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libraries: SPI: Hanlde multiple SPI instances #113

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Aug 30, 2024
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libraries: SPI: Hanlde multiple SPI instances #113

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25 changes: 23 additions & 2 deletions libraries/SPI/SPI.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -121,5 +121,26 @@ void arduino::ZephyrSPI::begin() {}

void arduino::ZephyrSPI::end() {}

arduino::ZephyrSPI
SPI(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(DT_PATH(zephyr_user), spis, 0)));
#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), spis)
#if (DT_PROP_LEN(DT_PATH(zephyr_user), spis) > 1)
#define ARDUINO_SPI_DEFINED_0 1
#define DECL_SPI_0(n, p, i) arduino::ZephyrSPI SPI(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(n, p, i)));
#define DECL_SPI_N(n, p, i) arduino::ZephyrSPI SPI##i(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(n, p, i)));
#define DECLARE_SPI_N(n, p, i) \
COND_CODE_1(ARDUINO_SPI_DEFINED_##i, (DECL_SPI_0(n, p, i)), (DECL_SPI_N(n, p, i)))

/* Declare SPI, SPI1, SPI2, ... */
DT_FOREACH_PROP_ELEM(DT_PATH(zephyr_user), spis, DECLARE_SPI_N)

#undef DECLARE_SPI_N
#undef DECL_SPI_N
#undef DECL_SPI_0
#undef ARDUINO_SPI_DEFINED_0
#else // PROP_LEN(spis) > 1
/* When PROP_LEN(spis) == 1, DT_FOREACH_PROP_ELEM work not correctly. */
arduino::ZephyrSPI SPI(DEVICE_DT_GET(DT_PHANDLE_BY_IDX(DT_PATH(zephyr_user), spis, 0)));
#endif // HAS_PORP(spis)
/* If spis node is not defined, tries to use arduino_spi */
#elif DT_NODE_EXISTS(DT_NODELABEL(arduino_spi))
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So where does the arduino-spi name come from? Are any boards already defining it using that label?

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It is usually define with arduino_header in zephyr/boards definitions.
This line is intended to take advantage of it if it is already defined.
And we can override with overlay in this package with defining spis property.

arduino::ZephyrSPI SPI(DEVICE_DT_GET(DT_NODELABEL(arduino_spi)));
#endif
17 changes: 17 additions & 0 deletions libraries/SPI/SPI.h
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Original file line number Diff line number Diff line change
Expand Up @@ -56,7 +56,24 @@ class ZephyrSPI : public HardwareSPI {

} // namespace arduino

#if DT_NODE_HAS_PROP(DT_PATH(zephyr_user), spis) && (DT_PROP_LEN(DT_PATH(zephyr_user), spis) > 1)
#define ARDUINO_SPI_DEFINED_0 1
#define DECL_EXTERN_SPI_0(i) extern arduino::ZephyrSPI SPI
#define DECL_EXTERN_SPI_N(i) extern arduino::ZephyrSPI SPI##i
#define DECLARE_EXTERN_SPI_N(n, p, i) \
COND_CODE_1(ARDUINO_SPI_DEFINED_##i, (DECL_EXTERN_SPI_0(i);), (DECL_EXTERN_SPI_N(i);))

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Please fix above checkpatch warns @soburi .

WARNING: please, no spaces at the start of a line

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Was this fixed?
Can you please fix, rebase and force push if not done?

/* Declare SPI, SPI1, SPI2, ... */
DT_FOREACH_PROP_ELEM(DT_PATH(zephyr_user), spis, DECLARE_EXTERN_SPI_N)

#undef DECLARE_EXTERN_SPI_N
#undef DECL_EXTERN_SPI_N
#undef DECL_EXTERN_SPI_0
#undef ARDUINO_SPI_DEFINED_0
#else
extern arduino::ZephyrSPI SPI;
#endif

/* Serial Peripheral Control Register */
extern uint8_t SPCR;

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