Posted on December 12, 2011 at 23:40Hello. I want to read a sequence of bytes from my accelerometer. I can't get it work.
When I read byte by byte all is ok, but when I try to read sequence I can't get a true values.
void ADXL_ReadSeq(uint8_t StartAddr,signed char *data)
{
// StartAddr |= (1<<7); //
while(I2C_GetFlagStatus(I2CG, I2C_FLAG_BUSY)); // While the bus is busy
I2C_GenerateSTART(I2CG, ENABLE); // Send START condition
while(!I2C_CheckEvent(I2CG, I2C_EVENT_MASTER_MODE_SELECT)); // Test on EV5 and clear it
I2C_Send7bitAddress(I2CG, DEV_ADDR<< 1, I2C_Direction_Transmitter); // Send address for write (SAD+W)
while(!I2C_CheckEvent(I2CG, I2C_EVENT_MASTER_TRANSMITTER_MODE_SELECTED)); // Test on EV6 and clear it
I2C_SendData(I2CG,ADXL_R| ADXL_MB|StartAddr ); //Multibyte reading
while(!I2C_CheckEvent(I2CG, I2C_EVENT_MASTER_BYTE_TRANSMITTED)); // Test on EV8 and clear it
I2C_GenerateSTART(I2CG, ENABLE); // Send STRAT condition a second time
while(!I2C_CheckEvent(I2CG, I2C_EVENT_MASTER_MODE_SELECT)); // Test on EV5 and clear it
I2C_Send7bitAddress(I2CG, DEV_ADDR<< 1, I2C_Direction_Receiver); // Send address for read
while(!I2C_CheckEvent(I2CG,I2C_EVENT_MASTER_BYTE_RECEIVED)); // Test on EV6 and clear it
int i=0;
for (i;i<6;i++)
{
I2C_AcknowledgeConfig(I2CG, ENABLE);
data[i]=I2C_ReceiveData(I2CG);
delay(3000);
}
I2C_AcknowledgeConfig(I2CG, DISABLE);
I2C_GenerateSTOP(I2CG, ENABLE); // Send STOP Condition
}
What I'm doing wrong?
I convert this function from other function which uses SPI
http://code.google.com/p/flyless/source/browse/trunk/FLYLess/src/hal/adxl345.c
#i2c #sequence #adxl345 #stm32
