add SPI framework.
git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1911 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong@gmail.com
parent
5588bbe4d2
commit
2b8c20af4b
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@ -0,0 +1,117 @@
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#ifndef __SPI_H__
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#define __SPI_H__
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#include <rtthread.h>
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#define RT_SPI_CPHA (1<<0) /* bit[0]:CPHA */
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#define RT_SPI_CPOL (1<<1) /* bit[1]:CPOL */
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#define RT_SPI_LSB (0<<2) /* bit[2]: 0-LSB */
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#define RT_SPI_MSB (1<<2) /* bit[2]: 1-MSB */
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#define RT_SPI_MODE_0 (0 | 0) /* CPOL = 0, CPHA = 0 */
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#define RT_SPI_MODE_1 (0 | RT_SPI_CPHA) /* CPOL = 0, CPHA = 1 */
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#define RT_SPI_MODE_2 (RT_SPI_CPOL | 0) /* CPOL = 1, CPHA = 0 */
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#define RT_SPI_MODE_3 (RT_SPI_CPOL | RT_SPI_CPHA) /* CPOL = 1, CPHA = 1 */
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#define RT_SPI_MODE_MASK (RT_SPI_CPHA | RT_SPI_CPOL | RT_SPI_MSB)
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/**
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* SPI message structure
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*/
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struct rt_spi_message
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{
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const void* send_buf;
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void* recv_buf;
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rt_size_t length;
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unsigned cs_take:1;
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unsigned cs_release:1;
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};
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/**
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* SPI configuration structure
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*/
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struct rt_spi_configuration
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{
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rt_uint8_t mode;
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rt_uint8_t data_width;
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rt_uint16_t reserved;
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rt_uint32_t max_hz;
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};
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struct rt_spi_ops;
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struct rt_spi_bus
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{
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struct rt_device parent;
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struct rt_spi_ops *ops;
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struct rt_mutex lock;
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struct rt_spi_device* owner;
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};
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/**
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* SPI operators
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*/
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struct rt_spi_ops
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{
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rt_err_t (*configure)(struct rt_spi_device* device, struct rt_spi_configuration* configuration);
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rt_uint32_t (*xfer)(struct rt_spi_device* device, struct rt_spi_message* message);
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};
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/**
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* SPI Virtual BUS, one device must connected to a virtual BUS
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*/
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struct rt_spi_device
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{
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struct rt_device parent;
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struct rt_spi_bus *bus;
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struct rt_spi_configuration config;
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};
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#define SPI_DEVICE(dev) ((struct rt_spi_device*)(dev))
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/* register a SPI bus */
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rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops);
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/* attach a device on SPI bus */
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rt_err_t rt_spi_bus_attach_device(struct rt_spi_device* device, const char* name, const char* bus_name, void* user_data);
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/* set configuration on SPI device */
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rt_err_t rt_spi_configure(struct rt_spi_device* device, struct rt_spi_configuration* cfg);
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/* send data then receive data from SPI devicew */
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rt_err_t rt_spi_send_then_recv(struct rt_spi_device* device, const void *send_buf, rt_size_t send_length,
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void* recv_buf, rt_size_t recv_length);
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rt_err_t rt_spi_send_then_send(struct rt_spi_device* device, const void *send_buf1, rt_size_t send_length1,
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const void* send_buf2, rt_size_t send_length2);
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rt_size_t rt_spi_transfer(struct rt_spi_device* device, const void *send_buf,
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void* recv_buf, rt_size_t length);
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rt_inline rt_size_t rt_spi_recv(struct rt_spi_device* device, void* recv_buf, rt_size_t length)
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{
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return rt_spi_transfer(device, RT_NULL, recv_buf, length);
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}
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rt_inline rt_size_t rt_spi_send(struct rt_spi_device* device, const void* send_buf, rt_size_t length)
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{
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return rt_spi_transfer(device, send_buf, RT_NULL, length);
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}
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rt_inline rt_uint8_t rt_spi_sendrecv8(struct rt_spi_device* device, rt_uint8_t data)
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{
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rt_uint8_t value;
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rt_spi_send_then_recv(device, &data, 1, &value, 1);
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return value;
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}
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rt_inline rt_uint16_t rt_spi_sendrecv16(struct rt_spi_device* device, rt_uint16_t data)
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{
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rt_uint16_t value;
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rt_spi_send_then_recv(device, &data, 2, &value, 2);
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return value;
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}
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#endif
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@ -0,0 +1,263 @@
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#include <drivers/spi.h>
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extern rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name);
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extern rt_err_t rt_spidev_device_init(struct rt_spi_device* dev, const char* name);
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rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops)
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{
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rt_err_t result;
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result = rt_spi_bus_device_init(bus, name);
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if (result != RT_EOK) return result;
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/* initialize mutex lock */
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rt_mutex_init(&(bus->lock), name, RT_IPC_FLAG_FIFO);
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/* set ops */
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bus->ops = ops;
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/* initialize owner */
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bus->owner = RT_NULL;
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return RT_EOK;
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}
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rt_err_t rt_spi_bus_attach_device(struct rt_spi_device* device, const char* name, const char* bus_name, void* user_data)
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{
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rt_device_t bus;
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/* get physical spi bus */
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bus = rt_device_find(bus_name);
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if (bus != RT_NULL && bus->type == RT_Device_Class_SPIBUS)
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{
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device->bus = (struct rt_spi_bus*)bus;
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/* initialize spidev device */
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rt_spidev_device_init(device, name);
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rt_memset(&device->config, 0, sizeof(device->config));
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device->parent.user_data = user_data;
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}
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/* not found the host bus */
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return -RT_ERROR;
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}
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rt_err_t rt_spi_configure(struct rt_spi_device* device, struct rt_spi_configuration* cfg)
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{
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rt_err_t result;
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RT_ASSERT(device != RT_NULL);
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/* set configuration */
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device->config.data_width = cfg->data_width;
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device->config.mode = cfg->mode & RT_SPI_MODE_MASK ;
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device->config.max_hz = cfg->max_hz ;
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if (device->bus != RT_NULL)
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{
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner == device)
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{
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device->bus->ops->configure(device, &device->config);
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}
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/* release lock */
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rt_mutex_release(&(device->bus->lock));
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}
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}
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return RT_EOK;
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}
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rt_err_t rt_spi_send_then_send(struct rt_spi_device* device, const void *send_buf1, rt_size_t send_length1,
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const void* send_buf2, rt_size_t send_length2)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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result = -RT_EIO;
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goto __exit;
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}
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}
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/* send data1 */
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message.send_buf = send_buf1;
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message.recv_buf = RT_NULL;
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message.length = send_length1;
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message.cs_take = 1;
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message.cs_release = 0;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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/* send data2 */
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message.send_buf = send_buf2;
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message.recv_buf = RT_NULL;
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message.length = send_length2;
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message.cs_take = 0;
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message.cs_release = 1;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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result = RT_EOK;
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}
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else
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{
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return -RT_EIO;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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rt_err_t rt_spi_send_then_recv(struct rt_spi_device* device, const void *send_buf, rt_size_t send_length,
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void* recv_buf, rt_size_t recv_length)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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result = -RT_EIO;
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goto __exit;
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}
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}
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/* send data */
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message.send_buf = send_buf;
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message.recv_buf = RT_NULL;
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message.length = send_length;
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message.cs_take = 1;
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message.cs_release = 0;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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/* recv data */
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message.send_buf = RT_NULL;
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message.recv_buf = recv_buf;
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message.length = recv_length;
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message.cs_take = 0;
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message.cs_release = 1;
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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result = -RT_EIO;
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goto __exit;
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}
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result = RT_EOK;
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}
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else
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{
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return -RT_EIO;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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rt_size_t rt_spi_transfer(struct rt_spi_device* device, const void *send_buf,
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void* recv_buf, rt_size_t length)
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{
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rt_err_t result;
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struct rt_spi_message message;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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result = rt_mutex_take(&(device->bus->lock), RT_WAITING_FOREVER);
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if (result == RT_EOK)
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{
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if (device->bus->owner != device)
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{
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/* not the same owner as current, re-configure SPI bus */
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result = device->bus->ops->configure(device, &device->config);
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if (result == RT_EOK)
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{
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/* set SPI bus owner */
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device->bus->owner = device;
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}
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else
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{
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/* configure SPI bus failed */
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rt_set_errno(-RT_EIO);
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result = 0;
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goto __exit;
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}
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}
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/* initial message */
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message.send_buf = send_buf;
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message.recv_buf = recv_buf;
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message.length = length;
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message.cs_take = message.cs_release = 1;
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/* transfer message */
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result = device->bus->ops->xfer(device, &message);
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if (result == 0)
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{
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rt_set_errno(-RT_EIO);
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goto __exit;
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}
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}
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else
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{
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rt_set_errno(-RT_EIO);
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return 0;
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}
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__exit:
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rt_mutex_release(&(device->bus->lock));
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return result;
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}
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@ -0,0 +1,149 @@
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#include <rtthread.h>
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#include <drivers/spi.h>
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/* SPI bus device interface, compatible with RT-Thread 0.3.x/1.0.x */
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static rt_err_t _spi_bus_device_init(rt_device_t dev)
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{
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struct rt_spi_bus* bus;
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bus = (struct rt_spi_bus*) dev;
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RT_ASSERT(bus != RT_NULL);
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return RT_EOK;
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}
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static rt_size_t _spi_bus_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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struct rt_spi_bus* bus;
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bus = (struct rt_spi_bus*) dev;
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RT_ASSERT(bus != RT_NULL);
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RT_ASSERT(bus->owner != RT_NULL);
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return rt_spi_transfer(bus->owner, RT_NULL, buffer, size);
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}
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static rt_size_t _spi_bus_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
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{
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struct rt_spi_bus* bus;
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bus = (struct rt_spi_bus*) dev;
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RT_ASSERT(bus != RT_NULL);
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RT_ASSERT(bus->owner != RT_NULL);
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return rt_spi_transfer(bus->owner, buffer, RT_NULL, size);
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}
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static rt_err_t _spi_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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struct rt_spi_bus* bus;
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bus = (struct rt_spi_bus*) dev;
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RT_ASSERT(bus != RT_NULL);
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switch (cmd)
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{
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case 0: /* set device */
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break;
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case 1:
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break;
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}
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return RT_EOK;
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}
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rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name)
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{
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struct rt_device *device;
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RT_ASSERT(bus != RT_NULL);
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device = &bus->parent;
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/* set device type */
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device->type = RT_Device_Class_SPIBUS;
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/* initialize device interface */
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device->init = _spi_bus_device_init;
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device->open = RT_NULL;
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device->close = RT_NULL;
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device->read = _spi_bus_device_read;
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device->write = _spi_bus_device_write;
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device->control = _spi_bus_device_control;
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/* register to device manager */
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rt_device_register(device, name, RT_DEVICE_FLAG_RDWR);
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return RT_EOK;
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}
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/* SPI Dev device interface, compatible with RT-Thread 0.3.x/1.0.x */
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static rt_err_t _spidev_device_init(rt_device_t dev)
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{
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struct rt_spi_device* device;
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device = (struct rt_spi_device*) dev;
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RT_ASSERT(device != RT_NULL);
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return RT_EOK;
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}
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static rt_size_t _spidev_device_read(rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t size)
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{
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struct rt_spi_device* device;
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device = (struct rt_spi_device*) dev;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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return rt_spi_transfer(device, RT_NULL, buffer, size);
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}
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static rt_size_t _spidev_device_write(rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size)
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{
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struct rt_spi_device* device;
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device = (struct rt_spi_device*) dev;
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RT_ASSERT(device != RT_NULL);
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RT_ASSERT(device->bus != RT_NULL);
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return rt_spi_transfer(device, buffer, RT_NULL, size);
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}
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static rt_err_t _spidev_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
|
||||
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;
|
||||
}
|
||||
Loading…
Reference in New Issue