Atmosphere/exosphere/uart.c
2018-02-22 17:50:37 -08:00

36 lines
827 B
C

#include "uart.h"
void uart_initialize(uint16_t divider) {
/* Setup UART in 16450 mode. We assume the relevant UART clock has been enabled. */
/* Disable FIFO */
UART_IIR_FCR_0 = 0x00;
/* Set DLAB */
UART_LCR_0 = 0x80;
UART_THR_DLAB_0_0 = (uint8_t)divider;
UART_IER_DLAB_0_0 = (uint8_t)(divider >> 8);
/* 8N1 mode */
UART_LCR_0 = 0x03;
}
void uart_transmit_char(char ch) {
/* Wait for THR to be empty */
while (!(UART_LSR_0 & 0x20)) {}
UART_THR_DLAB_0_0 = ch;
}
void uart_transmit_str(const char *str) {
while (*str) {
uart_transmit_char(*str++);
}
}
void uart_transmit_hex(uint32_t value) {
for (unsigned int i = 0; i < 8; i++) {
uint32_t nibble = (value >> (28 - i * 4)) & 0xF;
uart_transmit_char("0123456789ABCDEF"[nibble]);
}
}