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51 lines
975 B
51 lines
975 B
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#define UARTBASE 0xE000C000 |
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#define RBR 0x00 |
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#define THR 0x00 |
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#define DLL 0x00 |
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#define DLM 0x04 |
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#define IER 0x04 |
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#define IIR 0x08 |
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#define FCR 0x08 |
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#define LCR 0x0c |
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#define LSR 0x14 |
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#define SCR 0x1c |
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#define ACR 0x20 |
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#define FDR 0x28 |
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#define TER 0x30 |
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#define REG(x) (((volatile unsigned char *)UARTBASE)[x]) |
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#define U0THRE ((REG(LSR) & (1<<5))) /* UART0 transmitter holding register is empty */ |
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#define PINSEL0 (*((volatile unsigned char *) 0xE002C000)) |
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void init_uart(void) |
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{ |
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REG(FDR) = 0x10; /* DivAddVal = 0, MulVal = 1 */ |
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REG(LCR) = 0x80; |
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REG(DLM) = 0x00; |
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REG(DLL) = 0x08; /* 14745600 / (16*115200) */ |
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REG(LCR) = 0x13; |
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REG(FCR) = 0x07; |
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PINSEL0 = 0x00000005; /* P0.0 and P0.1 assigned to UART */ |
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} |
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void putch(char c) { |
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while (!U0THRE); |
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REG(THR) = c; |
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} |
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void putstr(char *s) { |
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while (*s) putch(*s++); |
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} |
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int main(void) { |
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init_uart(); |
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putstr("Your entire life has been a mathematical error... a mathematical error I'm about to correct!\n"); |
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return 0; |
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}
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