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ADD AT91SAM9260 I2C driver

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According to the Atmel official recommended, use GPIO instead of TWI for I2C communication

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@2129 bbd45198-f89e-11dd-88c7-29a3b14d5316
This commit is contained in:
luohui2320@gmail.com 2012-05-22 17:42:34 +00:00
parent 55460652d3
commit 6e8a644db6
2 changed files with 141 additions and 0 deletions
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16
bsp/at91sam9260/application.c
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@ -57,6 +57,14 @@
#include <dfs_romfs.h>
#endif
#ifdef RT_USING_I2C
#include <i2c.h>
static struct rt_i2c_hardware_info hw_info[] = {
{ RT_I2C_HARDWARE_INFO("pcf8563", 0, 0xA2 >> 1, 0), },
};
#endif
void rt_init_thread_entry(void* parameter)
{
/* Filesystem Initialization */
@ -134,6 +142,14 @@ void rt_init_thread_entry(void* parameter)
}
#endif
#ifdef RT_USING_I2C
{
rt_i2c_core_init();
rt_i2c_hw_info_register(hw_info, 1);
at91_i2c_init();
}
#endif
}
#ifdef RT_USING_LED

125
bsp/at91sam9260/at91_i2c_gpio.c Normal file
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@ -0,0 +1,125 @@
/*
* File : at91_i2c_gpio.c
* 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
*/
#include <rtthread.h>
#include <rthw.h>
#include <i2c.h>
#include <i2c-bit-ops.h>
#include <at91sam926x.h>
static void at91_i2c_gpio_init()
{
at91_sys_write(AT91_PMC_PCER, 1 << AT91SAM9260_ID_PIOA); //enable PIOA clock
at91_sys_write(AT91_PIOA + PIO_PUER, (1 << 23));
at91_sys_write(AT91_PIOA + PIO_PER, (1 << 23));
at91_sys_write(AT91_PIOA + PIO_MDER, (1 << 23));
at91_sys_write(AT91_PIOA + PIO_PUER, (1 << 24));
at91_sys_write(AT91_PIOA + PIO_PER, (1 << 24));
at91_sys_write(AT91_PIOA + PIO_MDER, (1 << 24));
at91_sys_write(AT91_PIOA + PIO_OER, (1 << 23));
at91_sys_write(AT91_PIOA + PIO_OER, (1 << 24));
at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 23));
at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 24));
}
static void at91_set_sda(void *data, rt_int32_t state)
{
if (state)
{
at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 23));
}
else
{
at91_sys_write(AT91_PIOA + PIO_CODR, (1 << 23));
}
}
static void at91_set_scl(void *data, rt_int32_t state)
{
if (state)
{
at91_sys_write(AT91_PIOA + PIO_SODR, (1 << 24));
}
else
{
at91_sys_write(AT91_PIOA + PIO_CODR, (1 << 24));
}
}
static rt_int32_t at91_get_sda(void *data)
{
return at91_sys_read(AT91_PIOA + PIO_PDSR) & (1 << 23);
}
static rt_int32_t at91_get_scl(void *data)
{
return at91_sys_read(AT91_PIOA + PIO_PDSR) & (1 << 24);
}
static void at91_udelay (rt_uint32_t us)
{
rt_int32_t i;
for (; us > 0; us--)
{
i = 50000;
while(i > 0)
{
i--;
}
}
}
static const struct rt_i2c_bit_ops bit_ops = {
RT_NULL,
at91_set_sda,
at91_set_scl,
at91_get_sda,
at91_get_scl,
at91_udelay,
5,
100
};
rt_err_t at91_i2c_init(void)
{
struct rt_i2c_bus *bus;
bus = rt_malloc(sizeof(struct rt_i2c_bus));
if (bus == RT_NULL)
{
rt_kprintf("rt_malloc failed\n");
return -RT_ENOMEM;
}
rt_memset((void *)bus, 0, sizeof(struct rt_i2c_bus));
bus->id = 0;
rt_snprintf(bus->name, sizeof(bus->name), "i2c-gpio%d", bus->id);
bus->priv = (void *)&bit_ops;
at91_i2c_gpio_init();
rt_i2c_bit_add_bus(bus);
return RT_EOK;
}