Attached is a zip file with a simple demo I wrote (based on the combined template example from devkitpro) that reads the X acceleration on the arm7, then passes it to the arm9 via IPC to be displayed on the screen. It does not use NH/AR. My goal is to put the code listed below (from the attached arm7 source) into a NH/AR code that gets run every vblank.
Code:
// DS Motion Code
// Need to do the read in two parts
// First part sends the command to load acceleration value onto bus
// Second part reads the acceleration from the bus
static unsigned char read_state = 0;
if(read_state == 0) // first part of read - send command to read X
{
read_state = ((volatile unsigned char*)0x0A000000)[2]; // send the command to read X
read_state = 1; // update read state to the next step
}
else // second part of read - get X acceleration
{
IPC->aux = ((volatile unsigned char*)0x0A000000)[0]; // read acceleration and send it to arm9
/*
Instead of loading X acceleration into IPC-> aux, it could be used to activate
Left and Right buttons like this:
if(Xaccel < (128-tilt_thresh) ) "Activate Right button"
if(Xaccel > (128+tilt_thresh) ) "Activate Left button"
tilt_thresh is a threshold that defines the "dead zone" where neither Left or Right
are pressed. Xaccel is equal or close to 128 when device is flat. It increases
when tilted left, and decreases when tilted right
*/
read_state = 0; // reset the read state
}
// Need to do the read in two parts
// First part sends the command to load acceleration value onto bus
// Second part reads the acceleration from the bus
static unsigned char read_state = 0;
if(read_state == 0) // first part of read - send command to read X
{
read_state = ((volatile unsigned char*)0x0A000000)[2]; // send the command to read X
read_state = 1; // update read state to the next step
}
else // second part of read - get X acceleration
{
IPC->aux = ((volatile unsigned char*)0x0A000000)[0]; // read acceleration and send it to arm9
/*
Instead of loading X acceleration into IPC-> aux, it could be used to activate
Left and Right buttons like this:
if(Xaccel < (128-tilt_thresh) ) "Activate Right button"
if(Xaccel > (128+tilt_thresh) ) "Activate Left button"
tilt_thresh is a threshold that defines the "dead zone" where neither Left or Right
are pressed. Xaccel is equal or close to 128 when device is flat. It increases
when tilted left, and decreases when tilted right
*/
read_state = 0; // reset the read state
}
I've never done any AR code writing, so I'm not sure how to get it to execute this code.
| Attachments: |
File comment: DS Motion arm7 demo
arm7_DSMotion.zip [6.29 KiB]
Downloaded 793 times |
