RT-Thread-英飞凌开发板模块评测任务大挑战-SPI驱动测试RT-Thread问答社区

英飞凌开发板模块评测任务大挑战-SPI驱动测试

发布于 2023-05-06 23:12:17 浏览：674 订阅该版

[tocm]

# 测评目的
使用PSoC™ 62 with CAPSENSE™ evaluation kit开发板适配的RTT SPI驱动，做显示测试。
#硬件分析
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/eb8fd19663c9bdb33207d7e93f23eadb.png.webp)
图1 芯片内部系统框图

如图1所示，这个芯片内部的SPI是通过SCB（Serial Communications Block）实现的。并且，所有的外设都是挂在同一总线上。
![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/349a33fb82261e6316b22310b9bec379.png.webp)
图2 系统时钟连接框图
如图2所示，SPI（SCB）这些常用外设与内核时钟同一来源。

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/9f9b9be15f7e0a87e52606ef46a3c630.png.webp)
图3 摘自数据手册中对SPI的描述
可见常见的Motorola和TI标准都是支持的，鉴于本人之前只用过Motorolab标准的SPI，后面的测试也是使用的这种。
#SPI的使用
RTT官方已经对这块板子进行了系统与驱动的适配，所以我们可以直接使用RTT的SPI驱动设备框架（RTT赛高！）。
使用的开发环境为RT-Thread Studio ,选择基于开发板创建工程。再是能SPI驱动就可以了。

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/f72e86db0264e814d815d7aaa380fd87.png)
我手上的SPI驱动模块只有屏幕和W25Q64，屏幕驱动比较简单，所以我选择了这种方式。
使用的模块为1.3寸ST7789屏幕

![screenshot_IMG20230506224435.jpg](https://oss-club.rt-thread.org/uploads/20230506/b638275e10e0dab75573888666395f59.jpg.webp)
随后是移植屏幕的驱动部分，参考了别人写的。

[https://github.com/Floyd-Fish/ST7789-STM32.git](https://github.com/Floyd-Fish/ST7789-STM32.git)  
[https://github.com/Rbb666/ILI9341.git](https://github.com/Rbb666/ILI9341.git)

参考后的程序如下
```c
rt_err_t  _spi_lcd_init(void)
{
    rt_err_t res = RT_EOK;
    Lcd_pin_init();
    spi_device_attach(PKG_ST_7789_SPI_BUS_NAME, PKG_ST_7789_SPI_DEVICE_NAME, PKG_ST_7789_CS_PIN);
    lcd_dev = (struct rt_spi_device *)rt_device_find(PKG_ST_7789_SPI_DEVICE_NAME);
    if (lcd_dev != RT_NULL)
    {
        struct rt_spi_configuration spi_config;
        spi_config.data_width = 8;
        spi_config.max_hz = 20 * 1000 * 1000;
        spi_config.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
        rt_spi_configure(lcd_dev, &spi_config);
    }
    else
    {
        res = -RT_ERROR;
    }

LCD_Init();

return res;
}

INIT_COMPONENT_EXPORT(_spi_lcd_init);
```
注册设备操作如下

```c
rt_err_t spi_device_attach(const char *bus_name, const char *device_name, rt_base_t cs_pin)
{
    RT_ASSERT(bus_name != RT_NULL);
    RT_ASSERT(device_name != RT_NULL);

rt_err_t result = RT_EOK;
    struct rt_spi_device *spi_device;

/* attach the device to spi bus*/
    spi_device = (struct rt_spi_device *)rt_malloc(sizeof(struct rt_spi_device));
    RT_ASSERT(spi_device != RT_NULL);

result=rt_hw_spi_device_attach(bus_name, device_name, cs_pin);
    if (RT_EOK != result)
    {
        LOG_E("%s attach to %s faild, %d\n", device_name, bus_name, result);
    }
    else
    {
        LOG_I("%s attach to %s done", device_name, bus_name);
    }

return result;
}
```
使用的引脚和设备名如下

```c
#define PKG_ST_7789_SPI_BUS_NAME    "spi0"
#define PKG_ST_7789_SPI_DEVICE_NAME "spi01"
#define PKG_ST_7789_DC_PIN  GET_PIN(5, 6)
#define PKG_ST_7789_RES_PIN  GET_PIN(5, 7)
#define PKG_ST_7789_BLK_PIN  GET_PIN(11, 5)
#define PKG_ST_7789_CS_PIN   GET_PIN(0, 5)
```
如下显示，注册成功

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/cb959aefd2fea68aafd8da9059535731.png)

对刷屏进行简单的时间测试

```c
static int lcd_spi_test(void)
{
    uint8_t index = 0;
    uint16_t time_tick0=0,time_tick1=0;

for (index = 0; index < sizeof(color_array) / sizeof(color_array[0]); index++)
    {
        time_tick0=rt_tick_get();
        LCD_Clear(color_array[index]);
        time_tick1=rt_tick_get();
        LOG_I("lcd clear color: %#x", color_array[index]);
        LOG_I("spend time:%d ms\n", time_tick1-time_tick0);
        DELAY(200);
    }

return RT_EOK;
}
MSH_CMD_EXPORT(lcd_spi_test, lcd will fill color => you need init lcd first);
```

![screenshot_image.png](https://oss-club.rt-thread.org/uploads/20230506/006b29f849e65845c155126477c86480.png)

![screenshot_Screenshot_2023-05-06-19-49-10-92_99c04817c0de565.jpg](https://oss-club.rt-thread.org/uploads/20230506/dd1e4b3fba7624487006a64aeba5693b.jpg.webp)

简单测试结束。
[代码gitee链接](https://gitee.com/starry-m/psoc6-spi-testing.git)
后面的测试待续~~~