ua1zbe
a1206d6fd4
Features: - VFO mode with direct frequency input - POCSAG decoder (512/1200 baud) with BCH(31,21) correction - Full-screen Spectrum analyzer - FM Radio receiver - RSSI signal indicator overlay - Custom boot splash (UA1ZBE / POCSAG pager / build date) Architecture: - app/mode.c — mode dispatcher (VFO/POCSAG/Spectrum/FM) - app/boot_splash.c — 2-second boot splash - app/pocsag/ — POCSAG decoder + BCH correction - app/display_rssi.c — RSSI indicator - main.c — entry point with custom init - syscalls.c — bare-metal _sbrk stub Build: arm-none-eabi-gcc -Os -flto -Wall -Werror -Wextra Size: 57.9KB Flash / 3.6KB RAM Controls: - 0-9: Direct frequency input (VFO) - SK2: POCSAG mode - SK1: Spectrum analyzer - 0: FM Radio - EXIT: Return to VFO - F/*: Toggle 512/1200 baud (in POCSAG)
129 lines
3.5 KiB
C
129 lines
3.5 KiB
C
/* UA1ZBE Custom Firmware - RSSI Display Implementation
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*
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* Reads RSSI from BK4819 REG_67 (9-bit value).
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* Conversion: dBm = (raw / 2) - 160 + band_correction
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*
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* Displays as "S:XX" format with optional mini bar.
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* Updates every ~150ms via internal counter.
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*/
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#include "display_rssi.h"
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#include "driver/bk4819.h"
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#include "driver/st7565.h"
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#include "ui/helper.h"
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#include "ui/main.h"
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#include "misc.h"
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#include "radio.h"
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#include <string.h>
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#include <stdio.h>
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/* dBm correction table — defined in ui/main.c */
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extern const int8_t dBmCorrTable[7];
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/* === Internal state === */
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static int16_t s_rssi_dbm;
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static uint16_t s_rssi_raw;
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static uint8_t s_s_level;
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static uint16_t s_update_counter;
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/* Update interval: ~15 (150ms at 10ms tick) */
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#define RSSI_UPDATE_INTERVAL 15
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/* S-meter thresholds (dBm) — simplified from U8RssiMap */
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static const int8_t s_thresholds[] = {
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-121, -115, -109, -103, -97, -91, -85, -79, -73, -63
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};
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void RSSI_Init(void)
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{
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s_rssi_dbm = -160;
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s_rssi_raw = 0;
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s_s_level = 0;
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s_update_counter = 0;
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}
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void RSSI_Update(void)
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{
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s_update_counter++;
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if (s_update_counter < RSSI_UPDATE_INTERVAL)
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return;
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s_update_counter = 0;
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/* Read raw RSSI from BK4819 */
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s_rssi_raw = BK4819_GetRSSI();
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/* Convert to dBm: (raw / 2) - 160 + band_correction
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* Avoid division: raw >> 1 */
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int8_t band_corr = dBmCorrTable[gRxVfo->Band];
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s_rssi_dbm = (int16_t)(s_rssi_raw >> 1) - 160 + band_corr;
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/* Calculate S-level */
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s_s_level = 0;
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for (uint8_t i = 0; i < ARRAY_SIZE(s_thresholds); i++) {
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if (s_rssi_dbm >= s_thresholds[i]) {
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s_s_level = i + 1;
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}
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}
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if (s_s_level > 9)
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s_s_level = 9;
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}
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int16_t RSSI_GetdBm(void)
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{
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return s_rssi_dbm;
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}
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uint16_t RSSI_GetRaw(void)
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{
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return s_rssi_raw;
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}
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uint8_t RSSI_GetSLevel(void)
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{
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return s_s_level;
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}
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/*
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* Draw RSSI indicator.
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* Format: "S:42" or raw dBm with mini bar.
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* Uses small font to fit in upper-right corner.
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*/
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void RSSI_Draw(int x, int y, bool with_bar)
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{
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static char buf[16];
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/* Draw dBm value: "-87dBm" */
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sprintf(buf, "%ddBm", s_rssi_dbm);
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UI_PrintStringSmallNormal(buf, x, LCD_WIDTH, y);
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if (with_bar) {
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/* Draw mini signal bar below the text
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* 5 bars, each 2px wide, 1px gap */
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int bar_x = x;
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int bar_y = y + 8;
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uint8_t bars = (s_s_level + 1) / 2; /* 0-5 bars from S0-S9 */
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if (bars > 5) bars = 5;
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for (uint8_t i = 0; i < 5; i++) {
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uint8_t h = 2 + i * 2; /* Bar heights: 2,4,6,8,10 */
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if (i < bars) {
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/* Draw filled bar */
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for (uint8_t py = 0; py < h; py++) {
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for (uint8_t px = 0; px < 2; px++) {
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3 + px, bar_y + (10 - h) + py, true);
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}
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}
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} else {
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/* Draw outline only */
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3, bar_y + (10 - h), false);
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3 + 1, bar_y + (10 - h), false);
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3, bar_y + 9, false);
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3 + 1, bar_y + 9, false);
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3, bar_y + (10 - h) + 1, false);
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UI_DrawPixelBuffer(gFrameBuffer, bar_x + i * 3 + 1, bar_y + (10 - h) + 1, false);
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}
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}
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}
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}
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