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driver/serial: input

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This commit is contained in:
Edgaru089 2021-11-14 19:43:04 +08:00
parent a5fa453be2
commit f510da321e
2 changed files with 41 additions and 1 deletions
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28
driver/irq/pic/serial/serial.c
View File

@ -2,9 +2,19 @@
#include "serial.h"
#include "../internal.h"
#include "../../../../interrupt/interrupt.h"
#include "../../../../memory/memory.h"
#include "../pic.h"
pic_serial_Port pic_serial_COM1 = {0x3f8, false}, pic_serial_COM2 = {0x2f8, false};
pic_serial_Port pic_serial_COM1 = {0x3f8, 4, false}, pic_serial_COM2 = {0x2f8, 3, false};
SYSV_ABI void __pic_serial_IRQHandler(pic_serial_Port *port) {
while ((inb(port->port + 5) & 1)) {
uint8_t b = inb(port->port);
queue_PushByte(&port->buffer, b);
smp_Condition_NotifyAll(port->cond, 0);
}
}
bool pic_serial_Init(pic_serial_Port *port, int baudrate, int lineFlags) {
if (115200 % baudrate != 0)
@ -37,6 +47,22 @@ bool pic_serial_Init(pic_serial_Port *port, int baudrate, int lineFlags) {
return true;
}
bool pic_serial_InitInput(pic_serial_Port *port) {
// Set IRQ handler for serial input
if (port->irq) {
queue_InitBuffered(&port->buffer, kMalloc(PIC_SERIAL_DEFAULT_BUFFERSIZE), PIC_SERIAL_DEFAULT_BUFFERSIZE);
port->cond = smp_Condition_Create();
irq_pic_IRQHandler[port->irq] = __pic_serial_IRQHandler;
irq_pic_IRQHandler_Data[port->irq] = (uintptr_t)port;
irq_pic_Mask(port->irq, false);
outb(port->port + 1, 1);
return true;
} else
return false;
}
void pic_serial_Write(pic_serial_Port *port, const char *str, int n) {
if (port && port->ok) {
INTERRUPT_DISABLE;

14
driver/irq/pic/serial/serial.h
View File

@ -1,5 +1,7 @@
#pragma once
#include "../../../../util/queue.h"
#include "../../../../smp/condiction.h"
#include "stdbool.h"
#ifdef __cplusplus
@ -7,12 +9,21 @@ extern "C" {
#endif
// Default buffer size for serial input
#ifndef PIC_SERIAL_DEFAULT_BUFFERSIZE
#define PIC_SERIAL_DEFAULT_BUFFERSIZE 16
#endif
// Serial port state.
//
// Line protocol defaults to 8N1 (8 bits, no parity, one stop bit)
typedef struct {
int port; // IO Port
int irq; // IRQ, 0 for disable
bool ok; // Is the port usable?
queue_Queue buffer; // input byte buffer
smp_Condition *cond; // input wait condiction
} pic_serial_Port;
extern pic_serial_Port pic_serial_COM1, pic_serial_COM2;
@ -22,6 +33,9 @@ extern pic_serial_Port pic_serial_COM1, pic_serial_COM2;
// TODO lineFlags is ignored by now, always 8N1
bool pic_serial_Init(pic_serial_Port *port, int baudrate, int lineFlags);
// InitInput initializes input for a serial port. Returns true if success.
bool pic_serial_InitInput(pic_serial_Port *port);
// Write writes a string to a serial port, if the port is usable.
//
// Writes n chars. If n is 0, writes until it reaches NUL.