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hmtrp: Initial implementation

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This was tested on the Grove Serial RF Pro.

Signed-off-by: Jon Trulson <jtrulson@ics.com>
Signed-off-by: Zion Orent <zorent@ics.com>
Signed-off-by: John Van Drasek <john.r.van.drasek@intel.com>
This commit is contained in:
John Van Drasek
2015-02-25 09:09:40 -08:00
parent fad4accfcc
commit fab4c26238
9 changed files with 1088 additions and 0 deletions
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src/hmtrp/hmtrp.cxx Normal file
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/*
* Author: Jon Trulson <jtrulson@ics.com>
* Copyright (c) 2015 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include <iostream>
#include "hmtrp.h"
using namespace upm;
using namespace std;
static const int defaultDelay = 100; // max wait time for read
// protocol start code
const uint8_t HMTRP_START1 = 0xaa;
const uint8_t HMTRP_START2 = 0xfa;
HMTRP::HMTRP(int uart)
{
m_ttyFd = -1;
if ( !(m_uart = mraa_uart_init(uart)) )
{
cerr << __FUNCTION__ << ": mraa_uart_init() failed" << endl;
return;
}
// This requires a recent MRAA (1/2015)
char *devPath = mraa_uart_get_dev_path(m_uart);
if (!devPath)
{
cerr << __FUNCTION__ << ": mraa_uart_get_dev_path() failed" << endl;
return;
}
// now open the tty
if ( (m_ttyFd = open(devPath, O_RDWR)) == -1)
{
cerr << __FUNCTION__ << ": open of " << devPath << " failed: "
<< strerror(errno) << endl;
return;
}
}
HMTRP::~HMTRP()
{
if (m_ttyFd != -1)
close(m_ttyFd);
mraa_deinit();
}
bool HMTRP::dataAvailable(unsigned int millis)
{
if (m_ttyFd == -1)
return false;
struct timeval timeout;
timeout.tv_sec = 0;
timeout.tv_usec = millis * 1000;
int nfds;
fd_set readfds;
FD_ZERO(&readfds);
FD_SET(m_ttyFd, &readfds);
if (select(m_ttyFd + 1, &readfds, NULL, NULL, &timeout) > 0)
return true; // data is ready
else
return false;
}
int HMTRP::readData(char *buffer, size_t len, int millis)
{
if (m_ttyFd == -1)
return(-1);
// if specified, wait to see if input shows up, otherwise block
if (millis >= 0)
{
if (!dataAvailable(millis))
return 0; // timed out
}
int rv = read(m_ttyFd, buffer, len);
if (rv < 0)
cerr << __FUNCTION__ << ": read failed: " << strerror(errno) << endl;
return rv;
}
int HMTRP::writeData(char *buffer, size_t len)
{
if (m_ttyFd == -1)
return(-1);
int rv = write(m_ttyFd, buffer, len);
if (rv < 0)
{
cerr << __FUNCTION__ << ": write failed: " << strerror(errno) << endl;
return rv;
}
tcdrain(m_ttyFd);
return rv;
}
bool HMTRP::setupTty(speed_t baud)
{
if (m_ttyFd == -1)
return(false);
struct termios termio;
// get current modes
tcgetattr(m_ttyFd, &termio);
// setup for a 'raw' mode. 81N, no echo or special character
// handling, such as flow control.
cfmakeraw(&termio);
// set our baud rates
cfsetispeed(&termio, baud);
cfsetospeed(&termio, baud);
// make it so
if (tcsetattr(m_ttyFd, TCSAFLUSH, &termio) < 0)
{
cerr << __FUNCTION__ << ": tcsetattr failed: " << strerror(errno) << endl;
return false;
}
return true;
}
bool HMTRP::checkOK()
{
char buf[4];
int rv = readData(buf, 4, defaultDelay);
if (rv != 4)
{
cerr << __FUNCTION__ << ": failed to receive OK response, rv = "
<< rv << ", expected 4" << endl;
return false;
}
// looking for "OK\r\n"
if (buf[0] == 'O' && buf[1] == 'K' &&
buf[2] == '\r' && buf[3] == '\n')
return true;
else
return false;
}
bool HMTRP::reset()
{
char pkt[3];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = RESET;
writeData(pkt, 3);
return checkOK();
}
bool HMTRP::getConfig(uint32_t *freq, uint32_t *dataRate,
uint16_t *rxBandwidth, uint8_t *modulation,
uint8_t *txPower, uint32_t *uartBaud)
{
char pkt[3];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = GET_CONFIG;
writeData(pkt, 3);
usleep(100000);
// now read back a 16 byte response
char buf[16];
int rv = readData(buf, 16, defaultDelay);
if (rv != 16)
{
cerr << __FUNCTION__ << ": failed to receive correct response: rv = "
<< rv << ", expected 16" << endl;
return false;
}
// now decode
if (freq)
{
*freq = ( ((buf[0] & 0xff) << 24) |
((buf[1] & 0xff) << 16) |
((buf[2] & 0xff) << 8) |
(buf[3] & 0xff) );
}
if (dataRate)
{
*dataRate = ( ((buf[4] & 0xff) << 24) |
((buf[5] & 0xff) << 16) |
((buf[6] & 0xff) << 8) |
(buf[7] & 0xff) );
}
if (rxBandwidth)
{
*rxBandwidth = ( ((buf[8] & 0xff) << 8) |
(buf[9] & 0xff) );
}
if (modulation)
{
*modulation = buf[10] & 0xff;
}
if (txPower)
{
*txPower = buf[11] & 0xff;
}
if (uartBaud)
{
*uartBaud = ( ((buf[12] & 0xff) << 24) |
((buf[13] & 0xff) << 16) |
((buf[14] & 0xff) << 8) |
(buf[15] & 0xff) );
}
return true;
}
bool HMTRP::setFrequency(uint32_t freq)
{
char pkt[7];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_FREQUENCY;
pkt[3] = ( ((freq & 0xff000000) >> 24) & 0xff );
pkt[4] = ( ((freq & 0x00ff0000) >> 16) & 0xff );
pkt[5] = ( ((freq & 0x0000ff00) >> 8) & 0xff );
pkt[6] = ( (freq & 0x000000ff) & 0xff );
writeData(pkt, 7);
return checkOK();
}
bool HMTRP::setRFDataRate(uint32_t rate)
{
// Valid values are between 1200-115200
if (rate < 1200 || rate > 115200)
{
cerr << __FUNCTION__ << "Valid values are between 1200-115200." << endl;
return false;
}
char pkt[7];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_RF_DATARATE;
pkt[3] = ( ((rate & 0xff000000) >> 24) & 0xff );
pkt[4] = ( ((rate & 0x00ff0000) >> 16) & 0xff );
pkt[5] = ( ((rate & 0x0000ff00) >> 8) & 0xff );
pkt[6] = ( (rate & 0x000000ff) & 0xff );
writeData(pkt, 7);
return checkOK();
}
bool HMTRP::setRXBandwidth(uint16_t rxBand)
{
// Valid values are between 30-620 (in Khz)
if (rxBand < 30 || rxBand > 620)
{
cerr << __FUNCTION__ << "Valid values are between 30-620." << endl;
return false;
}
char pkt[5];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_RX_BW;
pkt[3] = ( ((rxBand & 0xff00) >> 8) & 0xff );
pkt[4] = ( rxBand & 0xff );
writeData(pkt, 5);
return checkOK();
}
bool HMTRP::setFrequencyModulation(uint8_t modulation)
{
// Valid values are between 10-160 (in Khz)
if (modulation < 10 || modulation > 160)
{
cerr << __FUNCTION__ << "Valid values are between 10-160." << endl;
return false;
}
char pkt[4];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_FREQ_MODULATION;
pkt[3] = modulation;
writeData(pkt, 4);
return checkOK();
}
bool HMTRP::setTransmitPower(uint8_t power)
{
// Valid values are between 0-7
if (power > 7)
{
cerr << __FUNCTION__ << "Valid values are between 0-7." << endl;
return false;
}
char pkt[4];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_TX_POWER;
pkt[3] = power;
writeData(pkt, 4);
return checkOK();
}
bool HMTRP::setUARTSpeed(uint32_t speed)
{
// Valid values are between 1200-115200
if (speed < 1200 || speed > 115200)
{
cerr << __FUNCTION__ << "Valid values are between 1200-115200." << endl;
return false;
}
char pkt[7];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = SET_UART_SPEED;
pkt[3] = ( ((speed & 0xff000000) >> 24) & 0xff );
pkt[4] = ( ((speed & 0x00ff0000) >> 16) & 0xff );
pkt[5] = ( ((speed & 0x0000ff00) >> 8) & 0xff );
pkt[6] = ( (speed & 0x000000ff) & 0xff );
writeData(pkt, 7);
return checkOK();
}
bool HMTRP::getRFSignalStrength(uint8_t *strength)
{
if (!strength)
return false;
char pkt[3];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = GET_RF_SIGNAL_STR;
writeData(pkt, 3);
usleep(100000);
// now read back a 1 byte response
char buf;
int rv = readData(&buf, 1, defaultDelay);
if (rv != 1)
{
cerr << __FUNCTION__ << ": failed to receive correct response: rv = "
<< rv << ", expected 1" << endl;
return false;
}
// now decode
*strength = (uint8_t)buf;
return true;
}
bool HMTRP::getModSignalStrength(uint8_t *strength)
{
if (!strength)
return false;
char pkt[3];
pkt[0] = HMTRP_START1;
pkt[1] = HMTRP_START2;
pkt[2] = GET_MOD_SIGNAL_STR;
writeData(pkt, 3);
usleep(100000);
// now read back a 1 byte response
char buf;
int rv = readData(&buf, 1, defaultDelay);
if (rv != 1)
{
cerr << __FUNCTION__ << ": failed to receive correct response: rv = "
<< rv << ", expected 1" << endl;
return false;
}
// now decode
*strength = (uint8_t)buf;
return true;
}