How to use the Blink_1Hz program in a clock program - irq

Question

I want to use the RPi Pico to build a clock.
In the documentation I found "blink_1hz.py" and I want to use the
1 second interrupt as counter for my clock.
The original program prints the system time every second correctly.
I only replaced the call to the lambda function in the irq by my own seconds counter function.
My problem is:
My version the of program prints only once instead of ten times, and does not increment t
I looked all over the internet but there is little specific information about the interrupts used by the StateMachines.
All suggestions are welcome
Here is my code:
# Example using PIO to blink an LED and raise an IRQ at 1Hz.
import time
from machine import Pin
import rp2
#rp2.asm_pio(set_init=rp2.PIO.OUT_LOW)
def blink_1hz():
# Cycles: 1 + 1 + 6 + 32 * (30 + 1) = 1000
irq(rel(0))
set(pins, 1)
set(x, 31) [5]
label("delay_high")
nop() [29]
jmp(x_dec, "delay_high")
# Cycles: 1 + 7 + 32 * (30 + 1) = 1000
set(pins, 0)
set(x, 31) [6]
label("delay_low")
nop() [29]
jmp(x_dec, "delay_low")
def secs():
global t
t = t+1
print("secs",t)
t = 0
# Create the StateMachine with the blink_1hz program, outputting on Pin(25).
sm = rp2.StateMachine(0, blink_1hz, freq=2000, set_base=Pin(25))
# Set the IRQ handler to print the millisecond timestamp.
sm.irq(handler = secs()) # prints secs only once
#sm.irq(lambda p: print( time.ticks_ms())) # original, prints ticks every second
# Start the StateMachine.
sm.active(1)
time.sleep(10)
# Stop the StateMachine
sm.active(0)
p rint("main",t)