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Chào mọi người, mình đang code giao tiếp I2C trên STM8S003F3 nhưng gặp lỗi. Đầu tiên mình khởi tạo xung clock
Sau đó đọc I2C thì bị lỗi:
Sau khi I2C_GenerateSTART(ENABLE); thì nó báo cờ I2C_FLAG_BUSBUSY, nhờ các tiền bối gỡ giúp lỗi này.
Mạch kết nối 2 ngoại vi i2c trên cùng 1 bus, điạ chỉ lần lượt là 0x29 và 0x39.
Code:
CLK_HSIPrescalerConfig(CLK_PRESCALER_HSIDIV1); CLK_PeripheralClockConfig(TCS34725_I2C_CLK, ENABLE); /* I2C configuration */ /* sEE_I2C Peripheral Enable */ I2C_Cmd( ENABLE); /* sEE_I2C configuration after enabling it */ I2C_Init(I2C_MAX_FAST_FREQ, TCS34725_ADDRESS7, I2C_DUTYCYCLE_2, I2C_ACK_CURR, I2C_ADDMODE_7BIT, 16);
Code:
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(I2C_GetFlagStatus( I2C_FLAG_BUSBUSY))
{
if((TCS34725_TimeOut--) == 0) return 99;
}
I2C_GenerateSTART(ENABLE);
I2C_Send7bitAddress(TCS34725_ADDRESS7, TCS34725_DIRECTION_TX);
/* Test on EV5 and clear it (cleared by reading SR1 then writing to DR) */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_MODE_SELECT))
{
if((TCS34725_TimeOut--) == 0) return 88;
}
/* Test on EV6 and clear it */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED))
{
if((TCS34725_TimeOut--) == 0) return 77;
}
/* Test on EV8 and clear it */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(I2C_GetFlagStatus(I2C_FLAG_TRANSFERFINISHED) == RESET)
{
if((TCS34725_TimeOut--) == 0) return 66;
}
/* Send START condition a second time */
I2C_GenerateSTART( ENABLE);
/* Test on EV5 and clear it (cleared by reading SR1 then writing to DR) */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(!I2C_CheckEvent( I2C_EVENT_MASTER_MODE_SELECT))
{
if((TCS34725_TimeOut--) == 0) return 55;
}
/* Send EEPROM address for read */
//I2C_Send7bitAddress(TCS34725_ADDRESS7 , I2C_DIRECTION_RX);
I2C_Send7bitAddress(addr , I2C_DIRECTION_RX);
/* Wait on ADDR flag to be set (ADDR is still not cleared at this level */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(I2C_GetFlagStatus( I2C_FLAG_ADDRESSSENTMATCHED) == RESET)
{
if((TCS34725_TimeOut--) == 0) return 44;
}
/* Disable Acknowledgement */
I2C_AcknowledgeConfig(I2C_ACK_NONE);
/* Call User callback for critical section start (should typically disable interrupts) */
//sEE_EnterCriticalSection_UserCallback();
/* Clear ADDR register by reading SR1 then SR3 register (SR1 has already been read) */
(void)TCS34725_I2C->SR3;
/* Send STOP Condition */
I2C_GenerateSTOP( ENABLE);
/* Call User callback for critical section end (should typically re-enable interrupts) */
//sEE_ExitCriticalSection_UserCallback();
/* Wait for the byte to be received */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(I2C_GetFlagStatus( I2C_FLAG_RXNOTEMPTY) == RESET)
{
if((TCS34725_TimeOut--) == 0) return 33;
}
/* Read the byte received from the EEPROM */
tmp = I2C_ReceiveData();
/* Decrement the read bytes counter */
//(uint16_t)(*NumByteToRead)--;
/* Wait to make sure that STOP control bit has been cleared */
TCS34725_TimeOut = DEFAULT_TIMEOUT;
while(TCS34725_I2C->CR2 & I2C_CR2_STOP)
{
if((TCS34725_TimeOut--) == 0) return 22;
}
/* Re-Enable Acknowledgement to be ready for another reception */
I2C_AcknowledgeConfig( I2C_ACK_CURR);
Mạch kết nối 2 ngoại vi i2c trên cùng 1 bus, điạ chỉ lần lượt là 0x29 và 0x39.
.
, bàn trên đây nó ko hợp thời nữa rồi.... v v Bác nào dùng con nào cứ dùng, ko nên chê bai bĩu môi chip khác 
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