CAPTURinoEmbedded_ESP32

Driver software to run the CAPTURino application software on a ESP32 platform.

Utilized IOs of the ESP32:

• GPIO 1: Serial TX
• GPIO 3: Serial RX
• GPIO 21: I2C SDA
• GPIO 22: I2C SCL
• GPIO 19: SPI CS
• GPIO 2: SPI CIPO ( \todo probably use different pin as this is used for boot mode selection)
• GPIO 4: SPI COPI
• GPIO 0: SPI CLK ( \todo probably use different pin as this is used for boot mode selection)
• GPIO 5: New message interrupt line
• GPIO 13: Identification input 1 (HIGH) (generates an interrupt if changed)
• GPIO 27: Identification input 2
• GPIO 25: Identification input 3
• GPIO 26: Identification input 4

The peripherals are used for the following purposes:

• Serial communication: Communication of the CAPTURino hardware to the CAPTURino plugin, or any terminal program to provide a command line interface
• I2C: Read and write to the connected EEPROM
• SPI: Receive data from the CAN to SPI converter (MCP2515)
• New message interrupt line: additonal pin provided by the MCP2515
• Identification input 1-4: 4-bit code, used by the application software to determine further ways of identification.

Currently there are only two 4-bit codes implemented:

• 0b0000: No PHY- or levelshifterboard connected
• 0b0001: PHY- or levelshifterboard connected. Further information is stored at the EEPROM with I2C address 0b1010000. Within this EEPROM at adress 0x00 there is a 32-bit ID, stored in big endian format, which holds information regarding the bus type that can be captured with the device.

Schematic to sniff CAN messages with an ESP32