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51 lines
992 B
51 lines
992 B
// **** shitty libc ****
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void delay(int a) {
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volatile int i;
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for (i=0;i<a;i++);
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}
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void *memset(void *str, int c, unsigned int n) {
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int i;
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for (i = 0; i < n; i++) {
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*((uint8_t*)str) = c;
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++str;
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}
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return str;
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}
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void *memcpy(void *dest, const void *src, unsigned int n) {
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int i;
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// TODO: make not slow
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for (i = 0; i < n; i++) {
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((uint8_t*)dest)[i] = *(uint8_t*)src;
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++src;
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}
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return dest;
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}
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int memcmp(const void * ptr1, const void * ptr2, unsigned int num) {
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int i;
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for (i = 0; i < num; i++) {
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if ( ((uint8_t*)ptr1)[i] != ((uint8_t*)ptr2)[i] ) return -1;
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}
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return 0;
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}
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// ********************* IRQ helpers *********************
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int critical_depth = 0;
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void enter_critical_section() {
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__disable_irq();
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// this is safe because interrupts are disabled
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critical_depth += 1;
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}
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void exit_critical_section() {
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// this is safe because interrupts are disabled
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critical_depth -= 1;
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if (critical_depth == 0) {
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__enable_irq();
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}
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}
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