66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
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/*
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* Copyright (c) 2006-2021, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Email Notes
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* 2022-04-16 Kevin.Liu kevin.liu.mchp@gmail.com First Release
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*/
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#include <rtthread.h>
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#include <atmel_start.h>
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#include "i2c_demo.h"
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#ifdef SAM_I2C_EXAMPLE
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#define I2C_AT24MAC_PGMAXSZ (16+1)
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#define CONF_AT24MAC_ADDRESS 0x57
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/**
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* @brief Call this function will run I2C test code.
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*
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* @note Test code will try to read/write external EEPROM.
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*
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* @param None.
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*
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* @return RT_OK or -RT_ERROR.
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*/
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rt_err_t i2c_demo_run(void)
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{
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rt_uint8_t addr = 0x20;
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rt_int32_t len;
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rt_uint8_t i2ctx[I2C_AT24MAC_PGMAXSZ];
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rt_uint8_t i2crx[I2C_AT24MAC_PGMAXSZ];
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for (len = 1; len < I2C_AT24MAC_PGMAXSZ; len++)
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{
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i2ctx[len] = (rt_uint8_t)(len + 0x20);
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}
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/* enable I2C master and set slave address before use I2C driver module */
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i2c_m_sync_enable(&I2C_0);
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i2c_m_sync_set_slaveaddr(&I2C_0, CONF_AT24MAC_ADDRESS, I2C_M_SEVEN);
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/* write 16bytes data to address 0x20 - I2C slave address + random address + write data[0]...[n] */
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i2ctx[0] = addr; /* Refer to AT24MAC data sheet, first byte is page address. */
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io_write(&(I2C_0.io), i2ctx, I2C_AT24MAC_PGMAXSZ);
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/* Refer to data sheet, for random read, should send read address first. */
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io_write(&(I2C_0.io), &addr, 1);
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/* Then start I2C read after send I2C slave address first */
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io_read(&(I2C_0.io), &i2crx[1], 16);
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#ifndef RT_USING_FINSH
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rt_kprintf("i2crx[0]=0x%02X i2crx[15]=0x%02X\r\n", i2crx[0], i2crx[15]);
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#endif
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return RT_EOK;
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}
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#endif
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/*@}*/
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