Posted by stmajith on 2018-04-26 08:08

hi,
i was trying to port code from stm32f4 to stm32f1.
the code is used for obtaining gyroscope values from GY521(mPU6050) through i2c by dma.
and iam stuck with ERROR: last event is different from I2C_EVENT.
below is my 12c mpu setup function.

setup_i2c_for_mpu6050()
{
GPIO_InitTypeDef GPIO_InitStruct;
I2C_InitTypeDef I2C_InitStruct;
NVIC_InitTypeDef NVIC_InitStructure;
DMA_InitTypeDef DMA_InitStructure;

/* Use I2C1, with SCL on PB8 and SDA on PB7. */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
/* Reset the I2C unit. */

/* Enable DMA clock for I2C. */

RCC_APB1PeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
/* Configure I2C_EE pins: SCL and SDA */
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_Init(GPIOB, &GPIO_InitStruct);

/* Initialise DMA. */
DMA_ClearFlag(DMA1_FLAG_TC1|DMA1_FLAG_TE1|DMA1_FLAG_HT1);
DMA_DeInit(DMA1_Channel1);
//DMA_Cmd(DMA1_Channel1, DISABLE);
// DMA_DeInit(DMA1_Channel1);
/* Address of data register. */
DMA_InitStructure.DMA_PeripheralBaseAddr = I2C1_BASE + I2C_Register_DR;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)mpu6050_reg_buffer;
DMA_InitStructure.DMA_BufferSize = 14;
DMA_DeInit(DMA1_Channel1);
DMA_Init(DMA1_Channel1, &DMA_InitStructure);
DMA_Cmd(DMA1_Channel1 , ENABLE ) ;

I2C_InitStruct.I2C_ClockSpeed = 100000;
I2C_InitStruct.I2C_Mode = I2C_Mode_I2C;
I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStruct.I2C_OwnAddress1 = 0x00;
I2C_InitStruct.I2C_Ack = I2C_Ack_Disable;
I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStruct);
I2C_ITConfig(I2C1, I2C_IT_BUF|I2C_IT_EVT|I2C_IT_ERR, DISABLE);

/* Configure the I2C interrupts. */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_4);
NVIC_InitStructure.NVIC_IRQChannel = I2C1_EV_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 10;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = I2C1_ER_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 10;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, DISABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 10;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_ITConfig(DMA1_Channel1, DMA_IT_TC, ENABLE);

I2C_Cmd(I2C1, ENABLE);
}

when iam calling this below function it gets stucked

while (!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));

I2C_CheckEvent function is given below--

ErrorStatus I2C_CheckEvent(I2C_TypeDef* I2Cx, uint32_t I2C_EVENT)
{
uint32_t lastevent = 0;
uint32_t flag1 = 0, flag2 = 0;
ErrorStatus status = ERROR;

/* Check the parameters */
assert_param(IS_I2C_ALL_PERIPH(I2Cx));
assert_param(IS_I2C_EVENT(I2C_EVENT));
/* Read the I2Cx status register */
flag1 = I2Cx->SR1;
flag2 = I2Cx->SR2;
flag2 = flag2
/* Get the last event value from I2C status register */
lastevent = (flag1 | flag2) & FLAG_Mask;

/* Check whether the last event contains the I2C_EVENT */
if ((lastevent & I2C_EVENT) == I2C_EVENT)
{
/* SUCCESS: last event is equal to I2C_EVENT */
status = SUCCESS;
}
else
{
/* ERROR: last event is different from I2C_EVENT */
status = ERROR;
}
/* Return status */
return status;
}

anyone has same issues?