Merge branch 'rc-calibration' of

https://github.com/digitalentity/cleanflight into
digitalentity-rc-calibration

Conflicts:
	docs/Rx.md
	src/main/io/serial_cli.c
	src/main/rx/rx.c
	src/main/rx/rx.h

docs/Cli.md

@@ -92,6 +92,7 @@ Re-apply any new defaults as desired.
 | `play_sound`     | index, or none for next                        |
 | `profile`        | index (0 to 2)                                 |
 | `rateprofile`    | index (0 to 2)                                 |
+| `rccal`          | Set R/C channel calibration (stick end points) |
 | `save`           | save and reboot                                |
 | `set`            | name=value or blank or * for list              |
 | `status`         | show system status                             |

docs/Rx.md

@@ -206,7 +206,7 @@ Use the `input_filtering_mode` CLI setting to select a mode.
 | 0     | Disabled  |
 | 1     | Enabled   |
 
-## Receiver configuration
+## Receiver configuration.
 
 ### FrSky D4R-II
 
@@ -216,3 +216,36 @@ Set the RX for 'No Pulses'.  Turn OFF TX and RX, Turn ON RX.  Press and release
 
 Set failsafe on channels 1-4 set to OFF in the receiver settings (via transmitter menu).
 
+
+## Receiver Calibration.
+
+If you have a transmitter/receiver, that output a non-standard pulse range (i.e. 1070-1930 as some Spektrum receivers)
+you could use rc calibration to map actual range of your transmitter to 1000-2000 as expected by Cleanflight.
+
+To do this you should figure out what range your transmitter outputs and feed these values to rc calibration control.
+You can do this in a few simple steps:
+
+If you have used rc calibration previously you should reset it to prevent it from altering rc input. Do so
+by entering the following commands in CLI:
+```
+rccal 0 1000 2000
+rccal 1 1000 2000
+rccal 2 1000 2000
+rccal 3 1000 2000
+save
+```
+
+Now reboot your FC, connect the configurator, go to the `Receiver` tab move sticks on your transmitter and note min and
+max values of first 4 channels. Take caution as you can accidentally arm your craft. Best way is to move one channel at 
+a time.
+
+Go to CLI and set the min and max values with the following command:
+```
+rccal <channel_number> <min> <max>
+```
+
+For example, if you got 1070-1930 range for roll channel. Roll is `channel 0` so you should type `rccal 0 1070 1930` in
+the CLI. Be sure to enter the `save` command to save the settings.
+
+Use sub-trim on your transmitter to set the middle point of pitch, roll, yaw and throttle.
+

src/main/blackbox/blackbox.c

@@ -1388,4 +1388,4 @@ void initBlackbox(void)
     }
 }
 
-#endif
+#endif

src/main/config/config.c

@@ -414,6 +414,12 @@ static void resetConf(void)
     masterConfig.rxConfig.rssi_scale = RSSI_SCALE_DEFAULT;
     masterConfig.rxConfig.rssi_ppm_invert = 0;
 
+    // set default calibration to full range and 1:1 mapping
+	for (i = 0; i < MAX_CALIBRATED_RX_CHANNELS; i++) {
+        masterConfig.rxConfig.calibration[i].minrc = PWM_RANGE_MIN;
+        masterConfig.rxConfig.calibration[i].maxrc = PWM_RANGE_MAX;
+    }
+
     masterConfig.inputFilteringMode = INPUT_FILTERING_DISABLED;
 
     masterConfig.retarded_arm = 0;

src/main/io/serial.c

@@ -421,4 +421,3 @@ void evaluateOtherData(serialPort_t *serialPort, uint8_t receivedChar)
         systemResetToBootloader();
     }
 }
-

src/main/io/serial_cli.c

@@ -117,6 +117,7 @@ static void cliSet(char *cmdline);
 static void cliGet(char *cmdline);
 static void cliStatus(char *cmdline);
 static void cliVersion(char *cmdline);
+static void cliRxCalibration(char *cmdline);
 
 #ifdef GPS
 static void cliGpsPassthrough(char *cmdline);
@@ -258,6 +259,7 @@ const clicmd_t cmdTable[] = {
     CLI_COMMAND_DEF("rateprofile", "change rate profile",
         "[<index>]", cliRateProfile),
     CLI_COMMAND_DEF("rxfail", "show/set rx failsafe settings", NULL, cliRxFail),
+    CLI_COMMAND_DEF("rxcal", "rc calibration", NULL, cliRxCalibration),
     CLI_COMMAND_DEF("save", "save and reboot", NULL, cliSave),
     CLI_COMMAND_DEF("serial", "configure serial ports", NULL, cliSerial),
 #ifdef USE_SERVOS
@@ -927,6 +929,46 @@ static void cliMotorMix(char *cmdline)
 #endif
 }
 
+static void cliRxCalibration(char *cmdline)
+{
+    int i, check = 0;
+    char *ptr;
+
+    if (isEmpty(cmdline)) {
+        for (i = 0; i < MAX_CALIBRATED_RX_CHANNELS; i++) {
+            printf("rccal %u %u %u\r\n", i, masterConfig.rxConfig.calibration[i].minrc, masterConfig.rxConfig.calibration[i].maxrc);
+        }
+    } else {
+        ptr = cmdline;
+        i = atoi(ptr);
+        if (i >= 0 && i < MAX_CALIBRATED_RX_CHANNELS) {
+            int minrc, maxrc;
+            ptr = strchr(ptr, ' ');
+            if (ptr) {
+                minrc = atoi(++ptr);
+                check++;
+            }
+            ptr = strchr(ptr, ' ');
+            if (ptr) {
+                maxrc = atoi(++ptr);
+                check++;
+            }
+            if (check != 2) {
+                printf("Wrong number of arguments, needs idx min max\r\n");
+            }
+            else if (minrc < 750 || minrc > 2250 || maxrc < 750 || maxrc > 2250 || minrc >= maxrc) {
+                printf("Parameters error. Should be: 750 <= minrc < maxrc <= 2250\r\n");
+            }
+            else {
+                masterConfig.rxConfig.calibration[i].minrc = minrc;
+                masterConfig.rxConfig.calibration[i].maxrc = maxrc;
+            }
+        } else {
+            printf("Invalid R/C channel: must be > 0 and < %u\r\n", MAX_CALIBRATED_RX_CHANNELS);
+        }
+    }
+}
+
 #ifdef LED_STRIP
 static void cliLed(char *cmdline)
 {
@@ -1467,6 +1509,10 @@ static void cliDump(char *cmdline)
 
         cliAdjustmentRange("");
 
+        printf("\r\n# rccal\r\n");
+
+        cliRxCalibration("");
+
         cliPrint("\r\n# servo\r\n");
 
         cliServo("");

src/main/rx/rx.c

@@ -339,7 +339,20 @@ static uint16_t getRxfailValue(uint8_t channel)
 
 }
 
-static void processRxChannels(void)
+STATIC_UNIT_TESTED uint16_t applyRxCalibration(int sample, int minrc, int maxrc)
+{
+    // Check special condition sample = PPM_RCVR_TIMEOUT, allow no signal value to avoid being corrupted by calibration
+    if (sample == 0) {
+        return 0;
+    }
+
+    sample = scaleRange(sample, minrc, maxrc, PWM_RANGE_MIN, PWM_RANGE_MAX); 
+    sample = MIN(MAX(PWM_PULSE_MIN, sample), PWM_PULSE_MAX);
+
+    return sample;
+}
+
+void processRxChannels(void)
 {
     uint8_t chan;
 
@@ -361,6 +374,11 @@ static void processRxChannels(void)
         // sample the channel
         uint16_t sample = rcReadRawFunc(&rxRuntimeConfig, rawChannel);
 
+        // apply the rx calibration
+        if (chan < MAX_CALIBRATED_RX_CHANNELS) {
+            sample = applyRxCalibration(sample, rxConfig->calibration[chan].minrc, rxConfig->calibration[chan].maxrc);
+        }
+
         rxUpdateFlightChannelStatus(chan, sample);
 
         if (sample < rxConfig->rx_min_usec || sample > rxConfig->rx_max_usec || !rxSignalReceived) {

src/main/rx/rx.h

@@ -76,6 +76,7 @@ extern const char rcChannelLetters[];
 extern int16_t rcData[MAX_SUPPORTED_RC_CHANNEL_COUNT];       // interval [1000;2000]
 
 #define MAX_MAPPABLE_RX_INPUTS 8
+#define MAX_CALIBRATED_RX_CHANNELS      NON_AUX_CHANNEL_COUNT
 
 #define RSSI_SCALE_MIN 1
 #define RSSI_SCALE_MAX 255
@@ -91,6 +92,11 @@ typedef struct rxFailsafeChannelConfiguration_s {
     uint8_t step;
 } rxFailsafeChannelConfiguration_t;
 
+typedef struct rxCalibration_s {
+    uint16_t minrc;
+    uint16_t maxrc;
+} rxCalibration_t;
+
 typedef struct rxConfig_s {
     uint8_t rcmap[MAX_MAPPABLE_RX_INPUTS];  // mapping of radio channels to internal RPYTA+ order
     uint8_t serialrx_provider;              // type of UART-based receiver (0 = spek 10, 1 = spek 11, 2 = sbus). Must be enabled by FEATURE_RX_SERIAL first.
@@ -106,6 +112,7 @@ typedef struct rxConfig_s {
     uint16_t rx_max_usec;
     rxFailsafeChannelConfiguration_t failsafe_aux_channel_configurations[MAX_AUX_CHANNEL_COUNT];
 
+    rxCalibration_t calibration[MAX_CALIBRATED_RX_CHANNELS];
 } rxConfig_t;
 
 #define REMAPPABLE_CHANNEL_COUNT (sizeof(((rxConfig_t *)0)->rcmap) / sizeof(((rxConfig_t *)0)->rcmap[0]))

src/test/unit/platform.h

@@ -45,4 +45,3 @@ typedef struct
 } TIM_TypeDef;
 
 typedef enum {DISABLE = 0, ENABLE = !DISABLE} FunctionalState;
-