tsys01/STM32/TSYS_controller

Firmware for controllers of thermal sensors

Make regular scan of 8 sensors' pairs. USART speed 115200. Code for ../../kicad/stm32

Serial interface commands (ends with '\n'), small letter for only local processing:

• 0...7 send message to Nth controller, not broadcast (after number should be CAN command)
• a get raw ADC values
• B send dummy CAN messages to broadcast address
• c show coefficients for all thermosensors
• D send dummy CAN messages to master (0) address
• Ee end temperature scan
• Ff turn sensors off
• g get last CAN address
• Hh switch I2C to high speed (100kHz)
• i reinit CAN with new address (if changed)
• Jj get MCU temperature
• Kk get values of U and I
• Ll switch I2C to low speed (default, 10kHz)
• Mm change master id to 0 (m) / broadcast (M)
• Oo turn onboard diagnostic LEDs On or off (both commands are local!)
• P ping everyone over CAN
• Rr reinit I2C
• Ss start temperature scan
• Tt start single temperature measurement
• u check CAN bus status for errors
• Vv very low speed
• Z get sensors state over CAN

The command M allows to temporaly change master ID of all controllers to broadcast ID. So all data they sent will be accessed @ any controller.

PINOUT

• I2C: PB6 (SCL) & PB7 (SDA)
• USART1: PA9 (Tx) & PA10 (Rx)
• CAN bus: PB8 (Rx), PB9 (Tx)
• USB bus: PA11 (DM), PA12 (DP)
• I2C multiplexer: PB0..PB2 (0..2 address bits), PB12 (~EN)
• sensors' power: PB3 (in, overcurrent), PA8 (out, enable power)
• signal LEDs: PB10 (LED0), PB11 (LED1)
• ADC inputs: PA0 (V12/4.93), PA1 (V5/2), PA3 (I12 - 1V/A), PA6 (V3.3/2)
• controller CAN address: PA13..PA15 (0..2 bits), PB15 (3rd bit); 0 - master, other address - slave

LEDS

• LED0 (nearest to sensors' connectors) - heartbeat
• LED1 (above LED0) - CAN bus OK

CAN protocol

Variable data length: from 1 to 7 bytes. First (number zero) byte of every sequence is command mark (0xA5) or data mark (0x5A).

Commands:

• CMD_PING request for PONG cmd
• CMD_START_MEASUREMENT start single temperature measurement
• CMD_SENSORS_STATE get sensors state
• CMD_START_SCAN run scan mode
• CMD_STOP_SCAN stop scan mode
• CMD_SENSORS_OFF turn off power of sensors
• CMD_LOWEST_SPEED lowest I2C speed
• CMD_LOW_SPEED low I2C speed (10kHz)
• CMD_HIGH_SPEED high I2C speed (100kHz)
• CMD_REINIT_I2C reinit I2C with current speed

Dummy commands for test purposes:

• CMD_DUMMY0 = 0xDA,
• CMD_DUMMY1 = 0xAD

Data format:

• byte 1 - Controller number
• byte 2 - Command received
• bytes 3..7 - data

Thermal data format:

• byte 3 - Sensor number (10*N + M, where N is multiplexer number, M - number of sensor in pair, i.e. 0,1,10,11,20,21...70,71)
• byte 4 - thermal data H
• byte 5 - thermal data L

MCU temperature data format:

• byte 3 - data H
• byte 4 - data L

All temperature is in degrC/100

U and I data format:

• byte 2 - type of data (CMD_GETUIVAL0 - V12 and V5, CMD_GETUIVAL1 - I12 and V3.3) case CMD_GETUIVAL0:
• bytes 3,4 - V12 H/L
• bytes 5,6 - V5 H/L case CMD_GETUIVAL1:
• bytes 3,4 - I12 H/L
• bytes 5,6 - V33 H/L Voltage is in V/100, Current is in mA