Spi Sspbuf - Page 3 - Electronic Circuits Projects Diagrams Free

richb · 9th March 2007, 01:07 AM

Hey Guys

I have partial good news, after writing a function to check the availability of the TX register in the UART suggested by Papabravo, and waiting until the TX was empty, i am now able to successfully send my string without any issues.

\o/

The other issue I am now facing is getting the MAX3100 UART to interrupt on the IRQ line. I just can't seem to get it to produce a signal.

My UART setup is:

Code:

void spi_init()
{
	STAT_CKE = 1;
	spi_write(0b11000100, 0b00001011);
	while(spi_ready(0b01000000, 0b00000000));
}

I am setting the RM bit (data available in the receive register) but I am not getting a signal generated when data becomes available.

I'm not sure if I am setting up the chip correctly. The datasheet talks about putting the chip into software shutdown mode (SHDN) and applying the settings. Anyone have an ideas about this?

Thanks
Regards
Rich

Papabravo · 14th March 2007, 08:22 PM

You want to bring the chip out of shutdown and you need to configure the IRQ line for the interrupts that it should respond to. Software shutdown is a low power mode that conserves power but may cause you to miss traffic.

It would appear that a Read Data Operation clears the IRQ.

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9th March 2007, 01:07 AM	(permalink)
richb	Hey Guys I have partial good news, after writing a function to check the availability of the TX register in the UART suggested by Papabravo, and waiting until the TX was empty, i am now able to successfully send my string without any issues. \o/ The other issue I am now facing is getting the MAX3100 UART to interrupt on the IRQ line. I just can't seem to get it to produce a signal. My UART setup is: Code: void spi_init() { STAT_CKE = 1; spi_write(0b11000100, 0b00001011); while(spi_ready(0b01000000, 0b00000000)); } I am setting the RM bit (data available in the receive register) but I am not getting a signal generated when data becomes available. I'm not sure if I am setting up the chip correctly. The datasheet talks about putting the chip into software shutdown mode (SHDN) and applying the settings. Anyone have an ideas about this? Thanks Regards Rich

14th March 2007, 08:22 PM	(permalink)
Papabravo	You want to bring the chip out of shutdown and you need to configure the IRQ line for the interrupts that it should respond to. Software shutdown is a low power mode that conserves power but may cause you to miss traffic. It would appear that a Read Data Operation clears the IRQ. Last edited by Papabravo; 14th March 2007 at 08:31 PM.