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94 lines
2.5 KiB
94 lines
2.5 KiB
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#include "i2c_ch0_pImpL.hpp"
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// some curious things https://www.john.geek.nz/2012/12/update-reading-data-from-a-bosch-bmp085-with-a-raspberry-pi/
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i2c_ch0_pImpL::i2c_ch0_pImpL(const uint8_t& mode)
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{
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char filename[20];
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snprintf(filename, 19, "/dev/i2c-%d", 0);
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deviceDescriptor = open(filename, O_RDWR);
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if (deviceDescriptor < 0) {
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std::cout << "unable to open : "<< deviceDescriptor << " ! quiting" << std::endl;
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exit(1);
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}
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}
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uint8_t i2c_ch0_pImpL::writeByte(const uint8_t& address, const uint8_t& data) // retuns 0 when a sucsessful transation ocures
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{
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if (ioctl(deviceDescriptor, I2C_SLAVE, address) < 0)
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{
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std::cout << "Unable to reach device : "<< address << " ! quiting" << std::endl;
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exit(1);
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}
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send_buffer[0] = data;
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if ((write(deviceDescriptor, send_buffer, 1)) != 1)
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{
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std::cout << "Unable to write quiting" << std::endl;
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exit(0);
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}
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return 0;
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}
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uint8_t i2c_ch0_pImpL::readByte(const uint8_t& address, const uint8_t& reg)
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{
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if (ioctl(deviceDescriptor, I2C_SLAVE, address) < 0)
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{
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std::cout << "Unable to reach device : "<< address << " ! quiting" << std::endl;
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exit(1);
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}
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writeByte(address,reg); //Initiate a write to indicate the desired register to read
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if (read(deviceDescriptor, recieve_buffer, 1) != 1) // An then initare a read request of 1 byte
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{
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std::cout << "Unable to read quiting" << std::endl;
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exit(1);
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}
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return recieve_buffer[0] ;
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}
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uint8_t i2c_ch0_pImpL::writeWord(const uint8_t& address, const uint8_t& reg, const uint16_t& data) // retuns 0 when a sucsessful transation ocures
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{
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if (ioctl(deviceDescriptor, I2C_SLAVE, address) < 0)
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{
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std::cout << "Unable to reach device : "<< address << " ! quiting" << std::endl;
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exit(1);
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}
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send_buffer[0] = reg;
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send_buffer[1] = data;
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if ((write(deviceDescriptor, send_buffer, 2)) != 2)
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{
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std::cout << "Unable to write quiting" << std::endl;
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exit(0);
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}
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return 0;
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}
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uint16_t i2c_ch0_pImpL::readWord(const uint8_t& address, const uint8_t& reg)
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{
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uint16_t result = 0 ;
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if (ioctl(deviceDescriptor, I2C_SLAVE, address) < 0)
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{
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std::cout << "Unable to reach device : "<< address << " ! quiting" << std::endl;
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exit(1);
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}
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writeByte(address,reg); //Initiate a write to indicate the desired register to read
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if (read(deviceDescriptor, recieve_buffer, 2) != 2) // An then initare a read request of 2 bytes
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{
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std::cout << "Unable to read quiting" << std::endl;
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exit(1);
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}
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result = (recieve_buffer[0] << 8) + recieve_buffer[1] ;
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return result ;
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}
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