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Direct access of PSP remote control UART

 
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chrismulhearn



Joined: 22 Feb 2006
Posts: 80
PostPosted: Thu Mar 02, 2006 2:44 am    Post subject: Direct access of PSP remote control UART Reply with quote
Has anyone directly accessed the PSP remote control's uart? By direct access, I mean completely avoiding system calls, and only using the memory-mapped config registers.

If so, could you give me some sample code?

Thanks!!!

-Chris
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groepaz



Joined: 01 Sep 2005
Posts: 305
PostPosted: Mon Mar 06, 2006 11:10 am    Post subject: Reply with quote
doesnt the debug stuff in the pspsdk do it exactly like that? (minus the systemcalls that are abused to shut down the hprm driver)
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chrismulhearn



Joined: 22 Feb 2006
Posts: 80
PostPosted: Tue Mar 07, 2006 2:44 am    Post subject: Reply with quote
I'm not sure, I'm trying to not use the SDK.

Well, here is some nice simple code to read and write from the serial port, assuming you are in kernel mode!

Quote:

/*
* Chris Mulhearn
*
* PSP Serial port IO defs
*/
#ifndef SERIALPORT_H
#define SERIALPORT_H

struct serialport {
int * txbuf; // tx + rx same on psp, 0xbe50 0000, bits 7..0
int * rxbuf;
int * status;
#define serialport_txfull ((int)0x00000020)
#define serialport_rxempty ((int)0x00000010)
};

int serialport_write(struct serialport * port, char * buffer, int length, int timeout);
int serialport_read(struct serialport * port, char * buffer, int length, int timeout);

extern struct serialport psprc_serialport; // instantiated in serialport.c

#endif


Quote:

/*
* Chris Mulhearn
*
* PSP serial port IO routines
*/
#include "serialport.h"


/* instantiate "serialport" that points to psp remote control serial port */
struct serialport psprc_serialport = {
.txbuf = (int*)0xbe500000,
.rxbuf = (int*)0xbe500000,
.status = (int*)0xbe500018,
};

int serialport_write(struct serialport * port, char * buffer, int length, int timeout) {
int tcnt, bcnt;
if(length <= 0) return 0;
bcnt = 0;
while(1) {
tcnt = 0;
while( (*(port->status)) & serialport_txfull) {
tcnt++;
if(tcnt > timeout) break;
}
if(tcnt > timeout) break;
/*if(buffer[bcnt])*/ *(port->txbuf) = buffer[bcnt];
/*else *(port->txbuf) = '.'; */
bcnt++;
if(bcnt == length) break;
}
return bcnt;
}

int serialport_read(struct serialport * port, char * buffer, int length, int timeout) {
int tcnt, bcnt;
if(length <= 0) return 0;
bcnt = 0;
while(1) {
tcnt = 0;
while(( (*(port->status)) & serialport_rxempty)) {
tcnt++;
if(tcnt > timeout) break;
}
if(tcnt > timeout) break;
buffer[bcnt] = *((char*)port->rxbuf);
bcnt++;
if(bcnt == length) break;
}
return bcnt;
}



Let me know if this is useful to anyone!
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