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AP_RSSI: handle init ordering with MSP

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this fixes a nullptr dereference on startup when MSP asks for RSSI
data before the RSSI library is initialised

Fixes #15824
This commit is contained in:
Andrew Tridgell 2020-11-17 08:40:45 +11:00
parent 248ef92ed7
commit 5385f25868
1 changed files with 3 additions and 0 deletions
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3
libraries/AP_RSSI/AP_RSSI.cpp
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@ -167,6 +167,9 @@ uint8_t AP_RSSI::read_receiver_rssi_uint8()
// read the RSSI value from an analog pin - returns float in range 0.0 to 1.0 // read the RSSI value from an analog pin - returns float in range 0.0 to 1.0
float AP_RSSI::read_pin_rssi() float AP_RSSI::read_pin_rssi()
{ {
if (!rssi_analog_source) {
return 0;
}
rssi_analog_source->set_pin(rssi_analog_pin); rssi_analog_source->set_pin(rssi_analog_pin);
float current_analog_voltage = rssi_analog_source->voltage_average(); float current_analog_voltage = rssi_analog_source->voltage_average();