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Forum Index : Microcontroller and PC projects : Micromite MX270 v5.03.02

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kiiid

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Joined: 11/05/2013
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Posts: 671
Posted: 11:32pm 16 Feb 2017
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With Geoff's approval presenting MMBasic v5.03.02 running on 44-pin MX270 chip with USB. This version is very similar to the MX170 version, but supports direct USB communication and has three serial ports available in Basic, instead of two. I needed it as part of a specific project, but figured it might be useful to many more people as it saves the external USB bridge in small projects, hence the release.

2017-02-17_092839_Micromite-MX270D.X.production.zip

In addition to COM1 and COM2, COM4 is also available now like in MM+, and like it again it is shared with the console UART (although available on different pins), so in order to enable COM4 the console should be disabled with OPTION CONSOLE OFF. The USB console is always available, though.

The speed is also quite good - 1180 grains at 48MHz with active USB console.

In order to make USB functional a crystal is needed, 8MHz in this case. That plus the two pins taken by the USB itself required small reordering of the pinout but it is minimal. Here is the pinout for the 44-pin MX270D chip:

(Micromite MX270D) Pinout for 44-pin:
1 : 5V | DIGITAL | COUNT | I2C DATA
2 : 5V | DIGITAL | PWM 2B
3 : 5V | DIGITAL | INT4
4 : 5V | DIGITAL
5 : 5V | DIGITAL
6 : GND
7 : CAP
8 : USB D+
9 : USB D-
10: Vusb
11: DIGITAL | ANALOG | COM2-RX
12: 5V | DIGITAL | COM2-TX
13: 5V | DIGITAL
14: DIGITAL | ANALOG | SPI CLOCK
15: DIGITAL | ANALOG | PWM 2A
16: GND (AVss)
17: 3.3V (AVdd)
18: RESET
19: DIGITAL | ANALOG
20: DIGITAL | ANALOG | SPI OUT (MOSI)
21: DIGITAL | ANALOG | PWM 1A
22: DIGITAL | ANALOG | PWM 1B
23: DIGITAL | ANALOG | COM4-RX (shared with the console)
24: DIGITAL | ANALOG | COM4-TX (shared with the console)
25: DIGITAL | ANALOG
26: DIGITAL | ANALOG | PWM 1C
27: DIGITAL | ANALOG | COM1-TX
28: 3.3V
29: GND
30: OSC1 8MHz
31: OSC2 8MHz
32: 5V | DIGITAL | COM1-RX
33: CONSOLE Tx (DATA OUT)
34: CONSOLE Rx (DATA IN)
35: 5V | DIGITAL | INT3
36: DIGITAL | ANALOG | INT2
37: 5V | DIGITAL | INT1
38: 5V | DIGITAL | COM1: ENABLE
39: GND
40: 3.3V
41: 5V | DIGITAL | SPI IN (MISO)
42: 5V | Vbus
43: 5V | DIGITAL | COUNT | WAKEUP | IR
44: 5V | DIGITAL | COUNT | I2C CLOCK

http://rittle.org

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sagt3k

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Joined: 01/02/2015
Location: Italy
Posts: 313
Posted: 10:07am 17 Feb 2017
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Hey kiiid

.... very interesting. A small micromite with usb.
I'll try to test it right away.
Thanks
sagt3k
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 06:23pm 17 Feb 2017
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Any change of a version that runs on a 28 pin mx270?
Microblocks. Build with logic.
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 10:36pm 17 Feb 2017
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Possibly yes, soon.

If anyone is trying the current 44-pin version, and come across bugs, please let me know.Edited by kiiid 2017-02-19
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kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 11:51pm 17 Feb 2017
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Update to fix a small bug in the handling of pins 19 and 20.

2017-02-18_094936_Micromite-MX270D.X.production.hex.zip



http://rittle.org

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kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 03:02am 19 Feb 2017
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In case anyone is interested in the MX270 version, releasing here the gerbers for probably the simplest development board for it. I have no plans to manufacture and sell any of these but they can be easily assembled by hand at home.

All components are 1206 or similar size for easy manual assembly. PCB size is 77x37.5mm.

2017-02-19_130143_MX2.zip


http://rittle.org

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jwaldha
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Joined: 14/01/2016
Location: Hungary
Posts: 10
Posted: 01:19am 20 Feb 2017
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One more vote for 28 pin mx270 !
---
JWaldha
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 01:44am 20 Feb 2017
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  jwaldha said   One more vote for 28 pin mx270 !


I am not planning any work on that at the moment since there is no need for it in my development process, but hopefully Geoff may decide to release a 28-pin version based on the sources of the 44-pin version. Sure there will be room for its application.

http://rittle.org

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jwaldha
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Joined: 14/01/2016
Location: Hungary
Posts: 10
Posted: 01:59am 20 Feb 2017
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  kiiid said  
  jwaldha said   One more vote for 28 pin mx270 !


I am not planning any work on that at the moment since there is no need for it in my development process, but hopefully Geoff may decide to release a 28-pin version based on the sources of the 44-pin version. Sure there will be room for its application.



If I was able to access the source code, maybe I could do the modification.
---
JWaldha
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 02:08am 20 Feb 2017
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  jwaldha said  
  kiiid said  
  jwaldha said   One more vote for 28 pin mx270 !


I am not planning any work on that at the moment since there is no need for it in my development process, but hopefully Geoff may decide to release a 28-pin version based on the sources of the 44-pin version. Sure there will be room for its application.



If I was able to access the source code, maybe I could do the modification.


You will need to discuss that with Geoff. I am ok if he provides the sources for the 44-pin version to you.
Edited by kiiid 2017-02-21
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jwaldha
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Location: Hungary
Posts: 10
Posted: 10:35pm 03 Apr 2017
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Here is the hex file for 28 pin version (PIC32MX270F256B).
(With Geoff's approval)

2017-04-04_081919_MX270B.X.production.zip

For testing I used a CHIPKIT DP32 board. (Ofcourse I replaced the MX250 chip to the MX270.)
If you have a hw related question, please refer to the documentation of this board.
ChipkitDP32

The original documentation is valid in the following exceptions:
The following pins they have lost the original functions:

9, 10 Connect here the 8MHz crystal (and two neccessary capacitors based on the datasheet of the crystal)
23 Connect this pin to the 3V3 (eg. pin13)
15 Connect this pin the 5V comes from USB connector
21 Connect this pin to the D+ signal on the USB connector
22 Connect this pin to the D- signal on the USB connector

According the MM+ documentation, the serial console can turn off/on:
  Quote  
Serial Console
This is the traditional method of communicating with a Micromite and it is turned on by default when the
Micromite firmware is programmed into the chip.
The default baud rate is 38400 and the performance of the editor and the speed of displaying text can be
improved considerably by selecting a higher baud rate (see the OPTION BAUDRATE command in the
"Micromite Manual").
If the serial console is not required it can be disabled. This allows the two I/O pins previously used by the
console to be used as general I/O pins or as a fourth serial port (COM4:). The command to disable the serial
console is:
OPTION CONSOLE OFF
If you want to re-enable the serial console you can do so with the command OPTION CONSOLE ON.



The current pinmap:
1 - RESET
2 - DIGITAL | ANALOG
3 - SPI OUT | DIGITAL | ANALOG
4 - PWM 1A | DIGITAL | ANALOG
5 - PWM 1B | DIGITAL | ANALOG
6 - PWM 1C | DIGITAL | ANALOG
7 - DIGITAL | ANALOG
8 - GROUND
9 - 8MHz crystal wasted: COM2:TRANSMIT | DIGITAL
10 - 8MHz crystal wasted: COM2: RECEIVE | DIGITAL
11 - CONSOLE Tx (DATA OUT) | COM4 Tx | DIGITAL
12 - CONSOLE Rx (DATA IN) | COM4 Rx | DIGITAL
13 - POWER (+2.3 to +3.6V)
14 - SPI IN | 5V | DIGITAL
15 - VBUS wasted: DIGITAL | 5V | COUNT
16 - DIGITAL | 5V | COUNT | WAKEUP | IR
17 - DIGITAL | 5V | COUNT | I2C CLOCK
18 - DIGITAL | 5V | COUNT | I2C DATA
19 - GROUND
20 - 47uF TANT CAPACITOR (+)
21 - USB D+ wasted: DIGITAL | 5V | COM1: TRANSMIT
22 - USB D- wasted: DIGITAL | 5V | COM1: RECEIVE
23 - VUSB3V3 wasted: ANALOG | DIGITAL
24 - ANALOG | DIGITAL | PWM 2B
25 - ANALOG | DIGITAL | SPI CLOCK
26 - ANALOG | DIGITAL | PWM 2A
27 - ANALOG GROUND
28 - ANALOG POWER (+2.3 to +3.6V)
Edited by jwaldha 2017-04-05
---
JWaldha
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 09:35am 04 Apr 2017
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This is great! I hope a 28-pin USB version might be useful to some people. I believe this is based on the 44-pin version released by me earlier, which means nice working power saving modes for battery operated devices.

Only one suggestion - COM2 is software UART, so it is probably worth moving it over to another pair of pins to increase the overall functionality. I would suggest pins 6 and 7 (sacrificing PWM1C when COM2 is used)
Edited by kiiid 2017-04-05
http://rittle.org

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jman

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Joined: 12/06/2011
Location: New Zealand
Posts: 711
Posted: 09:38am 04 Apr 2017
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Hi
Thanks for this kiiid and jwaldha (for the 28 pin version)
Time to spin up a 28pin version. This will be great for projects where the pin usage is not a concern.

Regards
Jman
 
Zonker

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Joined: 18/08/2012
Location: United States
Posts: 761
Posted: 11:00am 04 Apr 2017
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Wow..!!

Thanks, Gents... This 28 pinner (and 44) USB firmware is a good addition (imho)

All the source code gurus deserve a big "tip of the hat"

 
jwaldha
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Joined: 14/01/2016
Location: Hungary
Posts: 10
Posted: 07:03am 05 Apr 2017
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  kiiid said   Only one suggestion - COM2 is software UART, so it is probably worth moving it over to another pair of pins to increase the overall functionality. I would suggest pins 6 and 7 (sacrificing PWM1C when COM2 is used)


Here is the solution.

2017-04-05_170013_MX270B.X.production.zip

I corrected the pin allocation for COM2. (COM2_TX: pin6, COM2_RX: pin7)

A little bonus:
You can freely select pins for COM2!
To do all that is required to create two integer variables: COM2_RX_PIN and COM2_TX_PIN.
If these variables are exist and contains valid (and free) pin numbers when execute the [OPEN "COM2:xxx"] command then this pins will be used.
If these variables are exist, but not contains valid (and free) pin numbers, then You get an error message.
If these variables are not exist, then the new defaults (6,7) will be used.
These pins will be exclusively allocated for COM2 until you close the COM2.
The allocated pins will be released again after You close the COM2.


---
JWaldha
 
isochronic
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Joined: 21/01/2012
Location: Australia
Posts: 689
Posted: 05:27pm 05 Apr 2017
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Is the memory available decreased (ie because of the usb stack) ?
 
kiiid

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Joined: 11/05/2013
Location: United Kingdom
Posts: 671
Posted: 08:15pm 05 Apr 2017
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http://rittle.org

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sagt3k

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Joined: 01/02/2015
Location: Italy
Posts: 313
Posted: 10:20pm 05 May 2017
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Hi jwaldha

Concerning 28pin version PIC32MX270F256B, Could you make a quick summary of pin used definitively?
Thanks
sagt3k
 
jwaldha
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Joined: 14/01/2016
Location: Hungary
Posts: 10
Posted: 12:08am 07 May 2017
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  sagt3k said   Hi jwaldha

Concerning 28pin version PIC32MX270F256B, Could you make a quick summary of pin used definitively?
Thanks
sagt3k


Hi, Antonio

The current default pinmap of MX270USB:

1 - RESET
2 - DIGITAL | ANALOG
3 - SPI OUT | DIGITAL | ANALOG
4 - PWM 1A | DIGITAL | ANALOG
5 - PWM 1B | DIGITAL | ANALOG
6 - PWM 1C | DIGITAL | ANALOG | COM2 Tx
7 - DIGITAL | ANALOG | COM2 Rx
8 - GROUND
9 - 8MHz crystal
10 - 8MHz crystal
11 - CONSOLE Tx (DATA OUT) | COM4 Tx | DIGITAL
12 - CONSOLE Rx (DATA IN) | COM4 Rx | DIGITAL
13 - POWER (+2.3 to +3.6V)
14 - SPI IN | 5V | DIGITAL
15 - VBUS
16 - DIGITAL | 5V | COUNT | WAKEUP | IR
17 - DIGITAL | 5V | COUNT | I2C CLOCK
18 - DIGITAL | 5V | COUNT | I2C DATA
19 - GROUND
20 - 47uF TANT CAPACITOR (+)
21 - USB D+
22 - USB D-
23 - VUSB3V3
24 - ANALOG | DIGITAL | PWM 2B
25 - ANALOG | DIGITAL | SPI CLOCK
26 - ANALOG | DIGITAL | PWM 2A
27 - ANALOG GROUND
28 - ANALOG POWER (+2.3 to +3.6V)



Since the COM2 is implemented in software,
it is make to possible to use any free I/O pin
for COM2 Rx and Tx functionality.
This solution is use these technique:

To do all that is required to create two integer variables:
COM2_RX_PIN and COM2_TX_PIN.
If these variables are exist and contains
valid (and free) pin numbers when execute the [OPEN "COM2:xxx"]
command then this pins will be used.
If these variables are exist, but not contains valid (and free) pin numbers,
then You get an error message.
If these variables are not exist, then the new defaults (6,7) will be used.
These pins will be exclusively allocated for COM2 until
you close the COM2.
The allocated pins will be released again after You close the COM2.



Some examples:
The serial data received on pin 24 and serial data transmitted on pin 25.


Pins 24, 25 are free:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
Open "COM2:4800" As #2
Close #2
>
> run
>


Pin 24 is not free, beacuse allocated for DigitalOutput:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
SetPin 24, dout
Open "COM2:4800" As #2
Close #2
> run
[6] Open "COM2:4800" As #2
Error: Pin 24 is in use
>



Same as above, but pin 24 is released with "SetPin 24, off" command:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
SetPin 24, dout
SetPin 24, off
Open "COM2:4800" As #2
Close #2
> run
>
[/code]

Pin 24 is not free, beacuse allocated by "PWM 2, 1000, 10, 10" command:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
PWM 2, 1000, 10, 10
Open "COM2:4800" As #2
Close #2
> run
[6] Open "COM2:4800" As #2
Error: Pin 24 is in use
>


Same as above, but pin 24 is released with "PWM 2, stop" command:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
PWM 2, 1000, 10, 10
PWM 2, stop
Open "COM2:4800" As #2
Close #2
>
>
> run
>




Pin 24 is allocated for COM2 Rx.

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
Open "COM2:4800" As #2
SetPin 24, dout
Close #2
> run
[6] SetPin 24, dout
Error: Pin 24 is in use


Same as above, but pin 24 is released with "Close #2" command:

> list
Dim COM2_RX_PIN As integer
Dim COM2_TX_PIN As integer
COM2_RX_PIN = 24
COM2_TX_PIN = 25
Open "COM2:4800" As #2
Close #2
SetPin 24, dout
> run
>



I hope I could help you!

Regards,
Janos
---
JWaldha
 
sagt3k

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Joined: 01/02/2015
Location: Italy
Posts: 313
Posted: 05:47am 07 May 2017
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Hi Janos
Thanks ... Excellent, exactly what I had asked and above all with the examples.
Some questions:
1) Given the features of moving the COM2 on others pins (COM2 sw), Can We also have the firmware for the 44pin?
2) Do you think keep this code aligned with Geoff's features in future ? Obviously with the approval of Geoff and guru of project.
Thanks
sagt3k
 
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