a hambi / Mbed 2 deprecated code2_Phase_steps_and_slow_phase_ramp_wo_RAM

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.

Dependencies:   mbed

main.cpp@7:32fa7b41a964, 2012-11-09 (annotated)

Committer:
ahambi
Date:
Fri Nov 09 15:45:19 2012 +0000
Revision:
7:32fa7b41a964
Parent:
6:1cf1523d29f3 
menu added;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ahambi 7:32fa7b41a964 1 // *******************************************
ahambi 7:32fa7b41a964 2 // *** phase ramps & steps without the RAM ***
ahambi 7:32fa7b41a964 3 // *******************************************
ahambi 7:32fa7b41a964 4
ahambi 0:930cad3922ee 5 #include "mbed.h"
ahambi 0:930cad3922ee 6 #include "AD9954.h"
ahambi 0:930cad3922ee 7
ahambi 0:930cad3922ee 8 Serial pc(USBTX, USBRX);
ahambi 0:930cad3922ee 9 DigitalOut myled(LED1);
ahambi 0:930cad3922ee 10 DigitalOut cs2(p11);
ahambi 6:1cf1523d29f3 11 DigitalOut cs1(p8);
ahambi 6:1cf1523d29f3 12 DigitalOut rst(p9);
ahambi 0:930cad3922ee 13 DigitalOut update(p10);
ahambi 0:930cad3922ee 14 DigitalOut trigger(p13);
ahambi 0:930cad3922ee 15 AD9954 myDevice(p5, p6, p7, p8, p9, p10);
ahambi 0:930cad3922ee 16
ahambi 0:930cad3922ee 17 int reset()
ahambi 0:930cad3922ee 18 {
ahambi 0:930cad3922ee 19 rst = 1;
ahambi 0:930cad3922ee 20 wait(0.1);
ahambi 0:930cad3922ee 21 rst = 0 ;
ahambi 0:930cad3922ee 22 return 0;
ahambi 0:930cad3922ee 23 }
ahambi 0:930cad3922ee 24
ahambi 0:930cad3922ee 25 int ch_1() { cs1 = 0; cs2 = 1; return 0; }
ahambi 0:930cad3922ee 26 int ch_2() { cs1 = 1; cs2 = 0; return 0; }
ahambi 0:930cad3922ee 27
ahambi 0:930cad3922ee 28 int main() {
ahambi 0:930cad3922ee 29
ahambi 7:32fa7b41a964 30 pc.printf("*************************************************** \n \r");
ahambi 7:32fa7b41a964 31 pc.printf("*** Phase steps and slow phase ramp without RAM *** \n \r");
ahambi 7:32fa7b41a964 32 pc.printf("*************************************************** \n \r");
ahambi 7:32fa7b41a964 33 pc.printf("Enter: \n \r");
ahambi 7:32fa7b41a964 34 pc.printf("'1' or '2' --> which output channel should be ramped. \n \r");
ahambi 7:32fa7b41a964 35 pc.printf("'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 \n \r");
ahambi 7:32fa7b41a964 36 pc.printf("'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.\n \r");
ahambi 7:32fa7b41a964 37
ahambi 0:930cad3922ee 38 double freq0;
ahambi 6:1cf1523d29f3 39 freq0 = 80.0e6; // Output frequency of both output channels
ahambi 6:1cf1523d29f3 40 double clock = 400.0e6; // Frequency of external clock signal
ahambi 0:930cad3922ee 41 trigger = 0;
ahambi 0:930cad3922ee 42 reset();
ahambi 6:1cf1523d29f3 43
ahambi 6:1cf1523d29f3 44 // Set output channel 1 and 2 to the frequency "freq0":
ahambi 0:930cad3922ee 45 ch_1();
ahambi 4:c3a96bc6ab19 46
ahambi 0:930cad3922ee 47 myDevice.CFR1_write(0x00000200);
ahambi 0:930cad3922ee 48 uint32_t FTWO = 0xFFFFFFFF & (int)(freq0/clock*pow(2.0,32.0));
ahambi 0:930cad3922ee 49 myDevice.FTW0_write(FTWO);
ahambi 0:930cad3922ee 50 pc.printf("channel 1 frequency %f \n \r", freq0);
ahambi 4:c3a96bc6ab19 51
ahambi 0:930cad3922ee 52
ahambi 0:930cad3922ee 53 ch_2();
ahambi 0:930cad3922ee 54
ahambi 0:930cad3922ee 55 myDevice.CFR1_write(0x00000200);
ahambi 0:930cad3922ee 56 myDevice.FTW0_write(FTWO);
ahambi 0:930cad3922ee 57
ahambi 0:930cad3922ee 58 double phase = 0.0; // in degree
ahambi 0:930cad3922ee 59 uint32_t PHWO = int(phase/360.0*pow(2.0,14.0));
ahambi 0:930cad3922ee 60 myDevice.PHWO_write(PHWO);
ahambi 6:1cf1523d29f3 61
ahambi 6:1cf1523d29f3 62
ahambi 6:1cf1523d29f3 63 // This sequency watches the TeraTerm-Terminal and triggers actions,
ahambi 6:1cf1523d29f3 64 // when a certain key is pressed:
ahambi 0:930cad3922ee 65
ahambi 0:930cad3922ee 66 char std;
ahambi 0:930cad3922ee 67 while(1) {
ahambi 0:930cad3922ee 68 pc.scanf("%c",&std);
ahambi 6:1cf1523d29f3 69 // Ramp channel 1 or channel 2 by pressing entering "1" or "2" in TeraTerm
ahambi 6:1cf1523d29f3 70 if (std == '1') { ch_1(); pc.printf("ch1 selected \r\n"); };
ahambi 6:1cf1523d29f3 71 if (std == '2') { ch_2(); pc.printf("ch2 selected \r\n"); };
ahambi 6:1cf1523d29f3 72 // Enter "p" --> enter the final phase value in degree. The DDS will start to make phase steps 0-->final value with
ahambi 6:1cf1523d29f3 73 // a 5 kHz frequency. The signal can be observed with the mbed trigger on pin 13
ahambi 0:930cad3922ee 74 if (std == 'p') {
ahambi 0:930cad3922ee 75 trigger = 0;
ahambi 6:1cf1523d29f3 76 pc.printf("enter final phase: \r \n");
ahambi 0:930cad3922ee 77 pc.scanf("%lf", &phase);
ahambi 0:930cad3922ee 78 pc.printf("entered: %lf \r \n", phase);
ahambi 0:930cad3922ee 79 uint32_t PHWO = rint(phase/360.0*pow(2.0,14.0));
ahambi 6:1cf1523d29f3 80 while(1) {
ahambi 6:1cf1523d29f3 81 myDevice.PHWO_write(0);
ahambi 6:1cf1523d29f3 82 wait_us(200);
ahambi 6:1cf1523d29f3 83 trigger = 1;
ahambi 6:1cf1523d29f3 84 myDevice.PHWO_write(PHWO);
ahambi 6:1cf1523d29f3 85 trigger = 0;
ahambi 6:1cf1523d29f3 86 if (pc.readable()) break;
ahambi 6:1cf1523d29f3 87 }};
ahambi 6:1cf1523d29f3 88 // Enter "r" --> A phase ramp from 0-->359 degree in 700 steps is started. The ramp takes approximately
ahambi 6:1cf1523d29f3 89 // a millisecond. It is repeated until another key is pressed.
ahambi 1:d5557c1daab5 90 if (std == 'r') {
ahambi 6:1cf1523d29f3 91 pc.printf("entered r -> starting phase ramp\r \n");
ahambi 2:4d8f768aeb0d 92 int i;
ahambi 6:1cf1523d29f3 93 int steps = 700;
ahambi 4:c3a96bc6ab19 94 double phase0 = 0;
ahambi 6:1cf1523d29f3 95 double phase1 = 359;
ahambi 5:68d93e88377a 96 double phase_array[steps+1];
ahambi 5:68d93e88377a 97 uint32_t PHWO [steps+1];
ahambi 2:4d8f768aeb0d 98 i = 0;
ahambi 5:68d93e88377a 99 while(i<=steps) {
ahambi 2:4d8f768aeb0d 100 phase_array[i] = phase0 + (phase1-phase0)/steps*i;
ahambi 2:4d8f768aeb0d 101 PHWO[i]=rint(phase_array[i]/360.0*pow(2.0,14.0));
ahambi 2:4d8f768aeb0d 102 i += 1;
ahambi 2:4d8f768aeb0d 103 }
ahambi 5:68d93e88377a 104 while(1) {
ahambi 5:68d93e88377a 105 myDevice.PHWO_write(PHWO[0]);
ahambi 5:68d93e88377a 106 trigger = 0;
ahambi 5:68d93e88377a 107 wait(1e-3);
ahambi 5:68d93e88377a 108 i = 0;
ahambi 5:68d93e88377a 109 trigger = 1;
ahambi 5:68d93e88377a 110 while(i<=steps) {
ahambi 4:c3a96bc6ab19 111 myDevice.PHWO_write(PHWO[i]);
ahambi 4:c3a96bc6ab19 112 i+=1;
ahambi 6:1cf1523d29f3 113 }
ahambi 6:1cf1523d29f3 114 trigger = 0;
ahambi 5:68d93e88377a 115 wait(10e-3);
ahambi 6:1cf1523d29f3 116 myDevice.PHWO_write(PHWO[0]);
ahambi 5:68d93e88377a 117 if (pc.readable()) break;
ahambi 6:1cf1523d29f3 118 }};
ahambi 0:930cad3922ee 119 };
ahambi 0:930cad3922ee 120
ahambi 0:930cad3922ee 121 return 0;
ahambi 0:930cad3922ee 122 }