int main(int ac, char** av)
{
#if 1
{
fixed_t fu = float_to_fixed(1.2);
fixed_t bar = float_to_fixed(2.4);
fixed_t baz = fixed_add(fu, bar);
printf("%f + ", fixed_to_float(fu));
printf("%f = ", fixed_to_float(bar));
printf("%f\n", fixed_to_float(baz));
}
{
fixed_t fu = float_to_fixed(1.5);
fixed_t bar = int_to_fixed(2);
fixed_t baz = fixed_mul(fu, bar);
printf("%f * ", fixed_to_float(fu));
printf("%f = ", fixed_to_float(bar));
printf("%f\n", fixed_to_float(baz));
}
{
fixed_t fu = int_to_fixed(1);
fixed_t bar = int_to_fixed(2);
fixed_t baz = fixed_div(fu, bar);
printf("%f / ", fixed_to_float(fu));
printf("%f = ", fixed_to_float(bar));
printf("%f\n", fixed_to_float(baz));
}
{
fixed_t fu = int_to_fixed(-1);
fixed_t bar = int_to_fixed(2);
fixed_t baz = fixed_div(fu, bar);
printf("%f / ", fixed_to_float(fu));
printf("%f = ", fixed_to_float(bar));
printf("%f\n", fixed_to_float(baz));
}
#endif
#if 0
{
fixed_t alpha = float_to_fixed(0.0);
fixed_t step = float_to_fixed(0.01);
for (; alpha < FIXED_TWO_PI; alpha = fixed_add(alpha, step))
{
printf("%f ", fixed_to_float(alpha));
printf("%f\n", fabsf(sinf(fixed_to_float(alpha)) - fixed_to_float(fixed_sin(alpha))));
}
}
#endif
return 0;
}
void test_fixed_divide(void)
{
/* Negative */
a = fixed_make(-2023.621F);
b = fixed_make(10.0F);
result = fixed_div(a, b);
TEST_ASSERT_EQUAL_FLOAT(fixed_make(-202.3621F), result);
/* Positive */
a = fixed_make(2023.621F);
b = fixed_make(10.0F);
result = fixed_div(a, b);
TEST_ASSERT_EQUAL_FLOAT(fixed_make(202.3621F), result);
}
void temp_handler(void) {
temp_samples[sample++] = make_fixed(raw_temp);
if (sample == N_SAMPLES) {
fixed_t t = make_fixed(0);
for (uint8_t i = 0; i < N_SAMPLES; i++) {
t = fixed_add(t, temp_samples[i]);
}
temp = fixed_round(fixed_div(fixed_div(t, N_SAMPLES), 4));
set_number(0, temp, relay_on);
sample = 0;
}
}
void mat44_perspective(mat44 *m, fixed fov, fixed aspect, fixed near_z, fixed far_z) {
fixed _fov = fixed_div(fixed_mul(FIXED_PI, fov), int_to_fixed(180));
fixed _f = fixed_div(FIXED_ONE, fixed_tan(fixed_mul(_fov, double_to_fixed(0.5))));
fixed nf = fixed_div((far_z + near_z), (near_z - far_z));
fixed nfr = fixed_div(fixed_mul(fixed_mul(int_to_fixed(2), far_z), near_z), (near_z - far_z));
mat44_set(m,
fixed_div(_f, aspect), 0 , 0 , 0 ,
0 , _f, 0 , 0 ,
0 , 0 , nf , nfr,
0 , 0 , FIXED_NEGONE, 0);
}
void Scan_Samples(void){
fixed ybox[7]; // array box car derivative
s16 bin; // index into peak height array
fixed dt, tau, *yp0, *yp1, y, y_i;
fixed threshold; // trigger level for leading edge
fixed deriv;
fixed alpha, beta, gamma, peak;
s16 i;
configurations *cp = &configuration;
ADC_Stop();
tail = head = Get_Scan_Pos(); // get current absolute position in adc buffer
/*
if(cp->sig_filter){
// Set up Butterworth low pass filter
dt = FIXED_HALF; // sample time 0.5 uS
tau = fixed_from_int(cp->sig_filter); // filter time in uS
alpha = fixed_div(dt, tau + dt);
}
*/
ADC_Start();
while(TRUE){
if(tail == head){
head = Get_Scan_Pos();
// recalculate filter elements in case changed
/*
if(cp->sig_filter){
// Set up Butterworth low pass filter in case of changes
dt = FIXED_HALF; // sample time 0.5 uS
tau = fixed_from_int(cp->sig_filter); // filter time in uS
alpha = fixed_div(dt, tau + dt);
}
*/
}
if(tail == head)
continue;
// track live time
if(samp_cntr++ >= SAMP_PER_MS){
live_time++;
samp_cntr = 0;
}
// get new value, adjust for zero and inversion at same time
y = fixed_from_int(zero - scan_buffer[tail++]);
if(tail >= SCAN_BUFFER_SZ){
tail = 0;
}
// filter signal if needed
/*
if(cp->sig_filter){
// Butterworth low pass filter
y = *yp0 + fixed_mul(alpha, (y - *yp0));
}
*/
// shift the boxcar window and find derivative
yp0 =&ybox[0];
yp1 = &ybox[1];
for(i = 6; i > 0; i--){ // last box slot gets new y value
*yp0++ = *yp1++;
}
*yp0 = y; // place latest sample in end of boxcar
// compute the derivative
deriv = 0;
yp0 =&ybox[0];
deriv -= *yp0++;
deriv -= *yp0++;
alpha = *yp0;
deriv -= *yp0++;
beta = *yp0++;
gamma = *yp0;
deriv += *yp0++;
deriv += *yp0++;
deriv += *yp0++;
// process depending on state
switch(scan_state){
case RESTART:
scan_state = LEADING;
//cp->scope_valid = FALSE;
break;
case LEADING:
if(cp->sig_type == PULSE_POS && deriv > cp->sig_dvdt_lim){
scan_state = PEAK;
break;
}
if(cp->sig_type == PULSE_NEG && deriv < cp->sig_dvdt_lim){
scan_state = PEAK;
break;
}
// if no pulse then check the zero
avg_zero = (avg_zero * 20 + y)/21;
break;
case PEAK:
// reverse derivative indicates peak
if(cp->sig_type == PULSE_POS && deriv < 0){
scan_state = TAIL;
}
if(cp->sig_type == PULSE_NEG && deriv > 0){
scan_state = TAIL;
}
if(scan_state == TAIL){
// handle gaussian approximation if enabled
if(cp->sig_gaussian){
// p = ((a - g)/(a -2b + g))/2 = position of peak
peak = (fixed_div((alpha - gamma),(alpha - (2 * beta) + gamma))) / 2;
// y(p) = b - ((a - g) * p)/4 = peak value
peak = beta - (fixed_mul((alpha - gamma), peak) / 4);
} else {
peak = (alpha + beta + gamma) / 3;
}
if(cp->sig_type == PULSE_NEG){
peak = -peak;
}
// peak now always positive
if( peak > cp->sig_lo_lim && peak < cp->sig_hi_lim){
bin = fixed_to_int(peak);
pulse_height[bin]++; // increment count in spectrum array
cur_cnt++;
// handle rate meter beeping
if(cp->rate_beep && !alarm_on){
Beep(BEEP_500Hz, 10);
}
}
}
break;
case TAIL:
// find where curve turns back to baseline
if(cp->sig_type == PULSE_POS && deriv >= 0){
scan_state = LEADING;
}
if(cp->sig_type == PULSE_NEG && deriv <= 0){
scan_state = LEADING;
}
break;
} // switch(scan_state)
} // while ring buffer not empty
}
void
image_downsize_gd_fixed_point(image *im)
{
int x, y;
fixed_t sy1, sy2, sx1, sx2;
int dstX = 0, dstY = 0, srcX = 0, srcY = 0;
fixed_t width_scale, height_scale;
int dstW = im->target_width;
int dstH = im->target_height;
int srcW = im->width;
int srcH = im->height;
if (im->height_padding) {
dstY = im->height_padding;
dstH = im->height_inner;
}
if (im->width_padding) {
dstX = im->width_padding;
dstW = im->width_inner;
}
width_scale = fixed_div(int_to_fixed(srcW), int_to_fixed(dstW));
height_scale = fixed_div(int_to_fixed(srcH), int_to_fixed(dstH));
for (y = dstY; (y < dstY + dstH); y++) {
sy1 = fixed_mul(int_to_fixed(y - dstY), height_scale);
sy2 = fixed_mul(int_to_fixed((y + 1) - dstY), height_scale);
for (x = dstX; (x < dstX + dstW); x++) {
fixed_t sx, sy;
fixed_t spixels = 0;
fixed_t red = 0, green = 0, blue = 0, alpha = 0;
if (!im->has_alpha)
alpha = FIXED_255;
sx1 = fixed_mul(int_to_fixed(x - dstX), width_scale);
sx2 = fixed_mul(int_to_fixed((x + 1) - dstX), width_scale);
sy = sy1;
/*
DEBUG_TRACE("sx1 %f, sx2 %f, sy1 %f, sy2 %f\n",
fixed_to_float(sx1), fixed_to_float(sx2), fixed_to_float(sy1), fixed_to_float(sy2));
*/
do {
fixed_t yportion;
//DEBUG_TRACE(" yportion(sy %f, sy1 %f, sy2 %f) = ", fixed_to_float(sy), fixed_to_float(sy1), fixed_to_float(sy2));
if (fixed_floor(sy) == fixed_floor(sy1)) {
yportion = FIXED_1 - (sy - fixed_floor(sy));
if (yportion > sy2 - sy1) {
yportion = sy2 - sy1;
}
sy = fixed_floor(sy);
}
else if (sy == fixed_floor(sy2)) {
yportion = sy2 - fixed_floor(sy2);
}
else {
yportion = FIXED_1;
}
//DEBUG_TRACE("%f\n", fixed_to_float(yportion));
sx = sx1;
do {
fixed_t xportion;
fixed_t pcontribution;
pix p;
//DEBUG_TRACE(" xportion(sx %f, sx1 %f, sx2 %f) = ", fixed_to_float(sx), fixed_to_float(sx1), fixed_to_float(sx2));
if (fixed_floor(sx) == fixed_floor(sx1)) {
xportion = FIXED_1 - (sx - fixed_floor(sx));
if (xportion > sx2 - sx1) {
xportion = sx2 - sx1;
}
sx = fixed_floor(sx);
}
else if (sx == fixed_floor(sx2)) {
xportion = sx2 - fixed_floor(sx2);
}
else {
xportion = FIXED_1;
}
//DEBUG_TRACE("%f\n", fixed_to_float(xportion));
pcontribution = fixed_mul(xportion, yportion);
p = get_pix(im, fixed_to_int(sx + srcX), fixed_to_int(sy + srcY));
/*
DEBUG_TRACE(" merging with pix %d, %d: src %x (%d %d %d %d), pcontribution %f\n",
fixed_to_int(sx + srcX), fixed_to_int(sy + srcY),
p, COL_RED(p), COL_GREEN(p), COL_BLUE(p), COL_ALPHA(p), fixed_to_float(pcontribution));
*/
red += fixed_mul(int_to_fixed(COL_RED(p)), pcontribution);
green += fixed_mul(int_to_fixed(COL_GREEN(p)), pcontribution);
blue += fixed_mul(int_to_fixed(COL_BLUE(p)), pcontribution);
if (im->has_alpha)
alpha += fixed_mul(int_to_fixed(COL_ALPHA(p)), pcontribution);
spixels += pcontribution;
sx += FIXED_1;
} while (sx < sx2);
sy += FIXED_1;
} while (sy < sy2);
// If rgba get too large for the fixed-point representation, fallback to the floating point routine
// This should only happen with very large images
if (red < 0 || green < 0 || blue < 0 || alpha < 0) {
warn("fixed-point overflow: %d %d %d %d\n", red, green, blue, alpha);
return image_downsize_gd(im);
}
if (spixels != 0) {
/*
DEBUG_TRACE(" rgba (%f %f %f %f) spixels %f\n",
fixed_to_float(red), fixed_to_float(green), fixed_to_float(blue), fixed_to_float(alpha), fixed_to_float(spixels));
*/
spixels = fixed_div(FIXED_1, spixels);
red = fixed_mul(red, spixels);
green = fixed_mul(green, spixels);
blue = fixed_mul(blue, spixels);
if (im->has_alpha)
alpha = fixed_mul(alpha, spixels);
}
/* Clamping to allow for rounding errors above */
if (red > FIXED_255) red = FIXED_255;
if (green > FIXED_255) green = FIXED_255;
if (blue > FIXED_255) blue = FIXED_255;
if (im->has_alpha && alpha > FIXED_255) alpha = FIXED_255;
/*
DEBUG_TRACE(" -> %d, %d %x (%d %d %d %d)\n",
x, y, COL_FULL(fixed_to_int(red), fixed_to_int(green), fixed_to_int(blue), fixed_to_int(alpha)),
fixed_to_int(red), fixed_to_int(green), fixed_to_int(blue), fixed_to_int(alpha));
*/
if (im->orientation != ORIENTATION_NORMAL) {
int ox, oy; // new destination pixel coordinates after rotating
image_get_rotated_coords(im, x, y, &ox, &oy);
if (im->orientation >= 5) {
// 90 and 270 rotations, width/height are swapped so we have to use alternate put_pix method
put_pix_rotated(
im, ox, oy, im->target_height,
COL_FULL(fixed_to_int(red), fixed_to_int(green), fixed_to_int(blue), fixed_to_int(alpha))
);
}
else {
put_pix(
im, ox, oy,
COL_FULL(fixed_to_int(red), fixed_to_int(green), fixed_to_int(blue), fixed_to_int(alpha))
);
}
}
else {
put_pix(
im, x, y,
COL_FULL(fixed_to_int(red), fixed_to_int(green), fixed_to_int(blue), fixed_to_int(alpha))
);
}
}
}
}
void set_frequency(struct wave * const wave, fixed_t frequency)
{
wave->settings.frequency = frequency;
const fixed_t max_frequency = fixed_from_int(F_TASK_FAST/(2*WAVE_STEPS));
wave->state.speed_prescaler = fixed_to_int(fixed_div(max_frequency, wave->settings.frequency));
}
void decode_output_samples(sample_t *buffer, u32_t nsamples, int sample_rate) {
size_t bytes_out;
/* Some decoders can pass no samples at the start of the track. Stop
* early, otherwise we may send the track start event at the wrong
* time.
*/
if (nsamples == 0) {
return;
}
// XXXX full port from ip3k
decode_audio_lock();
if (decode_first_buffer) {
LOG_DEBUG(log_audio_decode, "first buffer sample_rate=%d", sample_rate);
upload_open();
crossfade_started = FALSE;
decode_audio->track_start_point = decode_audio->fifo.wptr;
if (decode_transition_type & TRANSITION_CROSSFADE) {
size_t crossfadeBytes;
fft_fixed interval;
if (decode_transition_type & TRANSITION_IMMEDIATE) {
size_t wanted = SAMPLES_TO_BYTES(decode_transition_period * decode_audio->track_sample_rate);
size_t used = fifo_bytes_used(&decode_audio->fifo);
if (used > wanted) {
size_t skip = used - wanted;
if (skip > decode_audio->fifo.wptr) decode_audio->fifo.wptr += decode_audio->fifo.size;
decode_audio->fifo.wptr -= skip;
}
}
/* We are being asked to do a crossfade. Find out
* if it is possible.
*/
interval = determine_transition_interval(sample_rate, decode_transition_period, &crossfadeBytes);
if (interval) {
LOG_DEBUG(log_audio_decode, "Starting CROSSFADE over %d seconds, requiring %d bytes", fixed_to_s32(interval), (unsigned int)crossfadeBytes);
/* Buffer position to stop crossfade */
crossfade_ptr = decode_audio->fifo.wptr;
/* Buffer position to start crossfade */
if (crossfadeBytes > decode_audio->fifo.wptr) decode_audio->fifo.wptr += decode_audio->fifo.size;
decode_audio->fifo.wptr -= crossfadeBytes;
/* Gain steps */
transition_gain_step = fixed_div(FIXED_ONE, fixed_mul(interval, s32_to_fixed(TRANSITION_STEPS_PER_SECOND)));
transition_gain = 0;
transition_sample_step = sample_rate / TRANSITION_STEPS_PER_SECOND;
transition_samples_in_step = 0;
crossfade_started = TRUE;
decode_audio->track_start_point = decode_audio->fifo.wptr;
}
/*
* else there aren't enough leftover samples from the
* previous track, so abort the transition.
*/
}
else if (decode_transition_type & TRANSITION_FADE_IN) {
/* The transition is a fade in. */
LOG_DEBUG(log_audio_decode, "Starting FADE_IN over %d seconds", decode_transition_period);
/* Gain steps */
transition_gain_step = fixed_div(FIXED_ONE, s32_to_fixed(decode_transition_period * TRANSITION_STEPS_PER_SECOND));
transition_gain = 0;
transition_sample_step = sample_rate / TRANSITION_STEPS_PER_SECOND;
transition_samples_in_step = 0;
}
decode_audio->track_copyright = streambuf_is_copyright();
decode_audio->track_sample_rate = sample_rate;
decode_audio->check_start_point = TRUE;
decode_first_buffer = FALSE;
}
if (upload_samples(buffer, nsamples)) {
decode_audio_unlock();
return;
}
/* If output_channels is set, copy left samples to right, or vice versa */
if (output_channels) {
unsigned int i;
if (output_channels & OUTPUT_CHANNEL_LEFT) {
for (i = 0; i < nsamples * 2; i += 2) {
buffer[i+1] = buffer[i];
}
}
else {
for (i = 0; i < nsamples * 2; i += 2) {
buffer[i] = buffer[i+1];
}
}
}
decode_apply_track_gain(buffer, nsamples);
bytes_out = SAMPLES_TO_BYTES(nsamples);
while (bytes_out) {
size_t wrap, bytes_write, bytes_remaining;
/* The size of the output write is limied by the
* space untill our fifo wraps.
*/
wrap = fifo_bytes_until_wptr_wrap(&decode_audio->fifo);
/* When crossfading limit the output write to the
* end of the transition.
*/
if (crossfade_started) {
bytes_remaining = decode_transition_bytes_remaining(crossfade_ptr);
if (bytes_remaining < wrap) {
wrap = bytes_remaining;
}
}
bytes_write = bytes_out;
if (bytes_write > wrap) {
bytes_write = wrap;
}
if (transition_gain_step) {
decode_transition_copy_bytes(buffer, bytes_write);
if ((crossfade_started && decode_audio->fifo.wptr == crossfade_ptr)
|| transition_gain >= FIXED_ONE) {
LOG_DEBUG(log_audio_decode, "Completed transition");
transition_gain_step = 0;
crossfade_started = FALSE;
}
}
else {
memcpy(decode_fifo_buf + decode_audio->fifo.wptr, buffer, bytes_write);
fifo_wptr_incby(&decode_audio->fifo, bytes_write);
}
buffer += (bytes_write / sizeof(sample_t));
bytes_out -= bytes_write;
}
decode_audio_unlock();
}
