GPIO interrupts not recognized on RP2350 (Pico 2) #4689
Description
I have written a simple program that should recognize edges on an input and trigger an interrupt. The interrupt doesn't happen.
Here is the simple program:
package main
import (
"fmt"
"machine"
"time"
)
func bcast(x bool) int {
if x {
return 1
} else {
return 0
}
}
func main() {
// square wave is fed to pin 10
p := machine.Pin(10)
p.Configure(machine.PinConfig{Mode: machine.PinInputPullup})
// and should be echoed to pin 11
q := machine.Pin(11)
q.Configure(machine.PinConfig{Mode: machine.PinOutput})
err := p.SetInterrupt(machine.PinRising, func(pin machine.Pin) {
fmt.Printf("verify pin: %d\n", pin)
fmt.Printf("interrupt: %d, %d\n", bcast(p.Get()), bcast(pin.Get()))
q.Set(p.Get())
})
if err != nil {
fmt.Printf("err set interrupt: %s\n", err.Error())
panic(err.Error())
} else {
fmt.Printf("set interrupt ok\n")
}
for i := 0; i < 300; i++ {
fmt.Printf("tick %d, pin=%d\n", i, bcast(p.Get()))
time.Sleep(1 * time.Second)
}
}And here is the output when run on a Pico2. The main loop runs fine and the pin is clearly changing state but the interrupt is not recognized.
I suspect that there is something about the RP2350 that requires a slight additional bit of work in order to enable the control of interrupts. It may have to do with the newly introduced security model.
I don't have a 2040 based Pico to test on right now so I can't confirm this works on the RP2040
tinygo flash -target=pico2 -scheduler=tasks -gc=conservative -size=full -stack-size=20kb -monitor IrqBug/main.go
code rodata data bss | flash ram | package
------------------------------- | --------------- | -------
0 45 3 5 | 48 8 | (padding)
1560 0 10 45 | 1570 55 | (unknown)
1220 0 0 0 | 1220 0 | C compiler-rt-builtins
0 248 0 0 | 248 0 | C interrupt vector
76 0 0 0 | 76 0 | C picolibc
0 0 0 2048 | 0 2048 | C stack
160 0 0 0 | 160 0 | Go interface assert
292 0 0 0 | 292 0 | Go interface method
0 1148 0 0 | 1148 0 | Go types
96 0 0 0 | 96 0 | device/arm
68 0 0 0 | 68 0 | device/rp
6 0 0 0 | 6 0 | errors
8286 216 0 0 | 8502 0 | fmt
14 0 0 0 | 14 0 | internal/binary
1136 21 0 0 | 1157 0 | internal/fmtsort
132 2 0 0 | 134 0 | internal/itoa
0 19 8 0 | 27 8 | internal/oserror
338 48 4 4 | 390 8 | internal/task
46 2 0 0 | 48 0 | io/fs
1662 159 8 1082 | 1829 1090 | machine
400 0 0 7 | 400 7 | machine/usb/cdc
0 0 93 0 | 93 93 | machine/usb/descriptor
440 88 0 0 | 528 0 | main
134 0 0 0 | 134 0 | math/bits
160 39 32 0 | 231 32 | os
4826 773 48 0 | 5647 48 | reflect
4350 722 4 753 | 5076 757 | runtime
792 0 0 0 | 792 0 | runtime/volatile
510 0 0 0 | 510 0 | sort
7632 16012 1338 0 | 24982 1338 | strconv
76 0 0 0 | 76 0 | sync
32 6 0 0 | 38 0 | syscall
1036 288 0 0 | 1324 0 | unicode/utf8
------------------------------- | --------------- | -------
35480 19836 1548 3944 | 56864 5492 | total
Connected to /dev/cu.usbmodem14101. Press Ctrl-C to exit.
tick 1, pin=0
tick 2, pin=0
tick 3, pin=0
tick 4, pin=0
tick 5, pin=0
tick 6, pin=0
tick 7, pin=0
tick 8, pin=0
tick 9, pin=0
tick 10, pin=1
tick 11, pin=1
tick 12, pin=1
tick 13, pin=1
tick 14, pin=0
tick 15, pin=0
tick 16, pin=0
tick 17, pin=1
tick 18, pin=0
tick 19, pin=0