neocturne/avr-kbd
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Implemented all that foo

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This commit is contained in:
Matthias Schiffer 2012-12-06 15:27:07 +01:00
parent 4b49d4e946
commit 5b3ab9f2ac
2 changed files with 103 additions and 12 deletions
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9
CMakeLists.txt
View file

@ -1,7 +1,7 @@
cmake_minimum_required(VERSION 2.8.3)
SET(BOARD "atmega328" CACHE STRING "AVR CPU to build for")
SET(BOARD "atmega328p" CACHE STRING "AVR CPU to build for")
SET(CLOCK "16000000" CACHE STRING "CPU clock")
SET(FLASH_FLAGS "-patmega328p" "-carduino" "-P/dev/ttyUSB0" "-b57600" CACHE STRING "avrdude flags")
@ -13,12 +13,6 @@ find_program(AVRDUDE avrdude)
SET(CMAKE_SYSTEM_NAME Generic)
#SET(CWARN "-Wall")
#SET(CTUNING "-funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums")
#SET(COPT "-Os")
#SET(CMCU "-mmcu=${BOARD}")
#SET(CDEFS "-DF_CPU=${CLOCK}")
SET(CMAKE_C_COMPILER ${AVR_GCC})
project(ARDKBD C)
@ -31,6 +25,7 @@ add_executable(ardkbd.elf
)
set_target_properties(ardkbd.elf PROPERTIES
COMPILE_FLAGS "-Wall -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Os -mmcu=${BOARD}"
LINK_FLAGS "-Wall -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums -Os -mmcu=${BOARD}"
COMPILE_DEFINITIONS "F_CPU=${CLOCK}"
)

106
ardkbd.c
View file

@ -1,18 +1,114 @@
#include <avr/io.h>
#include <avr/interrupt.h>
#include <util/delay.h>
#include <stdbool.h>
#include <stdint.h>
static volatile uint8_t kbd_state = 0;
static volatile uint8_t kbd_input = 0;
static volatile uint8_t kbd_flags = 0;
#define KBD_FLAG_ERROR (_BV(0))
#define KBD_FLAG_BREAK (_BV(1))
#define KBD_FLAG_EXT (_BV(2))
#define KBD_CODE_UP 0xe075
#define KBD_CODE_LEFT 0xe06b
#define KBD_CODE_DOWN 0xe072
#define KBD_CODE_RIGHT 0xe074
int main() {
DDRB = 0xFF;
static inline bool kbd_data() {
return (PINC & (1 << 0));
}
static inline bool kbd_clock() {
return (PINC & (1 << 1));
}
ISR(PCINT1_vect) {
if (kbd_clock())
return;
bool data = kbd_data();
if (kbd_state == 0) {
if (!data) { /* start bit */
kbd_input = 0;
kbd_state++;
}
return;
}
if (kbd_state <= 8) {
kbd_input |= (data << (kbd_state-1));
kbd_state++;
return;
}
if (kbd_state == 9) {
if ((__builtin_popcount(kbd_input) & 1) == data)
kbd_flags |= KBD_FLAG_ERROR;
kbd_state++;
return;
}
kbd_state = 0;
if (kbd_flags & KBD_FLAG_ERROR) {
/* Retry */
return;
}
if (kbd_input == 0xe0) {
kbd_flags |= KBD_FLAG_EXT;
return;
}
if (kbd_input == 0xf0) {
kbd_flags |= KBD_FLAG_BREAK;
return;
}
uint16_t code = kbd_input;
if (kbd_flags & KBD_FLAG_EXT)
code |= 0xe000;
if (!(kbd_flags & KBD_FLAG_BREAK)) {
switch (code) {
case KBD_CODE_UP:
PORTB = 0x20;
break;
case KBD_CODE_DOWN:
PORTB = 0;
break;
}
}
kbd_flags = 0;
}
int main(void) {
DDRB = 0xff;
PORTB = 0;
DDRC = 0x00;
PORTC = 0x03;
PCMSK1 = (1 << PCINT9);
PCICR = (1 << PCIE1);
sei();
while(true) {
_delay_ms(1000);
PORTB ^= 0x20;
}
return 0;