STM32F4 I2C Receiver Problem

[Philipp M. (lord-maricek)]

Hallo,

ich spiele zurzeit mit STM332F4Discovery I2C rum. Als Slave habe ich 
einen Arduino Duemilanove verwendet. (mit Receive und Request Events)

#include <Wire.h>

void setup()
{
  Wire.begin(0xAA);                // join i2c bus with address #4
  Wire.onReceive(receiveEvent); // register event
  Wire.onRequest(requestEvent);
  Serial.begin(115200);           // start serial for output
}

void loop()
{
  delay(100);
}

void receiveEvent(int howMany)
{
  while(1 < Wire.available()) // loop through all but the last
  {
    char c = Wire.read(); // receive byte as a character
    Serial.print(c);         // print the character
  }
  char x = Wire.read();    // receive byte as an integer
  Serial.println(x);         // print the integer
}

void requestEvent()
{
  Wire.write("hello"); // respond with message of 6 bytes
                       // as expected by master
}

Das Senden von Zeichen an den Arduino geht auch, aber wenn ich danach 
vom Arduino lesen möchte, (mit Wire.write()), bleibt der Stm32 an dieser 
Stelle in der while Schleife hängen: I2C2 an PB10/11; Atollic Studio 3.0

I2C_Send7bitAddress(I2C2, 0xAA >> 1, I2C_Direction_Receiver);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == SET) {
    ;
  }

Hier einmal der Code, das ist nur ein reiner Test:

#include "stm32f4xx.h"

volatile unsigned int counter = 0;
volatile uint16_t arr[500];

/* Private macro */
/* Private variables */
void Delay(__IO uint32_t nCount);
/* Private function prototypes */
void setup_gps(void);
void setup_pc(void);
void setup_led(void);
void setup_exti_line0(void);

void setup_i2c();
void write_LSM303DLH(uint8_t adr, uint8_t * data, uint8_t lenght,
    uint8_t offset);
void read_LSM303DLH(uint8_t adr, uint8_t * data, uint8_t lenght, uint8_t index);
/* Private functions */

/**
 **===========================================================================
 **
 **  Abstract: main program
 **
 **===========================================================================
 */
int main(void) {
  SystemInit();

  int i = 0;

  uint64_t adr = 0x080E0000;

  /*uint64_t def =  *((uint64_t*)0x1FFF7A10);

   uint64_t read_data = *((uint64_t*)adr);

   *((uint64_t*)adr) = 0x00000000;

   uint64_t read_data2 = *((uint64_t*)adr);*/
  setup_gps();
  setup_pc();
  setup_led();
  setup_exti_line0();
  setup_i2c();

  Delay(0x3FFFFF);

  ///////////////////////////////////////////////////////////////////////////////
  /*uint8_t t[] = { 0x02, 0x00 };
   write_LSM303DLH(MAG_ADDRESS, t, 2, 0);
   t[0] = 0x00;
   t[1] = (1 << 3) | (1 << 4);
   write_LSM303DLH(MAG_ADDRESS, t, 2, 0);
   Delay(0x3FFFFF);
   t[0] = 0x20;
   t[1] = 0x27;
   write_LSM303DLH(ACC_ADDRESS, t, 2, 0);
   Delay(0x3FFFFF);
   uint8_t out[] = { 0, 0, 0, 0, 0, 0, 0 };
   read_LSM303DLH(MAG_ADDRESS, out, 6, 0x03);
   int x = 0, y = 0, z = 0;
   x = (out[0] << 8 | out[1]);
   y = (out[2] << 8 | out[3]);
   z = (out[4] << 8 | out[5]);*/

  while (I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) == SET) {
    ;
  }

  I2C_GenerateSTART(I2C2, ENABLE);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) == SET) {
    ;
  }

  I2C_Send7bitAddress(I2C2, 0xAA >> 1, I2C_Direction_Transmitter);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)
      == SET) {
    ;
  }

  I2C_SendData(I2C2, 'H');
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == SET) {
    ;
  }

  I2C_SendData(I2C2, 'E');
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_TRANSMITTED) == SET) {
    ;
  }
  I2C_GenerateSTOP(I2C2, ENABLE);

  /////////////////////////////////////////////////////////////////////////////////////////////

  while (I2C_GetFlagStatus(I2C2, I2C_FLAG_BUSY) == SET) {
    ;
  }

  I2C_GenerateSTART(I2C2, ENABLE);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_MODE_SELECT) == SET) {
    ;
  }

  I2C_Send7bitAddress(I2C2, 0xAA >> 1, I2C_Direction_Receiver);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_RECEIVER_MODE_SELECTED) == SET) {
    ;
  }

  char abc[5];

  abc[0] = I2C_ReceiveData(I2C2);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED) == SET) {
    ;
  }

  abc[1] = I2C_ReceiveData(I2C2);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED) == SET) {
    ;
  }

  abc[2] = I2C_ReceiveData(I2C2);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED) == SET) {
    ;
  }

  abc[3] = I2C_ReceiveData(I2C2);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED) == SET) {
    ;
  }

  abc[4] = I2C_ReceiveData(I2C2);
  while (!I2C_CheckEvent(I2C2, I2C_EVENT_MASTER_BYTE_RECEIVED) == SET) {
    ;
  }

  I2C_GenerateSTOP(I2C2, ENABLE);


  USART_SendData(USART2,abc[0]);
  USART_SendData(USART2,abc[1]);
  USART_SendData(USART2,abc[2]);
  USART_SendData(USART2,abc[3]);
  USART_SendData(USART2,abc[4]);
  /////////////////////////////////////////////////////////////////

  while (1) {

  }
}

void setup_i2c() {

  /*  GPIO Setup  */
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C2, ENABLE);

  GPIO_PinAFConfig(GPIOB, GPIO_PinSource10, GPIO_AF_I2C2);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource11, GPIO_AF_I2C2);

  GPIO_InitTypeDef GPIO_I2C;
  GPIO_I2C.GPIO_Pin = GPIO_Pin_10 | GPIO_Pin_11;
  GPIO_I2C.GPIO_Mode = GPIO_Mode_AF;
  GPIO_I2C.GPIO_OType = GPIO_OType_OD;
  GPIO_I2C.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_I2C.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_I2C);

  /*  I2C Setup  */
  I2C_InitTypeDef I2C_init;
  I2C_init.I2C_Mode = I2C_Mode_I2C;
  I2C_init.I2C_ClockSpeed = 400000;
  I2C_init.I2C_DutyCycle = I2C_DutyCycle_16_9;
  I2C_init.I2C_OwnAddress1 = 0x00;
  I2C_init.I2C_Ack = I2C_Ack_Enable;
  I2C_init.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_Init(I2C2, &I2C_init);

  I2C_Cmd(I2C2, ENABLE);
}

Hab ein paar Initfunktionen für USART usw. rausgelassen, damits 
übersichtlicher ist.


Eine andere Frage noch.

Ich muss am Anfang diese Funktion aufrufen, sonst passt das Timing des 
Prozessors nicht.
SystemInit();
Aber normalerweise wird das doch automatisch in der startup Datei 
gemacht?

MfG
Philipp

[Lasse S. (cowz)]

Nettiquette und "Wichtige Regeln".

Längeren Sourcecode als Anhang, Suche benutzen. Zum Thema STM32 und I2C 
solltest du hier einiges finden.

Gruß
Lasse

[Philipp M. (lord-maricek)]

Sorry hatte ich nicht mehr dran gedacht. Hier das Eclipse Projekt: