Ryo Od / Mbed 2 deprecated Nucleo-F767_DCO_Test01

Nucleo-F767 DCO Test 01

Dependencies:   mbed

main.cpp@4:b242f4206894, 2018-08-19 (annotated)

Committer:
ryood
Date:
Sun Aug 19 01:07:58 2018 +0000
Revision:
4:b242f4206894
Parent:
3:19bb7c30c354 
first commit;

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ryood 0:000c6506ff90 1 /*
ryood 4:b242f4206894 2 Nucleo F767 DCO Test01
ryood 0:000c6506ff90 3 2018.07.22
ryood 0:000c6506ff90 4
ryood 0:000c6506ff90 5 */
ryood 0:000c6506ff90 6 #include "mbed.h"
ryood 0:000c6506ff90 7
ryood 2:4834d4483ea6 8 #include "wavetable_12bit_32k.h"
ryood 2:4834d4483ea6 9 #define COUNT_OF_ENTRIES (32768)
ryood 0:000c6506ff90 10
ryood 0:000c6506ff90 11 #define PIN_CHECK (1)
ryood 0:000c6506ff90 12 #define UART_TRACE (0)
ryood 4:b242f4206894 13 #define TITLE_STR1 ("Nucleo F767 DCO Test01")
ryood 4:b242f4206894 14 #define TITLE_STR2 ("20180819")
ryood 4:b242f4206894 15
ryood 0:000c6506ff90 16
ryood 0:000c6506ff90 17 // Pin Assign
ryood 0:000c6506ff90 18 AnalogOut Dac1(PA_4);
ryood 0:000c6506ff90 19 AnalogOut Dac2(PA_5);
ryood 0:000c6506ff90 20
ryood 0:000c6506ff90 21 #if (PIN_CHECK)
ryood 4:b242f4206894 22 DigitalOut CheckPin1(D4);
ryood 4:b242f4206894 23 DigitalOut CheckPin2(D5);
ryood 0:000c6506ff90 24 #endif
ryood 0:000c6506ff90 25
ryood 0:000c6506ff90 26 // Parameter
ryood 4:b242f4206894 27 double drate = 1000.0; // initial output rate (Hz)
ryood 4:b242f4206894 28 const double refclk = 100000; // 100kHz
ryood 0:000c6506ff90 29
ryood 0:000c6506ff90 30 // Interruput
ryood 0:000c6506ff90 31 Ticker ticker;
ryood 0:000c6506ff90 32
ryood 0:000c6506ff90 33 // DDS
ryood 0:000c6506ff90 34 volatile uint32_t phaccu;
ryood 0:000c6506ff90 35 volatile uint32_t tword_m;
ryood 0:000c6506ff90 36
ryood 0:000c6506ff90 37 //-------------------------------------------------------------------------------------------------
ryood 0:000c6506ff90 38 // Interrupt Service Routine
ryood 0:000c6506ff90 39 //
ryood 0:000c6506ff90 40
ryood 0:000c6506ff90 41 // param
ryood 3:19bb7c30c354 42 // channel: 1 or 2
ryood 0:000c6506ff90 43 // val: 0 .. 4095
ryood 3:19bb7c30c354 44 void InternalDacWrite(int ch, uint16_t val)
ryood 0:000c6506ff90 45 {
ryood 4:b242f4206894 46 //uint16_t v = val << 4;
ryood 4:b242f4206894 47 // avoid distortion of the built-in DAC
ryood 4:b242f4206894 48 uint16_t v = (val + 256) * 14;
ryood 0:000c6506ff90 49
ryood 3:19bb7c30c354 50 switch(ch) {
ryood 3:19bb7c30c354 51 case 1:
ryood 3:19bb7c30c354 52 Dac1.write_u16(v);
ryood 3:19bb7c30c354 53 break;
ryood 3:19bb7c30c354 54 case 2:
ryood 3:19bb7c30c354 55 Dac2.write_u16(v);
ryood 3:19bb7c30c354 56 break;
ryood 3:19bb7c30c354 57 }
ryood 0:000c6506ff90 58 }
ryood 0:000c6506ff90 59
ryood 0:000c6506ff90 60 void update()
ryood 0:000c6506ff90 61 {
ryood 0:000c6506ff90 62 #if (PIN_CHECK)
ryood 4:b242f4206894 63 CheckPin1.write(1);
ryood 0:000c6506ff90 64 #endif
ryood 0:000c6506ff90 65
ryood 0:000c6506ff90 66 phaccu = phaccu + tword_m;
ryood 2:4834d4483ea6 67 uint16_t idx = phaccu >> 17; // use upper 15 bits
ryood 0:000c6506ff90 68
ryood 3:19bb7c30c354 69 InternalDacWrite(1, sin_12bit_32k[idx]);
ryood 4:b242f4206894 70 //InternalDacWrite(2, sin_12bit_32k[idx]);
ryood 0:000c6506ff90 71
ryood 0:000c6506ff90 72 #if (PIN_CHECK)
ryood 4:b242f4206894 73 CheckPin1.write(0);
ryood 0:000c6506ff90 74 #endif
ryood 0:000c6506ff90 75 }
ryood 0:000c6506ff90 76
ryood 0:000c6506ff90 77 //-------------------------------------------------------------------------------------------------
ryood 0:000c6506ff90 78 // Main routine
ryood 0:000c6506ff90 79 //
ryood 0:000c6506ff90 80
ryood 0:000c6506ff90 81 int main()
ryood 0:000c6506ff90 82 {
ryood 0:000c6506ff90 83 tword_m = pow(2.0, 32) * drate / refclk; // calculate DDS tuning word;
ryood 0:000c6506ff90 84
ryood 4:b242f4206894 85 // 1.0s / 1.0us = 1000000.0
ryood 0:000c6506ff90 86 float interruptPeriodUs = 1000000.0 / refclk;
ryood 0:000c6506ff90 87 ticker.attach_us(&update, interruptPeriodUs);
ryood 0:000c6506ff90 88
ryood 0:000c6506ff90 89 while (1) {
ryood 4:b242f4206894 90 #if (PIN_CHECK)
ryood 4:b242f4206894 91 CheckPin2.write(1);
ryood 4:b242f4206894 92 wait_us(1);
ryood 4:b242f4206894 93 CheckPin2.write(0);
ryood 4:b242f4206894 94 wait_us(1);
ryood 4:b242f4206894 95 #endif
ryood 0:000c6506ff90 96 }
ryood 0:000c6506ff90 97 }
ryood 0:000c6506ff90 98