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al - Audio Library Functions gDP - DP GBI Macros gdSP - General GBI Macros gSP - SP GBI Macros gt - Turbo Microcode RDP gu - Graphics Utilities Math - Math Functions nuSys - NuSystem os - N64 Operating System sp - Sprite Library Functions uh - Host to Target IO 64DD - N64 Disk DriveNintendo® Confidential |
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uhReadRamrom
Format#include <ultrahost.h>
int uhReadRamrom(int fd, void *ramrom_addr, void *data, int nbytes);
Return Value
On success, a value of 0 is returned. Otherwise, a -1 is returned and errno is set to indicate the error.
What This Function Does
The host-to-target IO routines allow a host application to set up a communications channel for the transfer of raw data between the host and the game. They work in concert with OS routines (osReadHost, osWriteHost, osTestHost, osAckRamromRead, and osAckRamromWrite) on the game side.
These routines are part of the Ultra 64 host-side library libultrahost.a, so they are available to the application by adding -lultrahost on the link line.
The uhReadRamrom routine attempts to copy nbytes of data from the ramrom memory, beginning at ramrom_addr. The calling program must supply a data buffer big enough to hold the requested nbytes. In previous releases, calls to uhReadRamrom needed to be paired from the game side with a osAckRamromRead. This is no longer necessary.
Example
The following example shows how a host application can initiate the game and establish a connection to transfer data. This particular sequence guarantees that no handshaking events are lost. By the time the game sends its first packet of data, the host device driver is ready to acknowledge it. Furthermore, the host side application does not attempt to send data to the game before it has booted.
/* Host side code */
main(int argc, char **argv)
{
pid_t pid;
int fd, status;
if ((fd = uhOpenGame("/dev/u64_data")) == -1) {
perror("uhOpenGame");
return(-1);
}
if ((pid = fork()) == -1) {
perror("fork);
return(-1);
} else if (pid == 0) {
(void)execl("/usr/sbin/gload",
"/usr/sbin/gload", 0);
fprintf(stderr, "host: execl(
return(-1);
}
if (uhReadGame(fd, hostBuffer, 4) == -1) {
fprintf(stderr, "uhReadGame %s0,
sys_errlist[errno]);
return(1);
}
if (uhCloseGame(fd) != 0) {
perror("uhCloseGame");
return(-1);
}
if (waitpid(pid, status, WUNTRACED) == -1) {
perror("waitpid");
return(-1);
}
}
/* Game side code */
mainproc(void *arg)
{
osWriteHost(gameBuffer, 4);
osExit();
}
See AlsouhOpenGame
uhCloseGame
uhReadGame
uhWriteGame
uhWriteRamrom
osReadHost
osWriteHost
osTestHost
osAckRamromRead
osAckRamromWrite
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Nintendo® Confidential Warning: all information in this document is confidential and covered by a non-disclosure agreement. You are responsible for keeping this information confidential and protected. Nintendo will vigorously enforce this responsibility. Copyright © 1998 Nintendo of America Inc. All rights reserved Nintendo and N64 are registered trademarks of Nintendo Last updated January 1998 |