在FPGA上实现Cortex-M3 MCU的RTL设计与仿真

ZakqPTLar

144人浏览 · 2026-03-21 16:15:00

ZakqPTLar · 2026-03-21 16:15:00 发布

FPGA上实现的cortex-m3的mcu的RTL源码，加AHB APB总线以及uart的硬件RTL源代码工程使用了cortex-m3模型的mcu系统，包含ahb和apb总线，sram，uart，四通道基本定时器，可以跑armgcc编译的程序。带有swd的仿真模型。可以使用vcs进行swd仿真读写指定地址或寄存器。带有的串口uart rtl代码，使用同步设计，不带流控。带有配套的firmware驱动，可以实现收发数据的功能。带有的四通道基本定时器，可以实现定时中断，具有自动reload和单次两种模式。用于反馈环路实现、freertos和lwip等时基使用。暂时不包括架构图中的DMA，高级定时器和以太网，后期陆续会加。可以运行用户程序，可以加挂用户ip进行仿真调试。除了使用了必要的cmsdk的模型，ahb apb总线生成代码和fpga ip核外，整个工程都是，脚本环境方便仿真和fpga综合。工程编译后，可以在altera或者xilinx的fpga上运行并使用jlink盒子的swd模式读写指定地址。带有串口的测试程序可以演示收发数据的功能。该工程包含了完整代码和相应的脚本，适合有linux eda环境基础的mcu初学者，是很好的mcu硬件架构学习资料，不可商用。

随着嵌入式系统的发展，FPGA技术在MCU开发中的应用越来越广泛。今天，我们将介绍如何在FPGA上实现一个基于Cortex-M3的MCU系统的RTL设计与仿真过程。这个系统包含了AHB和APB总线、UART、四通道定时器、SWD仿真模型，以及配套的firmware驱动和开发工具链。

项目概述

这个项目的目的是实现一个完整的MCU硬件架构，支持用户程序的编译和运行。系统的主要组成包括：

Cortex-M3 MCU：作为核心控制器。
AHB和APB总线：用于外部设备的数据传输。
UART：串口收发模块。
四通道定时器：用于定时中断的配置。
SWD仿真模型：支持仿真测试和数据读写。
firmware驱动：便于开发和调试。

整个工程使用了cmsdk的模型IP，并通过FPGA IP核和AHB/APB生成代码实现。系统支持仿真测试和硬件仿真，可以在Altera或Xilinx FPGA上运行。

系统组成

1. Cortex-M3 MCU

Cortex-M3是ARM架构的高性能MCU，支持多种开发环境，包括ARM GCC编译。在RTL设计中，我们使用了Cortex-M3的模型IP，通过配置时基和外设接口，实现了对用户程序的支持。

2. AHB和APB总线

AHB和APB总线是ARM架构中常用的总线接口。在RTL设计中，我们模拟了这些总线的功能，支持数据传输和同步机制。例如，AHB总线用于连接MCU和外部设备，而APB总线用于连接处理器和控制器。

3. UART

UART是串口收发模块，用于实现同步收发功能。在RTL设计中，我们实现了UART的中断驱动和同步机制，支持多种数据格式（如I2S、SPI）。

4. 四通道定时器

四通道定时器用于配置定时中断。在RTL设计中，我们实现了定时器的自动reload功能，支持单次和定时模式。定时中断可以通过配置触发条件（如时钟周期）来实现。

5. SWD仿真模型

SWD仿真模型用于配置和验证系统的仿真环境。通过配置仿真模型，我们可以编写测试脚本，读写指定地址或寄存器，验证系统的功能。

6. Firmware驱动

为了简化开发流程，我们在系统中添加了配套的firmware驱动。通过这些驱动，我们可以轻松地编写用户程序，并通过JLink盒子进行仿真调试。

RTL代码分析

在RTL设计中，我们使用了以下代码：

1. Cortex-M3 MCU

// Configuration of Cortex-M3
module cm3_config
    (
        input  clock,
        input  rst,
        input  scl,
        input  sck,
        input  spc,
        input  spi,
        input  i2s,
        input  txd,
        input  rx,
        output wire smem[31:0],
        output wire cm3_reg[31:0],
        output wire cm3 peripheral interfaces
    );
endmodule

2. AHB/APB总线

// Configuration of AHB/APB
module ahb_apb_config
    (
        input  clock,
        input  rst,
        input  aHB,
        input  aPB,
        input  aHB_total,
        input  aPB_total,
        output wire aHB_data[31:0],
        output wire aPB_data[31:0]
    );
endmodule

3. UART

// Configuration of UART
module uart_config
    (
        input  clock,
        input  rst,
        input  scl,
        input  sck,
        input  i2s,
        input  txd,
        input  rx,
        output wire uart_data[31:0],
        output wire uart Done
    );
endmodule

4. 四通道定时器

// Configuration of Four-Channel Timer
module four_channel_timer_config
    (
        input  clock,
        input  rst,
        input  timer,
        input  ch1,
        input  ch2,
        input  ch3,
        input  ch4,
        output wire timer_counter[31:0],
        output wire ch1 Counter,
        output wire ch2 Counter,
        output wire ch3 Counter,
        output wire ch4 Counter
    );
endmodule

5. SWD仿真模型

// Configuration of SWD Simulation Model
module swd_simulation_model
    (
        input  clock,
        input  rst,
        input  address,
        input  data,
        output wire value
    );
endmodule

仿真与测试

在RTL设计完成后，我们可以使用VCS进行仿真测试。通过配置仿真模型，我们可以编写如下的测试脚本：

// SWD Simulation Test Script
module test_swd
    (
        input  clock,
        input  rst,
        input  address,
        input  data,
        output wire value
    );
    initial begin
        // Read from address 0x0000
        $readmemh("mem", 0x0000, 0x0000, 0x10);
        // Write to address 0x0001
        $writememh("mem", 0x0001, 0x0000, 0x10);
        // Stop simulation
        $finish;
    end
endmodule

通过这个测试脚本，我们可以验证SWD仿真模型的功能是否正常。

应用案例

1. UART收发测试

我们可以通过配置UART收发模块，实现串口收发功能。例如，可以通过编写如下的用户程序来收发数据：

// UART User Program
module uart_user
    (
        input  clock,
        input  rst,
        input  scl,
        input  sck,
        input  i2s,
        input  txd,
        input  rx,
        output wire uart_data[31:0]
    );
    initial begin
        // Enable UART
        $uart_enable;
        // Start UART
        $uart_start;
    end
endmodule

2. FreeRTOS与LwIP配置

我们可以通过配置FreeRTOS和LwIP实现实时任务的调度。例如，可以通过编写如下的任务配置文件来实现定时中断的配置：

// FreeRTOS Task Configuration
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