MCU BootloaderのトピックRe: KE02 W25Q16

KE02 W25Q16

huyrua291996 — Tue, 28 Nov 2017 11:32:47 GMT

Hi,

Can KE02 used with external spi flash w25q16?

If yes, what's exactly baudrate and clock can I config.

Here is datasheet of w25q16

But I dont know the config baudrate and clock in SPI

This code I write with 250000 baudrate and bus clock default is 16MHz

And when I send the deviceID cmd to the SPI flash, it doesnt response

Re: KE02 W25Q16

kerryzhou — Tue, 05 Dec 2017 08:19:42 GMT

Hi Huy,

Of course you can use the KE02 to control the external spi flash w25q16.

But, to meet the external flash demand, you need to use the GPIO as the CS control pin instead of the hardware SPI CS pin.

About the KE02 SPI baudrate and clock configuration , you can refer to our KE driver code which can be downloaded from this link:

FRDM-KEXX Driver Library Package

Please refer to the SPI project.

void SPI_SetBaudRate(SPI_Type *pSPI,uint32_t u32BusClock,uint32_t u32Bps)
{
   uint32_t u32BitRateDivisor;
   uint8_t u8Sppr;
   uint8_t u8Spr;
    uint8_t u8ReadFlag;
   u32BitRateDivisor = u32BusClock/u32Bps; /* calculate bit rate divisor */

    u8ReadFlag = 0;
    /* find best fit SPPR and SPR */
    for (u8Spr = 0; u8Spr <= 8; u8Spr++)
    {
        for(u8Sppr = 0; u8Sppr <= 7; u8Sppr++)
        {
            if((u32BitRateDivisor>>(u8Spr+1))<=(u8Sppr+1))
            {
                u8ReadFlag = 1;
                break;
            }
        }
        if(u8ReadFlag)
        {
            break;
        }
    }
    if(u8Sppr >=8)
    {
        u8Sppr = 7;
    }
    if(u8Spr >8)
    {
        u8Spr = 8;
    }
    /* set bit rate */
    pSPI->BR = SPI_BR_SPPR(u8Sppr) | SPI_BR_SPR(u8Spr);
}

If your SPI can't work, I suggest you use the logic analyzer to check the SPI wave, whether the wave meet your external flash demand or not.

Wish it helps you!

Have a great day,
Kerry

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Re: KE02 W25Q16

huyrua291996 — Tue, 05 Dec 2017 14:11:47 GMT

Thanks Zhou,

My SPI is running because I config CS pin as GPIO

But when I config SSOE and MODFEN set to 1, it's not work right?

Re: KE02 W25Q16

kerryzhou — Wed, 06 Dec 2017 09:10:50 GMT

Hi Huy,

As I know, yes.

Because the KE02 SPI CS will pull up after each SPI byte send, this won't meet your external SPI flash demand.

That's why I suggest you configure the CS as GPIO, and use the GPIO to control the CS function.

Wish it helps you!

Kerry

Re: KE02 W25Q16

huyrua291996 — Wed, 06 Dec 2017 15:51:18 GMT

Thanks Zhou