2013-10-24 04:38 AM
Hello,
I'm using the STM32F373 microcontroller and wrote a simple function to read data from a MPU6050 gyro/accel on bus i2c.Problem is that when i try to read data - flag I2C_ISR_TXIS always equal RESET (not set).Why this might happen?Thanks2013-10-24 04:43 AM
Here is source code with the problem.
void i2c1_init(void){ GPIO_InitTypeDef GPIO_InitStructure; I2C_InitTypeDef I2C_InitStructure; RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK); RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE); RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE); GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_4); GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_4); GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_OD; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6; GPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7; GPIO_Init(GPIOB, &GPIO_InitStructure); I2C_DeInit(I2C1); I2C_InitStructure.I2C_Mode = I2C_Mode_I2C; I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable; I2C_InitStructure.I2C_DigitalFilter = 0x00; I2C_InitStructure.I2C_OwnAddress1 = 0x33; I2C_InitStructure.I2C_Ack = I2C_Ack_Enable; I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; I2C_InitStructure.I2C_Timing = 0xC062121F; I2C_Init(I2C1, &I2C_InitStructure); I2C_Cmd(I2C1, ENABLE);}uint8_t i2c_read(I2C_TypeDef* I2Cx, uint8_t DeviceAddr, uint8_t RegAddr, uint8_t* pBuffer, uint16_t len){ /* Test on BUSY Flag */ uint32_t timeout = I2C_TIMEOUT; while(I2C_GetFlagStatus(I2Cx, I2C_ISR_BUSY) != RESET) { if((timeout--) == 0) return 0; } I2C_TransferHandling(I2Cx, DeviceAddr, 1, I2C_SoftEnd_Mode, I2C_Generate_Start_Write); /* !!! Wait until TXIS flag is set !!! */ timeout = I2C_TIMEOUT; while(I2C_GetFlagStatus(I2Cx, I2C_ISR_TXIS) == RESET) // PROBLEM HERE!!!!!!!!!!!!!!! { if((timeout--) == 0) return 0; } .... ....}