55 lines
1.2 KiB
C
55 lines
1.2 KiB
C
// a simple test program
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#include <stdint.h>
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uint32_t strlen(const char* str) {
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if(!str)
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return 0;
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const char* c = str;
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while(*c++)
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;
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return c - str;
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}
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#define UART_BASE 0x10000000
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#define UART_DATA *(volatile uint32_t*)UART_BASE
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#define UART_STATUS UART_DATA
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void putc(char c) {
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UART_DATA = (uint32_t)c;
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}
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__attribute__((noinline)) void puts(const char* str) {
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const uint32_t length = strlen(str);
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for(uint32_t i = 0; i < length; ++i)
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putc(str[i]);
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}
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static uint32_t value = 0;
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static uint16_t shortvalue = 0;
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static uint8_t bytevalue = 0;
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#define COUNTER_TEST(var, max) \
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for(int i = 0; i < max; ++i) { \
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puts(#var " is (before modification): "); \
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putc("0123456789"[var]); \
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putc('\n'); \
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\
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var = i; \
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puts(#var " is (after modification): "); \
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putc("0123456789"[var]); \
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putc('\n'); \
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}
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void main() {
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puts("hello world I guess\n");
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#if 1
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COUNTER_TEST(value, 9);
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COUNTER_TEST(shortvalue, 9);
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COUNTER_TEST(bytevalue, 9);
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#endif
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// loop forever
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for(;;);
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}
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