some more testing

libraries/SondeLib/Scanner.cpp

@@ -1,21 +1,65 @@
 #include "Scanner.h"
 #include <SX1278FSK.h>
+#include <U8x8lib.h>
 
-#define CHANBW 7.5
+extern U8X8_SSD1306_128X64_NONAME_SW_I2C u8x8;
-#define SMOOTH 1
+
+#define CHANBW 25
+#define SMOOTH 2
 #define STARTF 400000000
 #define NCHAN ((int)(6000/CHANBW))
 
 int scanresult[NCHAN];
 int scandisp[NCHAN/2];
 
+#define PLOT_N 120
+#define PLOT_MIN -220
+#define PLOT_SCALE(x) (x<PLOT_MIN?0:(x-PLOT_MIN)/2)
+
+const byte tilepatterns[9]={0,0x80,0xC0,0xE0,0xF0,0xF8,0xFC,0xFE,0xFF};
+void Scanner::fillTiles(uint8_t *row, int value) {
+	for(int y=0; y<8; y++) {
+		int nbits = value - 8*(7-y);
+		if(nbits<0) { row[8*y]=0; continue; }
+		if(nbits>=8) { row[8*y]=255; continue; }
+		row[8*y] = tilepatterns[nbits];
+	}
+}
+/*
+ * There are 16*8 columns to plot, NPLOT must be lower than that
+ * currently, we use 120 * 50kHz channels
+ * There are 8*8 values to plot; MIN is bottom end, 
+ */
+uint8_t tiles[16] = { 0x0f,0x0f,0x0f,0x0f,0xf0,0xf0,0xf0,0xf0, 1, 3, 7, 15, 31, 63, 127, 255};
+void Scanner::plotResult()
+{
+	uint8_t row[8*8];
+	for(int i=0; i<PLOT_N; i+=8) {
+		for(int j=0; j<8; j++) {
+			fillTiles(row+j, PLOT_SCALE(scandisp[i+j]));
+		}
+		for(int y=0; y<8; y++) {
+			u8x8.drawTile(i/8, y, 1, row+8*y);
+		}
+	}
+}
+
 void Scanner::scan()
 {
+#if 0
+	// Test only
+	for(int i=0; i<PLOT_N; i++) {
+		scandisp[i] = 30*sin(2*3.1415*i/50)-180;
+	}
+	return;
+#endif
 	// Configure 
 	sx1278.writeRegister(REG_PLL_HOP, 0x80);   // FastHopOn
 	sx1278.setRxBandwidth(CHANBW*1000);
 	sx1278.writeRegister(REG_RSSI_CONFIG, SMOOTH&0x07);
+	sx1278.setFrequency(STARTF);
 	sx1278.writeRegister(REG_OP_MODE, FSK_RX_MODE);
+	delay(5);
 
 	unsigned long start = millis();
 	uint32_t lastfrf=-1;
@@ -33,7 +77,7 @@ void Scanner::scan()
 		// Wait TS_HOP (20us) + TS_RSSI ( 2^(SMOOTH+1) / 4 / CHANBW us)
 		int wait = 20 + 1000*(1<<(SMOOTH+1))/4/CHANBW;
 		delayMicroseconds(wait);
-		int rssi = -sx1278.readRegister(REG_RSSI_VALUE_FSK)/2;
+		int rssi = -(int)sx1278.readRegister(REG_RSSI_VALUE_FSK);
 		scanresult[i] = rssi;
 	}
 	unsigned long duration = millis()-start;

libraries/SondeLib/Scanner.h

@@ -3,9 +3,20 @@
 #ifndef _SCANNER_H
 #define _SCANNER_H
 
+#include <stdlib.h>
+#include <stdint.h>
+#include <Arduino.h>
+#ifndef inttypes_h
+        #include <inttypes.h>
+#endif
+
 class Scanner
 {
+private:
+	void fillTiles(uint8_t *row, int value);
+
 public:	
+	void plotResult();
 	void scan(void);
 };