Guten Abend Forum,
Ich habe folgenden Code auf einem STM32F407-Discovery-Board:
1 | #include "main.h"
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2 | #include "stm32f4xx_i2c.h"
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3 |
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4 | GPIO_InitTypeDef GPIO_InitStructure;
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5 |
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6 | void init(void)
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7 | {
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8 | //Quelle: Elia's Electronics Blog
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9 | GPIO_InitTypeDef GPIO_InitStruct;
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10 | I2C_InitTypeDef I2C_InitStruct;
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11 |
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12 | // enable APB1 peripheral clock for I2C1
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13 | RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
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14 | // enable clock for SCL and SDA pins
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15 | RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);
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16 |
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17 | /* setup SCL and SDA pins
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18 | * You can connect the I2C1 functions to two different
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19 | * pins:
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20 | * 1. SCL on PB6 or PB8
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21 | * 2. SDA on PB7 or PB9
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22 | */
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23 | GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7 | GPIO_Pin_8; // we are going to use PB6 and PB9
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24 | GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; // set pins to alternate function
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25 | GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; // set GPIO speed
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26 | GPIO_InitStruct.GPIO_OType = GPIO_OType_OD; // set output to open drain --> the line has to be only pulled low, not driven high
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27 | GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; // enable pull up resistors
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28 | GPIO_Init(GPIOB, &GPIO_InitStruct); // init GPIOB
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29 |
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30 | // Connect I2C1 pins to AF
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31 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource8, GPIO_AF_I2C1); // SCL
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32 | GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_I2C1); // SDA
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33 |
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34 | // configure I2C1
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35 | I2C_InitStruct.I2C_ClockSpeed = 10000; // 10kHz
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36 | I2C_InitStruct.I2C_Mode = I2C_Mode_I2C; // I2C mode
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37 | I2C_InitStruct.I2C_DutyCycle = I2C_DutyCycle_2; // 50% duty cycle --> standard
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38 | I2C_InitStruct.I2C_OwnAddress1 = 0x00; // own address, not relevant in master mode
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39 | I2C_InitStruct.I2C_Ack = I2C_Ack_Disable; // disable acknowledge when reading (can be changed later on)
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40 | I2C_InitStruct.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit; // set address length to 7 bit addresses
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41 | I2C_Init(I2C1, &I2C_InitStruct); // init I2C1
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42 |
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43 | // enable I2C1
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44 | I2C_Cmd(I2C1, ENABLE);
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45 | }
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46 |
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47 | int main(void)
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48 | {
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49 | uint8_t feld1[1000];
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50 | uint16_t m;
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51 | init();
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52 | for(m=0; m<1000; m++)
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53 | {
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54 | feld1[m]=0x00;
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55 | }
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56 | while (1)
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57 | {
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58 | }
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59 | }
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Entwicklungsumgebung ist KEIL µVision.
Das Problem ist, dass in I2C_Init(I2C1, &I2C_InitStruct) der
HardFault_Handler aufgerufen wird.
Woran liegt das? Wenn ich feld1 nur mit einer Länge von 100 anlege
passiert dieser Fehler nicht. Läuft da der Speicher für Variablen über
und überschreibt die i2c-init-Funktion? Wie groß ist denn dieser
Speicherbereich?
Floid
