Posted on January 05, 2016 at 09:18Hello!!
I test an access to eeprom by I2C Fastmode(polling) like following programs.
But when writing a block to eeprom, it happens an I2C error.
So I insert a delay time(1ms : _delay_ms(I2C_DLY)), and then it operates properly.
I want to delete this delay time to get the best performance of I2C.
How can I do it????
void I2C_LowLevel_Init(void){
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
/* RCC Configuration */
/*I2C Peripheral clock enable */
RCC_APB1PeriphClockCmd(I2Cx_CLK, ENABLE);
/*SDA GPIO clock enable */
RCC_AHB1PeriphClockCmd(I2Cx_SDA_GPIO_CLK, ENABLE);
/*SCL GPIO clock enable */
RCC_AHB1PeriphClockCmd(I2Cx_SCL_GPIO_CLK, ENABLE);
/* Reset I2Cx IP */
RCC_APB1PeriphResetCmd(I2Cx_CLK, ENABLE);
/* Release reset signal of I2Cx IP */
RCC_APB1PeriphResetCmd(I2Cx_CLK, DISABLE);
/* GPIO Configuration */
/*Configure I2C SCL pin */
GPIO_InitStructure.GPIO_Pin = I2Cx_SCL_PIN;
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(I2Cx_SCL_GPIO_PORT, &GPIO_InitStructure);
/*Configure I2C SDA pin */
GPIO_InitStructure.GPIO_Pin = I2Cx_SDA_PIN;
GPIO_Init(I2Cx_SDA_GPIO_PORT, &GPIO_InitStructure);
/* Connect PXx to I2C_SCL */
GPIO_PinAFConfig(I2Cx_SCL_GPIO_PORT, I2Cx_SCL_SOURCE, I2Cx_SCL_AF);
/* Connect PXx to I2C_SDA */
GPIO_PinAFConfig(I2Cx_SDA_GPIO_PORT, I2Cx_SDA_SOURCE, I2Cx_SDA_AF);
/*I2C Struct Initialize */
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DUTYCYCLE;
I2C_InitStructure.I2C_OwnAddress1 = I2C_SLAVE_ADDRESS7;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_ClockSpeed = I2C_SPEED;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
/*I2C Initialize */
I2C_Init(I2Cx, &I2C_InitStructure);
/* I2C ENABLE */
I2C_Cmd(I2Cx, ENABLE);
}
#define I2C_DLY 1000
U8 I2C_Write(I2C_TypeDef *I2Cn, U8* buf, U32 nbyte){
__IO U32 Timeout = 0;
/* Enable Error IT (used in all modes: DMA, Polling and Interrupts */
// I2Cx->CR2 |= I2C_IT_ERR;
if (nbyte) {
_delay_us(I2C_DLY);
Timed(I2C_GetFlagStatus(I2Cn, I2C_FLAG_BUSY));
// Intiate Start Sequence
I2C_GenerateSTART(I2Cn, ENABLE);
Timed(!I2C_CheckEvent(I2Cn, I2C_EVENT_MASTER_MODE_SELECT));
// Send Address EV5
I2C_Send7bitAddress(I2Cn, I2C_SLAVE_ADDRESS7, I2C_Direction_Transmitter);
Timed(!I2C_CheckEvent(I2Cn, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
// EV6
// Write first byte EV8_1
I2C_SendData(I2Cn, *buf++);
while (--nbyte) {
// wait on BTF
Timed(!I2C_GetFlagStatus(I2Cn, I2C_FLAG_BTF));
I2C_SendData(I2Cn, *buf++);
}
Timed(!I2C_GetFlagStatus(I2Cn, I2C_FLAG_BTF));
I2C_GenerateSTOP(I2Cn, ENABLE);
_delay_us(I2C_DLY);
Timed(I2C_GetFlagStatus(I2Cn, I2C_FLAG_STOPF));
_delay_us(I2C_DLY);
}
return TRUE;
errReturn:
return FALSE;
}
#ifdef FAST_I2C_MODE
#define I2C_SPEED 400000
#define I2C_DUTYCYCLE I2C_DutyCycle_16_9
#else /* STANDARD_I2C_MODE*/
#define I2C_SPEED 100000
#define I2C_DUTYCYCLE I2C_DutyCycle_2
#endif /* FAST_I2C_MODE*/
The error happens when checking I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED.
#define I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED ((uint32_t)0x00070082) /* BUSY, MSL, ADDR, TXE and TRA flags */
