Posted on December 02, 2017 at 12:00
Hi.
Recently i'm using ADXRS453BEYZ but failed to work with it !
I used 5V power supply for sensor and connect it via Buffer to 3.3v ARM microcontroller (STM32f103CBT6).
this is my configs
/*SPI config*/
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
GPIO_InitStructure.GPIO_Pin = SPI2_PIN_SCK | SPI2_PIN_MOSI | SPI2_PIN_MISO;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;GPIO_Init(GPIOB, &GPIO_InitStructure);RCC_APB1PeriphClockCmd(SPI2_RCC,ENABLE); SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex ;SPI_InitStructure.SPI_Mode = SPI_Mode_Master; SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge ;SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;SPI_Init(SPI2, &SPI_InitStructure);/*SPI Peripheral Enable*/SPI_Cmd (SPI2, ENABLE);and this is the sensor data reading function
unsigned long ADXRS453_Data(void)
{ unsigned char data[4] = {0, 0, 0, 0}; unsigned long receivedData = 0x00;/*Reset the CS pin */
GPIO_InitStructure.GPIO_Pin = SPI2_CS_Roll; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_Init(GPIOB, &GPIO_InitStructure);
delay (1000);
data[0] = ADXRS453_SENSOR_DATA; //
ADXRS453_SENSOR_DATA = 0x20
SPI_I2S_SendData (SPI2, data [0]); delay (1000);data[0] = SPI_I2S_ReceiveData (SPI2);
SPI_I2S_SendData (SPI2, data [1]); delay (1000);data[1] = SPI_I2S_ReceiveData (SPI2);
SPI_I2S_SendData (SPI2, data [2]); delay (1000); data[2] = SPI_I2S_ReceiveData (SPI2);SPI_I2S_SendData (SPI2, data [3]);
delay (1000);data[3] = SPI_I2S_ReceiveData (SPI2);
delay (1000);
/*Set the CS pin */
GPIO_InitStructure.GPIO_Pin = SPI2_CS_Roll;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING ; GPIO_Init(GPIOB, &GPIO_InitStructure);
receivedData = data[0];
receivedData = (receivedData<<8) + data[1]; receivedData = (receivedData<<8) + data[2];receivedData = (receivedData<<8) + data[3];
Data = (receivedData >> 10) & 0x0000FFFF;
This is the what i see
:
receivedData == 0xFFFB 3800 // 11111111111110110011100000000000
Data == 0xFECE // 1111111011001110
and it never changes.
I have working on it for 2 weeks and nothing special happened.
i will be thanks full if any one help me on this !
Best regards
Joe
