rp: fix adc test flakiness

GP29 is connected to the cyw43 SCK pin. cyw43 is selected by
default (due to rp2040 pins being input/pulldown by default), so the
wifi chip is always selected and watches the SCK pin. this little bit of
load on the SCK pin is enough to disturb the 300k voltage divider used
for VSYS sensing, making the test flaky.

1 files changed, 3 insertions, 1 deletions

diff --git a/tests/rp/src/bin/adc.rs b/tests/rp/src/bin/adc.rs
index d6d58f0c0..b29a3a7cb 100644
--- a/tests/rp/src/bin/adc.rs
+++ b/tests/rp/src/bin/adc.rs
@@ -8,7 +8,7 @@ use defmt::*;
 use embassy_executor::Spawner;
 use embassy_rp::adc::{Adc, Channel, Config, InterruptHandler, Sample};
 use embassy_rp::bind_interrupts;
-use embassy_rp::gpio::Pull;
+use embassy_rp::gpio::{Level, Output, Pull};
 use {defmt_rtt as _, panic_probe as _};
 
 bind_interrupts!(struct Irqs {
@@ -18,6 +18,8 @@ bind_interrupts!(struct Irqs {
 #[embassy_executor::main]
 async fn main(_spawner: Spawner) {
     let mut p = embassy_rp::init(Default::default());
+    let _power_reg_pwm_mode = Output::new(p.PIN_23, Level::High);
+    let _wifi_off = Output::new(p.PIN_25, Level::High);
     let mut adc = Adc::new(p.ADC, Irqs, Config::default());
 
     {