50 lines
817 B
C
50 lines
817 B
C
#include <stdint.h>
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#include "uart.h"
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#include "gpio.h"
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void init_uart(void )
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{
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//Active waiting
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while(UART0_FR & (1<<3)){}
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//Stop UART0
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UART0_CR = 0;
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//GPIO 14 and 15 in ALT0
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GPFSEL1 &= ~((7<<12)|(7<<15));
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GPFSEL1 |= (4<<12)|(4<<15);
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GPPUD = 0;
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for(uint8_t i = 0; i < 150; i++){
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asm volatile ("nop");
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}
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GPPUDCLK0 = (1<<14)|(1<<5);
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for(uint8_t i = 0; i < 150; i++){
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asm volatile ("nop");
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}
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//CLR INTR
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GPPUDCLK0 = 0;
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// Setup for 115200bps @3Mhz
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// 3000000 /(115200 * 16) = 1.627
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// 0.627 * 64 + 0.5 = 40.628 -> 40
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UART0_IBRD = 1; //int part
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UART0_FBRD = 40; //fract part
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UART0_LCRH = 0b11 <<5; //format 8n1
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UART0_CR = 0x301; //Active Tx, Rx & FIFO
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}
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void putc(char c){
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//FIFO Full?
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while(UART0_FR & (1<<5)){}
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UART0_DR = c;
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}
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void puts(const char *s){
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while(*s)
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putc(*s++);
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}
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