suu pen
Si5351Aを使用したクロックジェネレータ1MHzから1MHz単位で任意のパルスを出力できる。出力電圧はLM317で変更可能
Dependencies: ACM1602NI DigitalSw Si5351A mbed
Diff: main.cpp
- Revision:
- 0:443d2954b3c3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Mon Jun 19 11:09:29 2017 +0000
@@ -0,0 +1,76 @@
+#include "mbed.h"
+#include "ACM1602NI.h" //https://developer.mbed.org/users/takuo/code/ACM1602NI/docs/661827681a12/classACM1602NI.html
+#include "DigitalSw.h"
+#include "si5351a.h" //https://developer.mbed.org/users/kenjiArai/code/Si5351A/file/af2d99cfb3f0/si5351a.cpp
+
+//#define LPC1114
+/*
+#ifdef LPC1114
+I2C i2c(dp5, dp27); // sda, scl
+#else
+I2C i2c(p9, p10);
+#endif
+*/
+
+ // I2C pins: p9 = sda, p10 = scl
+ACM1602NI lcd(p9, p10); // (sda, scl)
+// ACM1602NI lcd(p28, p27); // (sda, scl)
+
+// Vout mesure
+AnalogIn Vout(p20);
+
+//**************************************************************
+// Si5351a
+SI5351A clk(p28, p27, 25000000UL); // Base clock = 25MHz
+
+ // Digital Sw
+#ifdef LPC1114
+ DigitalSw upSw(dp18);
+ DigitalSw downSw(dp17);
+ DigitalSw startSw(dp16);
+#else
+ DigitalSw upSw(p18);
+ DigitalSw downSw(p17);
+ DigitalSw startSw(p15);
+#endif
+
+ int16_t frequency = 1;
+
+DigitalOut myled(LED1);
+
+void swProcess(void)
+{
+ if(upSw.getOnEdge() == 1){
+ if(frequency < 50){frequency++;}
+ clk.set_frequency(SI5351_CLK0, frequency * 1000000);
+
+ }
+
+ if(downSw.getOnEdge() == 1){
+ if(frequency > 1){frequency--;}
+ clk.set_frequency(SI5351_CLK0, frequency * 1000000);
+ }
+
+ if(startSw.getOnEdge() == 1){
+ frequency = 25;
+ clk.set_frequency(SI5351_CLK0, frequency * 1000000);
+ }
+
+}
+
+
+int main() {
+ clk.set_frequency(SI5351_CLK0, frequency * 1000000);
+
+ while(1) {
+
+ swProcess();
+
+ lcd.printf("Vout = %3.2f [V]\n", Vout * 3.3);
+ lcd.printf("%2d [MHz]\n",frequency);
+ myled = 1;
+ wait(0.2);
+ myled = 0;
+ wait(0.2);
+ }
+}