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update I2C driver, which now just use small memory 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2159 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
luohui2320@gmail.com 2012-06-13 16:55:46 +00:00
parent c9250dc32c
commit 85169d7fe8
8 changed files with 172 additions and 479 deletions
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33
components/drivers/i2c/i2c-bit-ops.c
View File

@ -12,8 +12,7 @@
* 2012-04-25 weety first version * 2012-04-25 weety first version
*/ */
#include <i2c.h> #include <rtdevice.h>
#include <i2c-bit-ops.h>
#ifdef RT_I2C_BIT_DEBUG #ifdef RT_I2C_BIT_DEBUG
#define bit_dbg(fmt, ...) rt_kprintf(fmt, ##__VA_ARGS__) #define bit_dbg(fmt, ...) rt_kprintf(fmt, ##__VA_ARGS__)
@ -126,7 +125,7 @@ rt_inline rt_bool_t i2c_waitack(struct rt_i2c_bit_ops *ops)
return -RT_ETIMEOUT; return -RT_ETIMEOUT;
} }
ack = !GET_SDA(ops); /* ack : sda pin is pulled low */ ack = !GET_SDA(ops); /* ACK : SDA pin is pulled low */
bit_dbg("%s\n", ack ? "ACK" : "NACK"); bit_dbg("%s\n", ack ? "ACK" : "NACK");
SCL_L(ops); SCL_L(ops);
@ -135,7 +134,7 @@ rt_inline rt_bool_t i2c_waitack(struct rt_i2c_bit_ops *ops)
} }
static rt_int32_t i2c_writeb(struct rt_i2c_bus *bus, rt_uint8_t data) static rt_int32_t i2c_writeb(struct rt_i2c_bus_device *bus, rt_uint8_t data)
{ {
rt_int32_t i; rt_int32_t i;
rt_uint8_t bit; rt_uint8_t bit;
@ -151,7 +150,7 @@ static rt_int32_t i2c_writeb(struct rt_i2c_bus *bus, rt_uint8_t data)
if (SCL_H(ops) < 0) if (SCL_H(ops) < 0)
{ {
bit_dbg("i2c_writeb: 0x%02x, " bit_dbg("i2c_writeb: 0x%02x, "
"wait scl pin high timeout at bit #%d\n", "wait scl pin high timeout at bit %d\n",
data, i); data, i);
return -RT_ETIMEOUT; return -RT_ETIMEOUT;
} }
@ -164,7 +163,7 @@ static rt_int32_t i2c_writeb(struct rt_i2c_bus *bus, rt_uint8_t data)
} }
static rt_int32_t i2c_readb(struct rt_i2c_bus *bus) static rt_int32_t i2c_readb(struct rt_i2c_bus_device *bus)
{ {
rt_uint8_t i; rt_uint8_t i;
rt_uint8_t data = 0; rt_uint8_t data = 0;
@ -179,7 +178,7 @@ static rt_int32_t i2c_readb(struct rt_i2c_bus *bus)
if (SCL_H(ops) < 0) if (SCL_H(ops) < 0)
{ {
bit_dbg("i2c_readb: wait scl pin high " bit_dbg("i2c_readb: wait scl pin high "
"timeout at bit #%d\n", 7 - i); "timeout at bit %d\n", 7 - i);
return -RT_ETIMEOUT; return -RT_ETIMEOUT;
} }
@ -193,7 +192,7 @@ static rt_int32_t i2c_readb(struct rt_i2c_bus *bus)
} }
static rt_size_t i2c_send_bytes(struct rt_i2c_bus *bus, struct rt_i2c_msg *msg) static rt_size_t i2c_send_bytes(struct rt_i2c_bus_device *bus, struct rt_i2c_msg *msg)
{ {
rt_int32_t ret; rt_int32_t ret;
rt_size_t bytes = 0; rt_size_t bytes = 0;
@ -225,7 +224,7 @@ static rt_size_t i2c_send_bytes(struct rt_i2c_bus *bus, struct rt_i2c_msg *msg)
return bytes; return bytes;
} }
static rt_err_t i2c_send_ack_or_nack(struct rt_i2c_bus *bus, int ack) static rt_err_t i2c_send_ack_or_nack(struct rt_i2c_bus_device *bus, int ack)
{ {
struct rt_i2c_bit_ops *ops = bus->priv; struct rt_i2c_bit_ops *ops = bus->priv;
@ -241,7 +240,7 @@ static rt_err_t i2c_send_ack_or_nack(struct rt_i2c_bus *bus, int ack)
return RT_EOK; return RT_EOK;
} }
static rt_size_t i2c_recv_bytes(struct rt_i2c_bus *bus, struct rt_i2c_msg *msg) static rt_size_t i2c_recv_bytes(struct rt_i2c_bus_device *bus, struct rt_i2c_msg *msg)
{ {
rt_int32_t val; rt_int32_t val;
rt_int32_t bytes = 0; /* actual bytes */ rt_int32_t bytes = 0; /* actual bytes */
@ -279,7 +278,7 @@ static rt_size_t i2c_recv_bytes(struct rt_i2c_bus *bus, struct rt_i2c_msg *msg)
return bytes; return bytes;
} }
static rt_int32_t i2c_send_address(struct rt_i2c_bus *bus, static rt_int32_t i2c_send_address(struct rt_i2c_bus_device *bus,
rt_uint8_t addr, rt_int32_t retries) rt_uint8_t addr, rt_int32_t retries)
{ {
struct rt_i2c_bit_ops *ops = bus->priv; struct rt_i2c_bit_ops *ops = bus->priv;
@ -301,7 +300,7 @@ static rt_int32_t i2c_send_address(struct rt_i2c_bus *bus,
return ret; return ret;
} }
static rt_err_t i2c_bit_send_address(struct rt_i2c_bus *bus, struct rt_i2c_msg *msg) static rt_err_t i2c_bit_send_address(struct rt_i2c_bus_device *bus, struct rt_i2c_msg *msg)
{ {
rt_uint16_t flags = msg->flags; rt_uint16_t flags = msg->flags;
rt_uint16_t ignore_nack = msg->flags & RT_I2C_IGNORE_NACK; rt_uint16_t ignore_nack = msg->flags & RT_I2C_IGNORE_NACK;
@ -360,7 +359,7 @@ static rt_err_t i2c_bit_send_address(struct rt_i2c_bus *bus, struct rt_i2c_msg *
} }
static rt_size_t i2c_bit_xfer(struct rt_i2c_bus *bus, static rt_size_t i2c_bit_xfer(struct rt_i2c_bus_device *bus,
struct rt_i2c_msg msgs[], rt_uint32_t num) struct rt_i2c_msg msgs[], rt_uint32_t num)
{ {
struct rt_i2c_msg *msg; struct rt_i2c_msg *msg;
@ -383,7 +382,7 @@ static rt_size_t i2c_bit_xfer(struct rt_i2c_bus *bus,
ret = i2c_bit_send_address(bus, msg); ret = i2c_bit_send_address(bus, msg);
if ((ret != RT_EOK) && !ignore_nack) if ((ret != RT_EOK) && !ignore_nack)
{ {
bit_dbg("receive NACK from device addr 0x%02x msg #%d\n", bit_dbg("receive NACK from device addr 0x%02x msg %d\n",
msgs[i].addr, i); msgs[i].addr, i);
goto out; goto out;
} }
@ -425,14 +424,14 @@ out:
} }
static const struct rt_i2c_bus_ops i2c_bit_bus_ops = { static const struct rt_i2c_bus_device_ops i2c_bit_bus_ops = {
i2c_bit_xfer, i2c_bit_xfer,
RT_NULL, RT_NULL,
RT_NULL RT_NULL
}; };
rt_err_t rt_i2c_bit_add_bus(struct rt_i2c_bus *bus) rt_err_t rt_i2c_bit_add_bus(struct rt_i2c_bus_device *bus, const char *bus_name)
{ {
rt_err_t err; rt_err_t err;
@ -441,5 +440,5 @@ rt_err_t rt_i2c_bit_add_bus(struct rt_i2c_bus *bus)
bus->ops = &i2c_bit_bus_ops; bus->ops = &i2c_bit_bus_ops;
return rt_i2c_bus_register(bus); return rt_i2c_bus_device_register(bus, bus_name);
} }

117
components/drivers/i2c/i2c.h
View File

@ -1,117 +0,0 @@
/*
* File : i2c.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2012-04-25 weety first version
*/
#ifndef __I2C_H__
#define __I2C_H__
#include <rtthread.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef RT_I2C_NAME_SIZE
#define RT_I2C_NAME_SIZE 32
#endif
#define RT_I2C_WR 0x0000
#define RT_I2C_RD (1u << 0)
#define RT_I2C_ADDR_10BIT (1u << 2) /* this is a ten bit chip address */
#define RT_I2C_NO_START (1u << 4)
#define RT_I2C_IGNORE_NACK (1u << 5)
#define RT_I2C_NO_READ_ACK (1u << 6) /* when I2C reading, we do not ACK */
struct rt_i2c_msg {
rt_uint16_t addr;
rt_uint16_t flags;
rt_uint16_t len;
rt_uint8_t *buf;
};
struct rt_i2c_hardware_info {
char name[RT_I2C_NAME_SIZE];
rt_uint16_t flags;
rt_uint16_t addr;
rt_uint32_t bus_id;
rt_list_t list;
};
#define RT_I2C_HARDWARE_INFO(name, flags, addr, bus_id) \
name,flags,addr,bus_id,{RT_NULL,RT_NULL}
struct rt_i2c_bus;
struct rt_i2c_bus_ops {
rt_size_t (*master_xfer) (struct rt_i2c_bus *bus, struct rt_i2c_msg *msgs, rt_uint32_t num);
rt_size_t (*slave_xfer) (struct rt_i2c_bus *bus, struct rt_i2c_msg *msgs, rt_uint32_t num);
rt_err_t (*i2c_bus_control) (struct rt_i2c_bus *bus, rt_uint32_t, rt_uint32_t);
};
/*for i2c bus driver*/
struct rt_i2c_bus {
struct rt_device *parent;
char name[RT_I2C_NAME_SIZE];
rt_uint32_t id;
const struct rt_i2c_bus_ops *ops;
struct rt_mutex lock;
rt_list_t devices;
rt_list_t list;
rt_uint32_t timeout;
rt_uint32_t retries;
void *priv;
};
struct rt_i2c_device;
struct rt_i2c_driver {
char name[RT_I2C_NAME_SIZE];
rt_err_t (*probe)(struct rt_i2c_device *device);
rt_err_t (*remove)(struct rt_i2c_device *device);
rt_list_t devices;
};
/*for i2c device driver*/
struct rt_i2c_device {
rt_uint32_t flags;
rt_uint16_t addr;
struct rt_i2c_bus *bus;
struct rt_i2c_driver *driver;
struct rt_device dev;
rt_list_t drv_list;
rt_list_t bus_list;
};
#ifdef RT_I2C_DEBUG
#define i2c_dbg(fmt, ...) rt_kprintf(fmt, ##__VA_ARGS__)
#else
#define i2c_dbg(fmt, ...)
#endif
rt_err_t rt_i2c_bus_register(struct rt_i2c_bus *bus);
rt_err_t rt_i2c_bus_unregister(struct rt_i2c_bus *bus);
void rt_i2c_hw_info_register(struct rt_i2c_hardware_info *info, rt_uint32_t size);
rt_err_t rt_i2c_bus_attach_driver(struct rt_i2c_driver *driver);
rt_err_t rt_i2c_bus_detach_driver(struct rt_i2c_driver *driver);
rt_size_t rt_i2c_transfer(struct rt_i2c_bus *bus,
struct rt_i2c_msg *msgs, rt_uint32_t size);
rt_size_t rt_i2c_master_send(struct rt_i2c_device *device,
const rt_uint8_t *buf, rt_uint32_t size);
rt_size_t rt_i2c_master_recv(struct rt_i2c_device *device,
rt_uint8_t *buf ,rt_uint32_t size);
rt_err_t rt_i2c_core_init();
#ifdef __cplusplus
}
#endif
#endif

318
components/drivers/i2c/i2c_core.c
View File

@ -12,362 +12,118 @@
* 2012-04-25 weety first version * 2012-04-25 weety first version
*/ */
#include <i2c.h> #include <rtdevice.h>
#include <i2c_dev.h>
static struct rt_mutex i2c_core_lock; static struct rt_mutex i2c_core_lock;
static struct rt_mutex i2c_hardware_lock;
static rt_list_t i2c_hw_info_list = RT_LIST_OBJECT_INIT(i2c_hw_info_list);
static rt_list_t i2c_bus_list = RT_LIST_OBJECT_INIT(i2c_bus_list);
static struct rt_i2c_bus *find_i2c_bus(rt_uint32_t id) rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus, const char *bus_name)
{ {
rt_list_t *list; rt_err_t res = RT_EOK;
struct rt_i2c_bus *bus = RT_NULL;
for (list = (&i2c_bus_list)->next; list != &i2c_bus_list; list = list->next) rt_mutex_init(&bus->lock, "i2c_bus_lock", RT_IPC_FLAG_FIFO);
{
bus = (struct rt_i2c_bus *)rt_list_entry(list, struct rt_i2c_bus, list);
if (bus->id == id)
{
return bus;
}
}
return RT_NULL;
}
rt_err_t rt_i2c_bus_register(struct rt_i2c_bus *bus)
{
rt_err_t ret = RT_EOK;
struct rt_i2c_bus *tbus;
rt_mutex_init (&bus->lock, "i2c_bus_lock", RT_IPC_FLAG_FIFO);
rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER); rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER);
tbus = find_i2c_bus(bus->id);
if (tbus != RT_NULL)
{
rt_kprintf("I2C bus ID [%d] already registered\n", bus->id);
ret = -RT_ERROR;
goto out;
}
if (bus->timeout == 0) if (bus->timeout == 0)
bus->timeout = RT_TICK_PER_SECOND; bus->timeout = RT_TICK_PER_SECOND;
rt_list_init(&bus->devices); res = rt_i2c_bus_device_device_init(bus, bus_name);
ret = rt_i2c_bus_device_init(bus, bus->name); i2c_dbg("I2C bus [%s] registered\n", bus_name);
if (ret != RT_EOK)
{
rt_mutex_release(&i2c_core_lock);
rt_kprintf("I2C bus [%s] register failed\n", bus->name);
goto out;
}
rt_list_insert_after(&i2c_bus_list, &bus->list);
rt_mutex_release(&i2c_core_lock); rt_mutex_release(&i2c_core_lock);
return res;
rt_kprintf("I2C bus [%s] registered\n", bus->name);
out:
return ret;
} }
rt_err_t rt_i2c_bus_unregister(struct rt_i2c_bus *bus) struct rt_i2c_bus_device* rt_i2c_bus_device_find(const char *bus_name)
{ {
rt_err_t ret = RT_EOK; struct rt_i2c_bus_device *bus;
struct rt_i2c_bus *bus_l; rt_device_t dev = rt_device_find(bus_name);
rt_list_t *list; if (dev == RT_NULL || dev->type != RT_Device_Class_I2CBUS)
struct rt_i2c_device *device;
rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER);
rt_i2c_bus_device_exit(bus);
for (list = (&bus->devices)->next; list != &bus->devices; list = list->next)
{ {
device = (struct rt_i2c_device *)rt_list_entry(list, struct rt_i2c_device, bus_list); i2c_dbg("I2C bus %s not exist\n", bus_name);
if (device)
{
ret = device->driver->remove(device);
if (ret != RT_EOK)
{
i2c_dbg("I2C driver [%s] unregister failed\n", device->driver->name);
goto out;
}
rt_list_remove(&device->drv_list);
rt_list_remove(&device->bus_list);
}
}
rt_list_init(&bus->devices);
rt_list_remove(&bus->list);
rt_mutex_detach (&bus->lock);
rt_kprintf("I2C bus [%s] unregister\n", bus->name);
out:
rt_mutex_release(&i2c_core_lock);
return ret;
}
rt_inline struct rt_i2c_hardware_info *
i2c_check_hw_info(struct rt_i2c_hardware_info *hwinfo)
{
rt_list_t *list;
struct rt_i2c_hardware_info *info;
for (list = (&i2c_hw_info_list)->next; list != &i2c_hw_info_list; list = list->next)
{
info = (struct rt_i2c_hardware_info *)rt_list_entry(list,
struct rt_i2c_hardware_info, list);
if ((info->bus_id == hwinfo->bus_id) && (info->addr == hwinfo->addr))
{
return info;
}
}
return RT_NULL; return RT_NULL;
}
void rt_i2c_hw_info_register(struct rt_i2c_hardware_info *info, rt_uint32_t size)
{
rt_mutex_take(&i2c_hardware_lock, RT_WAITING_FOREVER);
for( ; size > 0; size--, info++)
{
if (i2c_check_hw_info(info) == RT_NULL)
{
rt_list_insert_after(&i2c_hw_info_list, &info->list);
}
else
{
rt_kprintf("I2C hw info [%s:%d:%d] already registered\n",
info->name, info->bus_id, info->addr);
}
}
rt_mutex_release(&i2c_hardware_lock);
}
rt_err_t rt_i2c_check_addr(struct rt_i2c_bus *bus, rt_uint16_t addr)
{
rt_list_t *list;
struct rt_i2c_device *device;
for (list = (&bus->devices)->next; list != &bus->devices; list = list->next)
{
device = (struct rt_i2c_device *)rt_list_entry(list, struct rt_i2c_device, bus_list);
if (device->addr == addr)
{
rt_kprintf("ERR: device at addr[0x%02x] "
"already registered\n", addr);
return -RT_ERROR;
}
} }
return RT_EOK; bus = (struct rt_i2c_bus_device *)dev->user_data;
}
static rt_err_t i2c_driver_probe(struct rt_i2c_bus *bus, return bus;
struct rt_i2c_driver *driver, struct rt_i2c_hardware_info *info)
{
rt_err_t ret = RT_EOK;
struct rt_i2c_device *device;
device = rt_malloc(sizeof(struct rt_i2c_device));
if (device == RT_NULL)
{
i2c_dbg("I2C malloc memory failed\n");
return -RT_ENOMEM;
}
rt_memset(device, 0, sizeof(struct rt_i2c_device));
device->flags = info->flags;
device->addr = info->addr;
device->bus = bus;
device->driver = driver;
rt_list_insert_after(&bus->devices, &device->bus_list);
rt_list_insert_after(&driver->devices, &device->drv_list);
ret = driver->probe(device);
return ret;
}
static rt_err_t i2c_bus_match_hw(struct rt_i2c_driver *driver)
{
rt_err_t ret = RT_EOK;
rt_list_t *list;
struct rt_i2c_hardware_info *info;
struct rt_i2c_bus *bus = RT_NULL;
for (list = (&i2c_hw_info_list)->next; list != &i2c_hw_info_list; list = list->next)
{
info = (struct rt_i2c_hardware_info *)rt_list_entry(list,
struct rt_i2c_hardware_info, list);
if (rt_strncmp(info->name, driver->name, RT_I2C_NAME_SIZE) == 0)
{
bus = find_i2c_bus(info->bus_id);
if (bus)
{
if (rt_i2c_check_addr(bus, info->addr) != RT_EOK)
{
continue;
}
if (i2c_driver_probe(bus, driver, info) != RT_EOK)
{
ret = -RT_ERROR;
}
}
}
}
return ret;
}
rt_err_t rt_i2c_bus_attach_driver(struct rt_i2c_driver *driver)
{
rt_err_t ret = RT_EOK;
rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER);
ret = i2c_bus_match_hw(driver);
rt_mutex_release(&i2c_core_lock);
if (ret != RT_EOK)
{
goto out;
}
rt_kprintf("I2C driver [%s] registered\n", driver->name);
return RT_EOK;
out:
rt_kprintf("I2C driver [%s] register failed\n", driver->name);
return ret;
} }
rt_err_t rt_i2c_bus_detach_driver(struct rt_i2c_driver *driver) rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num)
{
rt_err_t ret = RT_EOK;
rt_list_t *list;
struct rt_i2c_device *device;
rt_mutex_take(&i2c_core_lock, RT_WAITING_FOREVER);
for (list = (&driver->devices)->next; list != &driver->devices; list = list->next)
{
device = (struct rt_i2c_device *)rt_list_entry(list, struct rt_i2c_device, drv_list);
if (device)
{
ret = driver->remove(device);
if (ret != RT_EOK)
{
rt_mutex_release(&i2c_core_lock);
goto out;
}
rt_list_remove(&device->drv_list);
rt_list_remove(&device->bus_list);
}
}
rt_mutex_release(&i2c_core_lock);
rt_kprintf("I2C driver [%s] unregister\n", driver->name);
out:
return ret;
}
rt_size_t rt_i2c_transfer(struct rt_i2c_bus *bus,
struct rt_i2c_msg *msgs, rt_uint32_t size)
{ {
rt_size_t ret; rt_size_t ret;
if (bus->ops->master_xfer) if (bus->ops->master_xfer)
{ {
#ifdef RT_I2C_DEBUG #ifdef RT_I2C_DEBUG
for (ret = 0; ret < size; ret++) for (ret = 0; ret < num; ret++)
{ {
i2c_dbg("msgs[%d] %c, addr=0x%02x, len=%d%s\n", ret, i2c_dbg("msgs[%d] %c, addr=0x%02x, len=%d%s\n", ret,
(msgs[ret].flags & RT_I2C_RD) ? 'R' : 'W', (msgs[ret].flags & RT_I2C_RD) ? 'R' : 'W',
msgs[ret].addr, msgs[ret].len); msgs[ret].addr, msgs[ret].len);
} }
#endif #endif
rt_mutex_take(&bus->lock, RT_WAITING_FOREVER); rt_mutex_take(&bus->lock, RT_WAITING_FOREVER);
ret = bus->ops->master_xfer(bus, msgs, num);
ret = bus->ops->master_xfer(bus, msgs, size);
rt_mutex_release(&bus->lock); rt_mutex_release(&bus->lock);
return ret; return ret;
} }
else else
{ {
rt_kprintf("I2C bus transfers not supported\n"); rt_kprintf("I2C bus operation not supported\n");
return -RT_ERROR; return -RT_ERROR;
} }
} }
rt_size_t rt_i2c_master_send(struct rt_i2c_device *device, rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus, rt_uint16_t addr,
const rt_uint8_t *buf, rt_uint32_t size) rt_uint16_t flags, const rt_uint8_t *buf,
rt_uint32_t count)
{ {
rt_size_t ret; rt_size_t ret;
struct rt_i2c_msg msg; struct rt_i2c_msg msg;
struct rt_i2c_bus *bus = device->bus;
msg.addr = device->addr; msg.addr = addr;
msg.flags = device->flags & RT_I2C_ADDR_10BIT; msg.flags = flags & RT_I2C_ADDR_10BIT;
msg.len = size; msg.len = count;
msg.buf = (rt_uint8_t *)buf; msg.buf = (rt_uint8_t *)buf;
ret = rt_i2c_transfer(bus, &msg, 1); ret = rt_i2c_transfer(bus, &msg, 1);
if (ret > 0) return (ret > 0) ? count : ret;
{
return size;
}
return ret;
} }
rt_size_t rt_i2c_master_recv(struct rt_i2c_device *device, rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus, rt_uint16_t addr,
rt_uint8_t *buf, rt_uint32_t size) rt_uint16_t flags, rt_uint8_t *buf,
rt_uint32_t count)
{ {
rt_size_t ret; rt_size_t ret;
struct rt_i2c_msg msg; struct rt_i2c_msg msg;
struct rt_i2c_bus *bus = device->bus;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
msg.addr = device->addr; msg.addr = addr;
msg.flags = device->flags & RT_I2C_ADDR_10BIT; msg.flags = flags & RT_I2C_ADDR_10BIT;
msg.flags |= RT_I2C_RD; msg.flags |= RT_I2C_RD;
msg.len = size; msg.len = count;
msg.buf = buf; msg.buf = buf;
ret = rt_i2c_transfer(bus, &msg, 1); ret = rt_i2c_transfer(bus, &msg, 1);
if (ret > 0) return (ret > 0) ? count : ret;
{
return size;
}
return ret;
} }
rt_err_t rt_i2c_core_init() rt_err_t rt_i2c_core_init(void)
{ {
rt_mutex_init (&i2c_core_lock, "i2c_core_lock", RT_IPC_FLAG_FIFO); rt_mutex_init (&i2c_core_lock, "i2c_core_lock", RT_IPC_FLAG_FIFO);
rt_mutex_init (&i2c_hardware_lock, "i2c_hw_lock", RT_IPC_FLAG_FIFO);
} }

82
components/drivers/i2c/i2c_dev.c
View File

@ -1,12 +1,8 @@
#include <i2c.h> #include <rtdevice.h>
#include <i2c_dev.h>
static rt_err_t i2c_bus_device_init(rt_device_t dev) static rt_err_t i2c_bus_device_init(rt_device_t dev)
{ {
struct rt_i2c_bus* bus; struct rt_i2c_bus_device* bus = (struct rt_i2c_bus_device *)dev->user_data;
struct rt_i2c_device *i2c_device = dev->user_data;
bus = i2c_device->bus;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
return RT_EOK; return RT_EOK;
@ -14,53 +10,54 @@ static rt_err_t i2c_bus_device_init(rt_device_t dev)
static rt_size_t i2c_bus_device_read (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t count) static rt_size_t i2c_bus_device_read (rt_device_t dev, rt_off_t pos, void *buffer, rt_size_t count)
{ {
struct rt_i2c_bus* bus; rt_uint16_t addr;
struct rt_i2c_device *i2c_device = dev->user_data; rt_uint16_t flags;
struct rt_i2c_bus_device* bus = (struct rt_i2c_bus_device *)dev->user_data;
bus = i2c_device->bus;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
RT_ASSERT(i2c_device != RT_NULL);
RT_ASSERT(buffer != RT_NULL); RT_ASSERT(buffer != RT_NULL);
i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", bus->name, count); i2c_dbg("I2C bus dev [%s] reading %u bytes.\n", dev->parent.name, count);
return rt_i2c_master_recv(i2c_device, buffer, count); addr = pos & 0xffff;
flags = (pos >> 16) & 0xffff;
return rt_i2c_master_recv(bus, addr, flags, buffer, count);
} }
static rt_size_t i2c_bus_device_write (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t size) static rt_size_t i2c_bus_device_write (rt_device_t dev, rt_off_t pos, const void *buffer, rt_size_t count)
{ {
struct rt_i2c_bus* bus; rt_uint16_t addr;
struct rt_i2c_device *i2c_device = dev->user_data; rt_uint16_t flags;
struct rt_i2c_bus_device* bus = (struct rt_i2c_bus_device *)dev->user_data;
bus = i2c_device->bus;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
RT_ASSERT(i2c_device != RT_NULL);
RT_ASSERT(buffer != RT_NULL); RT_ASSERT(buffer != RT_NULL);
i2c_dbg("I2C bus dev writing %u bytes.\n", bus->name, size); i2c_dbg("I2C bus dev writing %u bytes.\n", dev->parent.name, count);
return rt_i2c_master_send(i2c_device, buffer, size); addr = pos & 0xffff;
flags = (pos >> 16) & 0xffff;
return rt_i2c_master_send(bus, addr, flags, buffer, count);
} }
static rt_err_t i2c_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args) static rt_err_t i2c_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{ {
rt_err_t ret; rt_err_t ret;
struct rt_i2c_bus* bus;
struct rt_i2c_priv_data *priv_data; struct rt_i2c_priv_data *priv_data;
struct rt_i2c_device *i2c_device = dev->user_data; struct rt_i2c_bus_device* bus = (struct rt_i2c_bus_device *)dev->user_data;
bus = i2c_device->bus;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
RT_ASSERT(i2c_device != RT_NULL);
switch (cmd) switch (cmd)
{ {
case RT_I2C_DEV_CTRL_10BIT: /* set 10-bit addr mode */ case RT_I2C_DEV_CTRL_10BIT: /* set 10-bit addr mode */
i2c_device->flags |= RT_I2C_ADDR_10BIT; bus->flags |= RT_I2C_ADDR_10BIT;
break; break;
case RT_I2C_DEV_CTRL_ADDR: case RT_I2C_DEV_CTRL_ADDR:
i2c_device->addr = *(rt_uint16_t *)args; bus->addr = *(rt_uint16_t *)args;
break; break;
case RT_I2C_DEV_CTRL_TIMEOUT: case RT_I2C_DEV_CTRL_TIMEOUT:
bus->timeout = *(rt_uint32_t *)args; bus->timeout = *(rt_uint32_t *)args;
@ -80,27 +77,14 @@ static rt_err_t i2c_bus_device_control(rt_device_t dev, rt_uint8_t cmd, void *ar
} }
rt_err_t rt_i2c_bus_device_init(struct rt_i2c_bus* bus, const char* name) rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device* bus, const char* name)
{ {
struct rt_device *device; struct rt_device *device;
struct rt_i2c_device *i2c_device;
RT_ASSERT(bus != RT_NULL); RT_ASSERT(bus != RT_NULL);
//device = &bus->parent; device = &bus->parent;
i2c_device = rt_malloc(sizeof(struct rt_i2c_device)); device->user_data = bus;
if (i2c_device == RT_NULL)
{
return -RT_ENOMEM;
}
rt_memset(i2c_device, 0, sizeof(struct rt_i2c_device));
device = &i2c_device->dev;
i2c_device->bus = bus;
bus->parent = device;
device->user_data = i2c_device;
/* set device type */ /* set device type */
device->type = RT_Device_Class_I2CBUS; device->type = RT_Device_Class_I2CBUS;
@ -118,20 +102,4 @@ rt_err_t rt_i2c_bus_device_init(struct rt_i2c_bus* bus, const char* name)
return RT_EOK; return RT_EOK;
} }
rt_err_t rt_i2c_bus_device_exit(struct rt_i2c_bus* bus)
{
struct rt_device *device;
struct rt_i2c_device *i2c_device;
RT_ASSERT(bus != RT_NULL);
device = bus->parent;
i2c_device = device->user_data;;
/* register to device manager */
rt_device_unregister(device);
rt_free(i2c_device);
return RT_EOK;
}

2
components/drivers/i2c/i2c-bit-ops.h → components/drivers/include/drivers/i2c-bit-ops.h
View File

@ -32,7 +32,7 @@ struct rt_i2c_bit_ops {
rt_uint32_t timeout; /* in tick */ rt_uint32_t timeout; /* in tick */
}; };
rt_err_t rt_i2c_bit_add_bus(struct rt_i2c_bus *bus); rt_err_t rt_i2c_bit_add_bus(struct rt_i2c_bus_device *bus, const char *bus_name);
#ifdef __cplusplus #ifdef __cplusplus
} }

79
components/drivers/include/drivers/i2c.h Normal file
View File

@ -0,0 +1,79 @@
/*
* File : i2c.h
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2006, RT-Thread Development Team
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rt-thread.org/license/LICENSE
*
* Change Logs:
* Date Author Notes
* 2012-04-25 weety first version
*/
#ifndef __I2C_H__
#define __I2C_H__
#include <rtthread.h>
#ifdef __cplusplus
extern "C" {
#endif
#define RT_I2C_WR 0x0000
#define RT_I2C_RD (1u << 0)
#define RT_I2C_ADDR_10BIT (1u << 2) /* this is a ten bit chip address */
#define RT_I2C_NO_START (1u << 4)
#define RT_I2C_IGNORE_NACK (1u << 5)
#define RT_I2C_NO_READ_ACK (1u << 6) /* when I2C reading, we do not ACK */
struct rt_i2c_msg {
rt_uint16_t addr;
rt_uint16_t flags;
rt_uint16_t len;
rt_uint8_t *buf;
};
struct rt_i2c_bus_device;
struct rt_i2c_bus_device_ops {
rt_size_t (*master_xfer) (struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num);
rt_size_t (*slave_xfer) (struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num);
rt_err_t (*i2c_bus_control) (struct rt_i2c_bus_device *bus, rt_uint32_t, rt_uint32_t);
};
/*for i2c bus driver*/
struct rt_i2c_bus_device {
struct rt_device parent;
const struct rt_i2c_bus_device_ops *ops;
rt_uint16_t flags;
rt_uint16_t addr;
struct rt_mutex lock;
rt_uint32_t timeout;
rt_uint32_t retries;
void *priv;
};
#ifdef RT_I2C_DEBUG
#define i2c_dbg(fmt, ...) rt_kprintf(fmt, ##__VA_ARGS__)
#else
#define i2c_dbg(fmt, ...)
#endif
rt_err_t rt_i2c_bus_device_register(struct rt_i2c_bus_device *bus, const char *bus_name);
struct rt_i2c_bus_device* rt_i2c_bus_device_find(const char *bus_name);
rt_size_t rt_i2c_transfer(struct rt_i2c_bus_device *bus, struct rt_i2c_msg msgs[], rt_uint32_t num);
rt_size_t rt_i2c_master_send(struct rt_i2c_bus_device *bus, rt_uint16_t addr,
rt_uint16_t flags, const rt_uint8_t *buf,
rt_uint32_t count);
rt_size_t rt_i2c_master_recv(struct rt_i2c_bus_device *bus, rt_uint16_t addr,
rt_uint16_t flags, rt_uint8_t *buf,
rt_uint32_t count);
rt_err_t rt_i2c_core_init(void);
#ifdef __cplusplus
}
#endif
#endif

3
components/drivers/i2c/i2c_dev.h → components/drivers/include/drivers/i2c_dev.h
View File

@ -17,8 +17,7 @@ struct rt_i2c_priv_data {
rt_size_t number; rt_size_t number;
}; };
rt_err_t rt_i2c_bus_device_init(struct rt_i2c_bus* bus, const char* name); rt_err_t rt_i2c_bus_device_device_init(struct rt_i2c_bus_device* bus, const char* name);
rt_err_t rt_i2c_bus_device_exit(struct rt_i2c_bus* bus);
#ifdef __cplusplus #ifdef __cplusplus

9
components/drivers/include/rtdevice.h
View File

@ -67,4 +67,13 @@ rt_size_t rt_ringbuffer_emptry_size(struct rt_ringbuffer* rb);
#include "drivers/serial.h" #include "drivers/serial.h"
#endif #endif
#ifdef RT_USING_I2C
#include "drivers/i2c.h"
#include "drivers/i2c_dev.h"
#endif
#ifdef RT_USING_I2C_BITOPS
#include "drivers/i2c-bit-ops.h"
#endif
#endif #endif