nRF52840 with MCP2515

RE: nRF52840 with MCP2515

ovrebekk — Thu, 17 Mar 2022 09:10:13 GMT

Hi Lance

Fair point, if you want to implement it similar to the samples you should be able to do it like this:

#define CAN1_NODE DT_ALIAS(can1)
#if DT_NODE_HAS_STATUS(CAN1_NODE, okay)
#define CAN1	DT_LABEL(CAN1_NODE)
#else
#error "CAN not present!"
#endif

Just note that you need to refer to CAN1 rather than CAN1_NODE later on, when you acquire the device binding etc.

Best regards
Torbjørn

RE: nRF52840 with MCP2515

lance-f1 — Wed, 16 Mar 2022 17:05:44 GMT

Hi Torbjørn,

When doing that the #if DT_NODE_HAS_STATUS(CAN1_NODE, okay) in main.c no longer can see CAN1_NODE (i.e. it thinks it is not defined).

#define CAN1_NODE DT_LABEL(DT_ALIAS(can1))
// #define CAN1_NODE DT_ALIAS(can1) // DT_NODELABEL(can1)

#if DT_NODE_HAS_STATUS(CAN1_NODE, okay)
#else
#error "Unsupported board: can0 devicetree alias is not defined"
#endif

RE: nRF52840 with MCP2515

ovrebekk — Wed, 16 Mar 2022 16:08:14 GMT

Hi Lance

What if you also use the DT_LABEL macro, like this?

#define CAN1_NODE DT_LABEL(DT_ALIAS(can1))

Best regards
Torbjørn