1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
|
/*
* Copyright (c) 2006-2023, RT-Thread Development Team
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Email Notes
* 2022-04-16 Kevin.Liu [email protected] First Release
*/
#include <rtthread.h>
#include <atmel_start.h>
#include "i2c_demo.h"
#ifdef SAM_I2C_EXAMPLE
#define I2C_AT24MAC_PGMAXSZ (16+1)
#define CONF_AT24MAC_ADDRESS 0x57
/**
* @brief Call this function will run I2C test code.
*
* @note Test code will try to read/write external EEPROM.
*
* @param None.
*
* @return RT_OK or -RT_ERROR.
*/
rt_err_t i2c_demo_run(void)
{
rt_uint8_t addr = 0x20;
rt_int32_t len;
rt_uint8_t i2ctx[I2C_AT24MAC_PGMAXSZ];
rt_uint8_t i2crx[I2C_AT24MAC_PGMAXSZ];
for (len = 1; len < I2C_AT24MAC_PGMAXSZ; len++)
{
i2ctx[len] = (rt_uint8_t)(len + 0x20);
}
/* enable I2C master and set slave address before use I2C driver module */
i2c_m_sync_enable(&I2C_0);
i2c_m_sync_set_slaveaddr(&I2C_0, CONF_AT24MAC_ADDRESS, I2C_M_SEVEN);
/* write 16bytes data to address 0x20 - I2C slave address + random address + write data[0]...[n] */
i2ctx[0] = addr; /* Refer to AT24MAC data sheet, first byte is page address. */
io_write(&(I2C_0.io), i2ctx, I2C_AT24MAC_PGMAXSZ);
/* Refer to data sheet, for random read, should send read address first. */
io_write(&(I2C_0.io), &addr, 1);
/* Then start I2C read after send I2C slave address first */
io_read(&(I2C_0.io), &i2crx[1], 16);
#ifndef RT_USING_FINSH
rt_kprintf("i2crx[0]=0x%02X i2crx[15]=0x%02X\r\n", i2crx[0], i2crx[15]);
#endif
return RT_EOK;
}
#endif
/*@}*/
|
