1 /*
2 * Copyright (c) 2006-2023, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Email Notes
8 * 2022-04-16 Kevin.Liu kevin.liu.mchp@gmail.com First Release
9 */
10
11 #include <rtthread.h>
12
13 #include <atmel_start.h>
14
15 #include "i2c_demo.h"
16
17 #ifdef SAM_I2C_EXAMPLE
18
19 #define I2C_AT24MAC_PGMAXSZ (16+1)
20 #define CONF_AT24MAC_ADDRESS 0x57
21
22 /**
23 * @brief Call this function will run I2C test code.
24 *
25 * @note Test code will try to read/write external EEPROM.
26 *
27 * @param None.
28 *
29 * @return RT_OK or -RT_ERROR.
30 */
31
i2c_demo_run(void)32 rt_err_t i2c_demo_run(void)
33 {
34 rt_uint8_t addr = 0x20;
35 rt_int32_t len;
36 rt_uint8_t i2ctx[I2C_AT24MAC_PGMAXSZ];
37 rt_uint8_t i2crx[I2C_AT24MAC_PGMAXSZ];
38
39 for (len = 1; len < I2C_AT24MAC_PGMAXSZ; len++)
40 {
41 i2ctx[len] = (rt_uint8_t)(len + 0x20);
42 }
43
44 /* enable I2C master and set slave address before use I2C driver module */
45 i2c_m_sync_enable(&I2C_0);
46 i2c_m_sync_set_slaveaddr(&I2C_0, CONF_AT24MAC_ADDRESS, I2C_M_SEVEN);
47
48 /* write 16bytes data to address 0x20 - I2C slave address + random address + write data[0]...[n] */
49 i2ctx[0] = addr; /* Refer to AT24MAC data sheet, first byte is page address. */
50 io_write(&(I2C_0.io), i2ctx, I2C_AT24MAC_PGMAXSZ);
51
52 /* Refer to data sheet, for random read, should send read address first. */
53 io_write(&(I2C_0.io), &addr, 1);
54
55 /* Then start I2C read after send I2C slave address first */
56 io_read(&(I2C_0.io), &i2crx[1], 16);
57 #ifndef RT_USING_FINSH
58 rt_kprintf("i2crx[0]=0x%02X i2crx[15]=0x%02X\r\n", i2crx[0], i2crx[15]);
59 #endif
60
61 return RT_EOK;
62 }
63 #endif
64
65 /*@}*/
66