SHPI.zero Basic ATmega32u4 Firmware

Basic firmware for ATmega32u4 as I2C-Slave

• communication only over I2C (USB free for CULFW)
• backlight control
• LCD setup
• control relays
• control internal blower fan
• control LED
• read sensors and more
• uses counter0 for VENT PWM

prerequisites

A SHPI.zero with GCC and DFU-programmer installed.

Getting Started

Download GIT folder on your SHPI.zero:

git clone https://github.com/shpi/zero_avr_firmware_std.git

I2C example command

Read relay 1 status

i2cget -y 2 0x2A 0x0D             

it should return :

0x00   // or 0xFF, depending relay 1 status 

If response consists more bytes, use

i2cget -y 2 0x2A    

to read one more byte.

Set RGB LED to white

i2cset -y 2 0x2A 0x8c 0xFF 0xFF 0xFF i    

Compile & flash

To compile and flash:

cd zero_avr_firmware
sudo make flash

I2C read commands

value	commandbyte	in hex	response	format
A0 (GD0 CC1101)	0b00000000	0x00	10bit in 2 Byte	0 -1023
A1 (MICS CO)	0b00000001	0x01	10bit in 2 Byte	0 -1023
A2 (MICS No2)	0b00000010	0x02	10bit in 2 Byte	0 -1023
A3 (MICS NH3	0b00000011	0x03	10bit in 2 Byte	0 -1023
A4 (MP135)	0b00000100	0x04	10bit in 2 Byte	0 -1023
A5 (NTC 10K)	0b00000101	0x05	10bit in 2 Byte	0 -1023
A7 (ACS712)	0b00000110	0x06	10bit in 2 Byte	0 -1023
BL_LEVEL	0b00000111	0x07	1 Byte	0-31
VENT_RPM	0b00001000	0x08	2 Byte	UPM
VCC Atmega	0b00001001	0x09	2 Byte	in Millivolts
IntTemp Atmega	0b00001010	0x0A	2 Byte	degree celsius
FREERAM	0b00001011	0x0B	2 Byte	in Bytes
LED_COLOR	0b00001100	0x0C	3 Byte	R, G, B 0-255
Relay1	0b00001101	0x0D	1 Byte	0x00 / 0xFF
Relay2	0b00001110	0x0E	1 Byte	0x00 / 0xFF
Relay3	0b00001111	0x0F	1 Byte	0x00 / 0xFF
D13 (reset RPI)	0b00010000	0x10	1 Byte	0x00 / 0xFF
HWB (gasheater)	0b00010001	0x11	1 Byte	0x00 / 0xFF
Buzzer	0b00010010	0x12	1 Byte	0x00 / 0xFF
VENT_PWM	0b00010011	0x13	1 Byte	0 – 255
A7_VG(AC curr)	0b00010110	0x14	1 Byte	0 – 1023

I2C write commands

command	commandbyte	in hex	expects	value
BL_LEVEL_s	0b10000111	0x87	1 Byte	0 = off .. 31= 100%
LED_COLOR_s	0b10001100	0x8C	3 Byte	R, G, B 0-255
Relay1_S	0b10001101	0x8D	1 Byte	0x00 / 0xFF
Relay2_S	0b10001110	0x8E	1 Byte	0x00 / 0xFF
Relay3_S	0b10001111	0x8F	1 Byte	0x00 / 0xFF
D13_S	0b10010000	0x90	1 Byte	0x00 / 0xFF
HWB_S	0b10010001	0x91	1 Byte	0x00 / 0xFF
Buzzer_S	0b10010010	0x92	1 Byte	0x00 / 0xFF - NEW:0x01 for click
VENT_PWM_S	0b10010011	0x93	1 Byte	0 = on .. 255 = off

License

This project is licensed under the GPL v3 license.