Low-overhead, bidirectional error checking for a serial peripheral interface
Example embodiments relate to low-overhead, bidirectional error checking for a serial peripheral interface. An example device includes an integrated circuit. The device also includes a serial peripheral interface (SPI) with a Master In Slave Out (MISO) channel and a Master Out Slave In (MOSI) channel. The MOSI channel is configured to receive a write address, payload data, and a forward error-checking code usable to identify data corruption within the write address or the payload data. The integrated circuit is configured to calculate and provide a reverse error-checking code usable to identify data corruption within the write address or the payload data. Additionally, the integrated circuit is configured to compare the forward error-checking code to the reverse error-checking code. Further, the integrated circuit is configured to write, to the write address if the forward error-checking code matches the reverse error-checking code, the payload data.
1. A device comprising:
an integrated circuit; and
a serial peripheral interface (SPI) communicatively coupled to the integrated circuit,
wherein the SPI comprises a Master In Slave Out (MISO) channel and a Master Out Slave In (MOSI) channel, and
wherein the integrated circuit is configured to:
provide, to the MOSI channel, a write address within a subcontroller to be written to;
provide, to the MOSI channel, payload data to be written;
provide, to the MOSI channel, a forward error-checking code usable to identify data corruption within the write address or the payload data;
receive, from the MISO channel, a reverse error-checking code calculated by the subcontroller based on the write address and the payload data, wherein the reverse error-checking code is usable to identify data corruption within the write address or the payload data;
compare the reverse error-checking code to the forward error-checking code to determine that a transmission error has occurred; and
initiate, in response to determining that the transmission error has occurred, appropriate remedial action.
2. The device of claim 1 , wherein the appropriate remedial action comprises again:
providing, to the MOSI channel, the write address to be written to; and
providing, to the MOSI channel, the payload data to be written.
3. The device of claim 1 , wherein the appropriate remedial action comprises providing, to the MOSI channel, only a portion of the payload data to be written.
4. The device of claim 1 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the device.
5. The device of claim 1 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the subcontroller.
6. The device of claim 1 , wherein the appropriate remedial action comprises setting a flag indicating that the device, the subcontroller, an associated lidar device, an associated firing circuit, or associated light emitters are functioning improperly or require repair.
7. The device of claim 1 , wherein the appropriate remedial action comprises decommissioning the device, the subcontroller, an associated lidar device, an associated firing circuit, or associated light emitters.
8. A method comprising:
providing, to a Master Out Slave In (MOSI) channel of a serial peripheral interface (SPI) of a controller, a write address within a subcontroller to be written to;
providing, to the MOSI channel, payload data to be written;
providing, to the MOSI channel, a forward error-checking code usable to identify data corruption within the write address or the payload data;
receiving, from a Master In Slave Out (MISO) channel of the SPI of the controller, a reverse error-checking code calculated by the subcontroller based on the write address and the payload data, wherein the reverse error-checking code is usable to identify data corruption within the write address or the payload data;
comparing the reverse error-checking code to the forward error-checking code to determine that a transmission error has occurred; and
initiating, in response to determining that the transmission error has occurred, appropriate remedial action.
9. The method of claim 8 , wherein the appropriate remedial action comprises again:
providing, to the MOSI channel, the write address to be written to; and
providing, to the MOSI channel, the payload data to be written.
10. The method of claim 8 , wherein the appropriate remedial action comprises providing, to the MOSI channel, only a portion of the payload data to be written.
11. The method of claim 8 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the controller.
12. The method of claim 8 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the subcontroller.
13. The method of claim 8 , wherein the appropriate remedial action comprises setting a flag indicating that the controller, the subcontroller, an associated lidar device, an associated firing circuit, or associated light emitters are functioning improperly or require repair.
14. The method of claim 8 , wherein the appropriate remedial action comprises decommissioning the controller, the subcontroller, an associated lidar device, an associated firing circuit, or associated light emitters.
15. A system comprising:
a subcontroller;
a controller comprising an integrated circuit, wherein the controller and the subcontroller are communicatively coupled over a serial peripheral interface (SPI) comprising a Master In Slave Out (MISO) channel and a Master Out Slave In (MOSI) channel, and
wherein the integrated circuit is configured to:
provide, to the MOSI channel, a write address within the subcontroller to be written to;
provide, to the MOSI channel, payload data to be written;
provide, to the MOSI channel, a forward error-checking code usable to identify data corruption within the write address or the payload data;
receive, from the MISO channel, a reverse error-checking code calculated by the subcontroller based on the write address and the payload data, wherein the reverse error-checking code is usable to identify data corruption within the write address or the payload data;
compare the reverse error-checking code to the forward error-checking code to determine that a transmission error has occurred; and
initiate, in response to determining that the transmission error has occurred, appropriate remedial action.
16. The system of claim 15 , wherein the appropriate remedial action comprises again:
providing, to the MOSI channel, the write address to be written to; and
providing, to the MOSI channel, the payload data to be written.
17. The system of claim 15 , wherein the appropriate remedial action comprises providing, to the MOSI channel, only a portion of the payload data to be written.
18. The system of claim 15 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the controller.
19. The system of claim 15 , wherein initiating the appropriate remedial action comprises initiating a repair or replacement of the subcontroller.
20. The system of claim 15 , wherein the appropriate remedial action comprises setting a flag indicating that the controller, the subcontroller, an associated lidar device, an associated firing circuit, or associated light emitters are functioning improperly or require repair.