dianjixz
12 KiB
DeviceDriver
Device driver for Linux platform, including various small sensors and actuators, along with application-level programs.
.
├── SConstruct
├── include
├── Kconfig
├── party
│ ├── framebuffer
│ │ ├── fbtools.c
│ │ └── fbtools.h
│ ├── linux_i2c
│ │ ├── linuxi2c.c
│ │ └── linuxi2c.h
│ ├── linux_spi
│ │ ├── linux_spi.c
│ │ └── linux_spi.h
│ ├── linux_uart
│ │ ├── linux_uart.c
│ │ └── linux_uart.h
│ └── ptmx
│ ├── ptmx_creat.c
│ └── ptmx_creat.h
linux_uart
A non-standard C library for Linux, used to read and write to serial devices under the /dev directory. It facilitates serial communication on Linux.
The library is located in components/DeviceDriver/party/linux_uart.
Activate the component.
Use the command make menuconfig to enable 'Enable DeviceDriver -> compile uart lib' and compile the UART library.
Permanently enable.
Add the following to the config_defaults.mk file in the project:
CONFIG_DEVICE_DRIVER_ENABLED=y
CONFIG_DEVICE_UART_ENABLED=y
Usage example: examples/linux_uart
API
typedef struct{
int baud; // UART baud rate.
int data_bits; // UART data bits.
int stop_bits; // UART stop bits.
char parity; // parity.
}uart_t;
/**
* @brief init uart
* @note
* @param [in] dev device name
* @param [in] param struct uart_t pointer
* @retval [return] [>0] fd index
* @retval [return] [<=0] fail code
*/
int linux_uart_init(char* dev, void* param);
/**
* @brief close uart
* @note
* @param [in] fd fd index
* @retval
*/
void linux_uart_deinit(int fd);
/**
* @brief Read data from UART.
* @note
* @param [in] fd fd index
* @param [in] cnt buff size
* @param [in] buf buff pointer
* @retval [return] [>0] The size of the read data.
* @retval [return] [<0] Read failure code.
*/
int linux_uart_read(int fd, int cnt, void* buf);
/**
* @brief Send data from UART.
* @note
* @param [in] fd fd index
* @param [in] cnt buff size
* @param [in] buf buff pointer
* @retval [return] [>0] The size of the sent data.
* @retval [return] [<0] Send failure code.
*/
int linux_uart_write(int fd, int cnt, void* buf);
linux_i2c
A non-standard C library for Linux, used to read and write to i2c devices under the /dev directory. It facilitates i2c communication on Linux.
The library is located in components/DeviceDriver/party/linux_i2c.
Activate the component.
Use the command make menuconfig to enable 'Enable DeviceDriver -> compile i2c lib' and compile the i2c library.
Permanently enable.
Add the following to the config_defaults.mk file in the project:
CONFIG_DEVICE_DRIVER_ENABLED=y
CONFIG_DEVICE_I2C_ENABLED=y
Usage example: examples/linux_i2c
API：
/* I2c device */
typedef struct i2c_device {
int bus; /* I2C Bus fd, return from i2c_open */
unsigned short addr; /* I2C device(slave) address */
unsigned char tenbit; /* I2C is 10 bit device address */
unsigned char delay; /* I2C internal operation delay, unit millisecond */
unsigned short flags; /* I2C i2c_ioctl_read/write flags */
unsigned int page_bytes; /* I2C max number of bytes per page, 1K/2K 8, 4K/8K/16K 16, 32K/64K 32 etc */
unsigned int iaddr_bytes; /* I2C device internal(word) address bytes, such as: 24C04 1 byte, 24C64 2 bytes */
} LINUXI2CDevice;
/* Close i2c bus */
void linuxi2c_close(int bus);
/*
** @brief : Open i2c bus
** #bus_name : i2c bus name such as: /dev/i2c-1
** @return : failed return -1, success return i2c bus fd
*/
int linuxi2c_open(const char *bus_name);
/*
** @brief : Initialize LINUXI2CDevice with defualt value
** #device : LINUXI2CDevice struct
*/
void linuxi2c_init_device(LINUXI2CDevice *device);
/*
** @brief : Get LINUXI2CDevice struct desc
** #device : LINUXI2CDevice struct
** #buf : Description message buffer
** #size : #buf size
** @return : return i2c device desc
*/
char *linuxi2c_get_device_desc(const LINUXI2CDevice *device, char *buf, size_t size);
/* Select i2c device on i2c bus */
int linuxi2c_select(int bus, unsigned long dev_addr, unsigned long tenbit);
/* I2C internal(word) address convert */
void linuxi2c_iaddr_convert(unsigned int int_addr, unsigned int iaddr_bytes, unsigned char *addr);
/* I2C file I/O read, write
** @brief : read #len bytes data from #device #iaddr to #buf
** #device : LINUXI2CDevice struct, must call i2c_device_init first
** #iaddr : i2c_device internal address will read data from this address, no address set zero
** #buf : i2c data will read to here
** #len : how many data to read, lenght must less than or equal to buf size
** @return : success return read data length, failed -1
*/
ssize_t linuxi2c_read(const LINUXI2CDevice *device, unsigned int iaddr, void *buf, size_t len);
ssize_t linuxi2c_write(const LINUXI2CDevice *device, unsigned int iaddr, const void *buf, size_t len);
/* I2c ioctl read, write can set i2c flags
** i2c_ioctl_read/write
** I2C bus top layer interface to operation different i2c devide
** This function will call XXX:ioctl system call and will be related
** i2c-dev.c i2cdev_ioctl to operation i2c device.
** 1. it can choice ignore or not ignore i2c bus ack signal (flags set I2C_M_IGNORE_NAK)
** 2. it can choice ignore or not ignore i2c internal address
**
*/
ssize_t linuxi2c_ioctl_read(const LINUXI2CDevice *device, unsigned int iaddr, void *buf, size_t len);
ssize_t linuxi2c_ioctl_write(const LINUXI2CDevice *device, unsigned int iaddr, const void *buf, size_t len);
/*
** i2c_primitive_read/write
** I2C bus top layer interface to operation different i2c devide
** This function will call XXX:primitive system call and will be related
** i2c-dev.c i2cdev_ioctl to operation i2c device.
** 1. it can choice ignore or not ignore i2c bus ack signal (flags set I2C_M_IGNORE_NAK)
** 2. it can choice ignore or not ignore i2c internal address
**
*/
ssize_t linuxi2c_primitive_read(const LINUXI2CDevice *device, void *offset, size_t offset_len, void *buf, size_t buf_len);
ssize_t linuxi2c_primitive_write(const LINUXI2CDevice *device, void *offset, size_t offset_len, void *buf, size_t buf_len);
linux_spi
A non-standard C library for Linux, used to read and write to spi devices under the /dev directory. It facilitates spi communication on Linux.
The library is located in components/DeviceDriver/party/linux_spi.
Activate the component.
Use the command make menuconfig to enable 'Enable DeviceDriver -> compile spi lib' and compile the i2c library.
Permanently enable.
Add the following to the config_defaults.mk file in the project:
CONFIG_DEVICE_DRIVER_ENABLED=y
CONFIG_DEVICE_SPI_ENABLED=y
Usage example: examples/linux_spi
API:
// open and init SPIdev
// * spi_mode may have next mask: SPI_LOOP | SPI_CPHA | SPI_CPOL |
// SPI_LSB_FIRST | SPI_CS_HIGH SPI_3WIRE | SPI_NO_CS | SPI_READY
// or 0 by zefault
int spi_init(spi_t *self,
const char *device, // filename like "/dev/spidev0.0"
int mode, // SPI_* (look "linux/spi/spidev.h")
int bits, // bits per word (usually 8)
int speed); // max speed [Hz]
//----------------------------------------------------------------------------
// sets mode on existing spi
int spi_set_mode(spi_t* self, int mode);
//----------------------------------------------------------------------------
// sets speed on existing spi
int spi_set_speed(spi_t* self, int speed);
//----------------------------------------------------------------------------
// close SPIdev file and free memory
void spi_free(spi_t *self);
//----------------------------------------------------------------------------
// read data from SPIdev
int spi_read(spi_t *self, void* rx_buf, int len);
//----------------------------------------------------------------------------
// write data to SPIdev
int spi_write(spi_t *self, const void* tx_buf, int len);
//----------------------------------------------------------------------------
// read and write `len` bytes from/to SPIdev
int spi_exchange(spi_t *self, void* rx_buf, const void* tx_buf, int len);
//----------------------------------------------------------------------------
// read data from SPIdev from specific register address
int spi_read_reg8(spi_t *self, uint8_t reg_addr, void* rx_buf, int len);
//----------------------------------------------------------------------------
// write data to SPIdev to specific register address
int spi_write_reg8(spi_t *self, uint8_t reg_addr, const void* tx_buf, int len);
framebuffer
A non-standard C library for Linux, used to read and write to framebuffer devices under the /dev directory. It facilitates framebuffer communication on Linux.
The library is located in components/DeviceDriver/party/framebuffer.
Activate the component.
Use the command make menuconfig to enable 'Enable DeviceDriver -> compile framebuffer lib' and compile the i2c library.
Permanently enable.
Add the following to the config_defaults.mk file in the project:
CONFIG_DEVICE_DRIVER_ENABLED=y
CONFIG_DEVICE_FRAMEBUFFER_ENABLED=y
Usage example: examples/linux_framebuffer
API:
/* a framebuffer device structure */
typedef struct fbdev{
int fb;
unsigned long fb_mem_offset;
unsigned long fb_mem;
struct fb_fix_screeninfo fb_fix;
struct fb_var_screeninfo fb_var;
char dev[20];
} FBDEV, *PFBDEV;
/* open & init a frame buffer */
/* to use this function,
you must set FBDEV.dev="/dev/fb0"
or "/dev/fbX" */
/* it's your frame buffer. */
int fb_open(PFBDEV pFbdev);
/*close a frame buffer*/
int fb_close(PFBDEV pFbdev);
/*get display depth*/
int get_display_depth(PFBDEV pFbdev);
/*draw rgb888 or rgb565 to framebuffer.color=24/16*/
void fb_draw_img(PFBDEV pFbdev, int w, int h, int color, void *buf);
void fb_put_pixel(PFBDEV pFbdev, int x, int y, unsigned int color);
/*full screen clear */
void fb_memset(void *addr, int c, size_t len);
ptmx
A non-standard C library for Linux, used to read and write to pts devices under the /dev directory. Standard input/output for linux virtual terminals to operate other processes. Useful in daemons.
The library is located in components/DeviceDriver/party/ptmx.
Activate the component.
Use the command make menuconfig to enable 'Enable DeviceDriver -> compile ptmx lib' and compile the i2c library.
Permanently enable.
Add the following to the config_defaults.mk file in the project:
CONFIG_DEVICE_DRIVER_ENABLED=y
CONFIG_DEVICE_PTMX_ENABLED=y
Usage example: examples/ptxm_tcp_tran
API：
typedef enum {
PTMX_STOP = 0,
PTMX_RUN = 1
} ptmx_status_t;
/*msg call back */
typedef void (*msg_call_back_t)(const char*, int);
/* a ptmx device structure */
struct ptmx_creat_t
{
int master_ptmx;
char slave_ptmx_name[50];
int ptmx_status;
pthread_t ptmx_loop_handler_d;
msg_call_back_t call;
int buff_size;
};
/*creat a ptmx struct ptmx_creat_t */
struct ptmx_creat_t* ptmx_creat();
/*destroy ptmx struct ptmx_creat_t */
int ptmx_destroy(struct ptmx_creat_t **p);
/*open one ptmx*/
int ptmx_open(struct ptmx_creat_t *self);
/*set msg callback fun*/
void ptmx_set_msg_callback(struct ptmx_creat_t *self, msg_call_back_t fun);
void *ptmx_loop_handler(void *par);
/*exit one ptmx*/
void ptmx_exit(struct ptmx_creat_t *self);
#ifdef __cplusplus
class ptmx
{
private:
struct ptmx_creat_t ptm;
public:
ptmx();
/*open ptmx*/
int open();
/*set ptmx read buff*/
void set_buff_size(int size);
/*set msg callback fun*/
void set_msg_call_back(msg_call_back_t msg);
std::string get_slave_ptmx_name();
void exit();
~ptmx();
};
#endif