I want to get data from an ADXL345 accelerometer, but it seems that I incorrectly connect it.
SCL- PC6 (with a 10 kΩ pull-up resistor)
SDA- PC7 (with a 10 kΩ pull-up resistor)
SDO- GND
CS - VCC
GND - GND
3.3 V - VCC
Here is my code to initialize:
void I2CG_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
I2C_InitTypeDef I2C_InitStructure;
RCC_AHBPeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
RCC_AHBPeriphClockCmd(RCC_APB2Periph_GPIOC, ENABLE);
// I2CG clock enable
RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2CG, ENABLE);
RCC_AHBPeriphClockCmd(RCC_APB1Periph_I2CG, ENABLE);
// GPIOB clock enable
// I2CG SCL and SDA configuration
GPIO_InitStructure.GPIO_Pin = SCL|SDA;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_OD;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Enable I2CG reset state
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2CG, ENABLE);
// Release I2CG from reset state
RCC_APB1PeriphResetCmd(RCC_APB1Periph_I2CG, DISABLE);
I2C_DeInit(I2C1);
I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
I2C_InitStructure.I2C_DutyCycle = I2C_DutyCycle_16_9;
I2C_InitStructure.I2C_OwnAddress1 = 1;
I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
I2C_InitStructure.I2C_ClockSpeed = ClockSpeed;
I2C_Init(I2CG, &I2C_InitStructure);
I2C_Cmd(I2CG, ENABLE);
I2C_AcknowledgeConfig(I2CG, ENABLE);
}
In one example I saw
GPIO_PinAFConfig(GPIOC, SCLSource, GPIO_AF_I2CG);
GPIO_PinAFConfig(GPIOC, SDASource, GPIO_AF_I2CG);
But I don't have this API available.
I tried many solutions and also tried to connect through SPI, but without any success :( How can I fix it?
SCL- PC6 (with a 10 kΩ pull-up resistor)
SDA- PC7 (with a 10 kΩ pull-up resistor)
SCL and SDA should be connected directly. You should use pull-up resistors like on this scheme.
Your initialization code looks OK, so maybe the hardware wiring is wrong?
