samples: Add a sample SPI application for W25Q80BL

W25Q80BL is the SPI flash chip soldered on the Quark SE development
board, for communicating with it, having support for using GPIO as Chip
Select is necessary, so it will be useful when testing that feature.

Change-Id: Idbf571cdb3b1ae8704d7a932bc0ac56dc53f8ff1
Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@intel.com>

samples/nanokernel/apps/w25q80bl/Makefile

@@ -0,0 +1,5 @@
+KERNEL_TYPE = nano
+BOARD ?= qemu_x86
+CONF_FILE = prj.conf
+
+include ${ZEPHYR_BASE}/Makefile.inc

samples/nanokernel/apps/w25q80bl/prj.conf

@@ -0,0 +1 @@
+CONFIG_SPI=y

samples/nanokernel/apps/w25q80bl/src/Makefile

@@ -0,0 +1 @@
+obj-y += main.o

samples/nanokernel/apps/w25q80bl/src/main.c

@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2016 Intel Corporation.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <zephyr.h>
+
+#include <device.h>
+#include <spi.h>
+
+#include <misc/printk.h>
+
+#if (!defined(CONFIG_SPI_QMSI_CS_GPIO) || !defined(CONFIG_SPI_QMSI_CS_GPIO))
+#error "This sample requires the GPIO pin as Chip Select feature"
+#endif
+
+#if defined(CONFIG_SPI_QMSI_PORT_0_DRV_NAME)
+#define SPI_PORT_0 CONFIG_SPI_QMSI_PORT_0_DRV_NAME
+#elif defined(CONFIG_SPI_DW_PORT_0_DRV_NAME)
+#define SPI_PORT_0 CONFIG_SPI_DW_PORT_0_DRV_NAME
+#else
+#error "Unknown SPI driver implementation"
+#endif
+
+#define W25Q80BL_MANUFACTURER_ID 0x90
+
+static uint8_t rx_buffer[6], tx_buffer[6];
+
+int w25q80bl_read_id(struct device *dev, uint8_t *manufacturer, uint8_t *deviceid)
+{
+	int err;
+
+	tx_buffer[0] = W25Q80BL_MANUFACTURER_ID;
+
+	err = spi_transceive(dev, tx_buffer, sizeof(tx_buffer),
+			     rx_buffer, sizeof(rx_buffer));
+	if (err) {
+		printk("Error during SPI transfer\n");
+		return DEV_FAIL;
+	}
+
+	if (manufacturer)
+		*manufacturer = rx_buffer[4];
+
+	if (deviceid)
+		*deviceid = rx_buffer[5];
+
+	return 0;
+}
+
+int main(void)
+{
+	struct spi_config config = { 0 };
+	struct device *spi_mst_0 = device_get_binding(SPI_PORT_0);
+	uint8_t manufacturer, device_id;
+	int err;
+
+	printk("SPI Example application\n");
+
+	if (!spi_mst_0)
+		return DEV_FAIL;
+
+	config.config = SPI_MODE_CPOL | SPI_MODE_CPHA | SPI_WORD(8);
+	config.max_sys_freq = 256;
+
+	err = spi_configure(spi_mst_0, &config);
+	if (err) {
+		printk("Could not configure SPI device\n");
+		return DEV_FAIL;
+	}
+
+	err = spi_slave_select(spi_mst_0, 1);
+	if (err) {
+		printk("Could not select SPI slave\n");
+		return DEV_FAIL;
+	}
+
+	err = w25q80bl_read_id(spi_mst_0, &manufacturer, &device_id);
+	if (err) {
+		printk("Could not get Manufacturer and Device ID from SPI Flash\n");
+		return DEV_FAIL;
+	}
+
+	printk("SPI Flash Manufacturer %x Device Id %x\n", manufacturer, device_id);
+
+	return DEV_OK;
+}