NXP Cortex-M4 LPC43xx用户手册详解
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NXP的M4用户手册是一份针对LPC4300系列处理器的详细介绍文档，主要针对的是Cortex-M4架构。Cortex-M4是ARM公司设计的一款高性能、低功耗的嵌入式微控制器内核，以其优秀的处理性能和丰富的特性在众多微控制器中脱颖而出。这份手册涵盖了LPC43xx平台，提供了初步用户指南，帮助开发人员理解和利用这款处理器。
文档的核心内容包括但不限于：
1. **产品概述**：LPC4000预览用户手册概述了LPC4300系列的特点，强调了其使用ARMCortex-M4内核的优势，适合那些希望深入学习这一技术的开发者。
2. **文档信息**：手册版本为00.05，发布日期为2011年5月18日，包含了法律免责声明，表明所有提供的信息都是当时的最新版本。
3. **修订历史**：手册的早期版本更新了部分功能描述，如MSGVAL位的描述、MAC_RWAKE_FRFLT寄存器的使用限制（与bit-banding不兼容）、RMII和MII引脚的修正以及以太网功能的详细说明。
4. **关键特性**：文档涉及到了MSGVAL位的具体更新，这可能是关于中断管理或异常处理的重要部分。MAC_RWAKE_FRFLT寄存器的注意事项说明了可能存在的潜在设计陷阱，提示开发者在实际应用中要避免误用。RMII和MII引脚的正确描述确保了网络通信功能的正确配置。
5. **联系信息**：手册提供了NXP公司的官方网站和销售办公室联系方式，以便用户获取更多支持和服务。
6. **版权声明**：所有内容受NXP公司的版权保护，未经许可不得复制或用于商业用途。
通过阅读这份NXP的M4用户手册，开发者可以深入了解LPC4300处理器的工作原理、特性以及如何有效地集成到自己的项目中，实现高效能和低功耗的嵌入式系统设计。对于任何从事嵌入式开发，尤其是使用Cortex-M4的工程师来说，这是一份非常实用且宝贵的参考资料。
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<Document ID> All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 00.05 — 18 May 2011 16 of 825
NXP Semiconductors
LPC4000
Chapter 2: LPC4000 Internal Process Communication (IPC)
2.3.3 Example
Assume a certain task with ID 0x1234 should be executed by the M0. For example, read
data from a register level interface controlled by the M0. Text in bold indicates a register.
The registers can either be located in the M0 SRAM, for more deterministic access times,
or in shared SRAM. If the M0 SRAM is used, then the register data needs to be copied at
initialization time. This copying takes time. The M4 can poll a status register to determine
when the transfer has finished.
The M4 initializes the command and message queues by loading the start- and end
addresses and write and read pointers.
Then the M4 loads the register values in a reserved area in common SRAM memory. (An
alternative approach is that the M4 writes register per register, however this requires more
communication overhead than loading all data in one go.)
Once all data has been set up, the M0 task can be started.
Table 5. Message list
Message Bit mask Description
MSG_SRV_ID 0xTTTT.SS00 M0 request servicing for the task with ID =
0xTTTT. The service type is coded in bytes SS.
The meaning of SS is proprietary per task.
SS=0x00 means the task has finished.
MSG_RD_ID 0xTTTT.PPP1, VALUE M0 responds with VALUE to a read of WORD
with argument ID=0xPPP* from the task with ID
= 0xTTTT.
MSG_RD_STS_ID 0xTTTT.PPPR M0 response to a read of WORD with argument
ID=0xPPP* from the task with ID = 0xTTTT fails.
Cause of the failure is coded in R; R = 2...4
2 = invalid argument
3 = reserved
4 = reserved
MSG_WR_STS_ID 0xTTTT.PPPW M0 response to a write with argument
ID=0xPPP* from the task with ID = 0xTTTT.
Response is coded in W; W = 5...7
5 = write was successful
6 = write failed
7 = reserved
Table 6. Command responses
Command Possible responses Description
CMD_RD_ID MSG_RD_ID, VALUE read acknowledged
MSG_RD_STS_ID read failed
CMD_WR, WORD MSG_WR_STS_ID write is acknowledged as a success or failure
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