using the 9S08AW32 with serial (SPI) Flash

baddad — Wed, 04 Jul 2007 01:08:19 GMT

I am using the 9S08AW32 with the Intel QH25F160S33B8 serial (SPI) flash (attached).

I have used SPI in the past with assembly, but was hoping to move to C this time. Even after looking at other examples, I still get no data back from the flash. Here is my code for the simple task of reading the manufactuer ID code (command=0x9F, no address needed and 3 bytes are returned)

// read the manufacture ID and Device ID
void Read_ID(void) {
SPI_TX1(0x9F);              // Send read ID command
ID[0] = SPI_TX1(0);        // Send read MFG ID code
ID[1] = SPI_TX1(0);        // Send read ID code 1st byte
ID[2] = SPI_TX1(0);        // Send read ID code 2nd byte

}

// spi transmit byte function

byte SPI_TX1 (byte sendval)
{
   while (!SPI1S_SPTEF);
   SPI1D = sendval;
   while (!SPI1S_SPRF);
   return (SPI1D);
}

The calling routine is handling the chip select (verified by o-scope).

I'm hoping I've just overlooked something simple.

Any help is greatly appreciated.

BadDad

Message Edited by baddad on 2007-07-03 07:20 PM

25FxxxS33.pdf

Message Edited by t.dowe on 2009-10-20 01:28 PM

Re: using the 9S08AW32 with serial (SPI) Flash

baddad — Wed, 04 Jul 2007 02:49:43 GMT

Nevermind.......

My clock polarity was wrong.

Works great now.

8-bit Microcontrollersのトピックusing the 9S08AW32 with serial (SPI) Flash

using the 9S08AW32 with serial (SPI) Flash

Re: using the 9S08AW32 with serial (SPI) Flash