PiPicoMite01 Rev 1 Connectors

Connectors

• PiPicoMite01 Rev 1 connectors are in a different order than later PiPicoMite01 revs
• The rev is marked on the rear of the card

J1 - MCP23017 - I2C Interrupt

• Useful for interrupt driven input (no polling)
• Install jumper to connect INTA interrupt from MCP23008 to GP0 on Pico (GP2 on later rev cards)
• No Pull-up

J2 - USB B Power Connector

• Full size USB B connector
• No USB signal connections, just used for power
• J4 provide an alternate way of powering the card

J3,J5 Pico Connectors

Pico Function Mapping

GP	FUNCTION	PICO PIN		GP	FUNCTION	PICO PIN
GP0	I2C1_INT (MCP23017)	1		GP16	VGA_HSYNC	21
GP1	SPARE	2		GP17	VGA_VSYNC	22
GP2	SPARE	4		GP18	VGA_BLU	24
GP3	SPARE	5		GP19	VGA_GRN_LO	25
GP4	SPARE	6		GP20	VGA_GRN_HI	26
GP5	SPARE	7		GP21	VGA_RED	27
GP6	AUDIO-L	9		GP22	SPARE	29
GP7	AUDIO-R	10		GP26	SPARE	31
GP8	PS2_CLK	11		GP27	SPARE	32
GP9	PS2_DATA	12		GP28	SPARE	34
GP10	SD_SCK	14		3.3V	POWER_3.3V	36
GP11	SD_MOSI	15		VSYS	PS2_5V	39
GP12	SD_MISO	16
GP13	SD_SLVSEL	17
GP14	I2C1_SDA (MCP23017)	19
GP15	I2C1_SCL (MCP23017)	20

J4 - 5V Input

• Useful for external 5V
• J2 is an alternate way of powering the card

J6 - 3.3V Power Out

• Useful for connecting up 3.3V power to external interfaces

J7 - Audio

• Low Pass filter
• Voltage divider to get to line level
  • Line Level Audio information
• Two Tone Test
• Play a WAV file

OPTION AUDIO GP6, GP7
PLAY WAV "file.wav"
PLAY STOP

J8 - PS/2 Keyboard

The PS2 keyboard connects to the Raspberry Pi Pico via a level shifter and works as a normal keyboard with the function keys and arrow keys fully operational. It can be configured for the standard US layout used in the USA, Australia and New Zealand or specialised layouts used in the United Kingdom, Germany, France and Spain.

J9 - GPIO

• 2x10 Header
• MCP23017 I2C Port Expander
• 16 bits o
• On I2C2 pins (I2C1 on Pico)
  • SetPin BASIC codef programmable I/O
• Later revs change the pinout to move the 3.3V power to the end

Initialization Code

SetPin GP14, GP15, I2C2
I2C2 OPEN 400, 100
I2C2 WRITE &H20, 0, 2, &H00, &H00
I2C2 WRITE &H20, 0, 2, &H01, &H00

J10 - VGA

The VGA output is 640 x 480 pixels in monochrome mode or 320 x 240 pixels in colour mode with 16 colours (1 bit for red, 2 bits for green and 1 bit for blue). The VGA output is generated using the second CPU on the RP2040 processor plus one PIO channel so it does not affect the BASIC interpreter which runs at full speed on the first CPU. A handfull of components (resistors and a couple of diodes) is all that is required to connect the VGA monitor.

From within your BASIC program you can turn pixels on/off and draw lines, boxes and circles in any colour. Text can be positioned anywhere on the screen and displayed in any colour in a variety of fonts.

The built-in editor within MMBasic works perfectly with the VGA monitor and PS2 keyboard to allow programs to be edited (with colour coded text) and saved to an SD card.

H1 - I2C2 Terminators

• Install shunts to terminate SDA, SCL signals
• Commands

SETPIN GP14, GP15, I2C2
I2C2 OPEN 400, 100
I2C2 WRITE &H20, OC, LEN, B0[, B1...]
I2C2 READ &H20, OX, LEN, BUFF()

• &H20 - I2C Address 0x20
• OC: 0=terminate after, 1=chain next
• len - Length of buffer (normally 1 for receive)
• B0,B1... Bytes to send
• BUFF() - receive buffer

SD1 - SD Card

The PicoMiteVGA firmware reserves eight program storage "slots" in the Raspberry Pi Pico flash memory. Programs can be saved and retreived from these without the need for any additional storage.

For more storage SD cards can be connected with full support for these built into MMBasic including the ability to open files for reading, writing or random access and loading and saving programs. SD cards connect directly to the Raspberry Pi Pico and the firmware will work with cards up to 32GB formatted in FAT16 or FAT32. The files created can be read and written on personal computers running Windows, Linux or the Mac operating system.

OPTION SDCARD GP13, GP10, GP11, GP12