21 lines
588 B
C
21 lines
588 B
C
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#define PMC_BASE 0x7000e400
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#define APB_MISC_BASE 0x70000000
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void _start() {
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*(volatile unsigned int *)(PMC_BASE + 0x1b4) = 0x0; // Clear PWR_DET_LATCH
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*(volatile unsigned int *)(PMC_BASE + 0x1b8) =
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0xFFFFFFFF; // Force High Voltage Mode
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*(volatile unsigned int *)(APB_MISC_BASE + 0x8BC) =
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0x00000000; // UART1_TX Pad Control
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*(volatile unsigned int *)(PMC_BASE + 0x50) = 0x50575221; // "PWR!"
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volatile unsigned int *uart = (unsigned int *)0x70006000;
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while (1) {
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*uart = 0x55; // 01010101 pattern
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for (volatile int i = 0; i < 1000; i++)
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;
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}
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}
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