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Merge pull request #394 from AvSquirrel/gps-uart-fix 

GPS UART fix for RPi 3. Fixes #393.
pull/399/head
cyoung 2016-04-22 07:22:11 -04:00
rodzic 14f35ba81e f6d2ee1898
commit 6e5d449af0
3 zmienionych plików z 79 dodań i 3 usunięć
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3
image/config.txt
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@ -5,3 +5,6 @@ max_usb_current=1
dtparam=i2c1=on
dtparam=i2c1_baudrate=400000
dtparam=i2c_arm_baudrate=400000
# move RPi3 Bluetooth off of hardware UART to free up connection for GPS
dtoverlay=pi3-miniuart-bt

6
main/ry835ai.go
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@ -136,9 +136,9 @@ func initGPSSerial() bool {
device = "/dev/ttyUSB0"
} else if _, err := os.Stat("/dev/ttyACM0"); err == nil {
device = "/dev/ttyACM0"
} else if _, err := os.Stat("/dev/ttyS0"); err == nil {
device = "/dev/ttyS0"
} else if _, err := os.Stat("/dev/ttyAMA0"); err == nil {
//} else if _, err := os.Stat("/dev/ttyS0"); err == nil { // ttyS0 appears to be mini UART on RPi 3
// device = "/dev/ttyS0"
} else if _, err := os.Stat("/dev/ttyAMA0"); err == nil { // ttyAMA0 is PL011 UART (GPIO pins 8 and 10) on all RPi
device = "/dev/ttyAMA0"
} else {
log.Printf("No suitable device found.\n")

73
test/mtk_config.sh 100644
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@ -0,0 +1,73 @@
#!/bin/bash
#
# mtk_config.sh: Script to set up MTK3339 receiver for Stratux.
# Resets receiver to 9600 and 1 Hz GPRMC messaging, then enables
# WAAS, 5 Hz position reporting, the NMEA messages needed by
# Stratux, and 38400 bps serial output.
printf "About to configure MTK3339 receiver on /dev/ttyAMA0.\n"
printf "Press ctrl-C to abort or any other key to continue.\n"
read
# Iterate through common bitrates and send commands to reduce output to 1 Hz / 9600 bps.
printf "Setting MTK and RPi baud rate of /dev/ttyAMA0 to 9600. Iterating through common rates.\n"
printf "Current /dev/ttyAMA0 baudrate.\n"
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
printf "38400 bps.\n"
stty -F /dev/ttyAMA0 38400
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
printf "115200 bps.\n"
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
stty -F /dev/ttyAMA0 115200
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
printf "57600 bps.\n"
stty -F /dev/ttyAMA0 57600
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
printf "19200 bps.\n"
stty -F /dev/ttyAMA0 19200
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
printf "4800 bps.\n"
stty -F /dev/ttyAMA0 4800
printf "\$PMTK220,1000*1F\r\n" > /dev/ttyAMA0
printf "\$PMTK251,9600*17\r\n" > /dev/ttyAMA0
sleep 0.2
stty -F /dev/ttyAMA0 9600
printf "\$PMTK314,0,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n" > /dev/ttyAMA0
printf "MTK has been set to 9600 baud with RMC messages at 1 Hz.\n"
printf "Press ctrl-C to abort, or any other key enter to continue with setup.\n"
read
# Now start the Stratux setup.
printf "Sending MTK command to set GPS baud rate to 38400\n"
printf "\$PMTK251,38400*27\r\n" > /dev/ttyAMA0
printf "Setting RPi baud rate of /dev/ttyAMA0 to 38400\n"
stty -F /dev/ttyAMA0 38400
sleep 0.2
printf "Sending MTK command to configure NMEA message output\n"
printf "\$PMTK314,0,1,1,1,5,5,0,0,0,0,0,0,0,0,0,0,0,0,0*29\r\n" > /dev/ttyAMA0
sleep 0.2
printf "Sending MTK commands to enable WAAS\n"
printf "\$PMTK301,2*2E\r\n" > /dev/ttyAMA0
sleep 0.2
printf "\$PMTK513,1*28\r\n" > /dev/ttyAMA0
sleep 0.2
printf "Sending MTK commands to enable 5 Hz position reporting\n"
printf "\$PMTK220,200*2C\r\n" > /dev/ttyAMA0
# Finally, test the connection.
printf "Opening /dev/ttyAMA0 to listen to GPS. Press ctrl-C to cancel.\n"
cat /dev/ttyAMA0