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-rw-r--r--host/lib/usrp/gps_ctrl.cpp39
-rw-r--r--host/lib/usrp/x300/x300_fw_uart.cpp89
2 files changed, 108 insertions, 20 deletions
diff --git a/host/lib/usrp/gps_ctrl.cpp b/host/lib/usrp/gps_ctrl.cpp
index d327a84f9..b211ba027 100644
--- a/host/lib/usrp/gps_ctrl.cpp
+++ b/host/lib/usrp/gps_ctrl.cpp
@@ -62,6 +62,20 @@ private:
return std::string();
}
+ static bool is_nmea_checksum_ok(std::string nmea)
+ {
+ if (nmea.length() < 5 || nmea[0] != '$' || nmea[nmea.length()-3] != '*')
+ return false;
+
+ uint8_t string_crc = uint8_t(strtol(nmea.substr(nmea.length()-2, 2).c_str(), NULL, 16));
+ uint8_t calculated_crc = 0;
+
+ for (size_t i = 1; i < nmea.length()-3; i++)
+ calculated_crc ^= nmea[i];
+
+ return (string_crc == calculated_crc);
+ }
+
std::string update_cached_sensors(const std::string sensor) {
if(not gps_detected() || (gps_type != GPS_TYPE_INTERNAL_GPSDO)) {
UHD_MSG(error) << "get_stat(): unsupported GPS or no GPS detected";
@@ -70,24 +84,40 @@ private:
const std::list<std::string> list = boost::assign::list_of("GPGGA")("GPRMC")("SERVO");
static const boost::regex status_regex("\\d\\d-\\d\\d-\\d\\d");
+ static const boost::regex gp_msg_regex("^\\$GP.*,\\*[0-9A-F]{2}$");
std::map<std::string,std::string> msgs;
// Get all GPSDO messages available
// Creating a map here because we only want the latest of each message type
for (std::string msg = _recv(); msg.length(); msg = _recv())
{
- if (msg.length() < 6)
- continue;
-
// Strip any end of line characters
erase_all(msg, "\r");
erase_all(msg, "\n");
+ if (msg.length() < 6)
+ {
+#ifdef DEBUG_GPS
+ UHD_MSG(error) << __FUNCTION__ << ": Short NMEA string: " << msg << std::endl;
+#endif
+ continue;
+ }
+
// Look for SERVO message
if (boost::regex_search(msg, status_regex, boost::regex_constants::match_continuous))
+ {
msgs["SERVO"] = msg;
- else
+ }
+ else if (boost::regex_match(msg, gp_msg_regex) && is_nmea_checksum_ok(msg))
+ {
msgs[msg.substr(1,5)] = msg;
+ }
+#ifdef DEBUG_GPS
+ else
+ {
+ UHD_MSG(error) << __FUNCTION__ << ": Malformed NMEA string: " << msg << std::endl;
+ }
+#endif
}
boost::system_time time = boost::get_system_time();
@@ -131,7 +161,6 @@ public:
}
else if(reply.substr(0, 3) == "$GP") i_heard_some_nmea = true; //but keep looking for that "Command Error" response
else if(reply.length() != 0) i_heard_something_weird = true; //probably wrong baud rate
- sleep(milliseconds(GPS_TIMEOUT_DELAY_MS));
}
if((i_heard_some_nmea) && (gps_type != GPS_TYPE_INTERNAL_GPSDO)) gps_type = GPS_TYPE_GENERIC_NMEA;
diff --git a/host/lib/usrp/x300/x300_fw_uart.cpp b/host/lib/usrp/x300/x300_fw_uart.cpp
index 943b2d9fa..4bf103c5a 100644
--- a/host/lib/usrp/x300/x300_fw_uart.cpp
+++ b/host/lib/usrp/x300/x300_fw_uart.cpp
@@ -38,6 +38,8 @@ struct x300_uart_iface : uart_iface
rxpool = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_ADDR));
txpool = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_TX_ADDR));
poolsize = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_WORDS32));
+ _rxcache.resize(poolsize);
+ _last_device_rxoffset = rxoffset;
//this->write_uart("HELLO UART\n");
//this->read_uart(0.1);
}
@@ -63,39 +65,96 @@ struct x300_uart_iface : uart_iface
int getchar(void)
{
- if (_iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_INDEX)) != rxoffset)
+ if (rxoffset == _last_device_rxoffset)
+ return -1;
+
+ rxoffset++;
+ return int(_rxcache[((rxoffset)/4) % poolsize] >> ((rxoffset%4)*8) & 0xFF);
+ }
+
+ void update_cache(void)
+ {
+ uint32_t device_rxoffset = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_INDEX));
+ uint32_t delta = device_rxoffset - rxoffset;
+
+ while (delta)
{
- const int shift = ((rxoffset%4) * 8);
- const char ch = _iface->peek32(SR_ADDR(rxpool, rxoffset/4)) >> shift;
- rxoffset = (rxoffset + 1) % (poolsize*4);
- return ch;
+ if (delta >= poolsize*4)
+ {
+ // all the data is new - reload the entire cache
+ for (uint32_t i = 0; i < poolsize; i++)
+ _rxcache[i] = _iface->peek32(SR_ADDR(rxpool, i));
+
+ // set rxoffset to the end of the first string
+ rxoffset = device_rxoffset - (poolsize*4) + 1;
+ while (uint8_t(_rxcache[(rxoffset/4) % poolsize] >> ((rxoffset % 4) * 8)) != '\n')
+ ++rxoffset;
+
+ // clear the partial string in the buffer;
+ _rxbuff.clear();
+ }
+ else if (rxoffset == _last_device_rxoffset)
+ {
+ // new data was added - refresh the portion of the cache that was updated
+ for (uint32_t i = ((_last_device_rxoffset+1)/4) % poolsize; i != (((device_rxoffset)/4)+1) % poolsize; i = (i+1) % poolsize)
+ {
+ _rxcache[i] = _iface->peek32(SR_ADDR(rxpool, i));
+ }
+ } else {
+ // there is new data, but we aren't done with what we have - check back later
+ break;
+ }
+
+ _last_device_rxoffset = device_rxoffset;
+
+ // check again to see if anything changed while we were updating the cache
+ device_rxoffset = _iface->peek32(SR_ADDR(X300_FW_SHMEM_BASE, X300_FW_SHMEM_UART_RX_INDEX));
+ delta = device_rxoffset - rxoffset;
}
- return -1;
}
std::string read_uart(double timeout)
{
const boost::system_time exit_time = boost::get_system_time() + boost::posix_time::microseconds(long(timeout*1e6));
std::string buff;
+
while (true)
{
- const int ch = this->getchar();
- if (ch == -1)
+ // Update cache
+ this->update_cache();
+
+ // Get available characters
+ for (int ch = this->getchar(); ch != -1; ch = this->getchar())
{
- if (boost::get_system_time() > exit_time) break;
- boost::this_thread::sleep(boost::posix_time::milliseconds(1));
- continue;
+ // skip carriage returns
+ if (ch == '\r')
+ continue;
+
+ // store character to buffer
+ _rxbuff += std::string(1, (char)ch);
+
+ // newline found - return string
+ if (ch == '\n')
+ {
+ buff = _rxbuff;
+ _rxbuff.clear();
+ return buff;
+ }
}
- if (ch == '\r') continue;
- buff += std::string(1, (char)ch);
- if (ch == '\n') break;
+
+ // no more characters - check time
+ if (boost::get_system_time() > exit_time)
+ break;
}
- //UHD_VAR(buff);
+
return buff;
}
wb_iface::sptr _iface;
boost::uint32_t rxoffset, txoffset, txword32, rxpool, txpool, poolsize;
+ boost::uint32_t _last_device_rxoffset;
+ std::vector<uint32_t> _rxcache;
+ std::string _rxbuff;
};
uart_iface::sptr x300_make_uart_iface(wb_iface::sptr iface)
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-27 06:20:49 +0000