From 8d1d821876b77a3f7213f3bf5468f38af2a4fc9f Mon Sep 17 00:00:00 2001
From: Matt Land <mland@sparefoot.com>
Date: Wed, 16 May 2018 14:58:57 -0400
Subject: [PATCH] pin issue

---
 ports/atmel-samd/board_busses.c               | 28 +++++++++++++++++++
 ports/atmel-samd/board_busses.h               |  3 ++
 .../circuitplayground_express/mpconfigboard.h |  4 +++
 .../boards/circuitplayground_express/pins.c   |  1 +
 4 files changed, 36 insertions(+)

diff --git a/ports/atmel-samd/board_busses.c b/ports/atmel-samd/board_busses.c
index fa38972064..8f007aa754 100644
--- a/ports/atmel-samd/board_busses.c
+++ b/ports/atmel-samd/board_busses.c
@@ -25,6 +25,7 @@
  */
 
 #include "shared-bindings/busio/I2C.h"
+#include "shared-bindings/busio/SPI.h"
 #include "shared-bindings/microcontroller/Pin.h"
 #include "mpconfigboard.h"
 #include "pins.h"
@@ -60,3 +61,30 @@
 #endif
 
 MP_DEFINE_CONST_FUN_OBJ_0(board_i2c_obj, board_i2c);
+
+#if !defined(DEFAULT_SPI_BUS_CLK) || !defined(DEFAULT_SPI_BUS_MISO) || !defined(DEFAULT_SPI_BUS_MOSI)
+    STATIC mp_obj_t board_spi(void) {
+        mp_raise_NotImplementedError("No default SPI bus");
+        return NULL;
+    }
+#else
+    STATIC mp_obj_t spi_singleton = NULL;
+
+    STATIC mp_obj_t board_spi(void) {
+
+        if (spi_singleton == NULL) {
+            busio_spi_obj_t *self = m_new_obj(busio_spi_obj_t);
+            self->base.type = &busio_spi_type;
+            assert_pin_free(DEFAULT_SPI_BUS_CLK);
+            assert_pin_free(DEFAULT_SPI_BUS_MOSI);
+            assert_pin_free(DEFAULT_SPI_BUS_MISO);
+            const mcu_pin_obj_t* clock = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_CLK);
+            const mcu_pin_obj_t* mosi = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_MOSI);
+            const mcu_pin_obj_t* miso = MP_OBJ_TO_PTR(DEFAULT_SPI_BUS_MISO);
+            common_hal_busio_spi_construct(self, clock, mosi, miso);
+            spi_singleton = (mp_obj_t)self;
+        }
+        return spi_singleton;
+    }
+#endif
+MP_DEFINE_CONST_FUN_OBJ_0(board_spi_obj, board_spi);
diff --git a/ports/atmel-samd/board_busses.h b/ports/atmel-samd/board_busses.h
index e872e4902b..d0cd5dbf78 100644
--- a/ports/atmel-samd/board_busses.h
+++ b/ports/atmel-samd/board_busses.h
@@ -30,4 +30,7 @@
 void board_i2c(void);
 extern mp_obj_fun_builtin_fixed_t board_i2c_obj;
 
+void board_spi(void);
+extern mp_obj_fun_builtin_fixed_t board_spi_obj;
+
 #endif  // MICROPY_INCLUDED_ATMEL_SAMD_BOARD_BUSSES_H
diff --git a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
index 6ea0d93602..34b0a01fed 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
+++ b/ports/atmel-samd/boards/circuitplayground_express/mpconfigboard.h
@@ -61,3 +61,7 @@
 
 #define DEFAULT_I2C_BUS_SCL (&pin_PB03)
 #define DEFAULT_I2C_BUS_SDA (&pin_PB02)
+
+#define DEFAULT_SPI_BUS_CLK (&pin_PA21)
+#define DEFAULT_SPI_BUS_MISO (&pin_PA16)
+#define DEFAULT_SPI_BUS_MOSI (&pin_PA20)
diff --git a/ports/atmel-samd/boards/circuitplayground_express/pins.c b/ports/atmel-samd/boards/circuitplayground_express/pins.c
index c0545fd7c0..4f32ecafab 100644
--- a/ports/atmel-samd/boards/circuitplayground_express/pins.c
+++ b/ports/atmel-samd/boards/circuitplayground_express/pins.c
@@ -58,5 +58,6 @@ STATIC const mp_rom_map_elem_t board_global_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_MOSI), MP_ROM_PTR(&pin_PA07) },
     { MP_ROM_QSTR(MP_QSTR_MISO), MP_ROM_PTR(&pin_PA06) },
     { MP_ROM_QSTR(MP_QSTR_I2C), MP_ROM_PTR(&board_i2c_obj) },
+    { MP_ROM_QSTR(MP_QSTR_SPI), MP_ROM_PTR(&board_spi_obj) },
 };
 MP_DEFINE_CONST_DICT(board_module_globals, board_global_dict_table);