diff options
| -rw-r--r-- | components/drivers/include/drivers/spi.h | 117 | ||||
| -rw-r--r-- | components/drivers/spi/spi_core.c | 263 | ||||
| -rw-r--r-- | components/drivers/spi/spi_dev.c | 149 |
3 files changed, 529 insertions, 0 deletions
diff --git a/components/drivers/include/drivers/spi.h b/components/drivers/include/drivers/spi.h new file mode 100644 index 0000000000..d7aad13c64 --- /dev/null +++ b/components/drivers/include/drivers/spi.h @@ -0,0 +1,117 @@ +#ifndef __SPI_H__
+#define __SPI_H__
+
+#include <rtthread.h>
+
+#define RT_SPI_CPHA (1<<0) /* bit[0]:CPHA */
+#define RT_SPI_CPOL (1<<1) /* bit[1]:CPOL */
+#define RT_SPI_LSB (0<<2) /* bit[2]: 0-LSB */
+#define RT_SPI_MSB (1<<2) /* bit[2]: 1-MSB */
+
+#define RT_SPI_MODE_0 (0 | 0) /* CPOL = 0, CPHA = 0 */
+#define RT_SPI_MODE_1 (0 | RT_SPI_CPHA) /* CPOL = 0, CPHA = 1 */
+#define RT_SPI_MODE_2 (RT_SPI_CPOL | 0) /* CPOL = 1, CPHA = 0 */
+#define RT_SPI_MODE_3 (RT_SPI_CPOL | RT_SPI_CPHA) /* CPOL = 1, CPHA = 1 */
+
+#define RT_SPI_MODE_MASK (RT_SPI_CPHA | RT_SPI_CPOL | RT_SPI_MSB)
+
+/**
+ * SPI message structure
+ */
+struct rt_spi_message
+{
+ const void* send_buf;
+ void* recv_buf;
+ rt_size_t length;
+
+ unsigned cs_take:1;
+ unsigned cs_release:1;
+};
+
+/**
+ * SPI configuration structure
+ */
+struct rt_spi_configuration
+{
+ rt_uint8_t mode;
+ rt_uint8_t data_width;
+ rt_uint16_t reserved;
+
+ rt_uint32_t max_hz;
+};
+
+struct rt_spi_ops;
+struct rt_spi_bus
+{
+ struct rt_device parent;
+ struct rt_spi_ops *ops;
+
+ struct rt_mutex lock;
+ struct rt_spi_device* owner;
+};
+
+/**
+ * SPI operators
+ */
+struct rt_spi_ops
+{
+ rt_err_t (*configure)(struct rt_spi_device* device, struct rt_spi_configuration* configuration);
+ rt_uint32_t (*xfer)(struct rt_spi_device* device, struct rt_spi_message* message);
+};
+
+/**
+ * SPI Virtual BUS, one device must connected to a virtual BUS
+ */
+struct rt_spi_device
+{
+ struct rt_device parent;
+ struct rt_spi_bus *bus;
+
+ struct rt_spi_configuration config;
+};
+#define SPI_DEVICE(dev) ((struct rt_spi_device*)(dev))
+
+/* register a SPI bus */
+rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops);
+/* attach a device on SPI bus */
+rt_err_t rt_spi_bus_attach_device(struct rt_spi_device* device, const char* name, const char* bus_name, void* user_data);
+/* set configuration on SPI device */
+rt_err_t rt_spi_configure(struct rt_spi_device* device, struct rt_spi_configuration* cfg);
+
+/* send data then receive data from SPI devicew */
+rt_err_t rt_spi_send_then_recv(struct rt_spi_device* device, const void *send_buf, rt_size_t send_length,
+ void* recv_buf, rt_size_t recv_length);
+
+rt_err_t rt_spi_send_then_send(struct rt_spi_device* device, const void *send_buf1, rt_size_t send_length1,
+ const void* send_buf2, rt_size_t send_length2);
+
+rt_size_t rt_spi_transfer(struct rt_spi_device* device, const void *send_buf,
+ void* recv_buf, rt_size_t length);
+
+rt_inline rt_size_t rt_spi_recv(struct rt_spi_device* device, void* recv_buf, rt_size_t length)
+{
+ return rt_spi_transfer(device, RT_NULL, recv_buf, length);
+}
+
+rt_inline rt_size_t rt_spi_send(struct rt_spi_device* device, const void* send_buf, rt_size_t length)
+{
+ return rt_spi_transfer(device, send_buf, RT_NULL, length);
+}
+
+rt_inline rt_uint8_t rt_spi_sendrecv8(struct rt_spi_device* device, rt_uint8_t data)
+{
+ rt_uint8_t value;
+
+ rt_spi_send_then_recv(device, &data, 1, &value, 1);
+ return value;
+}
+
+rt_inline rt_uint16_t rt_spi_sendrecv16(struct rt_spi_device* device, rt_uint16_t data)
+{
+ rt_uint16_t value;
+
+ rt_spi_send_then_recv(device, &data, 2, &value, 2);
+ return value;
+}
+
+#endif
diff --git a/components/drivers/spi/spi_core.c b/components/drivers/spi/spi_core.c new file mode 100644 index 0000000000..d4c265da6d --- /dev/null +++ b/components/drivers/spi/spi_core.c @@ -0,0 +1,263 @@ +#include <drivers/spi.h>
+
+extern rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name);
+extern rt_err_t rt_spidev_device_init(struct rt_spi_device* dev, const char* name);
+
+rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops)
+{
+ rt_err_t result;
+
+ result = rt_spi_bus_device_init(bus, name);
+ if (result != RT_EOK) return result;
+
+ /* initialize mutex lock */
+ rt_mutex_init(&(bus->lock), name, RT_IPC_FLAG_FIFO);
+ /* set ops */
+ bus->ops = ops;
+ /* initialize owner */
+ bus->owner = RT_NULL;
+
+ return RT_EOK;
+}
+
+rt_err_t rt_spi_bus_attach_device(struct rt_spi_device* device, const char* name, const char* bus_name, void* user_data)
+{
+ rt_device_t bus;
+
+ /* get physical spi bus */
+ bus = rt_device_find(bus_name);
+ if (bus != RT_NULL && bus->type == RT_Device_Class_SPIBUS)
+ {
+ device->bus = (struct rt_spi_bus*)bus;
+
+ /* initialize spidev device */
+ rt_spidev_device_init(device, name);
+ rt_memset(&device->config, 0, sizeof(device->config));
+ device->parent.user_data = user_data;
+ }
+
+ /* not found the host bus */
+ return -RT_ERROR;
+}
+
+rt_err_t rt_spi_configure(struct rt_spi_device* device, struct rt_spi_configuration* cfg)
+{
+ rt_err_t result;
+
+ RT_ASSERT(device != RT_NULL);
+
+ /* set configuration */
+ device->config.data_width = cfg->data_width;
+ device->config.mode = cfg->mode & RT_SPI_MODE_MASK ;
+ device->config.max_hz = cfg->max_hz ;
+
+ if (device->bus != RT_NULL)
+ {
+ result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
+ if (result == RT_EOK)
+ {
+ if (device->bus->owner == device)
+ {
+ device->bus->ops->configure(device, &device->config);
+ }
+
+ /* release lock */
+ rt_mutex_release(&(device->bus->lock));
+ }
+ }
+
+ return RT_EOK;
+}
+
+rt_err_t rt_spi_send_then_send(struct rt_spi_device* device, const void *send_buf1, rt_size_t send_length1,
+ const void* send_buf2, rt_size_t send_length2)
+{
+ rt_err_t result;
+ struct rt_spi_message message;
+
+ RT_ASSERT(device != RT_NULL);
+ RT_ASSERT(device->bus != RT_NULL);
+
+ result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
+ if (result == RT_EOK)
+ {
+ if (device->bus->owner != device)
+ {
+ /* not the same owner as current, re-configure SPI bus */
+ result = device->bus->ops->configure(device, &device->config);
+ if (result == RT_EOK)
+ {
+ /* set SPI bus owner */
+ device->bus->owner = device;
+ }
+ else
+ {
+ /* configure SPI bus failed */
+ result = -RT_EIO;
+ goto __exit;
+ }
+ }
+
+ /* send data1 */
+ message.send_buf = send_buf1;
+ message.recv_buf = RT_NULL;
+ message.length = send_length1;
+ message.cs_take = 1;
+ message.cs_release = 0;
+
+ result = device->bus->ops->xfer(device, &message);
+ if (result == 0)
+ {
+ result = -RT_EIO;
+ goto __exit;
+ }
+
+ /* send data2 */
+ message.send_buf = send_buf2;
+ message.recv_buf = RT_NULL;
+ message.length = send_length2;
+ message.cs_take = 0;
+ message.cs_release = 1;
+
+ result = device->bus->ops->xfer(device, &message);
+ if (result == 0)
+ {
+ result = -RT_EIO;
+ goto __exit;
+ }
+
+ result = RT_EOK;
+ }
+ else
+ {
+ return -RT_EIO;
+ }
+
+__exit:
+ rt_mutex_release(&(device->bus->lock));
+ return result;
+}
+
+rt_err_t rt_spi_send_then_recv(struct rt_spi_device* device, const void *send_buf, rt_size_t send_length,
+ void* recv_buf, rt_size_t recv_length)
+{
+ rt_err_t result;
+ struct rt_spi_message message;
+
+ RT_ASSERT(device != RT_NULL);
+ RT_ASSERT(device->bus != RT_NULL);
+
+ result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
+ if (result == RT_EOK)
+ {
+ if (device->bus->owner != device)
+ {
+ /* not the same owner as current, re-configure SPI bus */
+ result = device->bus->ops->configure(device, &device->config);
+ if (result == RT_EOK)
+ {
+ /* set SPI bus owner */
+ device->bus->owner = device;
+ }
+ else
+ {
+ /* configure SPI bus failed */
+ result = -RT_EIO;
+ goto __exit;
+ }
+ }
+
+ /* send data */
+ message.send_buf = send_buf;
+ message.recv_buf = RT_NULL;
+ message.length = send_length;
+ message.cs_take = 1;
+ message.cs_release = 0;
+
+ result = device->bus->ops->xfer(device, &message);
+ if (result == 0)
+ {
+ result = -RT_EIO;
+ goto __exit;
+ }
+
+ /* recv data */
+ message.send_buf = RT_NULL;
+ message.recv_buf = recv_buf;
+ message.length = recv_length;
+ message.cs_take = 0;
+ message.cs_release = 1;
+
+ result = device->bus->ops->xfer(device, &message);
+ if (result == 0)
+ {
+ result = -RT_EIO;
+ goto __exit;
+ }
+
+ result = RT_EOK;
+ }
+ else
+ {
+ return -RT_EIO;
+ }
+
+__exit:
+ rt_mutex_release(&(device->bus->lock));
+ return result;
+}
+
+rt_size_t rt_spi_transfer(struct rt_spi_device* device, const void *send_buf,
+ void* recv_buf, rt_size_t length)
+{
+ rt_err_t result;
+ struct rt_spi_message message;
+
+ RT_ASSERT(device != RT_NULL);
+ RT_ASSERT(device->bus != RT_NULL);
+
+ result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
+ if (result == RT_EOK)
+ {
+ if (device->bus->owner != device)
+ {
+ /* not the same owner as current, re-configure SPI bus */
+ result = device->bus->ops->configure(device, &device->config);
+ if (result == RT_EOK)
+ {
+ /* set SPI bus owner */
+ device->bus->owner = device;
+ }
+ else
+ {
+ /* configure SPI bus failed */
+ rt_set_errno(-RT_EIO);
+ result = 0;
+ goto __exit;
+ }
+ }
+
+ /* initial message */
+ message.send_buf = send_buf;
+ message.recv_buf = recv_buf;
+ message.length = length;
+ message.cs_take = message.cs_release = 1;
+
+ /* transfer message */
+ result = device->bus->ops->xfer(device, &message);
+ if (result == 0)
+ {
+ rt_set_errno(-RT_EIO);
+ goto __exit;
+ }
+ }
+ else
+ {
+ rt_set_errno(-RT_EIO);
+ return 0;
+ }
+
+__exit:
+ rt_mutex_release(&(device->bus->lock));
+ return result;
+}
diff --git a/components/drivers/spi/spi_dev.c b/components/drivers/spi/spi_dev.c new file mode 100644 index 0000000000..afb17dafde --- /dev/null +++ b/components/drivers/spi/spi_dev.c @@ -0,0 +1,149 @@ +#include <rtthread.h>
+#include <drivers/spi.h>
+
+/* SPI bus device interface, compatible with RT-Thread 0.3.x/1.0.x */
+static rt_err_t _spi_bus_device_init(rt_device_t dev)
+{
+ struct rt_spi_bus* bus;
+
+ bus = (struct rt_spi_bus*) dev;
+ RT_ASSERT(bus != RT_NULL);
+
+ return RT_EOK;
+}
+
+static rt_size_t _spi_bus_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+{
+ struct rt_spi_bus* bus;
+
+ bus = (struct rt_spi_bus*) dev;
+ RT_ASSERT(bus != RT_NULL);
+ RT_ASSERT(bus->owner != RT_NULL);
+
+ return rt_spi_transfer(bus->owner, RT_NULL, buffer, size);
+}
+
+static rt_size_t _spi_bus_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+{
+ struct rt_spi_bus* bus;
+
+ bus = (struct rt_spi_bus*) dev;
+ RT_ASSERT(bus != RT_NULL);
+ RT_ASSERT(bus->owner != RT_NULL);
+
+ return rt_spi_transfer(bus->owner, buffer, RT_NULL, size);
+}
+
+static rt_err_t _spi_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+{
+ struct rt_spi_bus* bus;
+
+ bus = (struct rt_spi_bus*) dev;
+ RT_ASSERT(bus != RT_NULL);
+
+ switch (cmd)
+ {
+ case 0: /* set device */
+ break;
+ case 1:
+ break;
+ }
+
+ return RT_EOK;
+}
+
+rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name)
+{
+ struct rt_device *device;
+ RT_ASSERT(bus != RT_NULL);
+
+ device = &bus->parent;
+
+ /* set device type */
+ device->type = RT_Device_Class_SPIBUS;
+ /* initialize device interface */
+ device->init = _spi_bus_device_init;
+ device->open = RT_NULL;
+ device->close = RT_NULL;
+ device->read = _spi_bus_device_read;
+ device->write = _spi_bus_device_write;
+ device->control = _spi_bus_device_control;
+
+ /* register to device manager */
+ rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
+
+ return RT_EOK;
+}
+
+/* SPI Dev device interface, compatible with RT-Thread 0.3.x/1.0.x */
+static rt_err_t _spidev_device_init(rt_device_t dev)
+{
+ struct rt_spi_device* device;
+
+ device = (struct rt_spi_device*) dev;
+ RT_ASSERT(device != RT_NULL);
+
+ return RT_EOK;
+}
+
+static rt_size_t _spidev_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
+{
+ struct rt_spi_device* device;
+
+ device = (struct rt_spi_device*) dev;
+ RT_ASSERT(device != RT_NULL);
+ RT_ASSERT(device->bus != RT_NULL);
+
+ return rt_spi_transfer(device, RT_NULL, buffer, size);
+}
+
+static rt_size_t _spidev_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
+{
+ struct rt_spi_device* device;
+
+ device = (struct rt_spi_device*) dev;
+ RT_ASSERT(device != RT_NULL);
+ RT_ASSERT(device->bus != RT_NULL);
+
+ return rt_spi_transfer(device, buffer, RT_NULL, size);
+}
+
+static rt_err_t _spidev_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
+{
+ struct rt_spi_device* device;
+
+ device = (struct rt_spi_device*) dev;
+ RT_ASSERT(device != RT_NULL);
+
+ switch (cmd)
+ {
+ case 0: /* set device */
+ break;
+ case 1:
+ break;
+ }
+
+ return RT_EOK;
+}
+
+rt_err_t rt_spidev_device_init(struct rt_spi_device* dev, const char* name)
+{
+ struct rt_device* device;
+ RT_ASSERT(device != RT_NULL);
+
+ device = &(dev->parent);
+
+ /* set device type */
+ device->type = RT_Device_Class_SPIDevice;
+ device->init = _spidev_device_init;
+ device->open = RT_NULL;
+ device->close = RT_NULL;
+ device->read = _spidev_device_read;
+ device->write = _spidev_device_write;
+ device->control = _spidev_device_control;
+
+ /* register to device manager */
+ rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
+
+ return RT_EOK;
+}
|