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//! Serial Write Operations
const common = @import("../../../common/common.zig");
const asm_io = @import("../../asm/io/io.zig");
const serial_constants = common.constants.serial;
const ports = serial_constants.ports;
const registers = serial_constants.registers;
var current_port: u16 = ports.default_port;
pub fn set_port(port: u16) void {
current_port = port;
}
pub fn is_transmit_empty(port: u16) bool {
return (asm_io.read_byte(port + registers.line_status_register) & registers.line_status_transmit_empty) != 0;
}
pub fn write_character(port: u16, character: u8) void {
while (!is_transmit_empty(port)) {
asm_io.io_wait();
}
asm_io.write_byte(port + registers.data_register, character);
}
pub fn write_string(port: u16, string: []const u8) void {
for (string) |character| {
if (character == '\n') {
write_character(port, '\r');
}
write_character(port, character);
}
}
pub fn print(string: []const u8) void {
write_string(current_port, string);
}
pub fn print_character(character: u8) void {
if (character == '\n') {
write_character(current_port, '\r');
}
write_character(current_port, character);
}
pub fn print_hex(value: u64) void {
const hex_chars = "0123456789ABCDEF";
var buffer: [18]u8 = undefined;
buffer[0] = '0';
buffer[1] = 'x';
var temp_value = value;
var index: usize = 17;
while (index > 1) : (index -= 1) {
buffer[index] = hex_chars[@truncate(temp_value & 0xF)];
temp_value >>= 4;
}
print(&buffer);
}
pub fn print_decimal(value: u64) void {
if (value == 0) {
print_character('0');
return;
}
var buffer: [20]u8 = undefined;
var temp_value = value;
var index: usize = 20;
while (temp_value > 0) {
index -= 1;
buffer[index] = @truncate((temp_value % 10) + '0');
temp_value /= 10;
}
print(buffer[index..]);
}
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