/* set controller refresh rate (should be monitor refresh rate) */
void
nvstusb_set_rate(
struct nvstusb_context *ctx,
float rate
) {
assert(ctx != 0);
assert(ctx->device != 0);
assert(rate > 60);
/* send some magic data to device, this function is mainly black magic */
/* some timing voodoo */
int32_t frameTime = (1000000.0/rate); /* 8.33333 ms if 120 Hz */
int32_t activeTime = 2080; /* 2.08000 ms time each eye is on*/
int32_t w = NVSTUSB_T2_COUNT(4568.50); /* 4.56800 ms */
int32_t x = NVSTUSB_T0_COUNT(4774.25); /* 4.77425 ms */
int32_t y = NVSTUSB_T0_COUNT(activeTime);
int32_t z = NVSTUSB_T2_COUNT(frameTime);
uint8_t cmdTimings[] = {
NVSTUSB_CMD_WRITE, /* write data */
0x00, /* to address 0x2007 (0x2007+0x00) = ?? */
0x18, 0x00, /* 24 bytes follow */
/* original: e1 29 ff ff (-54815; -55835) */
w, w>>8, w>>16, w>>24, /* 2007: ?? some timer 2 counter, 1020 is subtracted from this
* loaded at startup with:
* 0x44 0xEC 0xFE 0xFF (-70588(-1020)) */
/* original: 68 b5 ff ff (-19096), 4.774 ms */
x, x>>8, x>>16, x>>24, /* 200b: ?? counter saved at long at address 0x4f
* increased at timer 0 interrupt if bit 20h.1
* is cleared, on overflow
* to 0 the code at 0x03c8 is executed.
* timer 0 will be started with this value
* by timer2 */
/* original: 81 df ff ff (-8319), 2.08 ms */
y, y>>8, y>>16, y>>24, /* 200f: ?? counter saved at long at address 0x4f, 784 is added to this
* if PD1 is set, delay until turning eye off? */
/* wave forms to send via IR: */
0x30, /* 2013: 110000 PD1=0, PD2=0: left eye off */
0x28, /* 2014: 101000 PD1=1, PD2=0: left eye on */
0x24, /* 2015: 100100 PD1=0, PD2=1: right eye off */
0x22, /* 2016: 100010 PD1=1, PD2=1: right eye on */
/* ?? used when frameState is != 2, for toggling bits in Port B,
* values seem to have no influence on the glasses or infrared signals */
0x0a, /* 2017: 1010 */
0x08, /* 2018: 1000 */
0x05, /* 2019: 0101 */
0x04, /* 201a: 0100 */
z, z>>8, z>>16, z>>24 /* 201b: timer 2 reload value */
};
nvstusb_usb_write_bulk(ctx->device, 2, cmdTimings, sizeof(cmdTimings));
uint8_t cmd0x1c[] = {
NVSTUSB_CMD_WRITE, /* write data */
0x1c, /* to address 0x2023 (0x2007+0x1c) = ?? */
0x02, 0x00, /* 2 bytes follow */
0x02, 0x00 /* ?? seems to be the start value of some
counter. runs up to 6, some things happen
when it is lower, that will stop if when
it reaches 6. could be the index to 6 byte values
at 0x17ce that are loaded into TH0*/
};
nvstusb_usb_write_bulk(ctx->device, 2, cmd0x1c, sizeof(cmd0x1c));
/* wait at most 2 seconds before going into idle */
uint16_t timeout = rate * 4;
uint8_t cmdTimeout[] = {
NVSTUSB_CMD_WRITE, /* write data */
0x1e, /* to address 0x2025 (0x2007+0x1e) = timeout */
0x02, 0x00, /* 2 bytes follow */
timeout, timeout>>8 /* idle timeout (number of frames) */
};
nvstusb_usb_write_bulk(ctx->device, 2, cmdTimeout, sizeof(cmdTimeout));
uint8_t cmd0x1b[] = {
NVSTUSB_CMD_WRITE, /* write data */
0x1b, /* to address 0x2022 (0x2007+0x1b) = ?? */
0x01, 0x00, /* 1 byte follows */
0x07 /* ?? compared with byte at 0x29 in TD_Poll()
bit 0-1: index to a table of 4 bytes at 0x17d4 (0x00,0x08,0x04,0x0C),
PB1 is set in TD_Poll() if this index is 0, cleared otherwise
bit 2: set bool21_4, start timer 1, enable ext. int. 5
bit 3: PC1 is set to the inverted value of this bit in TD_Poll()
bit 4-5: index to a table of 4 bytes at 0x2a
bit 6: restart t0 on some conditions in TD_Poll()
*/
};
nvstusb_usb_write_bulk(ctx->device, 2, cmd0x1b, sizeof(cmd0x1b));
ctx->rate = rate;
}
/* perform swap and toggle eyes hopefully with correct timing */
void
nvstusb_swap_eye(
struct nvstusb_context *ctx,
enum nvstusb_eye eye, int32_t rate
) {
assert(ctx != 0);
assert(ctx->device != 0);
assert(eye == nvstusb_left || eye == nvstusb_right || eye == nvstusb_quad);
uint32_t r = NVSTUSB_T0_COUNT(rate);
uint8_t buf[8] =
{
NVSTUSB_CMD_SET_EYE,
eye==nvstusb_right ? 0xff:0xfe,
0x00, 0x00,
r, r>>8, r>>16, r>>24
};
nvstusb_usb_write_bulk(ctx->device, 1, buf, 8);
}
/* get key status from controller */
void
nvstusb_get_keys(
struct nvstusb_context *ctx,
struct nvstusb_keys *keys
) {
assert(ctx != 0);
assert(keys != 0);
uint8_t cmd1[] = {
NVSTUSB_CMD_READ | /* read and clear data */
NVSTUSB_CMD_CLEAR,
0x18, /* from address 0x201F (0x2007+0x18) = status? */
0x03, 0x00 /* read/clear 3 bytes */
};
nvstusb_usb_write_bulk(ctx->device, 2, cmd1, sizeof(cmd1));
uint8_t readBuf[4+cmd1[2]];
nvstusb_usb_read_bulk(ctx->device, 4, readBuf, sizeof(readBuf));
/* readBuf[0] contains the offset (0x18),
* readBuf[1] contains the number of read bytes (0x03),
* readBuf[2] (msb) and readBuf[3] (lsb) of the bytes sent (sizeof(cmd1))
* readBuf[4] and following contain the requested data */
/* from address 0x201F:
* signed 8 bit integer: amount the wheel was turned without the button pressed
*/
keys->deltaWheel = readBuf[4];
/* from address 0x2020:
* signed 8 bit integer: amount the wheel was turned with the button pressed
*/
keys->pressedDeltaWheel = readBuf[5];
/* from address 0x2021:
* bit 0: front button was pressed since last time (presumably fom pin 4 on port C)
* bit 1: logic state of pin 7 on port E
* bit 2: logic state of pin 2 on port C
*/
keys->toggled3D = readBuf[6] & 0x01;
if(keys->toggled3D) {
ctx->toggled3D = !ctx->toggled3D;
}
}