rpi4-osdev/part12-wgt/wgt.c

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#include "wgt.h"
block abuf; /* pointer to the active screen */
block fbuf; /* pointer to the hardware framebuffer */
unsigned int currentcolor;
short tx = 0,ty = 0,bx = 319,by = 199; /* clipping variables */
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int curx = 0;
int cury = 0;
wgt_sys WGT_SYS;
// ######## HELPER FUNCTIONS ########
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void *memset(void *dest, unsigned int val, unsigned len)
{
unsigned int *ptr = dest;
while (len-- > 0)
*ptr++ = val;
return dest;
}
void *memcpy(void *dest, const void *src, unsigned len)
{
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unsigned int *d = dest;
const unsigned int *s = src;
while (len--)
*d++ = *s++;
return dest;
}
void *memcpy_xray(void *dest, const void *src, unsigned len)
{
unsigned int *d = dest;
const unsigned int *s = src;
while (len--) {
if (*s != 0) {
*d++ = *s++;
} else {
d++;
s++;
}
}
return dest;
}
void *memcpy_char(void *dest, const void *src, unsigned len)
{
unsigned char *d = dest;
const unsigned char *s = src;
while (len--)
*d++ = *s++;
return dest;
}
int memcmp(char *str1, char *str2, unsigned count)
{
char *s1 = str1;
char *s2 = str2;
while (count-- > 0)
{
if (*s1++ != *s2++)
return s1[-1] < s2[-1] ? -1 : 1;
}
return 0;
}
int abs(int i)
{
return i < 0 ? -i : i;
}
int strlen(const char *str)
{
const char *s;
for (s = str; *s; ++s);
return (s - str);
}
// ######## WGT FUNCTIONS ########
void wcls (unsigned int col)
{
memset (abuf, col, WGT_SYS.xres * WGT_SYS.yres);
}
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void debugstr(char *str) {
if (curx + (strlen(str) * 8) >= 320) {
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curx = 0; cury += 8;
}
if (cury + 8 >= 200) {
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cury = 0;
}
wtextcolor(vgapal[15]);
wouttextxy (curx, cury, NULL, str);
curx += (strlen(str) * 8);
}
void debugcrlf(void) {
curx = 0; cury += 8;
}
void debugreset(void) {
curx = 0; cury = 0;
}
void debugch(unsigned char b) {
unsigned int n;
int c;
for(c=4;c>=0;c-=4) {
n=(b>>c)&0xF;
n+=n>9?0x37:0x30;
debugstr((char *)&n);
}
debugstr(" ");
}
void debughex(unsigned int d) {
unsigned int n;
int c;
for(c=28;c>=0;c-=4) {
n=(d>>c)&0xF;
n+=n>9?0x37:0x30;
debugstr((char *)&n);
}
debugstr(" ");
}
void delay(unsigned int n)
{
register unsigned long f, t, r;
// Get the current counter frequency
asm volatile ("mrs %0, cntfrq_el0" : "=r"(f));
// Read the current counter
asm volatile ("mrs %0, cntpct_el0" : "=r"(t));
// Calculate expire value for counter
t+=(f/1000)*n;
do{asm volatile ("mrs %0, cntpct_el0" : "=r"(r));}while(r<t);
}