Thanks sean
I actually wrote my own this week. Once I clean it up a bit I'm going
to post the entire file and how to use it. So in the future people can
use it if they like.
Josh
On Dec 23, 2007, at 8:39 PM, Sean <[EMAIL PROTECTED]> wrote:
Dear
1. SPI_REG、SPIPC0 are defined myself. like below
#define SPI_BASE_ADDR IO_ADDRESS(DAVINCI_SPI_BASE)
#define SPI_REG(reg) (*((volatile unsigned long *)(SPI_BASE_ADDR
+ (reg))))
#define SPIGCR0 0x00
2. This is an actual linux char driver.
I just wrote a simple driver to control a simple device.
Best Regards,
Sean
On Dec 19, 2007 12:55 AM, Joshua Hintze < [EMAIL PROTECTED]> wrote:
Sean,
Thanks for sending this. One thing that I'm not really sure of is
the macros or functions SPI_REG. Where were these defined? Also the
registers SPIPC0 and others. Did you define all of these yourself?
Also this might seem like a stupid question but is this an actual
linux character driver or is this code that you wrote in code
composer studio for the DSP?
Thanks, I plan on getting something going and giving back to the
community since I tried searching the archives and I could not find
anything other than other peoples questions.
Josh
From: Sean [mailto:[EMAIL PROTECTED]
Sent: Tuesday, December 18, 2007 1:34 AM
To: Joshua Hintze; [email protected]
Subject: Re: SPI on Davinci.
Dear Joshua
OK, I give you a simple program segment.
You need to see the document about SPI of DM644x.
==========================================
// --------------------------------
// Reset SPI
// --------------------------------
control=0x00000000;
SPI_REG(SPIGCR0)=control;
mdelay(1);
control=0x00000001;
SPI_REG(SPIGCR0)=control;
// --------------------------------
// Enable SPI CLK & Master
// --------------------------------
control=0x00000003;
SPI_REG(SPIGCR1)=control;
// --------------------------------
// Enable pins : DI、DO、CLK、EN0
// --------------------------------
control=0x00000FFF;
SPI_REG(SPIPC0)=control;
/* --------------------------------
// Set data format in SPIFMT0
// SHIFTDIR in bit 20 set to 1 : LSB
// POLARITY and PHASE in bit 17, 16 set to 0, 1
// PRESCALE in bit 15-8 set to 0, SPI_CLK = SYSCLK5 /
(Prescale + 1)
// CHARLEN in bit 4-0 set to 08 : 8 bit
-------------------------------- */
control=0x0012FF08;
SPI_REG(SPIFMT0)=control;
// --------------------------------
// Set data format for used -> SPIFMT0
// --------------------------------
control=0x00000000 | 0x00 << 24;
SPI_REG(SPIDAT1)=control;
// --------------------------------
// Set hold time and setup time
// --------------------------------
control=0x0000 | 0x03 << 16 | 0x02 << 24;
SPI_REG(SPIDELAY)=control;
// --------------------------------
// Out of reset for SPI
// --------------------------------
control=0x00000001;
SPI_REG(SPIGCR0)=control;
// --------------------------------
// Set Chip Select Default
// CSHOLD -> 1 -> hold SPI_EN0 state -> bit 28
// CSNR -> 3 -> disable all
// --------------------------------
control=SPI_REG(SPIDAT1);
control|=0x3 << 16;
SPI_REG(SPIDAT1)=control;
// --------------------------------
// Enable for transforing
// --------------------------------
control=SPI_REG(SPIGCR1);
control=control | 1 << 24; // enable SPIENA
SPI_REG(SPIGCR1)=control;
=============================================
Send data
control=csnr << 16 | cshold << 28;
control|=buf;
SPI_REG(SPIDAT1)=control;
Read data
control=SPI_REG(SPIBUF);
MSG("SPIBUF = %08X",control);
if(control & (1 << 31))
MSG("!! No Data received ");
else{
while(1){
control=SPI_REG(SPIBUF);
if(control & (1 << 29))
continue;
else
break;
MSG("wait for data receive ...");
}
MSG("receive data : %04X", (control & 0xFFFF));
}
================================
just for reference.
If it has any questions, please let me know , and help me to fix them.
Best Regards,
Sean
On Dec 18, 2007 11:52 AM, Joshua Hintze <[EMAIL PROTECTED]> wrote:
Thanks Sean,
Do you still have the code that I might take a look at?
Josh
On Dec 17, 2007, at 8:45 PM, Sean < [EMAIL PROTECTED]> wrote:
Dear
I write the SPI driver by myself. Just to write the corresponding
registers.
There is no interface driver about SPI, I felt so sad too.
Best Regards,
Sean
On Dec 18, 2007 2:09 AM, Joshua Hintze < [EMAIL PROTECTED]> wrote:
Since nobody answered yet, I'm curious has anybody done SPI
interfacing on the Davinci?
Thanks,
Josh
---
---
---
---
---
---
---------------------------------------------------------------------
Hey guys,
Have any of you interfaced to the SPI port on the Davinci 6446. I
got the i2c working pretty easy using the i2c-dev character driver
but there is no such thing as spidev until linux kernel 2.6.22.
So I'm wondering how others are doing it. Are you writing your own
kernel drivers or is there still a way to do it from user space?
Thanks in advance,
Josh
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
_______________________________________________
Davinci-linux-open-source mailing list
[email protected]
http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
