Odd behaviour with F_STATUS register FXOS8700C Hello, When using the FXOS in FIFO mode the FIFO is read out when a watermark interrupt is set. The issue that I am seeing is the register indicates a watermark interrupt 0x54 but after reading the first three samples (0x01 - 0x06) the auto increment goes back to 0x00 and this time the F_STATUS reads 0xFF other values seen in the same read are 0x08, 0x0D as well as others. Unless I am misreading the data something seems wrong here, The F_STATUS register is not reading anything intelligible after its first read and the data from the XYZ axis should be 0g, 0g and 1g but instead I am seeing: X - 0x0000, 0xF8FF... Y - 0xFFBC, 0xE40F... Z - 0x0FA0, 0xC400... of which only the first value makes any sense any help with this issue would be very much appreciated. Thanks K Accelerometers Magnetic Sensors Re: Odd behaviour with F_STATUS register FXOS8700C Hello Kas, See my answer in your another thread - FXOS8700 data appears very noisy Regards, Tomas Re: Odd behaviour with F_STATUS register FXOS8700C Hello Tomas, I am writing my code using mbed, I have included all my code below as requested. Thankfully Kas #include "mbed.h" #include "SDFileSystem.h" //FXOS8700CQ #define FXOS_ADDRESS_W 0x3C #define FXOS_ADDRESS_R 0x3D #define FXOS_STATUS 0x00 #define FXOS_OUT_X_MSB 0x01 #define FXOS_F_SETUP 0x09 #define FXOS_TRIG_CFG 0x0A #define FXOS_SYS_MOD 0x0B #define FXOS_INT_SOURCE 0x0C #define FXOS_WHO_AM_I 0x0D #define FXOS_ID 0xC7 #define FXOS_XYZ_DATA_CFG 0x0E #define FXOS_TRANSIENT_CFG 0x1D #define FXOS_TRANSIENT_SRC 0x1E #define FXOS_ASLP_COUNT 0x29 #define FXOS_CTRL_REG_1 0x2A #define FXOS_CTRL_REG_2 0x2B #define FXOS_CTRL_REG_3 0x2C #define FXOS_CTRL_REG_4 0x2D #define FXOS_CTRL_REG_5 0x2E #define FXOS_OFF_X 0x2F #define FXOS_OFF_Y 0x30 #define FXOS_OFF_Z 0x31 #define FXOS_TEMP 0x51 #define FXOS_M_CTRL_REG_1 0x5B #define FXOS_M_CTRL_REG_2 0x5C #define FXOS_M_CTRL_REG_3 0x5D //FXAS21002C #define FXAS_ADDRESS_W 0x40 #define FXAS_ADDRESS_R 0x41 #define FXAS_STATUS 0x00 #define FXAS_OUT_X_MSB 0x01 #define FXAS_F_SETUP 0x09 #define FXAS_F_EVENT 0x0A #define FXAS_INT_SRC_FLAG 0x0B #define FXAS_WHO_AM_I 0x0C #define FXAS_ID 0xD7 #define FXAS_CTRL_REG_0 0x0D #define FXAS_RT_CFG 0x0E #define FXAS_TEMP 0x12 #define FXAS_CTRL_REG_1 0x13 #define FXAS_CTRL_REG_2 0x14 #define FXAS_CTRL_REG_3 0x15 //Global variables int FXAS_FIFO_FULL_FLAG = 0; int FXOS_FIFO_FULL_FLAG = 0; char fxos_data_1[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; char fxas_data_1[] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}; //Setup UART to PC Serial pc(USBTX, USBRX); //Setup I2C I2C sensors(PTE0, PTE1); //FXOS8700C Control Pins InterruptIn fxos_int1_8700(PTD4); //INT1-8700 InterruptIn fxos_int2_8700(PTA4); //INT2-8700 //FXAS21002C Control Pins InterruptIn fxas_int1_21002(PTA5); //INT1-21002 InterruptIn fxas_int2_21002(PTA13); //INT2-21002 //SD File System SDFileSystem sd(PTD2, PTD3, PTD1, PTD0, "sd"); ////LED Setup DigitalOut led_1(LED1, 1); //red DigitalOut led_2(LED2, 1); //green //DigitalOut led_3(LED3, 1); //blue <- NB!! Wont play nice with SDFileSystem //****************************************************************// //Functions int i2c_write(char address, char device_register, char data){ sensors.start(); sensors.write((char)address); sensors.write((char)device_register); sensors.write((char)data); sensors.stop(); return 0; } int i2c_write(char address, char device_register, int stop){ sensors.start(); sensors.write((char)address); sensors.write((char)device_register); if(stop == 1){ sensors.stop(); } return 0; } char i2c_read(char address, char device_register){ char data; sensors.start(); sensors.write(address); sensors.write(device_register); sensors.start(); sensors.write(address | 0x01); data = (char)sensors.read(0); sensors.stop(); return data; } int i2c_write_verify(char address, char device_register, char data){ char return_data; int return_val; sensors.start(); sensors.write((char)address); sensors.write((char)device_register); sensors.write((char)data); sensors.stop(); sensors.start(); sensors.write(address); sensors.write(device_register); sensors.start(); sensors.write(address | 0x01); return_data = sensors.read(0); sensors.stop(); if (return_data == data){ return_val = 0; } else{ return_val = -1; } return return_val; } int fxas_init() { int return_val = 0; int sensor_id = 0; sensor_id = i2c_read(FXAS_ADDRESS_W, FXAS_WHO_AM_I); // pc.printf("Expected ID from FXAS21002C is 0xD7\n\r"); // pc.printf("Returned value: %X\n\n\r", sensor_id); if (sensor_id == FXAS_ID){ return_val = 0; return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_CTRL_REG_1, 0x00); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_F_SETUP, 0x00); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_F_SETUP, 0x54); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_CTRL_REG_0, 0x03); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_CTRL_REG_2, 0xC2); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_CTRL_REG_3, 0x00); return_val += i2c_write_verify(FXAS_ADDRESS_W, FXAS_CTRL_REG_1, 0x13); } else{ return_val = -1; } return return_val; } int fxos_init() { int return_val = 0; int sensor_id = 0; sensor_id = i2c_read(FXOS_ADDRESS_W, FXOS_WHO_AM_I); // pc.printf("Expected ID from FXOS8700CQ is 0xC7\n\r"); // pc.printf("Returned value: %X\n\n\r", sensor_id); if (sensor_id == FXOS_ID){ return_val = 0; return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_1, 0x00); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_F_SETUP, 0x00); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_F_SETUP, 0x54); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_ASLP_COUNT, 0xFF); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_XYZ_DATA_CFG, 0x02); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_2, 0x00); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_3, 0x02); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_4, 0x41); //Enable FIFO & DRDY Interrupts return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_5, 0x40); //FIFO -> Int_1, DRDY -> Imt_2 return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_M_CTRL_REG_1, 0x00); return_val += i2c_write_verify(FXOS_ADDRESS_W, FXOS_CTRL_REG_1, 0x21); } else{ return_val = -1; } return return_val; } //Interrupt for FXAS21002 INT_1 void read_fxas_data(){ // //Read data from FXAS21002 sensor if(FXAS_FIFO_FULL_FLAG != 2){ FXAS_FIFO_FULL_FLAG = 1; } } //Interrupt for FXOS8700S INT_1 void read_fxos_data(){ //Read data from FXOS8700C sensor if(FXOS_FIFO_FULL_FLAG != 2){ FXOS_FIFO_FULL_FLAG = 1; } } int main() { int initilised = 0; int index = 0; int test_index = 0; int fxos_data_flag_1 = 0; int fxas_data_flag_1 = 0; //Configure interrupts fxas_int1_21002.rise(&read_fxas_data);//FIFO -> Int_1 // fxas_int2_21002.rise(&read_fxas_data);//DRDY -> Int_2 fxos_int1_8700.rise(&read_fxos_data);//FIFO -> Int_1 // fxos_int2_8700.rise(&read_fxos_data);//DRDY -> Int_2 sensors.frequency(450000); pc.baud(115200); mkdir("/sd/sensor_data", 0777); FILE *fp = fopen("/sd/sensor_data/data.txt", "w"); if(fp == NULL) { error("Could not open file for write\n"); } fprintf(fp, "Gyro X,\tGyro Y,\tGyro Z,\t\tAcc X,\tACC Y,\tACC Z\n\r\n\r\n\r\n\r"); fclose(fp); //Initlilise the FXOS8700CQ Accelorometer & the FXAS21002C Gyroscope initilised = fxas_init() & fxos_init(); // pc.printf("Returned value: %d\n\n\r", initilised); while(1) { if (FXOS_FIFO_FULL_FLAG == 1){//0.976mg * (fxos_data >> 2) = total g force (8g scale) FXOS_FIFO_FULL_FLAG = 0; i2c_write(FXOS_ADDRESS_W, FXOS_STATUS, 0); sensors.read(FXOS_ADDRESS_R, fxos_data_1, 139, false);//Reads the status register on every pass 0x06 -> 0x00 fxos_data_flag_1 = 1; } if (FXAS_FIFO_FULL_FLAG == 1){//7.8125mdps * fxas_data = total degrees per second (250dps scale) FXAS_FIFO_FULL_FLAG = 0; i2c_write(FXAS_ADDRESS_W, FXAS_STATUS, 0); sensors.read(FXAS_ADDRESS_R, fxas_data_1, 139, false);//Reads the status register on the first if set to otherwise 0x06 -> 0x01 fxas_data_flag_1 = 1; } if ((fxos_data_flag_1 == 1) && (fxas_data_flag_1 == 1)){ //Store data on SD card if (test_index == 0){// <--------- Just till a proper file closing system can be implemented fp = fopen("/sd/sensor_data/data.txt", "a"); if(fp == NULL) { error("Could not open file for write\n"); } } for (index = 0; index < 139; index += 7){ //move data to SD card fprintf(fp, "%d\t%d\t%d\t\t", ((int16_t)((fxos_data_1[(index + 1)] << 😎 | fxos_data_1[(index + 2)]) >> 2), ((int16_t)((fxos_data_1[(index + 3)] << 😎 | fxos_data_1[(index + 4)]) >> 2), ((int16_t)((fxos_data_1[(index + 5)] << 😎 | fxos_data_1[(index + 6)]) >> 2)); fprintf(fp, "%d\t%d\t%d\n\r\n\r", ((int16_t)((fxas_data_1[(index + 1)] << 😎 | fxas_data_1[(index + 2)])), ((int16_t)((fxas_data_1[(index + 3)] << 😎 | fxas_data_1[(index + 4)])), ((int16_t)((fxas_data_1[(index + 5)] << 😎 | fxas_data_1[(index + 6)]))); } fxos_data_flag_1 = 0; fxas_data_flag_1 = 0; test_index++; // fprintf(fp, "\n\r\n\r\n\r\n\r\n\r\n\r"); if (test_index == 30){// <--------- Just till a proper file closing system can be implemented fclose(fp); test_index = 0;; } for (int i = 0; i < 139; i++){ fxos_data_1[i] = 0; fxas_data_1[i] = 0; } } Re: Odd behaviour with F_STATUS register FXOS8700C Hello Kas, Could you please post here your complete source code so I can review it and reproduce your settings? Meanwhile, I would recommend you to take a look at our AN4073 including several code examples. Regards, Tomas
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