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add const attribute to the ops. 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1937 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
bernard.xiong@gmail.com 2012-02-03 14:03:51 +00:00
parent f756b2584c
commit eedd490bd6
2 changed files with 21 additions and 5 deletions
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24
components/drivers/include/drivers/spi.h
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@ -3,11 +3,27 @@
#include <rtthread.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_CPHA (1<<0) /* bit[0]:CPHA, clock phase */
#define RT_SPI_CPOL (1<<1) /* bit[1]:CPOL, clock polarity */
/**
* At CPOL=0 the base value of the clock is zero
* - For CPHA=0, data are captured on the clock's rising edge (low¡úhigh transition)
* and data are propagated on a falling edge (high¡úlow clock transition).
* - For CPHA=1, data are captured on the clock's falling edge and data are
* propagated on a rising edge.
* At CPOL=1 the base value of the clock is one (inversion of CPOL=0)
* - For CPHA=0, data are captured on clock's falling edge and data are propagated
* on a rising edge.
* - For CPHA=1, data are captured on clock's rising edge and data are propagated
* on a falling edge.
*/
#define RT_SPI_LSB (0<<2) /* bit[2]: 0-LSB */ #define RT_SPI_LSB (0<<2) /* bit[2]: 0-LSB */
#define RT_SPI_MSB (1<<2) /* bit[2]: 1-MSB */ #define RT_SPI_MSB (1<<2) /* bit[2]: 1-MSB */
#define RT_SPI_MASTER (0<<3) /* SPI master device */
#define RT_SPI_SLAVE (1<<3) /* SPI slave device */
#define RT_SPI_MODE_0 (0 | 0) /* CPOL = 0, CPHA = 0 */ #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_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_2 (RT_SPI_CPOL | 0) /* CPOL = 1, CPHA = 0 */
@ -44,7 +60,7 @@ struct rt_spi_ops;
struct rt_spi_bus struct rt_spi_bus
{ {
struct rt_device parent; struct rt_device parent;
struct rt_spi_ops *ops; const struct rt_spi_ops *ops;
struct rt_mutex lock; struct rt_mutex lock;
struct rt_spi_device* owner; struct rt_spi_device* owner;
@ -72,7 +88,7 @@ struct rt_spi_device
#define SPI_DEVICE(dev) ((struct rt_spi_device*)(dev)) #define SPI_DEVICE(dev) ((struct rt_spi_device*)(dev))
/* register a SPI bus */ /* register a SPI bus */
rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, struct rt_spi_ops* ops); rt_err_t rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, const struct rt_spi_ops* ops);
/* attach a device on SPI bus */ /* 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); 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 */ /* set configuration on SPI device */

2
components/drivers/spi/spi_core.c
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@ -3,7 +3,7 @@
extern rt_err_t rt_spi_bus_device_init(struct rt_spi_bus* bus, const char* name); 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); 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 rt_spi_bus_register(struct rt_spi_bus* bus, const char* name, const struct rt_spi_ops* ops)
{ {
rt_err_t result; rt_err_t result;