sakthi priya amirtharaj
/
BAE_hw_test1_5
with i2c
Fork of BAE_b4hw_test by
mnm.cpp
- Committer:
- sakthipriya
- Date:
- 2015-02-05
- Revision:
- 5:4199c0dfed33
- Child:
- 7:603c2a89effc
File content as of revision 5:4199c0dfed33:
#include<mbed.h> #include "mnm.h" #include "pni.h" //pni header file Serial mnm(USBTX,USBRX); //for usb communication I2C i2c (PTC9,PTC8); //PTC2-sda,PTC1-scl /*void INIT_PNI(void); //initialization of registers happens float *EXECUTE_PNI(); //data is obtained void T_OUT(); //timeout function to stop infinite loop*/ Timeout to; //Timeout variable to int toFlag; void T_OUT() { toFlag=0; //as T_OUT function gets called the while loop gets terminated } //DEFINING VARIABLES char cmd[2]; char raw_gyro[6]; char raw_mag[6]; char store,status; int16_t bit_data; float gyro_data[3], mag_data[3],combined_values[6],*data; float senstivity_gyro =6.5536; //senstivity is obtained from 2^15/5000dps float senstivity_mag =32.768; //senstivity is obtained from 2^15/1000microtesla float gyro_error[3]= {0,0,0}, mag_error[3]= {0,0,0}; /* int main(void) { INIT_PNI(); data=EXECUTE_PNI(); //the angular velocity is stored in the first 3 values and magnetic field values in next 3 mnm.printf("gyro values\n"); //printing the angular velocity and magnetic field values for(int i=0; i<3; i++) { mnm.printf("%f\t",data[i]); } mnm.printf("mag values\n"); for(int i=3; i<6; i++) { mnm.printf("%f\t",data[i]); } }*/ void INIT_PNI() { cmd[0]=RESETREQ; cmd[1]=BIT_RESREQ; i2c.write(SLAVE_ADDR,cmd,2); //When 0x01 is written in reset request register Emulates a hard power down/power up wait_ms(2000); //waiting for loading configuration file stored in EEPROM cmd[0]=SENTRALSTATUS; i2c.write(SLAVE_ADDR,cmd,1); i2c.read(SLAVE_ADDR_READ,&store,1); wait_ms(100); //to check whether EEPROM is uploaded switch((int)store) { case(3): { break; } case(11): { break; } default: { cmd[0]=RESETREQ; cmd[1]=BIT_RESREQ; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(2000); } } //mnm.printf("Sentral Status is %x\n",(int)store); cmd[0]=HOST_CTRL; //0x01 is written in HOST CONTROL register to enable the sensors cmd[1]=BIT_RUN_ENB; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(100); cmd[0]=MAGRATE; //Output data rate of 100Hz is used for magnetometer cmd[1]=BIT_MAGODR; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(100); cmd[0]=GYRORATE; //Output data rate of 150Hz is used for gyroscope cmd[1]=BIT_GYROODR; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(100); cmd[0]=ALGO_CTRL; //When 0x00 is written to ALGO CONTROL register we get scaled sensor values cmd[1]=0x00; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(100); cmd[0]=ENB_EVT; //enabling the error,gyro values and magnetometer values cmd[1]=BIT_EVT_ENB; i2c.write(SLAVE_ADDR,cmd,2); wait_ms(100); } float *EXECUTE_PNI() { //printf("\n\r mnm func \n"); toFlag=1; //toFlag is set to 1 so that it enters while loop to.attach(&T_OUT,2); //after 2 seconds the while loop gets terminated while(toFlag) { cmd[0]=EVT_STATUS; i2c.write(SLAVE_ADDR,cmd,1); i2c.read(SLAVE_ADDR_READ,&status,1); wait_ms(100); //mnm.printf("\nEvent Status is %x\n",(int)status); //if the 6th and 4th bit are 1 then it implies that gyro and magnetometer values are ready to take if(((int)status&40)==40) { printf("\nin if of mnm\n"); cmd[0]=GYRO_XOUT_H; //0x22 gyro LSB of x i2c.write(SLAVE_ADDR,cmd,1); i2c.read(SLAVE_ADDR_READ,raw_gyro,6); cmd[0]=MAG_XOUT_H; //LSB of x i2c.write(SLAVE_ADDR,cmd,1); i2c.read(SLAVE_ADDR_READ,raw_mag,6); //mnm.printf("\nGyro Values:\n"); for(int i=0; i<3; i++) { //concatenating gyro LSB and MSB to get 16 bit signed data values bit_data= ((int16_t)raw_gyro[2*i+1]<<8)|(int16_t)raw_gyro[2*i]; gyro_data[i]=(float)bit_data; gyro_data[i]=gyro_data[i]/senstivity_gyro; gyro_data[i]+=gyro_error[i]; //mnm.printf("%f\t",gyro_data[i]); } //mnm.printf("\nMag Values:\n"); for(int i=0; i<3; i++) { //concatenating mag LSB and MSB to get 16 bit signed data values bit_data= ((int16_t)raw_mag[2*i+1]<<8)|(int16_t)raw_mag[2*i]; mag_data[i]=(float)bit_data; mag_data[i]=mag_data[i]/senstivity_mag; mag_data[i]+=mag_error[i]; //mnm.printf("%f\t",mag_data[i]); } for(int i=0; i<3; i++) { combined_values[i]=gyro_data[i]; combined_values[i+3]=mag_data[i]; } return(combined_values); //returning poiter combined values } //checking for the error else if (((int)status&2)==2) { INIT_PNI(); //when there is any error then Again inilization is done to remove error } } }