topic Re: Processor Expert config for SD Card - MC9S08AW32 in 8-bit Microcontrollers

Processor Expert config for SD Card - MC9S08AW32

marcov — Thu, 08 May 2008 17:21:26 GMT

Hi guys,
I'm using the SPI bus on the MC9S08AW32 to access to an SD card.

In CodeWarrior I've added through Processor Expert the SPI bus setup in hardware mode. Using the default configuration for master I have some trouble interfacing with the card.

So can u please tell me if this configuration is right?

regards,
marco

Message Edited by NLFSJ on 2008-05-08 06:21 AM

Re: Processor Expert config for SD Card - MC9S08AW32

Roach — Fri, 16 May 2008 01:17:20 GMT

I can see that your shift clock idle polarity is High, I think it has to be low to communicate with SD card. Attached is my PE config.

Message Edited by Roach on 2008-05-15 07:18 PM

SD_SPI2.jpg

Message Edited by t.dowe on 2009-10-27 12:36 PM

Re: Processor Expert config for SD Card - MC9S08AW32

marcov — Fri, 16 May 2008 02:34:34 GMT

thanks! i will give it a try....

my problem at the moment is that I randomly read a shifted bit, eg 0x04 instead of 0x01.... maybe your hint will solve this.

Re: Processor Expert config for SD Card - MC9S08AW32

erooll — Thu, 29 May 2008 05:09:03 GMT

Hi. marcov, actually I use a SD card like a storage device, even I have implement a FAT file system to store data.
Usually I set all modules of microcontroller writing directly code.
This is my settings that I have used in a GT60, an recently in a QE128

SPI1BR = 0x00; //Baud Rate @ fbus/2

   SPI1C2 = 0x00;

   SPI1C1 = 0b01011100;
    /*        ||||||||-->LSBFE: LSB first
              |||||||--->SSOE: Slave select output enable
              ||||||---->CPHA: Clock Phase
              |||||----->CPOL: Clock Polarity
              ||||------>MSTR: Master/Slave Mode Select
              |||------->SPTIE: SPI Transmit Interrupt Enable
              ||-------->SPE: SPI Sytem Enable
              |--------->SPIE: SPI Interrupt Enable (for SPRF and MODF)
    */