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【FRDM-MCXA156测评】- 硬件SPI模块

发布于 2025-03-01 18:12:42 浏览：110 订阅该版

[tocm]

# 引言

本文介绍如何在NXP FRDM-MCXA156 开发板上配置和使用 RTT系统,通过硬件SPI进行OLED 驱动，引用u8g2 三方库进行界面显示及控制
# NXP FRDM-MCXA156 开发板
## 功能框图如下
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/ba44a31f2ee4ccbe860cbfa5846d0ed6.png.webp)
## 按键原理图

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/52b7c5ca5bb0e4c9db86f87274a981ab.png.webp)
## LED

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/45cc72ee495f681f994f20ec52d0d841.png)

## I3C

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/4809d554ba9d98db4461c9455cb3b9ac.png.webp)

## 扩展口

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/a5ad624946459d7bdf615eed72f4e0d3.png.webp)

## CAN USB

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/4b82d2cd107aa2af332fc2944907f076.png)

# 准备环境
[RTT 提供的指南](https://www.rt-thread.org/document/site/#/rt-thread-version/rt-thread-standard/tutorial/quick-start/frdm_mcxa156/quick-start "指南")
[官网指南](https://www.nxp.com/document/guide/getting-started-with-frdm-mcxa156:GS-FRDM-MCXA156?section=get-software)
[keil 支持包](https://download.csdn.net/download/xinshuwei/90442576)
[rtt 代码仓库](https://gitee.com/rtthread/rt-thread)
[env 工具](https://download-redirect.rt-thread.org/download/env_release/env-windows-v2.0.0.7z)
keil 编译器6.10试了下不支持，下载6.18版本可以正常使用

## 上电点灯

```c
#define LED_PIN        ((3*32)+0)
```
使用三色灯的蓝色，编译使用板载的DAPlink 下载，按rst 按键重启即可

# ENV SPI 配置

此芯片支持2个spi，默认加载了SPI1 驱动，后续添加下SPI0 pinmux 设置，SPI0后续也可以使用起来，这里使用SPI1 进行测试验证
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/184d3f90710794cf04a8969ef29ab912.png.webp)

1. 在rt-thread\bsp\nxp\mcx\mcxa\frdm-mcxa156 路径下打开env
输入
```c
menuconfig
```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/40c7b0b064f7b6de4d236e9edeb1e5ba.png)
选择最后一个Hardware Driver Config

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/1c0d1dbec0c7c561057969222d7f0db3.png)
选择on-chip Peripheral  Drivers

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/d0d561e940f4f3207c7e2b9ef9a9da1b.png)
使能spi 及spi1

在最开始的菜单中选择
online packages->multimedia packages->u8g2->legacy 
如下图进行配置
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/c006d53e65e13f48a6ab8101c76e3ace.png)
版本使用c
例子使用 ssd1306 SPI HW

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/790a9058f839fc86f3f6706c66d64988.png)
点击 S Q（保存 退出）

输入
```c
pkgs --update
```
下载u8g2代码

最后通过
```c
scons --target=mdk5
```
重新生成keil 工程即可

# 硬件连接
按图进行连接及调整，默认Arduino 接口没有spi ，默认是PWM
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/a76accf7c5803cffe00d78ecd8d86f2d.png.webp)
如原理图所示，需要进行调整

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20250301/dccfee0ad077a69864a10821231a1f9d.png.webp)

# 代码修改

```c
#include <rthw.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <u8g2_port.h>

// You may reference Drivers/drv_gpio.c for pinout
// In u8x8.h #define U8X8_USE_PINS

#define OLED_SPI_PIN_RES                    ((3*32) +17)
#define OLED_SPI_PIN_DC                     ((1*32) +15)
#define OLED_SPI_PIN_CS                     ((2*32) +6)

static void u8g2_ssd1306_12864_4wire_hw_spi_example(int argc,char *argv[])
{
    u8g2_t u8g2;
    // Initialization
    u8g2_Setup_ssd1306_128x64_noname_f( &u8g2, U8G2_R0, u8x8_byte_rtthread_4wire_hw_spi, u8x8_gpio_and_delay_rtthread);
    u8x8_SetPin(u8g2_GetU8x8(&u8g2), U8X8_PIN_CS, OLED_SPI_PIN_CS);
    u8x8_SetPin(u8g2_GetU8x8(&u8g2), U8X8_PIN_DC, OLED_SPI_PIN_DC);
    u8x8_SetPin(u8g2_GetU8x8(&u8g2), U8X8_PIN_RESET, OLED_SPI_PIN_RES);
    
		u8g2_InitDisplay(&u8g2);
    u8g2_SetPowerSave(&u8g2, 0);

// Draw Graphics
    /* full buffer example, setup procedure ends in _f */
    u8g2_ClearBuffer(&u8g2);
    u8g2_SetFont(&u8g2, u8g2_font_ncenB08_tr);
    u8g2_DrawStr(&u8g2, 1, 18, "U8g2 on RT-Thread");
    u8g2_SendBuffer(&u8g2);
	
	  u8g2_SetFont(&u8g2, u8g2_font_wqy12_t_gb2312);
	  u8g2_DrawUTF8(&u8g2, 1, 40, "NXP MCXA156");
	  u8g2_DrawUTF8(&u8g2, 1, 60, "硬件SPI测试");
	  u8g2_SendBuffer(&u8g2);

/*
    u8g2_SetFont(&u8g2, u8g2_font_unifont_t_symbols);
    u8g2_DrawGlyph(&u8g2, 112, 56, 0x2603 );
    u8g2_SendBuffer(&u8g2);*/
}
MSH_CMD_EXPORT(u8g2_ssd1306_12864_4wire_hw_spi_example, hardware 4 wire spi ssd1306 sample);
```
指定 RES DC CS 管脚
进行OLED 初始化 使能及显示
这里注意要显示中文的话，此c 文件需要保存成utf8 编码格式，否则会显示乱码
# 实际效果

![screenshot_6e2f506b28a3bafd5454e4241421188.jpg](https://oss-club.rt-thread.org/uploads/20250301/2a3754a7c009f5b8ef9af83f91ec08f4.jpg.webp)