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Refactored display intf routines into module

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This commit is contained in:
Gregor Riepl 2021-03-09 12:09:48 +01:00
parent 6b58fc2738
commit a2a0ab6865
2 changed files with 20 additions and 109 deletions
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2
display/firmware/Makefile
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@ -1,7 +1,7 @@
PRG = display
PROJ_ROOT = ../..
AVRCANLIB_PATH = $(PROJ_ROOT)/avr-can-lib
OBJ = main.o \
OBJ = main.o display.o \
$(AVRCANLIB_PATH)/src/at90can_buffer.o \
$(AVRCANLIB_PATH)/src/at90can.o \
$(AVRCANLIB_PATH)/src/at90can_disable_dyn_filter.o \

127
display/firmware/main.c
View file

@ -5,11 +5,16 @@
#include <util/delay.h>
#include <can.h>
#include <messages.h>
#include "display.h"
static bool report_change = false;
static void init() {
/*
static void init();
static uint8_t get_buttons();
static void send_status();
static void loop();
/* I/O map:
PB2 BUTTON0
PB3 BUTTON1
PB4 BUTTON2
@ -31,16 +36,18 @@ static void init() {
PD5 VFDDB5
PD6 VFDDB6
PD7 VFDDB7
*/
*/
static void init() {
// initialize buttons
// PB2, PB3, PB4, PB5, PB6, PC0, PC1, PC4: input, no pullup (button0..7)
// PC5, PC6, PC7: output (VFD RS, RW, E), RS=0, RW=H, E=H
// PD: output (VFD DB) - can be switched to input w/ pullup
PORTB = 0x00;
DDRB = 0x00;
PORTC = _BV(PC6) | _BV(PC7);
DDRC = _BV(PC5) | _BV(PC6) | _BV(PC7);
PORTD = 0x00;
DDRD = 0xff;
PORTB &= ~(_BV(PB2) | _BV(PB3) | _BV(PB4) | _BV(PB5) | _BV(PB6));
DDRB &= ~(_BV(PB2) | _BV(PB3) | _BV(PB4) | _BV(PB5) | _BV(PB6));
PORTC &= ~(_BV(PC0) | _BV(PC1) | _BV(PC4));
DDRC &= ~(_BV(PC0) | _BV(PC1) | _BV(PC4));
// initialize VFD
display_init();
// Initialize CAN interface
can_init(BITRATE_125_KBPS);
@ -103,102 +110,6 @@ static void send_status() {
}
}
static uint8_t read_ir() {
// switch PD to input
DDRD = 0x00;
// E=0 (enable/clock) RS=0 (IR) RW=1 (read)
PORTC = (PORTC & ~(_BV(PC5) | _BV(PC7))) | _BV(PC6);
_delay_us(0.23);
// E=1 (enable/clock)
PORTC |= _BV(PC7);
_delay_us(0.16);
uint8_t data = PIND;
_delay_us(0.23 - 0.16);
// E=0 (enable/clock)
PORTC &= ~_BV(PC7);
_delay_us(0.01);
// reset to idle
PORTC = _BV(PC6) | _BV(PC7);
DDRD = 0xff;
return data;
}
static uint8_t read_dr() {
// switch PD to input
DDRD = 0x00;
// E=0 (enable/clock) RS=1 (IR) RW=1 (read)
PORTC = (PORTC & ~_BV(PC7)) | (_BV(PC5) | _BV(PC6));
_delay_us(0.23);
// E=1 (enable/clock)
PORTC |= _BV(PC7);
_delay_us(0.16);
uint8_t data = PIND;
_delay_us(0.23 - 0.16);
// E=0 (enable/clock)
PORTC &= ~_BV(PC7);
_delay_us(0.01);
// reset to idle
PORTC = _BV(PC6) | _BV(PC7);
DDRD = 0xff;
return data;
}
static void write_ir(uint8_t data) {
// E=0 (enable/clock) RS=0 (IR) RW=0 (write)
PORTC &= ~(_BV(PC5) | _BV(PC6) | _BV(PC7));
_delay_us(0.23);
// E=1 (enable/clock)
PORTC |= _BV(PC7);
// data
PORTD = data;
_delay_us(0.23);
// E=0 (enable/clock)
PORTC &= ~_BV(PC7);
_delay_us(0.01);
// reset to idle
PORTC = _BV(PC6) | _BV(PC7);
PORTD = 0x00;
}
static void write_dr(uint8_t data) {
// E=0 (enable/clock) RS=1 (IR) RW=0 (write)
PORTC = (PORTC & ~(_BV(PC6) | _BV(PC7))) | _BV(PC5);
_delay_us(0.23);
// E=1 (enable/clock)
PORTC |= _BV(PC7);
// data
PORTD = data;
_delay_us(0.23);
// E=0 (enable/clock)
PORTC &= ~_BV(PC7);
_delay_us(0.01);
// reset to idle
PORTC = _BV(PC6) | _BV(PC7);
PORTD = 0x00;
}
static bool wait_ready() {
// if the busy flag never goes high, we'll run into a deadlock here.
// let's put a deadline on the wait loop.
for (uint8_t i = 0; i < 100; i++) {
// read_ir() takes about 500ns
if (read_ir() & _BV(7)) return true;
// wait 10us until the next status read
_delay_us(10 - 0.5);
}
return false;
}
static void write_display(uint8_t command, const uint8_t *data, uint8_t length) {
if (wait_ready()) {
write_ir(command);
for (uint8_t i = 0; i < length; i++) {
write_dr(data[i]);
}
}
}
static void loop() {
// Check for new messages
if (can_check_message()) {
@ -211,7 +122,7 @@ static void loop() {
break;
case CAN_MSG_DISPLAY_CMD:
if (msg.length >= 1) {
write_display(msg.data[0], &msg.data[1], msg.length - 1);
display_write(msg.data[0], &msg.data[1], msg.length - 1);
}
break;
case CAN_MSG_AUTO_STATUS: