Can2040 provides up to two CAN bus implementations and runs on the PIO while using part of the cycles from one of the two Arm Cortex-M0+ cores.
The flexible programmable input/output (PIO) blocks of the Raspberry Pi Pico series, and therefore other boards based on the same RP2040 microcontroller, now have CAN bus compatibility, according to developer Kevin O'Connor.
O'Connor states in an introduction, "The can2040 project is a software CAN bus implementation for Raspberry Pi RP2040 microcontrollers." "It enables the use of a common CAN transceiver chip to create [a] CAN bus on an RP2040 chip. The code allows for up to 1Mbit per second reading and writing of CAN 2.0B data frames."
The project makes use of the RP2040's programmable input/output (PIO) blocks, which enable up to eight straightforward real-time state machines to operate independently of the two Arm Cortex-M0+ cores. However, O'Connor's CAN bus design utilizes all of the RP2040's two Arm Cortex-M0+ cores in addition to the PIO blocks.
O'Connor says, "The can2040 system is a software CAN bus implementation. It uses the RP2040 PIO device in addition to the RP2040 Arm core processing time. Can2040 may be given an ARM core. Additionally, sharing an Arm core with application code is feasible for can2040.
O'Connor writes, "The implementation employs one of the two RP2040 PIO hardware blocks. "By using both PIO blocks, a single RP2040 chip may have two distinct CAN bus interfaces. It functions with common CAN bus transceivers. For the "CAN RX" and "CAN TX" cables, any two GPIO [General-Purpose Input/Output] pins on the RP2040 may be utilized."
On O'Connor's GitHub repository, the project's source code and detailed information about its application programming interface (API) are accessible under the reciprocal GNU General Public License 3.
