Initial SPI commit

2 files changed, 129 insertions, 0 deletions

diff --git a/shared-module/busdevice/SPIDevice.c b/shared-module/busdevice/SPIDevice.c
new file mode 100644
index 000000000..d9b63a007
--- /dev/null
+++ b/shared-module/busdevice/SPIDevice.c
@@ -0,0 +1,85 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2020 Mark Komus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "shared-bindings/busdevice/SPIDevice.h"
+#include "shared-bindings/busio/SPI.h"
+#include "shared-bindings/digitalio/DigitalInOut.h"
+#include "py/mperrno.h"
+#include "py/nlr.h"
+#include "py/runtime.h"
+
+void common_hal_busdevice_spidevice_construct(busdevice_spidevice_obj_t *self, busio_spi_obj_t *spi,  digitalio_digitalinout_obj_t *cs,
+    uint32_t baudrate, uint8_t polarity, uint8_t phase, uint8_t extra_clocks) {
+    self->spi = spi;
+    self->baudrate = baudrate;
+    self->polarity = polarity;
+    self->phase = phase;
+    self->extra_clocks = extra_clocks;
+    self->chip_select = cs;
+}
+
+void common_hal_busdevice_spidevice_enter(busdevice_spidevice_obj_t *self) {
+    bool success = false;
+    while (!success) {
+        success = common_hal_busio_spi_try_lock(self->spi);
+        RUN_BACKGROUND_TASKS;
+        mp_handle_pending();
+    }
+
+    common_hal_busio_spi_configure(self->spi, self->baudrate, self->polarity, self->phase, 8);
+
+    if (self->chip_select != MP_OBJ_NULL) {
+        common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), false);
+    }
+}
+
+void common_hal_busdevice_spidevice_exit(busdevice_spidevice_obj_t *self) {
+    if (self->chip_select != MP_OBJ_NULL) {
+        common_hal_digitalio_digitalinout_set_value(MP_OBJ_TO_PTR(self->chip_select), true);
+    }
+
+    if (self->extra_clocks > 0) {
+
+        mp_buffer_info_t bufinfo;
+        mp_obj_t buffer = mp_obj_new_bytearray_of_zeros(1);
+
+        mp_get_buffer_raise(buffer, &bufinfo, MP_BUFFER_READ);
+        ((uint8_t*)bufinfo.buf)[0]  = 0xFF;
+
+        uint8_t clocks = self->extra_clocks / 8;
+        if ((self->extra_clocks % 8) != 0)
+            clocks += 1;
+
+        while (clocks > 0) {
+            if (!common_hal_busio_spi_write(self->spi, ((uint8_t*)bufinfo.buf), 1)) {
+                mp_raise_OSError(MP_EIO);
+            }
+            clocks--;
+        }
+    }
+
+    common_hal_busio_spi_unlock(self->spi);
+}
diff --git a/shared-module/busdevice/SPIDevice.h b/shared-module/busdevice/SPIDevice.h
new file mode 100644
index 000000000..ffabf79df
--- /dev/null
+++ b/shared-module/busdevice/SPIDevice.h
@@ -0,0 +1,44 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSDEVICE_SPIDEVICE_H
+#define MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSDEVICE_SPIDEVICE_H
+
+#include "py/obj.h"
+#include "common-hal/busio/SPI.h"
+#include "common-hal/digitalio/DigitalInOut.h"
+
+typedef struct {
+    mp_obj_base_t base;
+    busio_spi_obj_t *spi;
+    uint32_t baudrate;
+    uint8_t polarity;
+    uint8_t phase;
+    uint8_t extra_clocks;
+    digitalio_digitalinout_obj_t *chip_select;
+} busdevice_spidevice_obj_t;
+
+#endif // MICROPY_INCLUDED_ATMEL_SAMD_SHARED_MODULE_BUSDEVICE_SPIDEVICE_H