libraries: SPI: hanlde multiple SPI instances

Create multiple SPI instance if spis array contains plural elements.
Declare these as 'SPI1', 'SPI2', ..., from second element of the array.
(First element is already declare as 'SPI'.)

This works if `spis` property defined.
The property parse as SPI array declaration, to define SPI instance
with the name of SPI, SPI1, SPI2...
If `spis` is not defined but the DTS already defines `arduino-spi` and,
use it to define first SPI instance.
The `arduion-spi` is usually define with arduino_header in
boards definitions.

Signed-off-by: TOKITA Hiroshi <[email protected]>

Author: soburi

libraries/SPI/SPI.cpp

@@ -121,5 +121,28 @@ void arduino::ZephyrSPI::begin() {}
 
 void arduino::ZephyrSPI::end() {}
 
+#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))
+arduino::ZephyrSPI
+    SPI(DEVICE_DT_GET(DT_NODELABEL(arduino_spi)));
+#endif

libraries/SPI/SPI.h

@@ -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)))
+
+/* 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;