Using AT25DF321A with MKL05Z32

andreitatar — Fri, 01 Feb 2013 08:42:34 GMT

I have the FRDM-KL05Z dev board and I'm trying to use AT25DF321A flash chip via SPI.

This is basically all the code I'm using:

uint8_t spi_ReadWriteByte(uint8_t data)
{
  while (!(SPI0_BASE_PTR->S & SPI_S_SPTEF_MASK)); //wait TX to be empty
  SPI0_BASE_PTR->D = data;
  while (!(SPI0_BASE_PTR->S & SPI_S_SPRF_MASK)); //wait RX to be full

  volatile uint8_t retData = SPI0_BASE_PTR->D;
  return retData;
}

#define EXT_SELECT() MEM_CS_MODULE_BASE_ADDRESS->PCOR = MEM_CS_PORT_MASK
#define EXT_DESELECT() MEM_CS_MODULE_BASE_ADDRESS->PSOR = MEM_CS_PORT_MASK

#define CMD_STATUS_READ		0x05
#define CMD_STATUS_WRITE	0x01
#define CMD_ERASE_CHIP		0xC7
#define CMD_WR_ENABLE		0x06
#define CMD_PROGRAM			0x02
#define CMD_READ			0x03

static uint8_t readStatus();

#define WAIT_WHILE_BUSY()

while (readStatus() & 0x01)

#define SEND_ADDRESS(addr)			\
	spi_ReadWriteByte((addr >> 16) & 0xFF);	\
	spi_ReadWriteByte((addr >> & 0xFF);	\
	spi_ReadWriteByte(addr & 0xFF)

#define CMD(cmd)			\
	EXT_SELECT();			\
	spi_ReadWriteByte(cmd);	\
	EXT_DESELECT()

#define CMD_AND_WRITE(cmd, x)		\
	EXT_SELECT();			\
	spi_ReadWriteByte(cmd);		\
	spi_ReadWriteByte(x);		\
	EXT_DESELECT()

#define CMD_AND_READ(cmd, x)		\
	EXT_SELECT();			\
	spi_ReadWriteByte(cmd);		\
	x = spi_ReadWriteByte(0xAA);	\
	EXT_DESELECT()

static uint8_t readStatus()

{

	uint8_t status;
	CMD_AND_READ(0x05, status);
	return status;

}

void extRead(uint32_t address, uint8_t *buffer, uint16_t count)

{

	EXT_SELECT();
	spi_ReadWriteByte(CMD_READ); //read command
	SEND_ADDRESS(address);
	while (count --) *buffer++ = spi_ReadWriteByte(0x00);
	EXT_DESELECT();

}

static void extUnprotect(void)

{

	CMD(CMD_WR_ENABLE);
	CMD_AND_WRITE(CMD_STATUS_WRITE, 0x00);

}

void extWrite(uint32_t address, uint8_t *buffer, uint16_t count)

{

	extUnprotect();
	CMD(CMD_WR_ENABLE);

	EXT_SELECT();
	spi_ReadWriteByte(CMD_PROGRAM);
	SEND_ADDRESS(address);
	while (count--) spi_ReadWriteByte(*buffer++);
	EXT_DESELECT();

	WAIT_WHILE_BUSY();

}

void extErase(void)

{

	extUnprotect();
	CMD(CMD_WR_ENABLE);
	CMD(CMD_ERASE_CHIP);
	WAIT_WHILE_BUSY();

}

The erase function takes about 20-30 sec, so it seems to work well, but when I send auxBuffer over serial, all I get is 0xFF's.

rxBuffer containts the correct data, everything seems just fine, but it just won't work. I tried different addresses, but same thing.

SPI is working, status seems correct (0x10 - 1st byte, 0x00 - 2nd byte), and if I read manufacturer id, I get 0x1F, 0x47, 0x01, 0x00. I also tried different SPI clocks (from few 100 kHz to 10 MHz), tried 2 different chips and they have the same exact behavior, tried adding delays between/after asserting/deasserting /CS.

I also tried setting clock polarity to high (I'm using processor expert to initialize SPI) and when I write a page (256 bytes) of AA 55 AA 55's, I get in return 55 2A D5 2A D5 2A...

/Hold and /WP pins are tied to VCC.

I'm waiting for my logic analyzer delivery I just ordered. I think the problem is an uneven number of bits in the write command but I'm not really sure...

Any other suggestions until then?

Thanks

Re: Using AT25DF321A with MKL05Z32

andreitatar — Thu, 07 Feb 2013 10:56:15 GMT

Got it working! I had an inductive ringing effect (long wires all around the dev board). Added a 50 ohm resistor in series on the clock signal line and it works great now. Even at 10 MHz.

Kinetis MicrocontrollersのトピックRe: Using AT25DF321A with MKL05Z32

Using AT25DF321A with MKL05Z32

Re: Using AT25DF321A with MKL05Z32