【LPC845月饼板】+ W25Qxx SPIFLASH驱动起来，存数据就不怕了

本来准备移植ARM2D图形的，例子还没准备好，下次再说。今天就说说如何驱动SPI flash吧。 LPC845月饼板上有一块spi flash，主要是为了存储一些资源数据等等。LPC845本身flash不够多，到时想做一些lcd显示图片字体的话，资源会不足。后面还会说说如何编写flash的下载算法。下载算法已经基本调好了，可以直接下载数据到flash上了。

进入正题，下面说一下如何驱动spi flash。

要驱动spiflash，首先看看原理图，找到IO管脚，然后初始化管脚，初始化SPI。电路图部分如下：

这里要说明一下，LPC845只有2个SPI外设。lcd屏幕用了一个SPI0,上期WS2812灯用了一个SPI1.所以这个SPIFLASH只能和他们共用一个SPI外设了。我这里是WS2812和SPIFLASH共用SPI1在，分时复用。

下面是spi初始化部分：

void drv_spi_gpio_init(void)
{
    CLOCK_EnableClock(kCLOCK_Iocon);
    CLOCK_EnableClock(kCLOCK_Gpio0);
    CLOCK_EnableClock(kCLOCK_Gpio1);
    
    CLOCK_EnableClock(kCLOCK_Spi0);
    CLOCK_EnableClock(kCLOCK_Spi1);
    
    CLOCK_Select(kSPI0_Clk_From_MainClk);
    CLOCK_Select(kSPI1_Clk_From_MainClk);
    
    RESET_PeripheralReset(kSPI0_RST_N_SHIFT_RSTn);
    RESET_PeripheralReset(kSPI1_RST_N_SHIFT_RSTn);

    gpio_pin_config_t SPILCD_IN_config = {
        .pinDirection = kGPIO_DigitalInput,
        .outputLogic = 1U,
    };
    gpio_pin_config_t SPILCD_IOH_config = {
        .pinDirection = kGPIO_DigitalOutput,
        .outputLogic = 1U,
    };
    gpio_pin_config_t SPILCD_IOL_config = {
        .pinDirection = kGPIO_DigitalOutput,
        .outputLogic = 0U,
    };
    /* Initialize GPIO functionality on pin */
    GPIO_PinInit(GPIO, 0, 7, &SPILCD_IOL_config);//LCD_BLK
    GPIO_PinInit(GPIO, 1, 6, &SPILCD_IOH_config);//LCD_DC
    GPIO_PinInit(GPIO, 1, 7, &SPILCD_IOH_config);//LCD_RST
    GPIO_PinInit(GPIO, 1,18, &SPILCD_IOH_config);//LCD_CS
    GPIO_PinInit(GPIO, 1,19, &SPILCD_IOH_config);//LCD_CLK
    GPIO_PinInit(GPIO, 0, 6, &SPILCD_IOH_config);//LCD_MOSI
    
    GPIO_PinInit(GPIO, 1,13, &SPILCD_IOH_config);//RGB_MOSI
    
    GPIO_PinInit(GPIO, 1,8, &SPILCD_IOH_config); //FLASH_CS
    GPIO_PinInit(GPIO, 1,9, &SPILCD_IN_config); //FLASH_MISO
    GPIO_PinInit(GPIO, 0,12, &SPILCD_IOH_config);//FLASH_CLK
    GPIO_PinInit(GPIO, 0,13, &SPILCD_IOH_config);//FLASH_MOSI
    
    const uint32_t spilcd_ioc = (/* Selects pull-up function */
                              IOCON_PIO_MODE_PULLUP |
                              /* Enable hysteresis */
                              IOCON_PIO_HYS_EN |
                              /* Input not invert */
                              IOCON_PIO_INV_DI |
                              /* Disables Open-drain function */
                              IOCON_PIO_OD_DI |
                              /* Bypass input filter */
                              IOCON_PIO_SMODE_BYPASS |
                              /* IOCONCLKDIV0 */
                              IOCON_PIO_CLKDIV0);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO0_7,  spilcd_ioc);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_6,  spilcd_ioc);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_7,  spilcd_ioc);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_18, spilcd_ioc);    
    
    /* Enables clock for switch matrix.: enable */
    const uint32_t SPI_LCD_CLK = (/* Selects pull-up function */
                                    IOCON_PIO_MODE_PULLUP |
                                    /* Enable hysteresis */
                                    IOCON_PIO_HYS_EN |
                                    /* Input not invert */
                                    IOCON_PIO_INV_DI |
                                    /* Disables Open-drain function */
                                    IOCON_PIO_OD_DI |
                                    /* Bypass input filter */
                                    IOCON_PIO_SMODE_BYPASS |
                                    /* IOCONCLKDIV0 */
                                    IOCON_PIO_CLKDIV0);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_19, SPI_LCD_CLK);

    const uint32_t SPI_LCD_MOSI = (/* Selects pull-up function */
                                    IOCON_PIO_MODE_PULLUP |
                                    /* Enable hysteresis */
                                    IOCON_PIO_HYS_EN |
                                    /* Input not invert */
                                    IOCON_PIO_INV_DI |
                                    /* Disables Open-drain function */
                                    IOCON_PIO_OD_DI |
                                    /* Bypass input filter */
                                    IOCON_PIO_SMODE_BYPASS |
                                    /* IOCONCLKDIV0 */
                                    IOCON_PIO_CLKDIV0);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO0_6, SPI_LCD_MOSI);
    
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_13, SPI_LCD_MOSI);  //RGB_IO=MOSI
    
    const uint32_t SPI_MISO = (/* Selects pull-up function */
                                    0 |
                                    /* Enable hysteresis */
                                    IOCON_PIO_HYS_EN |
                                    /* Input not invert */
                                    IOCON_PIO_INV_DI |
                                    /* Disables Open-drain function */
                                    IOCON_PIO_OD_DI |
                                    /* Bypass input filter */
                                    IOCON_PIO_SMODE_BYPASS |
                                    /* IOCONCLKDIV0 */
                                    IOCON_PIO_CLKDIV0);
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_9, SPI_MISO);   //f_miso

    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO1_8,   spilcd_ioc);    //f_cs
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO0_12,  spilcd_ioc);   //f_clk
    IOCON_PinMuxSet(IOCON, IOCON_INDEX_PIO0_13,  spilcd_ioc);   //f_mosi
    
    CLOCK_EnableClock(kCLOCK_Swm);
    
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI0_SCK,   kSWM_PortPin_P1_19);
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI0_MOSI,  kSWM_PortPin_P0_6);
    
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_MOSI,  kSWM_PortPin_P1_13);
    
    /* Disable clock for switch matrix. */
    CLOCK_DisableClock(kCLOCK_Swm);
    
    spi_master_config_t userConfig = {0};
    uint32_t srcFreq               = 0U;
    /* Note: The slave board using interrupt way, slave will spend more time to write data
     *       to TX register, to prevent TX data missing in slave, we will add some delay between
     *       frames and capture data at the second edge, this operation will make the slave
     *       has more time to prapare the data.
     */
    
    SPI_MasterGetDefaultConfig(&userConfig);
    userConfig.baudRate_Bps           = 30000000;
    userConfig.sselNumber             = kSPI_Ssel0Assert;
    userConfig.clockPolarity          = kSPI_ClockPolarityActiveHigh;
    userConfig.clockPhase             = kSPI_ClockPhaseFirstEdge;
    userConfig.direction              = kSPI_MsbFirst;
    userConfig.delayConfig.preDelay   = 0x0U;
    userConfig.delayConfig.postDelay  = 0x0U;
    userConfig.delayConfig.frameDelay = 0x0U;
    userConfig.delayConfig.transferDelay = 0x0U;
    srcFreq                           = CLOCK_GetFreq(kCLOCK_MainClk);
    SPI_MasterInit(SPI0, &userConfig, srcFreq);
    
    userConfig.baudRate_Bps           = 6000000;
    SPI_MasterInit(SPI1, &userConfig, srcFreq);

}




SPI_Type * spi_table[2]=
{
    SPI0,
    SPI1,
};

void spi_pre_h(void)
{
    CLOCK_EnableClock(kCLOCK_Swm);
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_MISO,  kSWM_PortPin_P1_9);  //F_MISO
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_MOSI,  kSWM_PortPin_P0_13); //F_MOSI
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_SCK ,  kSWM_PortPin_P0_12); //F_CLK
    CLOCK_DisableClock(kCLOCK_Swm);
    SPI_MasterSetBaudRate(SPI1,30000000, CLOCK_GetFreq(kCLOCK_MainClk));
}

void spi_pre_l(void)
{
    CLOCK_EnableClock(kCLOCK_Swm);
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_MOSI,  kSWM_PortPin_P1_13); //RGB_IO
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_MISO,  0XFF);  //
    SWM_SetMovablePinSelect(SWM0, kSWM_SPI1_SCK ,  0XFF);  //
    CLOCK_DisableClock(kCLOCK_Swm);
    SPI_MasterSetBaudRate(SPI1,6000000, CLOCK_GetFreq(kCLOCK_MainClk));
}

void spi_writebyte(uint8_t index,uint8_t TxData)
{
    spi_table[index]->TXDATCTL = TxData | 0X077E0000;
    while ((spi_table[index]->STAT & SPI_STAT_TXRDY_MASK) == 0U){;}
}

uint8_t spi_readbyte(uint8_t index)
{
    uint8_t re;
    spi_table[index]->TXDATCTL = 0xff | 0X073E0000;
    while ((spi_table[index]->STAT & SPI_STAT_RXRDY_MASK) == 0U){;}
    re = spi_table[index]->RXDAT & 0XFF;
    return re;
}


uint8_t spi_writebuff(uint8_t index,uint8_t *buff,uint32_t len)
{
    volatile uint32_t i;
    for(i=0; i<len; i++)
    {
        spi_writebyte(index,buff[i]);
    }    
    return 0;
}

uint8_t spi_readbuff(uint8_t index,uint8_t *buff,uint32_t len)
{
    volatile uint32_t i;
    for(i=0; i<len; i++)
    {
        buff[i] = spi_readbyte(index);
    }   
    return 0;
}

void spi_write_read(uint8_t index,uint8_t * wbuf,uint32_t wl,uint8_t * rbuf,uint32_t rl)
{
    if((wbuf != NULL) && (wl != 0))
    {
        while(wl--)
        {
            spi_writebyte(index,*wbuf++);
        }
    }

    if((rbuf != NULL) && (rl != 0))
    {
        while(rl--)
        {
            *rbuf++ = spi_readbyte(index);
        }
    }
}

W25QXX的驱动是以前写好的，直接拿来用，主要实现了SPI读写接口就行。

下面对W25QXX flash读写测试一下。

主要测试代码：

    for (int i = 0; i < BUFFER_SIZE; i++)
    {
        txBuffer[i] = i % 256;
        rxBuffer[i] = 0U;
    }
    DbgConsole_Printf("W25QXX Erase Chip.rn");
    W25QXX_EraseChip();
    DbgConsole_Printf("W25QXX Read Data.rn");
    W25QXX_Read(0,rxBuffer,64);
    for (int i = 0; i < BUFFER_SIZE; i++)
    {
        DbgConsole_Printf("%02X ",rxBuffer[i]);
    } 
    DbgConsole_Printf("W25QXX Write Data.rn");
    W25QXX_Write_NoCheck(0,txBuffer,BUFFER_SIZE);
    DbgConsole_Printf("W25QXX Read Data to Check.rn");
    for (int j = 0; j < BUFFER_SIZE; j++)
    {
        W25QXX_Read(0 + j*BUFFER_SIZE,rxBuffer,64);
        for (int i = 0; i < BUFFER_SIZE; i++)
        {
            DbgConsole_Printf("%02X ",rxBuffer[i]);
        }
        DbgConsole_Printf("n");
    }

通过串口观察数据，写入和读出一致。

好了，本次到此结束。