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// Uart and r_uart functions for ar100
//
// Copyright (C) 2020-2021 Elias Bakken <elias@iagent.no>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include "serial.h"
#include "util.h"
#include "internal.h"
#include "gpio.h"
void r_uart_init(void){
// Setup Pins PL2, PL3 as UART IO
gpio_mux_setup(2, PIO_ALT1);
gpio_mux_setup(3, PIO_ALT1);
// Enable clock and assert reset
clear_bit(APB0_CLK_GATING_REG, 4);
set_bit(APB0_SOFT_RST_REG, 4);
set_bit(APB0_CLK_GATING_REG, 4);
// Setup baud rate
set_bit(R_UART_LCR, 7); // Enable setting DLH, DLL
write_reg(R_UART_DLH, 0x0);
write_reg(R_UART_DLL, 0xD); // 1 500 000
write_reg(R_UART_LCR, 0x3); // 8 bit data length
write_reg(R_UART_FCR, 0<<0); // Disable fifo
r_uart_getc(); // flush input
write_reg(R_UART_FCR, 1<<0); // Enable fifo
}
char r_uart_getc(void){
char c = (char) read_reg(R_UART_RBR);
return c;
}
uint32_t r_uart_fifo_rcv(void){
return read_reg(R_UART_RFL);
}
void r_uart_putc(char c){
while(!(read_reg(R_UART_LSR) & 1<<5))
;
write_reg(R_UART_THR, c);
}
void r_uart_puts(char *s){
while(*s){
r_uart_putc(*s++);
}
}
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