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atbetaflight/docs/Rssi.md

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Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
# RSSI
RSSI is a measurement of signal strength. RSSI is very handy so you know when you are going out of range or there is interference.
Some receivers have RSSI outputs. 3 types are supported.
1. RSSI via PPM channel
2. RSSI via Parallel PWM channel
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
3. RSSI via ADC with PPM RC that has an RSSI output - aka RSSI ADC
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
## RSSI via PPM
Configure your receiver to output RSSI on a spare channel, then select the channel used via the cli.
e.g. if you used channel 1 then you would set:
```
set rssi_channel = 1
```
## RSSI via Parallel PWM channel
Connect the RSSI signal to any PWM input channel then set the RSSI channel as you would for RSSI via PPM
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
## RSSI ADC
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
Connect the RSSI signal to the RC2/CH2 input. The signal must be between 0v and 3.3v to indicate between 0% and 100% RSSI.
Use inline resistors to lower voltage if required, inline smoothing capacitors may also help.
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
FrSky D4R-II and X8R supported.
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
Enable using the RSSI_ADC feature:
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
```
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
feature RSSI_ADC
Add RSSI PWM on CH2 input. Also support FrSky 1khz RSSI. See documentation also added in this commit. This commit also cleans up the PWM mapping code. 'mask' didn't need to be a mask and it wasn't possible to add another 'type' since there were only 4 possible values when it was a mask and they were already defined. Combined with switching to using 16 bits instead of 8 for the mapping configurations, it's now possible to have 256 types instead of 4 at the expense of a few bytes of flash. Moved the RSSI calculation into rx_common.c, previously it was in the main loop.
2014-05-23 15:57:32 -07:00
```
Replace PWM RSSI with ADC RSSI. The primary reason is to support the D4R-II with it's much faster PWM frequency. The PWM RSSI code could not keep up, and since there are no timers free for using capture compare of PWM signals in hardware one solution is to use the ADC at a slow sample rate. RC2 is used as before and it expects a signal between 0 and 3.3v. An inline smoothing capacitor may help. This commit also removes the cli command adc_power_channel since the reading was never actually exposed anywhere.
2014-05-27 19:19:10 -07:00
The feature can not be used when RX_PARALLEL_PWM is enabled.