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/*
* HD44780 LCD via PCF8574 I2C backpack + USB mirror.
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#include "display.h"
#include "board_pins.h"
#include "config.h"
#include "status.h"
#include "sense.h"
#include "ptt.h"
#include "hardware/i2c.h"
#include "pico/stdlib.h"
#include <stdio.h>
#include <string.h>
#include <stdint.h>
/* PCF8574 bit map (common backpack): P0=RS P1=RW P2=E P3=BL P4-7=D4-D7 */
#define LCD_RS 0x01
#define LCD_RW 0x02
#define LCD_EN 0x04
#define LCD_BL 0x08
static bool g_lcd;
static uint8_t g_addr = I2C_LCD_ADDR_DEFAULT;
static char g_last_l0[17];
static char g_last_l1[17];
static bool i2c_write_u8(uint8_t addr, uint8_t v)
{
return i2c_write_blocking(i2c0, addr, &v, 1, false) >= 0;
}
static bool i2c_probe(uint8_t addr)
{
uint8_t b = 0;
return i2c_write_blocking(i2c0, addr, &b, 1, false) >= 0;
}
static void lcd_write4(uint8_t nibble, uint8_t mode)
{
uint8_t data = (uint8_t)((nibble & 0xF0) | LCD_BL | mode);
i2c_write_u8(g_addr, (uint8_t)(data | LCD_EN));
sleep_us(1);
i2c_write_u8(g_addr, (uint8_t)(data & (uint8_t)~LCD_EN));
sleep_us(50);
}
static void lcd_send(uint8_t value, uint8_t mode)
{
lcd_write4((uint8_t)(value & 0xF0), mode);
lcd_write4((uint8_t)((value << 4) & 0xF0), mode);
}
static void lcd_cmd(uint8_t c)
{
lcd_send(c, 0);
}
static void lcd_data(uint8_t c)
{
lcd_send(c, LCD_RS);
}
static void lcd_set_cursor(uint8_t col, uint8_t row)
{
static const uint8_t row_addr[] = {0x00, 0x40, 0x14, 0x54};
if (row > 1) {
row = 1;
}
lcd_cmd((uint8_t)(0x80 | (row_addr[row] + col)));
}
static void lcd_print_line(uint8_t row, const char *s)
{
char buf[17];
size_t n = strlen(s);
if (n > 16) {
n = 16;
}
memset(buf, ' ', 16);
memcpy(buf, s, n);
buf[16] = '\0';
lcd_set_cursor(0, row);
for (int i = 0; i < 16; i++) {
lcd_data((uint8_t)buf[i]);
}
}
static bool lcd_init_seq(uint8_t addr)
{
g_addr = addr;
sleep_ms(50);
lcd_write4(0x30, 0);
sleep_ms(5);
lcd_write4(0x30, 0);
sleep_us(150);
lcd_write4(0x30, 0);
sleep_us(150);
lcd_write4(0x20, 0); /* 4-bit */
lcd_cmd(0x28); /* 2 line, 5x8 */
lcd_cmd(0x0C); /* display on, cursor off */
lcd_cmd(0x06); /* entry mode */
lcd_cmd(0x01); /* clear */
sleep_ms(2);
return true;
}
void display_init(void)
{
g_lcd = false;
g_last_l0[0] = '\0';
g_last_l1[0] = '\0';
uint8_t addrs[] = {0x27, 0x3F};
for (unsigned i = 0; i < sizeof(addrs); i++) {
if (i2c_probe(addrs[i])) {
if (lcd_init_seq(addrs[i])) {
g_lcd = true;
if (config_unsolicited_ok()) {
printf("LCD: HD44780 @ 0x%02X\r\n", addrs[i]);
}
return;
}
}
}
if (config_unsolicited_ok()) {
printf("LCD: none — USB status only\r\n");
}
}
bool display_present(void)
{
return g_lcd;
}
void display_show(const char *line)
{
if (!line) {
return;
}
if (g_lcd) {
lcd_print_line(0, line);
}
}
void display_update(void)
{
const c1224_config_t *cfg = config_get();
char l0[17];
char l1[17];
c1224_state_t st = status_get();
if (st == C1224_STATE_FAULT) {
snprintf(l0, sizeof(l0), "%.16s", cfg->fault);
} else if (ptt_get()) {
snprintf(l0, sizeof(l0), "%.16s", cfg->sending);
} else if (st == C1224_STATE_STARTING) {
snprintf(l0, sizeof(l0), "%.16s", cfg->starting);
} else {
/* Power/ready on line 0 */
snprintf(l0, sizeof(l0), "%.16s", cfg->ready);
}
/* Line 1: Signal + Packet from sense */
bool sig = sense_signal_active();
bool pkt = sense_packet_active();
if (sig && pkt) {
snprintf(l1, sizeof(l1), "%.7s %.7s", cfg->signal, cfg->packet);
} else if (sig) {
snprintf(l1, sizeof(l1), "%.16s", cfg->signal);
} else if (pkt) {
snprintf(l1, sizeof(l1), "%.16s", cfg->packet);
} else {
snprintf(l1, sizeof(l1), "%.16s", cfg->power);
}
if (strcmp(l0, g_last_l0) != 0 || strcmp(l1, g_last_l1) != 0) {
strncpy(g_last_l0, l0, sizeof(g_last_l0));
strncpy(g_last_l1, l1, sizeof(g_last_l1));
g_last_l0[16] = '\0';
g_last_l1[16] = '\0';
if (g_lcd) {
lcd_print_line(0, l0);
lcd_print_line(1, l1);
}
}
}
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