a hambi
This is a program which can be used for a Direct Digital Synthesizer (DDS), model AD9954. A phase step to a desired final value or a phase ramp from 0 to 359 degree is triggered upon a start signal received by the TeraTerm-Terminal. The RAM is not used in this case.
Revision 6:1cf1523d29f3, committed 2012-11-09
- Comitter:
- ahambi
- Date:
- Fri Nov 09 15:08:10 2012 +0000
- Parent:
- 5:68d93e88377a
- Child:
- 7:32fa7b41a964
- Commit message:
- anna_final_revision;
Changed in this revision
| main.cpp | Show annotated file Show diff for this revision Revisions of this file |
--- a/main.cpp Mon Jul 23 16:23:07 2012 +0000
+++ b/main.cpp Fri Nov 09 15:08:10 2012 +0000
@@ -1,25 +1,14 @@
-// serial port configuration:: http://mbed.org/handbook/Windows-serial-configuration
-
#include "mbed.h"
#include "AD9954.h"
Serial pc(USBTX, USBRX);
DigitalOut myled(LED1);
DigitalOut cs2(p11);
-DigitalOut cs1(p8);//take cs out of the device class
-DigitalOut rst(p9);//take rst out of device class
+DigitalOut cs1(p8);
+DigitalOut rst(p9);
DigitalOut update(p10);
DigitalOut trigger(p13);
AD9954 myDevice(p5, p6, p7, p8, p9, p10);
-
- int read_all()
- {
- pc.printf("\n \n Register 2 = %X ", myDevice.CFR2_read());
- pc.printf("FTWO = %X ", myDevice.FTWO_read());
- pc.printf("Register 1 = %X", myDevice.CFR1_read());
- pc.printf("PHWO = %X \n \n", myDevice.PHWO_read());
- return 0;
- }
int reset()
{
@@ -31,56 +20,19 @@
int ch_1() { cs1 = 0; cs2 = 1; return 0; }
int ch_2() { cs1 = 1; cs2 = 0; return 0; }
-/*
-int set_frequency(double freq, double clock) {
- uint32_t FTWO = 0xFFFFFFFF & (int)(freq/clock*pow(2.0,32.0));
- trigger = 1;
- myDevice.FTW0_write(FTWO);
- pc.printf("frequency set to %f \n \r", freq);
- trigger = 0;
- return 0;
- }*/
-
-int set_frequency(double freq, double clock) {
- uint32_t FTWO1 = 0xFFFFFFFF & (int)((80.0e6-freq/2.0)/clock*pow(2.0,32.0));
- uint32_t FTWO2 = 0xFFFFFFFF & (int)((80.0e6+freq/2.0)/clock*pow(2.0,32.0));
- trigger = 1;
- //ch_1();
- //myDevice.FTW0_write(FTWO1);
- ch_2();
- myDevice.FTW0_write(FTWO2);
- pc.printf("delta frequency set to %f Hz \n \r", freq);
- trigger = 0;
- return 0;}
-
-int set_frequency_not(double freq, double clock) {
- uint32_t FTWO = 0xFFFFFFFF & (int)(freq/clock*pow(2.0,32.0));
- trigger = 1;
- ch_1();
- myDevice.FTW0_write(FTWO);
- ch_2();
- myDevice.FTW0_write(FTWO);
- pc.printf("both channels on: %f Hz \n \r", freq);
- trigger = 0;
- return 0;}
-
int main() {
double freq0;
- freq0 = 80.0e6;
- /*double frequency;
- frequency = 79.98e6; // enter frequency in Hz
- double frequency_new;
- frequency_new = 40.0e3;*/
- double clock = 400.0e6; // clock frequency after multiplier in Hz
+ freq0 = 80.0e6; // Output frequency of both output channels
+ double clock = 400.0e6; // Frequency of external clock signal
trigger = 0;
reset();
-
+
+// Set output channel 1 and 2 to the frequency "freq0":
ch_1();
myDevice.CFR1_write(0x00000200);
-
uint32_t FTWO = 0xFFFFFFFF & (int)(freq0/clock*pow(2.0,32.0));
myDevice.FTW0_write(FTWO);
pc.printf("channel 1 frequency %f \n \r", freq0);
@@ -90,61 +42,54 @@
myDevice.CFR1_write(0x00000200);
myDevice.FTW0_write(FTWO);
- //set_frequency_not(freq0, clock);
double phase = 0.0; // in degree
uint32_t PHWO = int(phase/360.0*pow(2.0,14.0));
myDevice.PHWO_write(PHWO);
-
- double frequency_new;
- frequency_new = 80.0e3;
+
+
+// This sequency watches the TeraTerm-Terminal and triggers actions,
+// when a certain key is pressed:
char std;
while(1) {
pc.scanf("%c",&std);
+ // Ramp channel 1 or channel 2 by pressing entering "1" or "2" in TeraTerm
+ if (std == '1') { ch_1(); pc.printf("ch1 selected \r\n"); };
+ if (std == '2') { ch_2(); pc.printf("ch2 selected \r\n"); };
+ // Enter "p" --> enter the final phase value in degree. The DDS will start to make phase steps 0-->final value with
+ // a 5 kHz frequency. The signal can be observed with the mbed trigger on pin 13
if (std == 'p') {
trigger = 0;
- pc.printf("enter new phase: \r \n");
+ pc.printf("enter final phase: \r \n");
pc.scanf("%lf", &phase);
pc.printf("entered: %lf \r \n", phase);
- ch_2();
uint32_t PHWO = rint(phase/360.0*pow(2.0,14.0));
- trigger = 1;
- myDevice.PHWO_write(PHWO);
- trigger = 0;
- pc.printf("new phase: %lf \r \n ", phase); };
+ while(1) {
+ myDevice.PHWO_write(0);
+ wait_us(200);
+ trigger = 1;
+ myDevice.PHWO_write(PHWO);
+ trigger = 0;
+ if (pc.readable()) break;
+ }};
+ // Enter "r" --> A phase ramp from 0-->359 degree in 700 steps is started. The ramp takes approximately
+ // a millisecond. It is repeated until another key is pressed.
if (std == 'r') {
+ pc.printf("entered r -> starting phase ramp\r \n");
int i;
- int steps = 1;
+ int steps = 700;
double phase0 = 0;
- double phase1 = 50;
+ double phase1 = 359;
double phase_array[steps+1];
uint32_t PHWO [steps+1];
i = 0;
while(i<=steps) {
phase_array[i] = phase0 + (phase1-phase0)/steps*i;
- pc.printf("phase value: %lf", phase_array[i]);
PHWO[i]=rint(phase_array[i]/360.0*pow(2.0,14.0));
i += 1;
}
- // * The Ramp * //
while(1) {
- ch_2();
- myDevice.PHWO_write(PHWO[0]);
- ch_1();
- myDevice.PHWO_write(PHWO[0]);
- trigger = 0;
- wait(1e-3);
- i = 0;
- trigger = 1;
- while(i<=steps) {
- myDevice.PHWO_write(PHWO[i]);
- i+=1;
- }
- wait(10e-3);
- ch_1();
- myDevice.PHWO_write(PHWO[0]);
- ch_2();
myDevice.PHWO_write(PHWO[0]);
trigger = 0;
wait(1e-3);
@@ -153,65 +98,13 @@
while(i<=steps) {
myDevice.PHWO_write(PHWO[i]);
i+=1;
- }
+ }
+ trigger = 0;
wait(10e-3);
+ myDevice.PHWO_write(PHWO[0]);
if (pc.readable()) break;
- }
- //
- };
- if (std == 'f') {
- pc.printf("enter new delta f in kHz: \r \n");
- pc.scanf("%lf", &frequency_new);
- pc.printf("entered: %lf kHz \r \n", frequency_new);
- frequency_new = frequency_new*1.0e3;
- };
- if (std == 'u') {
- pc.printf("entered u. \r\n");
- set_frequency(frequency_new, clock);
- };
- if (std == 'd') {
- pc.printf("entered d. \r\n");
- set_frequency_not(freq0, clock);
- };
+ }};
};
- /*
- while(1) {
- pc.scanf("%lf", &phase);
- pc.printf("entered: %lf \n", phase);
- uint32_t PHWO = rint(phase/360.0*pow(2.0,14.0));
- myDevice.PHWO_write(PHWO);
- pc.printf("new phase: %lf \r", phase);
- }; */
-
- /* double value;
-
- pc.scanf("%lf", &value);
-
- pc.printf("Twice %lf is %lf\n", value, value * 2);*/
-
- /*uint32_t PHWO_Array[7];
-
- int i = 0;
- double delphase = 5.0;
- while (i<=7) {
- PHWO_Array[i] = fmod((phase+i*delphase),360)/360.0*pow(2.0,14.0);
- pc.printf("PHWO_ARRAY %d %f \n", i,phase+i*delphase);
- i += 1;
- }
- i = 0;
- while(true) {
- //PHWO = rint(phase/360.0*pow(2.0,14.0));
- //PHWO = fmod((phase+i*delphase),360)/360.0*pow(2.0,14.0);
- myDevice.PHWO_write(PHWO_Array[i]);
- //myDevice.PHWO_write(PHWO);
- //pc.printf("PHWO_ARRAY %d %x \n", i, PHWO);
- wait(2.0);
- i += 1;
- if (i == 7){
- i = 0; };
- }*/
-
- //read_all();
return 0;
}
\ No newline at end of file