mirror of
https://github.com/ApacheThunder/GBA-Exploader.git
synced 2025-06-18 19:45:39 -04:00
540515c7fc
* Can now use gbaframes specific to a gba rom being loaded to ram/flash. Have a bmp file with filename matching the game rom being flashed in GBA_SIGN path. If it finds a matching BMP it will use that before falling back to the default gbaframe.bmp paths. * nds-bootstrap now used for booting retail NDS roms from file browser. Note that currently GBA-Exploader does not create new save files so only games with existing save files (currently hardcoded to GBA_SAV path like with GBA games) can be booted with this.
132 lines
3.9 KiB
C
132 lines
3.9 KiB
C
/*---------------------------------------------------------------------------------
|
|
|
|
I2C control for the ARM7
|
|
|
|
Copyright (C) 2011
|
|
Dave Murphy (WinterMute)
|
|
|
|
This software is provided 'as-is', without any express or implied
|
|
warranty. In no event will the authors be held liable for any
|
|
damages arising from the use of this software.
|
|
|
|
Permission is granted to anyone to use this software for any
|
|
purpose, including commercial applications, and to alter it and
|
|
redistribute it freely, subject to the following restrictions:
|
|
|
|
1. The origin of this software must not be misrepresented; you
|
|
must not claim that you wrote the original software. If you use
|
|
this software in a product, an acknowledgment in the product
|
|
documentation would be appreciated but is not required.
|
|
2. Altered source versions must be plainly marked as such, and
|
|
must not be misrepresented as being the original software.
|
|
3. This notice may not be removed or altered from any source
|
|
distribution.
|
|
|
|
---------------------------------------------------------------------------------*/
|
|
|
|
#include <nds/arm7/i2c.h>
|
|
#include <nds/bios.h>
|
|
|
|
static u32 i2cCurrentDelay = 0;
|
|
|
|
//---------------------------------------------------------------------------------
|
|
void i2cDelay() {
|
|
//---------------------------------------------------------------------------------
|
|
i2cWaitBusy();
|
|
swiDelay(i2cCurrentDelay);
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
void i2cStop(u8 arg0) {
|
|
//---------------------------------------------------------------------------------
|
|
if(i2cCurrentDelay) {
|
|
REG_I2CCNT = (arg0 << 5) | 0xC0;
|
|
i2cDelay();
|
|
REG_I2CCNT = 0xC5;
|
|
} else REG_I2CCNT = (arg0 << 5) | 0xC1;
|
|
}
|
|
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cGetResult() {
|
|
//---------------------------------------------------------------------------------
|
|
i2cWaitBusy();
|
|
return (REG_I2CCNT >> 4) & 0x01;
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cGetData() {
|
|
//---------------------------------------------------------------------------------
|
|
i2cWaitBusy();
|
|
return REG_I2CDATA;
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
void i2cSetDelay(u8 device) {
|
|
//---------------------------------------------------------------------------------
|
|
if (device == I2C_PM ) {
|
|
i2cCurrentDelay = 0x180;
|
|
} else {
|
|
i2cCurrentDelay = 0;
|
|
}
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cSelectDevice(u8 device) {
|
|
//---------------------------------------------------------------------------------
|
|
i2cWaitBusy();
|
|
REG_I2CDATA = device;
|
|
REG_I2CCNT = 0xC2;
|
|
return i2cGetResult();
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cSelectRegister(u8 reg) {
|
|
//---------------------------------------------------------------------------------
|
|
i2cDelay();
|
|
REG_I2CDATA = reg;
|
|
REG_I2CCNT = 0xC0;
|
|
return i2cGetResult();
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cWriteRegister(u8 device, u8 reg, u8 data) {
|
|
//---------------------------------------------------------------------------------
|
|
i2cSetDelay(device);
|
|
int i;
|
|
|
|
for(i = 0; i < 8; i++) {
|
|
if((i2cSelectDevice(device) != 0) && (i2cSelectRegister(reg) != 0)) {
|
|
i2cDelay();
|
|
REG_I2CDATA = data;
|
|
i2cStop(0);
|
|
if(i2cGetResult() != 0) return 1;
|
|
}
|
|
REG_I2CCNT = 0xC5;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
//---------------------------------------------------------------------------------
|
|
u8 i2cReadRegister(u8 device, u8 reg) {
|
|
//---------------------------------------------------------------------------------
|
|
i2cSetDelay(device);
|
|
int i;
|
|
|
|
for(i = 0; i < 8; i++) {
|
|
|
|
if((i2cSelectDevice(device) != 0) && (i2cSelectRegister(reg) != 0)) {
|
|
i2cDelay();
|
|
if(i2cSelectDevice(device | 1)) {
|
|
i2cDelay();
|
|
i2cStop(1);
|
|
return i2cGetData();
|
|
}
|
|
}
|
|
|
|
REG_I2CCNT = 0xC5;
|
|
}
|
|
|
|
return 0xff;
|
|
} |