raspberry3_bare/hello.c

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#include "fb.h"
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#include "mbox.h"
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#include "uart.h"
#include "utils.h"
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struct fbst fb;
int kernelmain(void)
{
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init_uart();
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if (init_fb(&fb) == 0){
puts("Fail to init framebuffer");
}
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mbox[0] = 8 * 4;
mbox[1] = MBOX_REQUEST;
mbox[2] = MBOX_TAG_GETVCOREMEM;
mbox[3] = 8;
mbox[4] = 0;
mbox[5] = 0;
mbox[6] = 0;
mbox[7] = MBOX_TAG_LAST;
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if (mbox_call(MBOX_CH_PROP, mbox)) {
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puts("videocore start at 0x");
printhex(mbox[5]);
puts(" - ");
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int mem = mbox[6] / 1024 / 1024;
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printdec(mem);
puts(" Mo\n");
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} else {
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puts("Error getting videocore mem\n");
}
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unsigned char *ptr=fb.fbp;
for(int y=0; y<fb.height; y++) {
for(int x=0; x<fb.width; x++) {
if(y%60==0)
*((unsigned int*)ptr)=0x00FF0000;
else if (y%40==0)
*((unsigned int*)ptr)=0x0000FF00;
else if (y%20==0)
*((unsigned int*)ptr)=0x000000FF;
else
*((unsigned int*)ptr)=0x00000000;
ptr+=4;
}
}
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return 0;
}