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Library for easy interface of LidarLite with mbed using I2C
Dependents: LidarLite_mbed Lidar_Magnet
Library for easy interface of LidarLite with mbed using I2C
Diff: LidarLite.cpp
- Revision:
- 0:8e6304ab38d2
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/LidarLite.cpp Tue Feb 17 12:01:04 2015 +0000 @@ -0,0 +1,148 @@ +/* + * Library for easy interface of LidarLite with mbed using I2C + * + * Akash Vibhute <akash . roboticist [at] gmail . com> + * + * v0.1, 17/Feb/2015 - First version of library, tested using LPC1768 [powered via mbed 3.3v, no additional pullups on I2C necessary] + * + */ + +#include "LidarLite.h" + +LidarLite::LidarLite(PinName sda, PinName scl) +{ + i2c_ = new I2C(sda, scl); + i2c_->frequency(100000); //I2C @ 100kHz + wait(0.5); +} + +int16_t LidarLite::getRange_cm() +{ + return(distance_LL); +} + +int16_t LidarLite::getVelocity_cms() +{ + if(velocity_LL < 127) + return(velocity_LL*10); + else + return((velocity_LL-256)*10); +} + +void LidarLite::refreshRange() +{ + uint8_t nackack; + + char write[2]={SET_CommandReg, AcqMode}; + char read_dist[1]={GET_Distance2BReg}; + char read_vel[1]={GET_VelocityReg}; + + char dist[2]; + char vel[1]; + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, write, 2); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, read_dist, 1); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->read(LIDARLite_ReadAdr, dist, 2); + } + distance_LL = ((uint16_t)dist[0] << 8) + (uint16_t)dist[1]; +} + +void LidarLite::refreshVelocity() +{ + uint8_t nackack; + + char write[2]={SET_CommandReg, AcqMode}; + char read_dist[1]={GET_Distance2BReg}; + char read_vel[1]={GET_VelocityReg}; + + char dist[2]; + char vel[1]; + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, write, 2); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, read_vel, 1); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->read(LIDARLite_ReadAdr, vel, 1); + } + velocity_LL = (uint16_t)vel[0]; +} + +void LidarLite::refreshRangeVelocity() +{ + uint8_t nackack; + + char write[2]={SET_CommandReg, AcqMode}; + char read_dist[1]={GET_Distance2BReg}; + char read_vel[1]={GET_VelocityReg}; + + char dist[2]; + char vel[1]; + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, write, 2); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, read_dist, 1); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->read(LIDARLite_ReadAdr, dist, 2); + } + distance_LL = ((uint16_t)dist[0] << 8) + (uint16_t)dist[1]; + + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->write(LIDARLite_WriteAdr, read_vel, 1); + } + + nackack=1; + while(nackack !=0) + { + wait_ms(1); + nackack = i2c_->read(LIDARLite_ReadAdr, vel, 1); + } + velocity_LL = (uint16_t)vel[0]; +} \ No newline at end of file