mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-05 19:51:45 +00:00
33 lines
704 B
C
33 lines
704 B
C
|
#include "uart.h"
|
||
|
|
||
|
volatile void *g_uart_registers = NULL;
|
||
|
|
||
|
void set_uart_address(void *uart_base) {
|
||
|
g_uart_registers = uart_base;
|
||
|
}
|
||
|
|
||
|
inline void *get_uart_address(void) {
|
||
|
return g_uart_registers;
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
}
|