Hello everbody!
I work with an STM32L and in eed to communicate with EEPROM in I2C(M24C64 or m24lr64, the result are the same).
But i've some problem to have good result with:
my code:
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
/* Enable I2C clock */
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);
/* Enable GPIOA clock */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
/* Configure PB.10 & PB.11 in alternate function -------------------------*/
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10|GPIO_Pin_11;
GPIO_Init(GPIOB, &GPIO_InitStructure);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource10,GPIO_AF_I2C2) ;
GPIO_PinAFConfig(GPIOB, GPIO_PinSource11,GPIO_AF_I2C2) ;
/* Enable I2C2 -------------------------------------------------------------*/
I2C_DeInit(I2C2);
I2C_Cmd(I2C2, ENABLE);
/* Init I2C */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
I2C_InitStructure.I2C_OwnAddress1 = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_ClockSpeed = 400000; //IS_I2C_CLOCK_SPEED(400000)
I2C_InitStructure.I2C_AcknowledgedAddress=0xA0;
I2C_Init(I2C2,&I2C_InitStructure);
// I2C_GenerateSTART(I2C2, ENABLE);
//Delay(1);
I2C_AcknowledgeConfig(I2C2, ENABLE);
while(I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY));
I2C_GenerateSTART(I2C2, ENABLE);
while(!I2C_GetFlagStatus(I2C2, I2C_FLAG_SB));
while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT));
I2C_Send7bitAddress(I2C2,0xA0,I2C_Direction_Transmitter); Delay(17);
// while(!I2C_CheckEvent(I2C2,I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
/* adresse */
I2C_SendData(I2C2,0x07);Delay(17);// Send Year register address
I2C_SendData(I2C2,0x40);Delay(17);
// while(!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTING));
I2C_GenerateSTOP(I2C2, ENABLE);
//Delay(20);
Some while are in comment because if i se it the programm block in this while.
and i joined a result in oscilloscope:
The ack are little bit strange and i don't know why.
So if you see error in my code tell me.
Thank you
