use auto-push to reduce size of PIO program

firmware/rust1/src/bin/heizung.rs

@@ -316,9 +316,7 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
         // Send zero to RX FIFO to signal start of next measurement.
         ".wrap_target",
         "timeout:",
-        "set x, 0",
-        "mov isr, x",
-        "push",
+        "in null, 32",
 
         // Wait for pin to be high for a longer time (UART is idle), copy waiting time to X
         // and decrement until done, start again when pin changes.
@@ -350,8 +348,7 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
         "jmp x-- measure_low",
         "jmp timeout",
         "changed_to_one:",
-        "mov isr, x"
-        "push",
+        "in x, 32"
 
         // Start counting, again, but for a high pulse.
         "mov x, osr",
@@ -362,8 +359,7 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
         "jmp x-- measure_high",
         "jmp timeout",
         "changed_to_low:",
-        "mov isr, x"
-        "push",
+        "in x, 32",
         "jmp y-- measure_next",
 
         // We are done.
@@ -378,7 +374,7 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
     const SM_FREQ: u32 = 125_000_000;
     cfg.clock_divider = (U56F8!(125_000_000) / U56F8!(125_000_000 /* SM_FREQ */)).to_fixed();
     cfg.shift_in = ShiftConfig {
-        auto_fill: false,
+        auto_fill: true,
         threshold: 32,
         direction: ShiftDirection::Left,
     };
@@ -404,7 +400,8 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
     unsafe { common.free_instr(loaded_program.used_memory); };
     sm.set_enable(false);
     let relocated = RelocatedProgram::new(&prg.program);
-    cfg.use_program(&common.load_program(&relocated), &[]);
+    let loaded_program = common.load_program(&relocated);
+    cfg.use_program(&loaded_program, &[]);
     cfg.fifo_join = FifoJoin::RxOnly;
     sm.set_config(&cfg);
     sm.set_enable(true);
@@ -415,6 +412,8 @@ async fn autobaud_task(pio0: embassy_rp::peripherals::PIO0, rx_pin: embassy_rp::
         pin_io(&rx_pin).ctrl().write(|w| w.set_funcsel(embassy_rp::pac::io::vals::Gpio17ctrlFuncsel::UART0_RX.0));
     }
 
+    info!("Program size for auto-baud: {}", prg.program.code.len());
+
     let mut dma_in_ref = dma_channel.into_ref();
     let mut din = [42u32; 9];
     let mut bit_index = 0;