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Tower I3C Host Adapter 使用范例 (19)

news 2026/3/27 5:40:57

Easyi3C是一家领先的嵌入式系统工具供应商，可简化各种通信协议的开发和调试。公司提供一系列产品，旨在帮助工程师和开发人员更高效地使用I3C、I2C等协议。

基于Tower I3C Host Adapter 测试DDR5 RCD (3)

二基于Tower I3C Host Adapter 测试 DDR5 RCD I2C

依据上面一节节选的JEDEC Spec I2C写入和读取格式，我们专门为DDR5 RCD I2C归纳了下面的API：

通过我们支持的API，可以很方便的测试DDR5 RCD I2C。

三测试环境搭建

利用Tower I3C Host Adapter如下图搭建测试环境：

首先将Easyi3C Host I3C/I2C adapter 通过USB Type-C 数据线连上电脑，安装好所需要的USB驱动程序，然后通过官方配送的Cable线连上target。

四 API安装

从官方网站下载对应的软件包，Easyi3C Tower I3C Host Adapter DDR5 Device API。

Easyi3C 为 DDR5 设备提供了一套 Python API。使用 API 时，用户必须先安装 Python。Easyi3C 支持从 Python3.8 到 Python3.13。

Notes：Easyi3C DDR5 设备 API 基于 Easyi3C 标准 API。安装前，您必须确保已安装标准的 Easyi3C API 包。

Easyi3C DDR5 设备 API 以 Python wheel包的形式提供。名称是：

在用户电脑安装 Python 后，执行以下命令安装 Easyi3C 的 DDR5 设备包 API：

Notes：红色框代表对应的Python版本。比如你的 Python 版本是 3.8，你必须安装 ddr5-x.x.x-cp38-cp38-win-amd64.whl。

上述命令也用于升级新版本的API包。

要卸载该包，请运行：

五 I2C测试参考代码：

利用上面安装的wheel包，通过支持的API进行I2C协议测试。

# ========================================================================== # Easyi3C Tower USB to I3C Host Adapter Interface Library # -------------------------------------------------------------------------- # Copyright © 2026 by Easyi3C, Inc. # All rights reserved. # -------------------------------------------------------------------------- # ========================================================================== import sys from ezi3c.api import * from ddr5 import Rcd from ddr5 import Pmic0 import time from ezi3c import crc ez = ez_open() if not ez: print("Cannot open Adapter") sys.exit(-1) clk = ez_set_bus_clk_freq(ez, 1000, 4000) print("Cur Clk Freq: {}".format(clk)) ret = ez_set_io_voltage(ez, 1.0) assert ret == 0, "Faield to set IO voltage" hid = 7 pmic0 = Pmic0(ez, hid=hid) rcd = Rcd(ez, hid=hid) try: print("switch to i2c") rcd.switch_to_i2c(send_ccc=True) assert ret == 0, "Failed to reset DAA: addr:{:02X}".format(rcd.addr) # VR Enable pmic0.i2c_write_reg(0x32, 0xa0) time.sleep(1) # make sure power is ready print("I2C Read Test") channel = 0 page = 3 device_id_reg = 0x6c DEVICE_ID = (0x00, 0x51) print("I2C Block Mode Read Test") ret, data = rcd.i2c_block_read(channel, page, device_id_reg) assert data[2:] == DEVICE_ID print("I2C Block Mode Read Test with PEC") rcd.enable_pec(send_ccc=False) # I2C enable pec no need send ccc ret, data = rcd.i2c_block_read(channel, page, device_id_reg) assert data[2:] == DEVICE_ID rcd.disable_pec(send_ccc=False) # I2C disable pec no need send ccc print("I2C Block Mode Read optimized Test") ret, data = rcd.i2c_block_read_optimized(channel, page, device_id_reg) assert data[2:] == DEVICE_ID print("I2C Byte Mode Read Test") ret, data = rcd.i2c_byte_read(channel, page, device_id_reg) assert data[2:] == DEVICE_ID print("I2C Byte Mode Read Test with PEC") rcd.enable_pec(send_ccc=False) # I2C enable pec no need send ccc ret, data = rcd.i2c_byte_read(channel, page, device_id_reg) assert data[2:] == DEVICE_ID rcd.disable_pec(send_ccc=False) # I2C disable pec no need send ccc print("I2C Block Mode Write Byte Test") channel = 0 page = 0 reg = 0x40 value = 0x50 ret = rcd.i2c_block_write_byte(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[3] print("I2C Block Mode Write Byte Test with PEC") rcd.enable_pec(send_ccc=False) # I2C enable pec no need send ccc value = 0x51 ret = rcd.i2c_block_write_byte(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[3] rcd.disable_pec(send_ccc=False) # I2C disable pec no need send ccc print("I2C Block Mode Write Word Test") value = 0x5152 ret = rcd.i2c_block_write_word(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[2] << 8 | data[3] print("I2C Block Mode Write Word Test with PEC") rcd.enable_pec(send_ccc=False) # I2C enable pec no need send ccc value = 0x5354 ret = rcd.i2c_block_write_word(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[2] << 8 | data[3] rcd.disable_pec(send_ccc=False) # I2C disable pec no need send ccc print("I2C Block Mode Write DWord Test") value = 0x55565758 ret = rcd.i2c_block_write_dword(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3] print("I2C Block Mode Write DWord Test with PEC") rcd.enable_pec(send_ccc=False) # I2C enable pec no need send ccc value = 0x50515253 ret = rcd.i2c_block_write_dword(channel, page, reg, value) ret, data = rcd.i2c_block_read(channel, page, reg) assert value == data[0] << 24 | data[1] << 16 | data[2] << 8 | data[3] rcd.disable_pec(send_ccc=False) # I2C disable pec no need send ccc finally: rcd.ccc_rstdaa() ez_close(ez) print("Adapter closed.")