Question
stm32f0 problem with i2c connection...
Posted on May 16, 2013 at 13:11
on the terminal always gets only same 0.in which place I am doing something wrong? please help!
#include ''stm32f0xx.h''
#include ''stm32f0xx_rcc.h''
#include ''stm32f0xx_gpio.h''
#include ''stm32f0xx_usart.h''
#include ''stm32f0xx_i2c.h''
#include <
stdio.h
>
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
#define MPU6050_W 0x68 //0xD0
#define MPU6050_R 0x69
#define MPU6050_RA_WHO_AM_I 0x75
#define SLAVE_ADDRESS7 0x68<<
1
void USART_send( unsigned char data){
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data);
}
void USART_putstring(char* StringPtr){
while(*StringPtr != 0x00){
USART_send(*StringPtr);
StringPtr++;}
}
void frej(uint8_t value)
{
int
maska
=
0x01
;
int i;
for(
i
=
7
;i>=0;i--){
int l = (((int)value)>>i)&maska;
char t = (char)(l+48);
USART_send(t);
}
USART_send(' ');
}
void SingleRead(uint8_t RegisterAddr) {
/*
1. Send a start sequence
2. Send I2C address of the device with the R/W bit low (W address)
3. Send Internal address of the bearing register
4. Send a start sequence again (repeated start)
5. Send I2C address of the device with the R/W bit high (R address)
6. Read data byte from i2c
7. Send the stop sequence
*/
I2C_GenerateSTART(I2C1, ENABLE);
//I2C_AcknowledgeConfig(I2C1, ENABLE);
I2C_SendData(I2C1, MPU6050_W);
I2C_SendData(I2C1, RegisterAddr);
I2C_GenerateSTART(I2C1, ENABLE);
I2C_SendData(I2C1, MPU6050_R);
frej(I2C_ReceiveData(I2C1));
//I2C_AcknowledgeConfig(I2C1, DISABLE);
I2C_GenerateSTOP(I2C1, ENABLE);
}
void LED_init(void){
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_8;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void USART_init(void){
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
//Configure pins: Rx and Tx --------------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1,ENABLE);
}
void I2C_init(void){
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);
//Configure pins: SCL and SDA ------------------
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
GPIO_Init(GPIOB, &GPIO_InitStructure);
I2C_Cmd(I2C1, ENABLE);
I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Disable;
I2C_InitStructure.I2C_DigitalFilter = 0x00;
I2C_InitStructure.I2C_OwnAddress1 = 0x68; // MPU6050 7-bit adress = 0x68, 8-bit adress = 0xD0;
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_Timing = 0xA0120227;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_Init(I2C1, &I2C_InitStructure);
}
int main(void)
{
LED_init();
USART_init();
I2C_init();
while(1)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); // Wait for Empty
SingleRead(MPU6050_RA_WHO_AM_I);
/*
int i=0;
if(USART_ReceiveData(USART1)=='x'){
GPIO_SetBits(GPIOC, GPIO_Pin_8);
}
for(i=0;i<1000000;i++);
GPIO_ResetBits(GPIOC, GPIO_Pin_8);
for(i=0;i<1000000;i++);
*/
}
}