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Volhout
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Posted: 11:28am 18 Aug 2025

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Peter,

When using the PIO PROGRAM LINE command, you cannot start a program at line 0.
This used to work in 6.00.01, and stopped working in 6.00.02.

Relevant Post

Any reason why ? If this is purposely, then we need to adapt the user manual change the examples.

EDIT: using 6.00.03
When using PIO1, you can not start on line 0. Line 1 works though.
This is also the case with the other way of programming, programming through an array.

Examples:

This does NOT work

'CpuSpeed 126000

SETPIN GP0,PIO1

'program pio1
pio program line 1,0,&hE081
pio program line 1,1,&hE101
pio program line 1,2,&hE000
pio program line 1,3,&h0001

'program pio 1 using an array to write the program in PIO memory, and start
'Dim a%(7)=(&h0001E000E001E081,0,0,0,0,0,0,0)
'PIO program 1,a%()

'configure pio1
p=Pio(pinctrl 0,1,,,,gp0,)
f=2000 'Hz
PIO init machine 1,0,f,p,,,0

PIO start 1,0

But then...this works...

'CpuSpeed 126000

SETPIN GP0,PIO1

'program pio1
pio program line 1,1,&hE081 'start at line 1
pio program line 1,2,&hE101
pio program line 1,3,&hE000
pio program line 1,4,&h0002

'program pio 1 using an array to write the program in PIO memory, and start
'Dim a%(7)=(&h0001E000E001E081,0,0,0,0,0,0,0)
'PIO program 1,a%()

'configure pio1
p=Pio(pinctrl 0,1,,,,gp0,)
f=2000 'Hz
PIO init machine 1,0,f,p,,,1 'start at line 1

PIO start 1,0

It is not related to GP0, on GP4 the behavior is the same.

EDIT:EDIT: the behaviour on PIO0 is the same (now) as PIO1, I must have been confused earlier that it worked correct on PIO0.

Volhout
Edited 2025-08-18 22:11 by Volhout

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matherp
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Posted: 12:12pm 18 Aug 2025

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What about using the inbuilt assembler?

Volhout
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Posted: 01:07pm 18 Aug 2025

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Same when using the onboard assembler.

Line 0 as starting point does not work, line 1 does work.

pio clear 1
SETPIN GP0,PIO1

'program pio1
pio assemble 1,".program test"
pio assemble 1,".line 1" 'does not work with line 0
pio assemble 1,"set pindirs,1"
pio assemble 1,"label:"
pio assemble 1,"set pins,1 [1]"
pio assemble 1,"set pins,0"
pio assemble 1,"jmp label"
pio assemble 1,".end program list"

'pio program line 1,0,&hE081
'pio program line 1,1,&hE101
'pio program line 1,2,&hE000
'pio program line 1,3,&h0001

'program pio 1 using an array to write the program in PIO memory, and start
'Dim a%(7)=(&h0001E000E001E081,0,0,0,0,0,0,0)
'PIO program 1,a%()

'configure pio1
p=Pio(pinctrl 0,1,,,,gp0,)
f=4000 'Hz
PIO init machine 1,0,f,p,,,1 'does not work with line 0

PIO start 1,0

Volhout

P.S. you have to check this with a scope, or buzzer, not with a LED. A previous run could leave the PIO output register for GP0 is state "1", and the new run could light a LED attached. As if it works, but the program should output a tone. Not a static high level.
Edited 2025-08-18 23:10 by Volhout

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Volhout
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Posted: 01:21pm 18 Aug 2025

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pio clear 1
SETPIN GP0,PIO1

'program pio1
pio assemble 1,".program test"
.line 1
set pindirs,1
.label lbl
set pins,1 [1]
set pins,0
jmp lbl
.end program list

'pio program line 1,0,&hE081
'pio program line 1,1,&hE101
'pio program line 1,2,&hE000
'pio program line 1,3,&h0001

'program pio 1 using an array to write the program in PIO memory, and start
'Dim a%(7)=(&h0001E000E001E081,0,0,0,0,0,0,0)
'PIO program 1,a%()

'configure pio1
p=Pio(pinctrl 0,1,,,,gp0,)
f=4000 'Hz
PIO init machine 1,0,f,p,,,1 'does not work with line 0

PIO start 1,0

Same for this version of the assembler.

Volhout

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matherp
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Posted: 02:50pm 18 Aug 2025

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I've tracked it down to a change in the sdk added to support the RP2350B. There is another control variable (PINHI) which the sdk creates when you call the routines to load the config.
PIO init machine does not do anything with this but just substitutes the user supplied values of PINCTRL etc. PINHI is a sdk internal value that I don't know how to create but magically changes when you call the sdk routines to load the config/

The program works if you substitute

PIO Configure 1, 0, 4000, 0,,,,gp0,1

for

PIO init machine 1,0,f,p,,,0

because the newer configure mechanism does everything properly

I've been testing on a RP2350
Please confirm on an RP2040

init machine give PINHI of 0xFFFFFFFF, configure gives 0xFFF07C1F
Why this works with a start line of other than 0 - who knows

Volhout
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Posted: 03:21pm 18 Aug 2025

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Ok, you are confused, so am I. What do you suggest as the way forward. Talk to RP about the SDK? Depricate PIO INIT MACHINE? Then we need to adapt the manuals, since they currently confuse.

Volhout
Edited 2025-08-19 01:23 by Volhout

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matherp
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Posted: 06:03pm 18 Aug 2025

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I've done more research and it appears the later sdk have changed the defaults for execctrl and shiftctrl. The PINHI thing may be a red herring and only relate to pins above gp29 for the rp2350. I'll try and generate a version that restores the defaults that were in the earlier versions - watch this space.

stanleyella

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Posted: 12:27am 19 Aug 2025

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I added usc to ttl so I could usb pico version and added the sound filter,
all works, audio from sd card.

PicoMite MMBasic USB RP2350A Edition V6.01.00b8
OPTION SERIAL CONSOLE COM2,GP8,GP9
OPTION SYSTEM SPI GP18,GP19,GP16
OPTION AUTORUN ON
OPTION FLASH SIZE 4194304
OPTION COLOURCODE ON
OPTION KEYBOARD UK
OPTION CPUSPEED (KHz) 378000
OPTION LCDPANEL ILI9341, LANDSCAPE,GP15,GP14,GP13
OPTION TOUCH GP12,GP11
GUI CALIBRATE 0, 3900, 3816, -887, -658
OPTION SDCARD GP22
OPTION AUDIO GP0,GP1', ON PWM CHANNEL 0

using pins in use
For m=0 To 28 :n= MM.Info(pinno "GP"+Str$(m)):print n,"GP"+Str$(m), MM.Info(pin n) :next

Sub MM.Startup
Local Integer m, n
For m=0 To 28
n = MM.Info(pinno "GP"+Str$(m))
If MM.Info(pin n)="OFF" Then SetPin n, DIN, PULLUP
Print n,"GP"+Str$(m), MM.Info(pin n)
Next
End Sub

I get
1 GP0 Boot Reserved : SSD RESET
2 GP1 Boot Reserved : AUDIO R
4 GP2 OFF
5 GP3 OFF
6 GP4 OFF
7 GP5 OFF
9 GP6 OFF
10 GP7 OFF
11 GP8 Boot Reserved : CONSOLE TX
12 GP9 Boot Reserved : CONSOLE RX
14 GP10 OFF
15 GP11 Boot Reserved : TOUCH IRQ
16 GP12 Boot Reserved : TOUCH CS
17 GP13 Boot Reserved : LCD CS
19 GP14 Boot Reserved : LCD Reset
20 GP15 Boot Reserved : LCD DC
21 GP16 Boot Reserved : SPI SYSTEM MISO
22 GP17 OFF
24 GP18 Boot Reserved : SPI SYSTEM CLK
25 GP19 Boot Reserved : SPI SYSTEM MOSI
26 GP20 OFF
27 GP21 OFF
29 GP22 Boot Reserved : SD CS
41 GP23 DOUT
42 GP24 DIN
43 GP25 HEARTBEAT
31 GP26 OFF
32 GP27 OFF
34 GP28 OFF
why GP0 Boot Reserved : SSD RESET not audio L ?

Volhout
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Posted: 08:43am 19 Aug 2025

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Hi Peter,

I understood that I2S audio uses PIO0. Correct ? All other audio systems do not use PIO.

Is below overview correct ?

Volhout

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matherp
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Posted: 10:30am 19 Aug 2025

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Only I2S uses PIO. RP2350 uses PIO2, RP2040 uses PIO0

matherp
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Posted: 11:04am 19 Aug 2025

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V6.01.00b9

Compensates for the sdk change in the way PIO structures are initialised

PicoMiteV6.01.00b9.zip

Mixtel90

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Posted: 11:18am 19 Aug 2025

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PIO2 isn't present on the RP2040 is it?

Mick

Zilog Inside! nascom.info for Nascom & Gemini
Preliminary MMBasic docs & my PCB designs

Volhout
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Posted: 12:03pm 19 Aug 2025

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@Peter,

I2S audio: on RP2350A also uses PIO2 ? Or only on RP2350B. On 2350, is VGA also in PIO2 then ?

About 6.01.00b9
- Runs OK on 2350B-VGA+PSRAM, tested several programs including logic analyzer, kept OPTIONS
- Runs OK on 2350A equipped Game*Mite (deleted OPTIONS at install)
- Runs OK on RP2040-GEEK (deleted OPIONS)
- Runs OK on 2040 PicoMite (kept OPTIONS)

Checked several PIO programs on 2040, and all work okay.

I will do some more testing tonight. Maybe this should replace the 60003 at Geoff's site.

I will update the overview on PIO usage.

Volhout
Edited 2025-08-19 22:12 by Volhout

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matherp
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Posted: 12:09pm 19 Aug 2025

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Quote PIO2 isn't present on the RP2040 is it?

No - RP2350 only

Quote I2S audio: on RP2350A also uses PIO2 ? Or only on RP2350B.

All RP2350
Edited 2025-08-19 22:10 by matherp

Volhout
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Posted: 12:50pm 19 Aug 2025

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Peter,

On 2040VGA PIO0 has both I2S and VGA combined.
On 2350VGA PIO2 combines I2S and VGA ? (or do they use separate PIO's) ?.

Volhout

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matherp
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Posted: 01:21pm 19 Aug 2025

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Quote On 2350VGA PIO2 combines I2S and VGA ? (or do they use separate PIO's) ?.

Separate, for some reason I couldn't get shared to work and in any case it makes it simpler to always use PIO2

Volhout
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Posted: 01:28pm 19 Aug 2025

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OK, then this should be correct.

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Volhout
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Posted: 05:56pm 19 Aug 2025

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@Peter,

Tested all in my possession on 2040VGA, and all work on b9.

Volhout

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matherp
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Posted: 05:59pm 19 Aug 2025

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Quote Tested all in my possession on 2040VGA, and all work on b9.

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