/**
* Read exactly one byte from the bus
*
* @throws std::invalid_argument in case of error
* @return char read from the bus
*/
uint8_t
readByte()
{
int x = mraa_i2c_read_byte(m_i2c);
if (x == -1) {
throw std::invalid_argument("Unknown error in I2c::readByte()");
}
return (uint8_t) x;
}
mrb_value
mrb_mraa_i2c_read_byte(mrb_state *mrb, mrb_value self){
mraa_i2c_context i2c;
uint8_t rdata;
Data_Get_Struct(mrb, self, &mrb_mraa_i2c_ctx_type, i2c);
rdata = mraa_i2c_read_byte(i2c);
return mrb_fixnum_value(rdata);
}
int main()
{
uint8_t event_type;
int exit_code;
mraa_init();
//Declaring opaque pointer to the internal struct_i2c
mraa_i2c_context i2c;
i2c = mraa_i2c_init(0);
//If no i2c connection is detected
if (i2c == NULL)
{
system("echo $(date) No I2C connection detected. >> log.txt");
return 0;
}
//Setting the i2c context address
mraa_i2c_address(i2c, I2C_ADDRESS);
//Reading a single byte from the i2c context.
event_type = mraa_i2c_read_byte(i2c);
if (event_type != -1)
{
if (event_type == 'A')
{
system("echo Entered event A >> log.txt");
}
else if (event_type == 'B')
{
system("echo Entered event B >> log.txt");
}
else
{
system("echo $(date) Wrong wake-up character received. >> log.txt");
}
//Waiting for one second to ensure program stability
sleep(1);
//Writing a single byte back to the i2c context
mraa_i2c_write_byte(i2c, 1);
//De-initializing the mraa_i2c_context device.
mraa_i2c_stop(i2c);
}
if (event_type == 'A' || event_type == 'B')
{
//Shutdown intel edison if program ran successfully.
system("shutdown -h now");
}
else
{
system("echo $(date) No data received!!!!! >> log.txt");
//De-initialize the mraa_i2c_context device
mraa_i2c_stop(i2c);
}
return 0;
}
/**
* Read exactly one byte from the bus
*
* @return char read from the bus
*/
uint8_t readByte() {
return (uint8_t) mraa_i2c_read_byte(m_i2c);
}