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71 lines
2.4 KiB
Markdown
71 lines
2.4 KiB
Markdown
# Firmware for controllers of thermal sensors
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Make regular scan of 8 sensors' pairs.
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USART speed 115200. Code for ../../kicad/stm32
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### Serial interface commands (ends with '\n'), small letter for only local processing:
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- **1...7** - send message to Nth controller, not broadcast (after number should be CAN command)
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- **B** send dummy CAN messages to broadcast address
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- **c** show coefficients for all thermosensors
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- **D** send dummy CAN messages to master (0) address
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- **Ee** end temperature scan
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- **Ff** turn sensors off
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- **g** get last CAN address
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- **Hh** switch I2C to high speed (100kHz)
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- **i** reinit CAN
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- **Ll** switch I2C to low speed (default, 10kHz)
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- **P** ping everyone over CAN
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- **Rr** reinit I2C
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- **Ss** start temperature scan
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- **Tt** start single temperature measurement
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- **u** check CAN bus status for errors
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- **Vv** very low speed
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- **Z** get sensors state over CAN
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### PINOUT
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- I2C: PB6 (SCL) & PB7 (SDA)
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- USART1: PA9 (Tx) & PA10 (Rx)
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- CAN bus: PB8 (Rx), PB9 (Tx)
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- USB bus: PA11 (DM), PA12 (DP)
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- I2C multiplexer: PB0..PB2 (0..2 address bits), PB12 (~EN)
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- sensors' power: PB3 (in, overcurrent), PA8 (out, enable power)
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- signal LEDs: PB10 (LED0), PB11 (LED1)
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- ADC inputs: PA0 (V12/4.93), PA1 (V5/2), PA3 (I12 - 1V/A), PA6 (V3.3/2)
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- controller CAN address: PA13..PA15 (0..2 bits); 0 - master, other address - slave
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### LEDS
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- LED0 (nearest to sensors' connectors) - heartbeat
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- LED1 (above LED0) - CAN bus OK
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### CAN protocol
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Variable data length: from 1 to 7 bytes.
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First byte of every sequence is command mark (0xA5) or data mark (0x5A).
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Commands:
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- CMD_PING request for PONG cmd
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- CMD_START_MEASUREMENT start single temperature measurement
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- CMD_SENSORS_STATE get sensors state
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- CMD_START_SCAN run scan mode
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- CMD_STOP_SCAN stop scan mode
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- CMD_SENSORS_OFF turn off power of sensors
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- CMD_LOWEST_SPEED lowest I2C speed
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- CMD_LOW_SPEED low I2C speed (10kHz)
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- CMD_HIGH_SPEED high I2C speed (100kHz)
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- CMD_REINIT_I2C reinit I2C with current speed
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Dummy commands for test purposes:
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- CMD_DUMMY0 = 0xDA,
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- CMD_DUMMY1 = 0xAD
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Data format:
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- 1 byte - Controller number
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- 2 byte - Command received
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- 3..7 bytes - data
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Thermal data format:
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- 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)
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- 4 byte - thermal data H
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- 5 byte - thermal data L
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