Hallo,
ich bin gerade beim einarbeiten in den STM32F4. Dabei ferwende ich das
STM32F4 Discovery Board. Zurzeit versuche ich I2C zum laufen zu bringen,
scheitere aber daran, dass der STM32 nach dem Senden der Geräteadresse
hängt.
Folgende Initialisierung verwende ich:
1 | void i2c_init(void)
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2 | {
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3 | GPIO_InitTypeDef GPIO_InitStructure;
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4 | I2C_InitTypeDef I2C_InitStructure;
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5 |
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6 | // Enable Clk
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7 | RCC_APB1PeriphClockCmd(IMU_I2C_CLK, ENABLE);
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8 | RCC_AHB1PeriphClockCmd(IMU_I2C_SCL_GPIO_CLK | IMU_I2C_SDA_GPIO_CLK, ENABLE);
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9 |
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10 | // Performing a Reset
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11 | RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE);
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12 | RCC_APB1PeriphResetCmd(IMU_I2C_CLK, ENABLE);
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13 | RCC_APB1PeriphResetCmd(IMU_I2C_CLK, DISABLE);
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14 |
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15 | // Remap Pins
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16 | GPIO_PinAFConfig(IMU_I2C_SCL_GPIO_PORT, IMU_I2C_SCL_SOURCE, IMU_I2C_SCL_AF);
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17 | GPIO_PinAFConfig(IMU_I2C_SDA_GPIO_PORT, IMU_I2C_SDA_SOURCE, IMU_I2C_SDA_AF);
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18 |
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19 | // Initialize SCL
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20 | GPIO_InitStructure.GPIO_Pin = IMU_I2C_SCL_PIN;
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21 | GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
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22 | GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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23 | GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
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24 | GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
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25 | GPIO_Init(IMU_I2C_SCL_GPIO_PORT, &GPIO_InitStructure);
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26 |
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27 | // Initialize SDA
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28 | GPIO_InitStructure.GPIO_Pin = IMU_I2C_SDA_PIN;
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29 | GPIO_Init(IMU_I2C_SDA_GPIO_PORT, &GPIO_InitStructure);
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30 |
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31 | // I2C configuration
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32 | I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
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33 | I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_2;
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34 | I2C_InitStructure.I2C_OwnAddress1 = 0;
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35 | I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
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36 | I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
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37 | I2C_InitStructure.I2C_ClockSpeed = 100000;
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38 |
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39 | I2C_Cmd(IMU_I2C, ENABLE);
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40 | I2C_Init(IMU_I2C, &I2C_InitStructure);
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41 | }
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Beim Versuch ein Byte zu senden, hängt STM32 bei
while(!I2C_CheckEvent(I2C1,
I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED));
1 | void i2c_write_buf(uint8_t address, uint8_t* buf, int32_t len)
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2 | {
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3 | while(I2C_GetFlagStatus(I2C1, I2C_FLAG_BUSY));
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4 |
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5 | /* Send I2C1 START condition */
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6 | I2C_GenerateSTART(I2C1, ENABLE);
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7 |
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8 | /* Test on I2C1 EV5 and clear it */
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9 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_MODE_SELECT));
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10 |
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11 | /* Send slave Address for write */
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12 | I2C_Send7bitAddress(I2C1, address, I2C_Direction_Transmitter);
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13 |
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14 | /* Test on I2C1 EV6 and clear it */
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15 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); //Hier hängt das I2C Modul
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16 |
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17 | while(len--)
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18 | {
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19 | /* Send I2C1 slave register address */
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20 | I2C_SendData(I2C1, *buf++);
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21 |
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22 | /* Test on I2C1 EV8_2 and clear it */
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23 | while(!I2C_CheckEvent(I2C1, I2C_EVENT_MASTER_BYTE_TRANSMITTED));
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24 | }
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25 |
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26 | /* Send I2C1 STOP Condition */
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27 | I2C_GenerateSTOP(I2C1, ENABLE);
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28 | }
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Ich habe mich beim der Initialisierung sowie beim Senden and das
Beispiel der Standard Peripheral Library gehalten. Am I2C Bus hängt ein
Kompass-IC. Externe Pullups sind vorhanden.
Ich finde leider den Fehler nicht. Hat jemand eine Idee woran es liegen
könnte?
Danke im Voraus
Robert
