发新帖我要提问
返回列表
打印
[开发板]

【CW32L031CxTx StartKit评估板测评】6.SPI的使用

[复制链接]
472|0
手机看帖
扫描二维码
随时随地手机跟帖
跳转到指定楼层
楼主
yuyy1989|  楼主 | 2023-9-29 13:22 | 只看该作者 |只看大图 回帖奖励 |倒序浏览 |阅读模式
CW32L031, 开发板, spi, flash
#申请原创# @21小跑堂  

串行外设接口（SPI）是一种同步串行数据通信接口，常用于 MCU 与外部设备之间进行同步串行通信，CW32L031 内部集成 1 个串行外设 SPI 接口，在开发板上SPI接了一颗W25Q64的FLASH

开发板上实际焊接的是芯源自家的CW25Q64，在https://www.whxy.com/support/filelist/23这里能下载到手册
先来尝试用SPI读取FLAH的ID并用串口打印出来，初始化SPI接口
复制
void spi_init()

{

    SPI_InitTypeDef  SPI_InitStructure = {0};

    GPIO_InitTypeDef GPIO_InitStructure = {0};

    __RCC_GPIOA_CLK_ENABLE();

    __RCC_SPI1_CLK_ENABLE();

    

    PA10_AFx_SPI1SCK();

    PA11_AFx_SPI1MISO();

    PA12_AFx_SPI1MOSI();

    PA15_AFx_SPI1CS();

    

    GPIO_InitStructure.Pins = GPIO_PIN_10|GPIO_PIN_12|GPIO_PIN_15;

    GPIO_InitStructure.Mode = GPIO_MODE_OUTPUT_PP;

    GPIO_Init(CW_GPIOA, &GPIO_InitStructure);

    

    GPIO_InitStructure.Pins = GPIO_PIN_11;

    GPIO_InitStructure.Mode = GPIO_MODE_INPUT;

    GPIO_Init(CW_GPIOA, &GPIO_InitStructure);

    

    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;    // 双线全双工

    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;                         // 主机模式

    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;                     // 帧数据长度为8bit

    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;                           // 时钟空闲电平为高

    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;                          // 第二个边沿采样

    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;                             // 片选信号由SSI寄存器控制

    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;    // 波特率为PCLK的8分频

    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;                    // 最高有效位 MSB 收发在前

    SPI_InitStructure.SPI_Speed = SPI_Speed_High;                         // 高速SPI



    SPI_Init(CW_SPI1, &SPI_InitStructure);

    SPI_Cmd(CW_SPI1, ENABLE);

    

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

}
读Flash id，需要注意的是在全双工模式下读之前要先发送，不然无法接受从设备发过来的数据

复制
uint8_t spi_sendbyte(SPI_TypeDef* SPIx,uint8_t data)

{

    while(SPI_GetFlagStatus(SPIx, SPI_FLAG_TXE) == RESET);

    SPI_SendData(SPIx,data);

    while(SPI_GetFlagStatus(SPIx, SPI_FLAG_RXNE) == RESET);

    return SPI_ReceiveData(SPIx)&0xFF;

}



uint8_t spi_readbyte(SPI_TypeDef* SPIx)

{

    return spi_sendbyte(SPIx,0x00);

}



void cw25q64_readflashid()

{

    uint8_t data[8] = {0},i=0;

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x90);

    spi_sendbyte(CW_SPI1,0x00);

    spi_sendbyte(CW_SPI1,0x00);

    spi_sendbyte(CW_SPI1,0x00);

    data[0] = spi_readbyte(CW_SPI1);

    data[1] = spi_readbyte(CW_SPI1);

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash read Manufacturer/Device ID %02X %02X\n",data[0],data[1]);

    

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x9F);

    data[0] = spi_readbyte(CW_SPI1);

    data[1] = spi_readbyte(CW_SPI1);

    data[2] = spi_readbyte(CW_SPI1);

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash read JEDEC ID %02X %02X%02X\n",data[0],data[1],data[2]);

    

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x5A);

    spi_sendbyte(CW_SPI1,0x00);

    spi_sendbyte(CW_SPI1,0x00);

    spi_sendbyte(CW_SPI1,0xF8);

    spi_sendbyte(CW_SPI1,0x00);

    while(i<8)

    {

        data[i] = spi_readbyte(CW_SPI1);

        i++;

    }

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash read Unique Id %02X%02X%02X%02X%02X%02X%02X%02X\n",data[0],data[1],data[2],data[3],data[4],data[5],data[6],data[7]);

}
运行结果

Device ID的ID7 - ID0这个值实际读到的和手册不一致

Unique Id是01开头F6结尾

接下来尝试写入数据，先要使能写入，然后擦除，等待擦除完成后写入数据
复制
void cw25q64_waitwritefinish()

{

    uint8_t writebusy = 1;

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x05);

    while(writebusy != 0)

    {

        writebusy = spi_readbyte(CW_SPI1)&0x01;

    }

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash write finish\n");

}



void cw25q64_writeenable()

{

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x06);

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash write enabled\n");

}



void cw25q64_erasesector(uint32_t secteraddr)

{

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x20);

    spi_sendbyte(CW_SPI1,(secteraddr >> 16)&0xFF);

    spi_sendbyte(CW_SPI1,(secteraddr >> 8)&0xFF);

    spi_sendbyte(CW_SPI1,secteraddr&0xFF);

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash erase sector %08X\n",secteraddr);

}



void cw25q64_writepagedata(uint32_t pageaddr,uint8_t *datas,uint16_t len)

{

    uint16_t index = 0; 

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x02);

    spi_sendbyte(CW_SPI1,(pageaddr >> 16)&0xFF);

    spi_sendbyte(CW_SPI1,(pageaddr >> 8)&0xFF);

    spi_sendbyte(CW_SPI1,pageaddr&0xFF);

    while(index < len)

    {

        spi_sendbyte(CW_SPI1,datas[index]);

        index += 1;

    }

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash write page %08X data:\n",pageaddr);

    index = 0;

    while(index < len)

    {

        printf("%02X ",datas[index]);

        index += 1;

    }

    printf("\n");

}



void cw25q64_readdata(uint32_t addr,uint8_t *datas,uint16_t len)

{

    uint16_t index = 0; 

    SPI_NSSInternalSoftwareConfig(CW_SPI1,0);

    spi_sendbyte(CW_SPI1,0x03);

    spi_sendbyte(CW_SPI1,(addr >> 16)&0xFF);

    spi_sendbyte(CW_SPI1,(addr >> 8)&0xFF);

    spi_sendbyte(CW_SPI1,addr&0xFF);

    while(index < len)

    {

        datas[index] = spi_readbyte(CW_SPI1)&0xFF;

        index += 1;

    }

    SPI_NSSInternalSoftwareConfig(CW_SPI1,1);

    printf("Flash read %08X data:\n",addr);

    index = 0;

    while(index < len)

    {

        printf("%02X ",datas[index]);

        index += 1;

    }

    printf("\n");

}

int32_t main(void)

{

    uint8_t flash_testdata[50] = {0},index = 0;

    RCC_HSI_48M_init();

    RCC_HCLKPRS_Config(RCC_HCLK_DIV1);

    RCC_PCLKPRS_Config(RCC_PCLK_DIV1);

    uart1_init();

    spi_init();

    cw25q64_readflashid();

    while(index < 50)

    {

        index += 1;

        flash_testdata[index] = index;

    }

    cw25q64_writeenable();

    cw25q64_erasesector(0);

    cw25q64_waitwritefinish();

    cw25q64_writeenable();

    cw25q64_writepagedata(0,flash_testdata,50);

    cw25q64_waitwritefinish();

    cw25q64_readdata(0,flash_testdata,50);

    while (1)

    {

    }

}
运行结果

除了读写FLASH，这块LCD12864的屏幕也可以用SPI驱动

驱动它要用到5个IO，CS RST A0 MOSI SCK，SPI只用发送模式就可以了MISO可以不用，这里换一组IO
复制
YUYY_HS12864G18B_DEV_t hs12864_dev;

void hs12864g18b_init(void)

{

    GPIO_InitTypeDef gpiodef;

    hs12864_dev.cs.gpio = CW_GPIOA;

    hs12864_dev.cs.pin = GPIO_PIN_4;

    hs12864_dev.rst.gpio = CW_GPIOA;

    hs12864_dev.rst.pin = GPIO_PIN_3;

    hs12864_dev.a0.gpio = CW_GPIOA;

    hs12864_dev.a0.pin = GPIO_PIN_2;

    hs12864_dev.sck.gpio = CW_GPIOA;

    hs12864_dev.sck.pin = GPIO_PIN_5;

    hs12864_dev.mo.gpio = CW_GPIOA;

    hs12864_dev.mo.pin = GPIO_PIN_7;

    

    __RCC_GPIOA_CLK_ENABLE();

    gpiodef.Pins = GPIO_PIN_5|GPIO_PIN_7|GPIO_PIN_4|GPIO_PIN_3|GPIO_PIN_2;

    gpiodef.Mode = GPIO_MODE_OUTPUT_PP;

    gpiodef.IT = GPIO_IT_NONE;

    GPIO_Init(CW_GPIOA,&gpiodef);

    

        #if(YUYY_HS12864G18B_USE_SOFT_SPI)

    yuyy_hs12864g18b_set_spigpio(NULL,&hs12864g18b_gpio_config);

    #else

    __RCC_SPI1_CLK_ENABLE();;

    PA05_AFx_SPI1SCK();

    PA07_AFx_SPI1MOSI();

    SPI_InitTypeDef spidef;

    spidef.SPI_Direction = SPI_Direction_1Line_TxOnly;

    spidef.SPI_Mode = SPI_Mode_Master;

    spidef.SPI_DataSize = SPI_DataSize_8b;

    spidef.SPI_CPOL = SPI_CPOL_High;

    spidef.SPI_CPHA = SPI_CPHA_2Edge;

    spidef.SPI_NSS = SPI_NSS_Soft;

    spidef.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_8;

    spidef.SPI_FirstBit = SPI_FirstBit_MSB;

    spidef.SPI_Speed = SPI_Speed_High;

    SPI_Init(CW_SPI1,&spidef);

    SPI_Cmd(CW_SPI1, ENABLE);

    hs12864_dev.spix = CW_SPI1;

    #endif

    yuyy_hs12864g18b_init(&hs12864_dev);

} 



int32_t main(void)

{

    RCC_HSI_48M_init();

    RCC_HCLKPRS_Config(RCC_HCLK_DIV1);

    RCC_PCLKPRS_Config(RCC_PCLK_DIV1);

    hs12864g18b_init();

    yuyy_hs12864g18b_clear_screen(&hs12864_dev);

    yuyy_hs12864g18b_display_string_8x16(&hs12864_dev,0,0,0,(uint8_t *)"CW32L031TEST");

    yuyy_hs12864g18b_display_string_8x16(&hs12864_dev,0,2,0,(uint8_t *)"Drivered by SPI");

    yuyy_hs12864g18b_display_string_8x16(&hs12864_dev,0,4,0,(uint8_t *)"Code by yuyy1989");

    while (1)

    {

    }

}
运行效果

另外SPI还能用来驱动WS2812或SK6812这样的幻彩灯珠，这里就先不演示了



使用特权

评论回复 赏
返回列表
发新帖 我要提问
高级模式
B Color Image Link Quote Code 收费 Smilies
您需要登录后才可以回帖 登录 | 注册

本版积分规则

yuyy1989 Image

145

主题

695

帖子

6

粉丝