mbed code for Farrari board
Dependencies: DDRO_Farrari mbed
Fork of DDRO_Farrari by
clock.cpp
00001 #include "clock.h" 00002 00003 float ext_freq(DigitalIn* clk_pin) 00004 { 00005 bool last = false; 00006 unsigned int count = 0; 00007 00008 Timer t; 00009 t.start(); 00010 for(int i=0; i<100000; i++){ 00011 bool clkval = *clk_pin; 00012 if(clkval && !last){ 00013 count++; 00014 } 00015 last = clkval; 00016 } 00017 float time = t.read(); 00018 t.stop(); 00019 if(count < 1000){ 00020 dual_printf("Clk read inaccurate"); 00021 pc.printf("Clk count %d\r\n", count); 00022 } 00023 //pc.printf("T: %f\r\nC: %i\r\n", time, count); 00024 00025 return count / time; 00026 }
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