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'):

• 0...9 - wait measurements of T from Nth controller (0==T for master)
• A send everybody to start T measurement
• B send dummy CAN messages to broadcast address
• C show coefficients for all thermosensors
• D send dummy CAN messages to master (0) address
• E end temperature scan
• F turn sensors off
• G get CAN address
• H switch I2C to high speed (100kHz)
• I reinit CAN
• L switch I2C to low speed (default, 10kHz)
• O turn sensors on
• P ping everyone over CAN
• R reinit I2C
• S start temperature scan
• T start single temperature measurement
• V very low speed
• Z get sensors state over CAN

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); 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 byte of every sequence is command mark (0xA5) or data mark (0x5A).

Commands:

• CMD_PING - send from master to receive answer in data packet if target alive.
• CMD_START_MEASUREMENT - start single temperature measurement.
• CMD_SENSORS_STATE - state of sensors.

Data format:

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

Thermal data format:

• 3 byte - 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)
• 4 byte - thermal data H
• 5 byte - thermal data L