAddress1 = 0x00;
I2C1_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C1_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C1_InitStructure);
I2C_MasterRequestConfig(I2C1,I2C_Direction_Receiver); // Master reading mode
I2C1->CR1 |= I2C_IT_RXI; // Enable RXNE Event
// GPIO_SetBits(GPIOB,GPIO_Pin_8);// Power up
Delay(10);
I2C_Cmd(I2C1,ENABLE);
/*Read function*/
void I2C1MasterBufferRead() {
I2C_TransferHandling(I2C1,(LM73_BASE_ADDR),2,I2C_AutoEnd_Mode,I2C_Generate_Start_Read);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET);
ucI2CReadBuff[0] = I2C_ReceiveData(I2C1);
while(I2C_GetFlagStatus(I2C1, I2C_FLAG_RXNE) == RESET);
ucI2CReadBuff[1] = I2C_ReceiveData(I2C1);
while(I2C_GetFlagStatus(I2C1, I2C_ISR_STOPF) == SET);
I2C_ClearFlag(I2C1,I2C_FLAG_STOPF);
}
