MCP2515 class¶
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MCP2515(dvr, cs, rst=None, clk=800000):
Creates an instance of the MCP2515 class. This class allows the control of MCP2515 devices.
Parameters: - drv – SPI Driver used ‘(SPI0, ...)’
- cs – Chip select of the SPI driver
- rst – Reset pin (default None)
- clk – Clock speed, default 800 kHz
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init
(idmode, speed, clock)¶ Initializes the MCP2515 chip
Parameters: - idmode – set the RX buffer id mode (selectable from mcp2515.MCP_STDEXT, mcp2515.MCP_STD, mcp2515.MCP_EXT, or mcp2515.MCP_ANY
- speed – set the speed of the CAN communication
- clock – set the clock of the CAN Communication
Possible combination of values for Clock and Speed are:
Clock –> 8MHZ
Clock Speed “8MHZ” “5KBPS” “8MHZ” “10KBPS” “8MHZ” “20KBPS” “8MHZ” “31KBPS” “8MHZ” “33KBPS” “8MHZ” “40KBPS” “8MHZ” “50KBPS” “8MHZ” “80KBPS” “8MHZ” “100KBPS” “8MHZ” “125KBPS” “8MHZ” “200KBPS” “8MHZ” “250KBPS” “8MHZ” “500KBPS” “8MHZ” “1000KBPS” Clock –> 16MHZ
Clock Speed “16MHZ” “5KBPS” “16MHZ” “10KBPS” “16MHZ” “20KBPS” “16MHZ” “33KBPS” “16MHZ” “40KBPS” “16MHZ” “50KBPS” “16MHZ” “80KBPS” “16MHZ” “100KBPS” “16MHZ” “125KBPS” “16MHZ” “200KBPS” “16MHZ” “250KBPS” “16MHZ” “500KBPS” “16MHZ” “1000KBPS” Clock –> 20MHZ
Clock Speed “20MHZ” “40KBPS” “20MHZ” “50KBPS” “20MHZ” “80KBPS” “20MHZ” “100KBPS” “20MHZ” “125KBPS” “20MHZ” “200KBPS” “20MHZ” “250KBPS” “20MHZ” “500KBPS” “20MHZ” “1000KBPS”
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set_mode
(mode)¶ Sets the operation mode of the MCP2515
Parameters: mode – operation mode (“NORMAL”, “SLEEP”, “LOOPBACK”, “LISTENONLY”, “CONFIG”, “POWERUP”, “ONE_SHOT”)
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init_mask
(num, data, ext)¶ Initializes Masks
Parameters: - num – 0 to set mask 0 on RX buffer, 1 to set mask 1 on RX buffer
- data – Data Mask
- ext – 0 for standard ID, 1 for Extended ID
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init_filter
(num, data, ext)¶ Initializes Filters
Parameters: - num – number of filter to be set in RX buffer (from 0 to 5)
- data – Data Filter
- ext – 0 for standard ID, 1 for Extended ID
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send
(canid, data, ext=None)¶ Sends CAN messages
Parameters: - canid – ID of the CAN message (bytearray of 4 bytes)
- data – Data to be sent (list of 8 bytes)
- ext – 0 for standard ID, 1 for Extended ID (default None - auto detected)
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recv
()¶ Receives CAN messages returnung CAN id value and related data message
Returns canid, msg