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64 lines
1.3 KiB
C
64 lines
1.3 KiB
C
//
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// Authors: Wolfgang Spraul <wolfgang@sharism.cc>
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version
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// 3 of the License, or (at your option) any later version.
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//
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#include "jz4740.h"
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#include "serial.h"
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void serial_putc(char c)
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{
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volatile u8* uart_lsr = (volatile u8*)(UART_BASE + OFF_LSR);
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volatile u8* uart_tdr = (volatile u8*)(UART_BASE + OFF_TDR);
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if (c == '\n') serial_putc ('\r');
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/* Wait for fifo to shift out some bytes */
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while ( !((*uart_lsr & (UART_LSR_TDRQ | UART_LSR_TEMT)) == 0x60) );
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*uart_tdr = (u8) c;
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}
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void serial_puts(const char *s)
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{
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while (*s) serial_putc(*s++);
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}
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void serial_put_hex(unsigned int v)
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{
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unsigned char c[12];
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char i;
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for(i = 0; i < 8;i++)
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{
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c[i] = (v >> ((7 - i) * 4)) & 0xf;
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if(c[i] < 10)
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c[i] += 0x30;
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else
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c[i] += (0x41 - 10);
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}
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c[8] = '\n';
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c[9] = 0;
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serial_puts(c);
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}
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int serial_getc()
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{
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volatile u8* uart_rdr = (volatile u8*)(UART_BASE + OFF_RDR);
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while (!serial_tstc());
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return *uart_rdr;
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}
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int serial_tstc()
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{
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volatile u8* uart_lsr = (volatile u8*)(UART_BASE + OFF_LSR);
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if (*uart_lsr & UART_LSR_DR) {
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/* Data in rfifo */
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return 1;
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}
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return 0;
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}
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