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Generating Sine Wave
- Thread starter MCU88
- Start date
I have never done anything like that before. Got any pointers on doing this in the C language?
Nope, I'm only starting (at age 65!) to learn C, and I'm not that far enough along in the book. Haven't got there yet.
Surely, though, there must be an easy way to do that; it can't be all that different from defining character strings in program memory, or any other table of constant data. I imagine your compiler user's manual tells how, somewhere.
I know enough about C to get most straightforward tasks accomplished. I probably know half of it. Lots of flight hours too. I used to program in BASIC, but I would never go back after using C. But, either way it eventually ends up in RAM. So I hardcode an table in program memory and load (n) contents into RAM at startup. This is I assume what is being suggested?
It may be that C is using program memory too. In program memory, you offset the program counter to the location in the table you want (i.e., calculate), and it returns that value. If you look at the disassembly of an assembly program you will see the table listed as many lines of program memory with some sort of return. If you use the DT directive (I believe that is appropriate for the 628A), the instruction on each line will be retlw.
I have never attempted to do a look-up table using RAM. If I were made to do that, I would use the indirect FSR and increment it. That is, treat the FSR analogously to the PC.
If you can get a disassembly listing of a C program in which you used a table, you should be able to tell whether program memory or general purpose RAM was used.
John
I have never attempted to do a look-up table using RAM. If I were made to do that, I would use the indirect FSR and increment it. That is, treat the FSR analogously to the PC.
If you can get a disassembly listing of a C program in which you used a table, you should be able to tell whether program memory or general purpose RAM was used.
John
Arh! I get it....
But your working variables are in RAM, and the data goes from program memory to RAM then to port right?
Here's an example of the code for a sine wave generator I made (before I could afford to buy a proper audio generator). It ran on a dsPIC30F3012, and drove an LTC8043 12-bit DAC. It's in ASM30, so have fun:
Code:
;******************************************************************************
;
; Filename: dsPICDDS.s
; Date: Monday, January 02, 2006
;
; NOTES: 48-bit DDS Prototype
;
;
;******************************************************************************
.equ __30F3012, 1
.include "p30f3012.inc"
;..............................................................................
;Configuration bits:
;..............................................................................
config __FOSC, CSW_FSCM_OFF & HS2_PLL16
config __FWDT, WDT_OFF
config __FBORPOR, PBOR_ON & BORV_27 & PWRT_16 & MCLR_EN
config __FGS, CODE_PROT_OFF
;..............................................................................
;Program Specific Constants (literals used in code)
;..............................................................................
; .equ Abcde, 1234 ; ....
;..............................................................................
;Global Declarations:
;..............................................................................
.global __reset
.global __T2Interrupt
;..............................................................................
;Uninitialized variables in Near data memory (Lower 8Kb of RAM)
;..............................................................................
.bss
PhaseIncr: .space 6 ; 48-bit phase increment register
Dummy: .space 2 ; temporary for watch window, to make PhaseAccum 64 bits
PhaseAccum: .space 6 ; 48-bit phase accumulator
DACValue: .space 2 ; DAC load value
;..............................................................................
;Code Section in Program Memory
;..............................................................................
.text ; Start of Code section
__reset:
mov #__SP_init, W15 ; Initalize the Stack Pointer
mov #__SPLIM_init, W0 ; Initialize the Stack Pointer Limit Register
mov W0, SPLIM
nop ; Add NOP to follow SPLIM initialization
rcall Initialize ; Set up ports, peripherals and modes, and clear regs
;
; load frequency for debug into PhaseIncr
;
; 60 Hz = 000D 1B71 758E
; 100 Hz = 0015 D867 C3EC
; 1000 Hz = 00DA 740D A740
;
; mov #0x00DA, w0
; mov w0, PhaseIncr+4
; mov #0x740D, w0
; mov w0, PhaseIncr+2
; mov #0xA740, w0
; mov w0, PhaseIncr
mov #0x2000, w0 ; 37.5 KHz
mov w0, PhaseIncr+4
mov #0x0200, w0
mov w0, PhaseIncr+2
mov #0x0000, w0
mov w0, PhaseIncr
clr PhaseAccum
clr PhaseAccum+2
clr PhaseAccum+4
MainLoop:
bset LATC, #14 ; select tens digit
mov #363, w0 ; wait 100 us
0:
dec w0, w0
bra nz, 0b
mov PORTB, w1 ; read digit
and #0x000F, w1 ; mask off everything but digit
mov #10, w0
mul.uu w0, w1, w2 ; multiply digit by 10 (result is in w2)
bclr LATC, #14 ; unselect tens digit
bset LATC, #13 ; select ones digit
mov #363, w0 ; wait 100 us
0:
dec w0, w0
bra nz, 0b
mov PORTB, w1 ; read digit
bclr LATC, #13 ; unselect ones digit
and #0x000F, w1 ; mask off everything but digit
add w1, w2, w2 ; finished number is in w2
mov #6, w0
mul.uu w0, w2, w2 ; multiply number by 6 (result is in w2)
mov #psvoffset(FreqTab), w1 ; get address of frequency table into w1
add w1, w2, w2 ; add offset to table base address
mov [w2++], w0 ; get MS word of table entry into w0
mov w0, PhaseIncr+4 ; put in phase increment register
mov [w2++], w0 ; get middle word of table entry into w0
mov w0, PhaseIncr+2 ; put in phase increment register
mov [w2], w0 ; get LS word of table entry into w0
mov w0, PhaseIncr ; put in phase increment register
mov #36300, w0 ; wait 10 ms
0:
dec w0, w0
bra nz, 0b
goto MainLoop
Initialize:
;
; Set up port latches and port direction registers
;
clr LATB ; make all pins outputs except RB0-RB3, set to all zeroes
clr LATC
clr LATD
mov #0x0F, w0
mov w0, TRISB ; set RB0-RB3 as inputs
mov w0, ADPCFG ; and make them digital
clr TRISC
clr TRISD
bset CORCON, #PSV ; enable PSV operation in CORCON
nop
nop
mov #psvpage(SineTab), w0 ; get upper address of sine table in program memory
mov w0, PSVPAG ; load upper address into PSVPAG
;
; Set up DSP core
;
bset CORCON, #SATA ; Enable accumulator A saturation
bset CORCON, #SATB ; Enable accumulator B saturation
bset CORCON, #ACCSAT ; Enable supersaturation
bclr CORCON, #IF ; Enable fractional mode for DSP multiplies
;
; Clear all working registers
;
clr w0
mov w0, w14
repeat #12
mov w0, [++w14]
clr w14
;
; Set up SPI
;
mov #0x0000, w0 ; SPI disabled, set to run in IDLE mode
mov w0, SPI1STAT
mov #0x053E, w0 ; FRMEN=SPIFSD=DISSDO=SMP=SSEN=CKP=0, MODE16=CKE=MSTEN=1, SPRE=111, PPRE=10
mov w0, SPI1CON
nop
bset SPI1STAT, #SPIEN ; turn on SPI
;
; Set up Timer 2 and OC2 to generate DAC load pulse on pin 15
;
clr OC2CON ; turn off OC2 module
bclr IEC0, #T2IE ; disable Timer 2 interrupts
mov #0x004D, w0 ; set duty cycle to 78 clock periods
mov w0, OC2RS ; write to duty cycle buffer register
mov w0, OC2R ; and value register
mov #0x0006, w0 ; set OC2 mode to PWM w/o fault detection
mov w0, OC2CON
mov #0x004F, w0 ; initialize PR2 for 80 clock periods (300kHz @ 96MHz Fosc)
mov w0, PR2
bset IPC0, #T2IP0 ; setup Timer 2 interrupt for
bclr IPC0, #T2IP1 ; level 1 priority
bclr IPC0, #T2IP2
bclr IFS0, #T2IF ; clear Timer 2 interrupt flag
bset IEC0, #T2IE ; enable Timer 2 interrupts
bset T2CON, #TON ; start Timer 2
return
__T2Interrupt:
bset LATD, #0 ; set pin 10 for timing measurement
bclr IFS0, #T2IF ; Reset Timer 2 interrupt flag
push.s ; save w0-w3
mov DACValue, w0 ; get DAC value from last session and
mov w0, SPI1BUF ; put in SPI transmit buffer for sending to LTC8043
mov PhaseAccum, w0 ; add 48-bit phase increment to phase accumulator
mov PhaseIncr, w1
add w1, w0, w0
mov w0, PhaseAccum
mov PhaseAccum+2, w0
mov PhaseIncr+2, w1
addc w1, w0, w0
mov w0, PhaseAccum+2
mov PhaseAccum+4, w0
mov PhaseIncr+4, w1
addc w1, w0, w0
mov w0, PhaseAccum+4
mov w0, w1 ; copy to w1
mov w1, w3 ; save a copy in w3
lsr w1, #5, w1 ; shift right with zero fill so that sine table offset is in w1<10:1>
bclr w1, #0 ; mask off LSB because each table entry is two bytes
sl w3, #10, w3 ; shift offset left 10 bits to get interpolation fraction
mov #psvoffset(SineTab), w2 ; get lower address of sine table into w2
add w1, w2, w2 ; add offset to table base address to get entry address in w2
mov [w2++], w0 ; get table entry into w0, advance w2 to next entry
mov [w2], w1 ; get next table entry into w1
sub w1, w0, w1 ; subtract this entry from next entry to get delta into w1
mul.us w3, w1, w2 ; multiply fraction (unsigned) by delta (signed), MS product word in w3
add w3, w0, w0 ; add interpolation result to table entry, sum in w0
lsr w0, #4, w0 ; shift right 4 bits for the 12-bit DAC
mov w0, DACValue ; and save for sending to DAC on next cycle
pop.s ; restore w0-w3
bclr LATD, #0 ; clear pin 10
RETFIE ; Return from ISR
SineTab:
.palign 2
.word 32767, 32969, 33170, 33371, 33572, 33773, 33974, 34175, 34375, 34576, 34777, 34978, 35178, 35379, 35579, 35779
.word 35979, 36179, 36379, 36579, 36779, 36978, 37177, 37377, 37576, 37774, 37973, 38171, 38370, 38568, 38765, 38963
.word 39160, 39357, 39554, 39751, 39947, 40143, 40339, 40534, 40729, 40924, 41119, 41313, 41507, 41701, 41894, 42087
.word 42280, 42472, 42664, 42855, 43046, 43237, 43427, 43617, 43807, 43996, 44184, 44373, 44561, 44748, 44935, 45121
.word 45307, 45493, 45678, 45862, 46046, 46230, 46413, 46596, 46778, 46959, 47140, 47320, 47500, 47680, 47858, 48037
.word 48214, 48391, 48568, 48744, 48919, 49093, 49267, 49441, 49614, 49786, 49957, 50128, 50298, 50468, 50637, 50805
.word 50972, 51139, 51305, 51471, 51636, 51800, 51963, 52126, 52287, 52448, 52609, 52769, 52927, 53086, 53243, 53399
.word 53555, 53710, 53865, 54018, 54171, 54323, 54474, 54624, 54773, 54922, 55069, 55216, 55362, 55508, 55652, 55795
.word 55938, 56080, 56221, 56361, 56500, 56638, 56775, 56912, 57047, 57182, 57315, 57448, 57580, 57711, 57841, 57969
.word 58098, 58225, 58351, 58476, 58600, 58723, 58845, 58967, 59087, 59206, 59325, 59442, 59558, 59673, 59788, 59901
.word 60013, 60124, 60234, 60344, 60452, 60559, 60665, 60770, 60874, 60976, 61078, 61179, 61279, 61377, 61475, 61571
.word 61666, 61761, 61854, 61946, 62037, 62127, 62215, 62303, 62389, 62475, 62559, 62642, 62724, 62805, 62885, 62964
.word 63041, 63118, 63193, 63267, 63340, 63412, 63482, 63552, 63620, 63687, 63753, 63818, 63882, 63944, 64005, 64066
.word 64125, 64182, 64239, 64294, 64349, 64402, 64453, 64504, 64553, 64602, 64649, 64695, 64739, 64783, 64825, 64866
.word 64906, 64944, 64982, 65018, 65053, 65087, 65119, 65151, 65181, 65210, 65237, 65264, 65289, 65313, 65336, 65357
.word 65378, 65397, 65415, 65431, 65447, 65461, 65474, 65486, 65496, 65505, 65513, 65520, 65526, 65530, 65533, 65535
.word 65535, 65535, 65533, 65530, 65526, 65520, 65513, 65505, 65496, 65486, 65474, 65461, 65447, 65431, 65415, 65397
.word 65378, 65357, 65336, 65313, 65289, 65264, 65237, 65210, 65181, 65151, 65119, 65087, 65053, 65018, 64982, 64944
.word 64906, 64866, 64825, 64783, 64739, 64695, 64649, 64602, 64553, 64504, 64453, 64402, 64349, 64294, 64239, 64182
.word 64125, 64066, 64005, 63944, 63882, 63818, 63753, 63687, 63620, 63552, 63482, 63412, 63340, 63267, 63193, 63118
.word 63041, 62964, 62885, 62805, 62724, 62642, 62559, 62475, 62389, 62303, 62215, 62127, 62037, 61946, 61854, 61761
.word 61666, 61571, 61475, 61377, 61279, 61179, 61078, 60976, 60874, 60770, 60665, 60559, 60452, 60344, 60234, 60124
.word 60013, 59901, 59788, 59673, 59558, 59442, 59325, 59206, 59087, 58967, 58845, 58723, 58600, 58476, 58351, 58225
.word 58098, 57969, 57841, 57711, 57580, 57448, 57315, 57182, 57047, 56912, 56775, 56638, 56500, 56361, 56221, 56080
.word 55938, 55795, 55652, 55508, 55362, 55216, 55069, 54922, 54773, 54624, 54474, 54323, 54171, 54018, 53865, 53710
.word 53555, 53399, 53243, 53086, 52927, 52769, 52609, 52448, 52287, 52126, 51963, 51800, 51636, 51471, 51305, 51139
.word 50972, 50805, 50637, 50468, 50298, 50128, 49957, 49786, 49614, 49441, 49267, 49093, 48919, 48744, 48568, 48391
.word 48214, 48037, 47858, 47680, 47500, 47320, 47140, 46959, 46778, 46596, 46413, 46230, 46046, 45862, 45678, 45493
.word 45307, 45121, 44935, 44748, 44561, 44373, 44184, 43996, 43807, 43617, 43427, 43237, 43046, 42855, 42664, 42472
.word 42280, 42087, 41894, 41701, 41507, 41313, 41119, 40924, 40729, 40534, 40339, 40143, 39947, 39751, 39554, 39357
.word 39160, 38963, 38765, 38568, 38370, 38171, 37973, 37774, 37576, 37377, 37177, 36978, 36779, 36579, 36379, 36179
.word 35979, 35779, 35579, 35379, 35178, 34978, 34777, 34576, 34375, 34175, 33974, 33773, 33572, 33371, 33170, 32969
.word 32767, 32566, 32365, 32164, 31963, 31762, 31561, 31360, 31160, 30959, 30758, 30557, 30357, 30156, 29956, 29756
.word 29556, 29356, 29156, 28956, 28756, 28557, 28358, 28158, 27959, 27761, 27562, 27364, 27165, 26967, 26770, 26572
.word 26375, 26178, 25981, 25784, 25588, 25392, 25196, 25001, 24806, 24611, 24416, 24222, 24028, 23834, 23641, 23448
.word 23255, 23063, 22871, 22680, 22489, 22298, 22108, 21918, 21728, 21539, 21351, 21162, 20974, 20787, 20600, 20414
.word 20228, 20042, 19857, 19673, 19489, 19305, 19122, 18939, 18757, 18576, 18395, 18215, 18035, 17855, 17677, 17498
.word 17321, 17144, 16967, 16791, 16616, 16442, 16268, 16094, 15921, 15749, 15578, 15407, 15237, 15067, 14898, 14730
.word 14563, 14396, 14230, 14064, 13899, 13735, 13572, 13409, 13248, 13086, 12926, 12766, 12608, 12449, 12292, 12136
.word 11980, 11825, 11670, 11517, 11364, 11212, 11061, 10911, 10762, 10613, 10466, 10319, 10173, 10027, 9883, 9740
.word 9597, 9455, 9314, 9174, 9035, 8897, 8760, 8623, 8488, 8353, 8220, 8087, 7955, 7824, 7694, 7566
.word 7437, 7310, 7184, 7059, 6935, 6812, 6690, 6568, 6448, 6329, 6210, 6093, 5977, 5862, 5747, 5634
.word 5522, 5411, 5301, 5191, 5083, 4976, 4870, 4765, 4661, 4559, 4457, 4356, 4256, 4158, 4060, 3964
.word 3869, 3774, 3681, 3589, 3498, 3408, 3320, 3232, 3146, 3060, 2976, 2893, 2811, 2730, 2650, 2571
.word 2494, 2417, 2342, 2268, 2195, 2123, 2053, 1983, 1915, 1848, 1782, 1717, 1653, 1591, 1530, 1469
.word 1410, 1353, 1296, 1241, 1186, 1133, 1082, 1031, 982, 933, 886, 840, 796, 752, 710, 669
.word 629, 591, 553, 517, 482, 448, 416, 384, 354, 325, 298, 271, 246, 222, 199, 178
.word 157, 138, 120, 104, 88, 74, 61, 49, 39, 30, 22, 15, 9, 5, 2, 0
.word 0, 0, 2, 5, 9, 15, 22, 30, 39, 49, 61, 74, 88, 104, 120, 138
.word 157, 178, 199, 222, 246, 271, 298, 325, 354, 384, 416, 448, 482, 517, 553, 591
.word 629, 669, 710, 752, 796, 840, 886, 933, 982, 1031, 1082, 1133, 1186, 1241, 1296, 1353
.word 1410, 1469, 1530, 1591, 1653, 1717, 1782, 1848, 1915, 1983, 2053, 2123, 2195, 2268, 2342, 2417
.word 2494, 2571, 2650, 2730, 2811, 2893, 2976, 3060, 3146, 3232, 3320, 3408, 3498, 3589, 3681, 3774
.word 3869, 3964, 4060, 4158, 4256, 4356, 4457, 4559, 4661, 4765, 4870, 4976, 5083, 5191, 5301, 5411
.word 5522, 5634, 5747, 5862, 5977, 6093, 6210, 6329, 6448, 6568, 6690, 6812, 6935, 7059, 7184, 7310
.word 7437, 7566, 7694, 7824, 7955, 8087, 8220, 8353, 8488, 8623, 8760, 8897, 9035, 9174, 9314, 9455
.word 9597, 9740, 9883, 10027, 10173, 10319, 10466, 10613, 10762, 10911, 11061, 11212, 11364, 11517, 11670, 11825
.word 11980, 12136, 12292, 12449, 12608, 12766, 12926, 13086, 13248, 13409, 13572, 13735, 13899, 14064, 14230, 14396
.word 14563, 14730, 14898, 15067, 15237, 15407, 15578, 15749, 15921, 16094, 16268, 16442, 16616, 16791, 16967, 17144
.word 17321, 17498, 17677, 17855, 18035, 18215, 18395, 18576, 18757, 18939, 19122, 19305, 19489, 19673, 19857, 20042
.word 20228, 20414, 20600, 20787, 20974, 21162, 21351, 21539, 21728, 21918, 22108, 22298, 22489, 22680, 22871, 23063
.word 23255, 23448, 23641, 23834, 24028, 24222, 24416, 24611, 24806, 25001, 25196, 25392, 25588, 25784, 25981, 26178
.word 26375, 26572, 26770, 26967, 27165, 27364, 27562, 27761, 27959, 28158, 28358, 28557, 28756, 28956, 29156, 29356
.word 29556, 29756, 29956, 30156, 30357, 30557, 30758, 30959, 31160, 31360, 31561, 31762, 31963, 32164, 32365, 32566
.word 32767 ; duplicates first word in table, to take care of wraparound
FreqTab:
.palign 2
.word 0, 1431, 42976
.word 0, 1802, 22794
.word 0, 2269, 1407
.word 0, 2856, 34655
.word 0, 3596, 10268
.word 0, 4527, 19204
.word 0, 5699, 34357
.word 0, 7175, 18083
.word 0, 9033, 8991
.word 0, 11372, 3012
.word 0, 14316, 36546
.word 0, 18023, 31341
.word 0, 22690, 14074
.word 0, 28565, 18872
.word 0, 35961, 37153
.word 0, 45272, 60977
.word 0, 56995, 15898
.word 1, 6216, 49758
.word 1, 24795, 24378
.word 1, 48184, 30125
.word 2, 12093, 37783
.word 2, 49162, 51274
.word 3, 30294, 9675
.word 4, 23508, 57649
.word 5, 31935, 43853
.word 6, 59513, 19947
.word 8, 45664, 27914
.word 10, 62167, 38832
.word 13, 51345, 47179
.word 17, 23092, 39112
.word 21, 55399, 50156
.word 27, 32875, 53996
.word 34, 40797, 31222
.word 43, 38480, 52204
.word 54, 57212, 45320
.word 69, 5309, 2868
.word 86, 63428, 17002
.word 109, 31851, 60643
.word 137, 54705, 13044
.word 173, 34317, 63445
.word 218, 29709, 42816
.word 275, 1078, 15676
.word 346, 14758, 50085
.word 435, 57127, 63293
.word 548, 47838, 59987
.word 690, 53090, 28681
.word 869, 44458, 38951
.word 1094, 56375, 16606
.word 1378, 22763, 64909
.word 1735, 15499, 44630
.word 2184, 34952, 34952
.word 2750, 10782, 25688
.word 3462, 16515, 42103
.word 4358, 46991, 43106
.word 5487, 19637, 10048
.word 6908, 6616, 24673
.word 9, 43342, 61740
.word 10, 60467, 57846
.word 13, 7025, 30094
.word 13, 27757, 17454
.word 0, 14316, 36546
.word 0, 20246, 43909
.word 0, 28633, 7556
.word 0, 40493, 22282
.word 0, 57266, 15113
.word 1, 15450, 44564
.word 1, 48996, 30226
.word 2, 30901, 23592
.word 3, 32456, 60453
.word 4, 61802, 47185
.word 6, 64913, 55371
.word 9, 58069, 28835
.word 13, 64291, 45207
.word 19, 50602, 57671
.word 27, 63047, 24879
.word 39, 35669, 49806
.word 55, 60558, 49758
.word 79, 5803, 34076
.word 111, 55581, 33980
.word 158, 11607, 2616
.word 223, 45627, 2425
.word 316, 23214, 5232
.word 447, 25718, 4851
.word 632, 46428, 10464
.word 894, 51436, 9702
.word 1265, 27320, 20928
.word 1789, 37336, 19405
.word 2530, 54640, 41857
.word 3579, 9136, 38811
.word 5061, 43745, 18178
.word 7158, 18273, 12086
.word 57, 10025, 32060
.word 64, 9964, 38052
.word 72, 539, 60468
.word 76, 19010, 7175
.word 85, 41465, 16978
.word 96, 7829, 24082
.word 107, 58356, 49574
.word 114, 20050, 64121
.word 2097, 9961, 30932
.end ; End of program code in this fileYou are clearly an assembly programmer John. I am not
Yeah real nice mate. You are clearly an hotshot assembly programmer. Wish I could read it and understand it.
Look up the Cordic algorithm. Beautiful Sine/Cosine outputs using only integer math (shifts and adds).
It can be executed once at start-up to fill a table, or avoid using a table by generating the next value as needed on the fly.
I first coded the Cordic on a PDP-8 mini-computer...
It can be executed once at start-up to fill a table, or avoid using a table by generating the next value as needed on the fly.
I first coded the Cordic on a PDP-8 mini-computer...
Last edited:
Not sure I understand completely what you mean. Let's say you have a RAM register labeled "Vt" . At each time increment, you would load that register with the binary value for voltage based on the look-up table. You would then go to an DAC to get the proper voltage. That is over simplified, as the sine wave generators I have seen used PWM, so the return value might be a PWM setting.
In any event, you have only used just one RAM location.
Edit: Corrected ADC to DAC. I give dyslexia a bad name. Thanks, Papabravo.
Last edited:
There are also PIC devices with an NCO peripheral. That's a numerically controlled oscillator. It's used in the 10M Tayloe Simple Transmitter.
http://www.qrpkits.com/files/TST_v22_110512.pdf
http://www.qrpkits.com/files/TST_v22_110512.pdf
I think you mean a DAC. That's what you use for an analog output.
Yes this is all that I am saying. But would it not be faster if I loaded the whole table into RAM to begin with? It seems like one less step in the process. Table abc in program memory. Fetch (n) from abc function. Write to port.
Thanks John. I will get back to you on this.
I am using mikroC. The user's guide has nothing that I have come across with regards to this. I will check again using the suggested search words that you have mentioned.
I don't doubt that it can be done. I just don't know how to do it. I now understand the schema of what you are saying, and I appreciate your help. Thank you.
But I am wondering if it would be faster to have the whole table in an array in RAM? I have never done anything like this before, so I am uncertain.
Attachments
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| V | generating sine wave | Microcontrollers | 6 | |
| P | Generating High Resolution Sine wave Using PIC's PWM | Microcontrollers | 4 | |
| P | Generating 10kHz sine wave signal by PIC and DAC IC | Microcontrollers | 17 | |
| E | generating sine wave | Analog & Mixed-Signal Design | 24 |
