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mhz16: throw exception(s) on fatal errors

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Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Mihai Tudor Panu <mihai.tudor.panu@intel.com>
This commit is contained in:
Jon Trulson 2015-09-10 15:46:57 -06:00 committed by Mihai Tudor Panu
parent 0db47c7528
commit 14fc909400
1 changed files with 30 additions and 16 deletions
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46
src/mhz16/mhz16.cxx
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@ -23,6 +23,8 @@
*/
#include <iostream>
#include <string>
#include <stdexcept>
#include "mhz16.h"
@ -37,7 +39,8 @@ MHZ16::MHZ16(int uart)
if ( !(m_uart = mraa_uart_init(uart)) )
{
cerr << __FUNCTION__ << ": mraa_uart_init() failed" << endl;
throw std::invalid_argument(std::string(__FUNCTION__) +
": mraa_uart_init() failed");
return;
}
@ -46,15 +49,18 @@ MHZ16::MHZ16(int uart)
if (!devPath)
{
cerr << __FUNCTION__ << ": mraa_uart_get_dev_path() failed" << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": mraa_uart_get_dev_path() failed");
return;
}
// now open the tty
if ( (m_ttyFd = open(devPath, O_RDWR)) == -1)
{
cerr << __FUNCTION__ << ": open of " << devPath << " failed: "
<< strerror(errno) << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": open of " +
string(devPath) + " failed: " +
string(strerror(errno)));
return;
}
}
@ -102,7 +108,12 @@ int MHZ16::readData(char *buffer, int len)
int rv = read(m_ttyFd, buffer, len);
if (rv < 0)
cerr << __FUNCTION__ << ": read failed: " << strerror(errno) << endl;
{
throw std::runtime_error(std::string(__FUNCTION__) +
": read() failed: " +
string(strerror(errno)));
return rv;
}
return rv;
}
@ -119,7 +130,9 @@ int MHZ16::writeData(char *buffer, int len)
if (rv < 0)
{
cerr << __FUNCTION__ << ": write failed: " << strerror(errno) << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": write() failed: " +
string(strerror(errno)));
return rv;
}
@ -149,7 +162,9 @@ bool MHZ16::setupTty(speed_t baud)
// make it so
if (tcsetattr(m_ttyFd, TCSAFLUSH, &termio) < 0)
{
cerr << __FUNCTION__ << ": tcsetattr failed: " << strerror(errno) << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": tcsetattr() failed: " +
string(strerror(errno)));
return false;
}
@ -160,7 +175,8 @@ bool MHZ16::verifyPacket(uint8_t *pkt, int len)
{
if (pkt[0] != 0xff || pkt[1] != 0x86)
{
cerr << __FUNCTION__ << ": Inavlid packet header." << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": invalid packet header received");
return false;
}
@ -178,7 +194,8 @@ bool MHZ16::getData(int *gas, int *temp)
// wait up to one second for a response
if (!dataAvailable(1000))
{
cerr << __FUNCTION__ << ": Timed out waiting for response." << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": Timed out waiting for response");
return false;
}
@ -188,16 +205,13 @@ bool MHZ16::getData(int *gas, int *temp)
if ((rv = readData((char *)packet, 9)) != 9)
{
cerr << __FUNCTION__ << ": Invalid packet read, rv = " << rv
<< ", expected 9." << endl;
throw std::runtime_error(std::string(__FUNCTION__) +
": Invalid packet size read");
return false;
}
if (!verifyPacket(packet, 9))
{
cerr << __FUNCTION__ << ": Packet verify failed." << endl;
return false;
}
// will throw an exception if it fails
verifyPacket(packet);
// pull out the data and return it.
*gas = (packet[2] << 8) | packet[3];