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starfire151
Joined: 01 Apr 2007
Posts: 201
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| PWM with PIC16LF15325 |
 Posted: Thu Apr 03, 2025 9:42 am |
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I've been trying to get the PWM output to work with a PIC16LF15325 but have been unsuccessful.
From the header support file:
#pin_select PWM3=PIN_C0
#use pwm(output=PIN_C0, frequency=15625, bits=10)
From the main program:
setup_pwm3(CCP_PWM);
pwm_set_frequency(10000); // set frequency
pwm_set_duty_percent(200); // 20% duty cycle
pwm_on();
I have tried using PIN_A4 and PIN_C0 as outputs but have not been able to see the PWM output with a scope.
Is there something I'm not setting up correctly?
Thanks. |
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temtronic
Joined: 01 Jul 2010
Posts: 9449
Location: Greensville,Ontario
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| Posted: Thu Apr 03, 2025 3:51 pm |
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It seems simple, so post your program so others can copy/paste/compile/test !
'bits and pieces' don't show us the whole story....
also, does the PIC run a '1Hz LED program ' ?? |
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starfire151
Joined: 01 Apr 2007
Posts: 201
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| Posted: Thu Apr 03, 2025 4:15 pm |
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.h file:
| Code: |
#include <16LF15325.h>
#device adc=10 // 10-bit ADC => 1024 steps
#device *=16
#define clk_freq 16M
#use delay(internal=clk_freq)
#pin_select PWM3=PIN_C0
#use pwm(output=PIN_C0, frequency=15625, bits=10)
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.c file:
| Code: |
#include <pwm_16LF15325_test.h>
void main()
{
setup_timer_2(T2_DIV_BY_1, 127, 1);
setup_pwm3(CCP_PWM);
pwm_set_frequency(10000); // set frequency
pwm_set_duty_percent(200); // 20% duty cycle
while(TRUE)
{
}
}
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I also tried to use the wizard to generate a baseline program with the pwm but it was not successful, either.
Thanks for looking at it... |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19766
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| Posted: Fri Apr 04, 2025 3:28 am |
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You are 'overpecifying things'. Normally the compiler will accept this, but
I suspect this is resulting in things not working:
| Code: |
#include <16LF15325.h>
#device adc=10 // 10-bit ADC => 1024 steps
#device *=16
#define clk_freq 16M
#use delay(internal=clk_freq)
#pin_select PWM3=PIN_C0
#use pwm(PWM3, frequency=15625)
//You have already specified where PWM3 is to go.
//Also specifying 'bits', implies that the frequency may be adjusted if
//needed to give this. Just specify the frequency and the compiler will
//tell you how many bits it can achieve.
void main()
{
setup_timer_2(T2_DIV_BY_1, 127, 1);
//setup_pwm3(CCP_PWM);
//You have already setup pwm3. Don't do it again. This setup is almost
//certainly what is stopping the PWM. This is a dedicated PWM, _not_
//A CCP. CCP_PWM, is not an acceptable setting for the PWM module
//If you look at the header file, this is not listed as a parameter for
//this PWM.... You are using a command for the CCP peripheral
//on the PWM. Result disaster.......
//It'll actually turn off the enable bit for the PWM.....
//You must _never_ use command words for the wrong peripheral.
//This is exactly like putting diesel in a petrol car......
pwm_set_frequency(10000); // set frequency
pwm_set_duty_percent(200); // 20% duty cycle
while(TRUE)
{
}
}
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starfire151
Joined: 01 Apr 2007
Posts: 201
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| PWM with PIC16LF15325 |
| Posted: Fri Apr 04, 2025 7:28 am |
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Thanks for responding.
I implemented the changes you suggested but there is still no output.
I added the pwm_on(); after setting the duty percent but still no output. The scope shows flatline.
Is there something unusual about setting up the PWM on the 16LF15325? I have used this same method on the 16LF1825 with success, even though the output was not mapped.
When the program compiled, it did specify that the output was 10-bits, as you said.
BTW, I have been able to successfully get a version of the program with this processor to output a 1 second toggle to an LED using a timer interrupt. |
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starfire151
Joined: 01 Apr 2007
Posts: 201
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| Posted: Sat Apr 05, 2025 6:02 am |
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Does anyone have the PIC16LF15325 working with a PWM output?
Any output pin, any frequency, any duty cycle?
I'm having start-up issues with this simple program:
| Code: |
#include <16LF15325.h>
#device adc=10
#device *=16
#define clk_freq 16M
#use delay(internal=clk_freq)
#pin_select PWM3=PIN_C0
#use pwm(PWM3, frequency=15625)
void main()
{
setup_timer_2(T2_DIV_BY_1, 127, 1);
pwm_set_frequency(10000); // set frequency
pwm_set_duty_percent(200); // 20% duty cycle
pwm_on();
while(TRUE)
{
}
}
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temtronic
Joined: 01 Jul 2010
Posts: 9449
Location: Greensville,Ontario
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| Posted: Sat Apr 05, 2025 6:07 am |
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Hmm, maybe you damaged the PIC ?
Can you flash an LED on the I/O pin ?
Id there's another internal peripheral, can you confirm it works ? |
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starfire151
Joined: 01 Apr 2007
Posts: 201
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| Posted: Sat Apr 05, 2025 8:28 am |
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Thanks for responding...
Here's my modified code:
| Code: |
#include <16LF15325.h>
#device adc=10 // 10-bit ADC => 1024 steps
#device *=16
#define clk_freq 16M
#use delay(internal=clk_freq)
#pin_select PWM3=PIN_C0
#use pwm(PWM3, frequency=15625) // compiler states PWM resolution = 10 bits
void main()
{
setup_timer_2(T2_DIV_BY_1, 127, 1);
pwm_set_frequency(10000); // set frequency
pwm_set_duty_percent(200); // 20% duty cycle
pwm_on();
while(TRUE)
{
output_high(PIN_C2);
delay_ms(1000);
output_low(PIN_C2);
delay_ms(1000);
}
}
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This is with a new 16LF15325 device. It toggles the LED correctly.
It's looking like there's something fundamental wrong. I have nothing else connected to the PIC. |
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temtronic
Joined: 01 Jul 2010
Posts: 9449
Location: Greensville,Ontario
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| Posted: Sat Apr 05, 2025 12:34 pm |
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sounds like it's time to post the listing ( program.lst) file.
maybe someone can see what's wrong with the actual code ? |
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starfire151
Joined: 01 Apr 2007
Posts: 201
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| Posted: Sat Apr 05, 2025 1:25 pm |
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OK. Here's the listing file.... sorry it's so long...
CCS PCM C Compiler, Version 5.071, 33568 05-Apr-25 08:24
Filename: D:\projects\PicC\projects\4D0185_pwm_hi-v\pwm_16LF15325_test.lst
ROM used: 443 words (5%)
Largest free fragment is 2048
RAM used: 6 (1%) at main() level
37 (4%) worst case
Stack used: 1 locations
Stack size: 16
*
0000: MOVLP 00
0001: GOTO 15A
0002: NOP
.................... #include <16LF15325.h>
.................... //////////// Standard Header file for the PIC16LF15325 device ////////////////
.................... ///////////////////////////////////////////////////////////////////////////
.................... //// (C) Copyright 1996, 2014 Custom Computer Services ////
.................... //// This source code may only be used by licensed users of the CCS C ////
.................... //// compiler. This source code may only be distributed to other ////
.................... //// licensed users of the CCS C compiler. No other use, reproduction ////
.................... //// or distribution is permitted without written permission. ////
.................... //// Derivative programs created using this software in object code ////
.................... //// form are not restricted in any way. ////
.................... ///////////////////////////////////////////////////////////////////////////
.................... #device PIC16LF15325
0003: BTFSC 03.1
0004: GOTO 009
0005: MOVLW 20
0006: MOVWF 05
0007: MOVLW 14
0008: MOVWF 04
0009: CLRF 77
000A: CLRF 78
000B: CLRF 79
000C: CLRF 7A
000D: CLRF 34
000E: CLRF 35
000F: CLRF 36
0010: CLRF 37
0011: MOVF 30,W
0012: IORWF 2F,W
0013: IORWF 2E,W
0014: IORWF 2D,W
0015: BTFSC 03.2
0016: GOTO 047
0017: MOVLW 20
0018: MOVWF 38
0019: BCF 03.0
001A: RLF 29,F
001B: RLF 2A,F
001C: RLF 2B,F
001D: RLF 2C,F
001E: RLF 34,F
001F: RLF 35,F
0020: RLF 36,F
0021: RLF 37,F
0022: MOVF 30,W
0023: SUBWF 37,W
0024: BTFSS 03.2
0025: GOTO 030
0026: MOVF 2F,W
0027: SUBWF 36,W
0028: BTFSS 03.2
0029: GOTO 030
002A: MOVF 2E,W
002B: SUBWF 35,W
002C: BTFSS 03.2
002D: GOTO 030
002E: MOVF 2D,W
002F: SUBWF 34,W
0030: BTFSS 03.0
0031: GOTO 041
0032: MOVF 2D,W
0033: SUBWF 34,F
0034: MOVF 2E,W
0035: BTFSS 03.0
0036: INCFSZ 2E,W
0037: SUBWF 35,F
0038: MOVF 2F,W
0039: BTFSS 03.0
003A: INCFSZ 2F,W
003B: SUBWF 36,F
003C: MOVF 30,W
003D: BTFSS 03.0
003E: INCFSZ 30,W
003F: SUBWF 37,F
0040: BSF 03.0
0041: RLF 77,F
0042: RLF 78,F
0043: RLF 79,F
0044: RLF 7A,F
0045: DECFSZ 38,F
0046: GOTO 019
0047: MOVF 34,W
0048: MOVWF 00
0049: MOVF 35,W
004A: MOVWI W,[FSR0+01]
004B: MOVF 36,W
004C: MOVWI W,[FSR0+02]
004D: MOVF 37,W
004E: MOVWI W,[FSR0+03]
004F: RETURN
*
0103: MOVLW 20
0104: MOVWF 38
0105: CLRF 34
0106: CLRF 35
0107: CLRF 36
0108: CLRF 37
0109: MOVF 2B,W
010A: MOVWF 7A
010B: MOVF 2A,W
010C: MOVWF 79
010D: MOVF 29,W
010E: MOVWF 78
010F: MOVF 28,W
0110: MOVWF 77
0111: BCF 03.0
0112: BTFSS 77.0
0113: GOTO 122
0114: MOVF 2C,W
0115: ADDWF 34,F
0116: MOVF 2D,W
0117: BTFSC 03.0
0118: INCFSZ 2D,W
0119: ADDWF 35,F
011A: MOVF 2E,W
011B: BTFSC 03.0
011C: INCFSZ 2E,W
011D: ADDWF 36,F
011E: MOVF 2F,W
011F: BTFSC 03.0
0120: INCFSZ 2F,W
0121: ADDWF 37,F
0122: RRF 37,F
0123: RRF 36,F
0124: RRF 35,F
0125: RRF 34,F
0126: RRF 7A,F
0127: RRF 79,F
0128: RRF 78,F
0129: RRF 77,F
012A: DECFSZ 38,F
012B: GOTO 111
....................
.................... #list
....................
....................
.................... #device adc=10 // 10-bit ADC => 1024 steps
.................... #device *=16
....................
.................... #define clk_freq 16M
.................... #use delay(internal=clk_freq)
*
0144: MOVLW 20
0145: MOVWF 05
0146: MOVLW 02
0147: MOVWF 04
0148: MOVF 00,W
0149: BTFSC 03.2
014A: GOTO 159
014B: MOVLW 05
014C: MOVWF 78
014D: CLRF 77
014E: DECFSZ 77,F
014F: GOTO 14E
0150: DECFSZ 78,F
0151: GOTO 14D
0152: MOVLW 2E
0153: MOVWF 77
0154: DECFSZ 77,F
0155: GOTO 154
0156: GOTO 157
0157: DECFSZ 00,F
0158: GOTO 14B
0159: RETURN
....................
.................... #pin_select PWM3=PIN_C0
.................... #use pwm(PWM3, frequency=15625) // compiler states PWM resolution = 10 bits
*
0050: BCF 03.1
0051: MOVF 28,W
0052: MOVWF 2C
0053: MOVF 27,W
0054: MOVWF 2B
0055: MOVF 26,W
0056: MOVWF 2A
0057: MOVF 25,W
0058: MOVWF 29
0059: MOVF 24,W
005A: MOVWF 30
005B: MOVF 23,W
005C: MOVWF 2F
005D: MOVF 22,W
005E: MOVWF 2E
005F: MOVF 21,W
0060: MOVWF 2D
0061: CALL 003
0062: MOVF 7A,W
0063: BTFSS 03.2
0064: GOTO 06B
0065: MOVF 79,W
0066: BTFSS 03.2
0067: GOTO 06B
0068: MOVF 78,W
0069: BTFSC 03.2
006A: GOTO 0BE
006B: RRF 7A,F
006C: RRF 79,F
006D: RRF 78,F
006E: RRF 77,F
006F: MOVLW 7F
0070: ANDWF 7A,F
0071: MOVF 7A,W
0072: BTFSS 03.2
0073: GOTO 07A
0074: MOVF 79,W
0075: BTFSS 03.2
0076: GOTO 07A
0077: MOVF 78,W
0078: BTFSC 03.2
0079: GOTO 0C3
007A: RRF 79,F
007B: RRF 78,F
007C: RRF 77,F
007D: MOVLW 7F
007E: ANDWF 79,F
007F: MOVF 79,W
0080: BTFSS 03.2
0081: GOTO 085
0082: MOVF 78,W
0083: BTFSC 03.2
0084: GOTO 0C8
0085: RRF 79,F
0086: RRF 78,F
0087: RRF 77,F
0088: MOVLW 7F
0089: ANDWF 79,F
008A: MOVF 79,W
008B: BTFSS 03.2
008C: GOTO 090
008D: MOVF 78,W
008E: BTFSC 03.2
008F: GOTO 0CD
0090: RRF 79,F
0091: RRF 78,F
0092: RRF 77,F
0093: MOVLW 7F
0094: ANDWF 79,F
0095: MOVF 79,W
0096: BTFSS 03.2
0097: GOTO 09B
0098: MOVF 78,W
0099: BTFSC 03.2
009A: GOTO 0D2
009B: RRF 79,F
009C: RRF 78,F
009D: RRF 77,F
009E: MOVLW 7F
009F: ANDWF 79,F
00A0: MOVF 79,W
00A1: BTFSS 03.2
00A2: GOTO 0A6
00A3: MOVF 78,W
00A4: BTFSC 03.2
00A5: GOTO 0D7
00A6: RRF 79,F
00A7: RRF 78,F
00A8: RRF 77,F
00A9: MOVLW 7F
00AA: ANDWF 79,F
00AB: MOVF 79,W
00AC: BTFSS 03.2
00AD: GOTO 0B1
00AE: MOVF 78,W
00AF: BTFSC 03.2
00B0: GOTO 0DC
00B1: RRF 79,F
00B2: RRF 78,F
00B3: RRF 77,F
00B4: MOVLW 7F
00B5: ANDWF 79,F
00B6: MOVF 79,W
00B7: BTFSS 03.2
00B8: GOTO 0BC
00B9: MOVF 78,W
00BA: BTFSC 03.2
00BB: GOTO 0E1
00BC: CLRF 77
00BD: GOTO 0E1
00BE: MOVLW 80
00BF: MOVLB 05
00C0: MOVWF 0E
00C1: GOTO 0E4
00C2: MOVLB 00
00C3: MOVLW 90
00C4: MOVLB 05
00C5: MOVWF 0E
00C6: GOTO 0E4
00C7: MOVLB 00
00C8: MOVLW A0
00C9: MOVLB 05
00CA: MOVWF 0E
00CB: GOTO 0E4
00CC: MOVLB 00
00CD: MOVLW B0
00CE: MOVLB 05
00CF: MOVWF 0E
00D0: GOTO 0E4
00D1: MOVLB 00
00D2: MOVLW C0
00D3: MOVLB 05
00D4: MOVWF 0E
00D5: GOTO 0E4
00D6: MOVLB 00
00D7: MOVLW D0
00D8: MOVLB 05
00D9: MOVWF 0E
00DA: GOTO 0E4
00DB: MOVLB 00
00DC: MOVLW E0
00DD: MOVLB 05
00DE: MOVWF 0E
00DF: GOTO 0E4
00E0: MOVLB 00
00E1: MOVLW F0
00E2: MOVLB 05
00E3: MOVWF 0E
00E4: DECF 77,F
00E5: MOVF 77,W
00E6: MOVWF 0D
00E7: MOVLP 00
00E8: MOVLB 00
00E9: GOTO 1A0 (RETURN)
00EA: MOVLB 05
00EB: MOVF 0D,W
00EC: MOVLB 00
00ED: MOVWF 24
00EE: CLRF 25
00EF: INCF 24,F
00F0: BTFSC 03.2
00F1: INCF 25,F
00F2: BCF 03.0
00F3: RLF 24,F
00F4: RLF 25,F
00F5: RLF 24,F
00F6: RLF 25,F
00F7: CLRF 2B
00F8: CLRF 2A
00F9: MOVF 25,W
00FA: MOVWF 29
00FB: MOVF 24,W
00FC: MOVWF 28
00FD: CLRF 2F
00FE: CLRF 2E
00FF: MOVF 22,W
0100: MOVWF 2D
0101: MOVF 21,W
0102: MOVWF 2C
*
012C: BCF 03.1
012D: MOVF 7A,W
012E: MOVWF 2C
012F: MOVF 79,W
0130: MOVWF 2B
0131: MOVF 78,W
0132: MOVWF 2A
0133: MOVF 77,W
0134: MOVWF 29
0135: CLRF 30
0136: CLRF 2F
0137: MOVLW 03
0138: MOVWF 2E
0139: MOVLW E8
013A: MOVWF 2D
013B: CALL 003
013C: MOVF 78,W
013D: MOVLB 06
013E: MOVWF 0D
013F: MOVF 77,W
0140: MOVWF 0C
0141: MOVLP 00
0142: MOVLB 00
0143: GOTO 1A4 (RETURN)
....................
....................
.................... void main()
*
015A: MOVLW 55
015B: MOVLB 3D
015C: MOVWF 0F
015D: MOVLW AA
015E: MOVWF 0F
015F: BCF 0F.0
0160: MOVLW 0B
0161: MOVLB 3E
0162: MOVWF 20
0163: MOVLW 55
0164: MOVLB 3D
0165: MOVWF 0F
0166: MOVLW AA
0167: MOVWF 0F
0168: BSF 0F.0
0169: MOVLB 11
016A: CLRF 12
016B: CLRF 0F
016C: CLRF 11
016D: MOVLW 05
016E: MOVWF 13
016F: MOVLW 60
0170: MOVWF 0D
0171: MOVLW FF
0172: MOVLB 05
0173: MOVWF 0D
0174: MOVLW 01
0175: MOVWF 10
0176: MOVLW 80
0177: MOVWF 0E
0178: MOVLW 02
0179: MOVLB 06
017A: MOVWF 0D
017B: CLRF 0C
017C: MOVLW 8F
017D: MOVWF 0E
017E: MOVLB 3E
017F: CLRF 38
0180: CLRF 4E
0181: MOVLB 13
0182: CLRF 11
0183: CLRF 12
0184: CLRF 13
0185: CLRF 10
0186: CLRF 15
0187: CLRF 16
0188: CLRF 17
0189: CLRF 14
.................... {
.................... setup_timer_2(T2_DIV_BY_1, 127, 1);
018A: MOVLB 05
018B: CLRF 11
018C: CLRF 0F
018D: CLRF 10
018E: MOVLW 7F
018F: MOVWF 0D
0190: MOVLW 80
0191: MOVWF 0E
....................
.................... pwm_set_frequency(10000); // set frequency
0192: MOVLB 00
0193: CLRF 24
0194: CLRF 23
0195: MOVLW 27
0196: MOVWF 22
0197: MOVLW 10
0198: MOVWF 21
0199: CLRF 28
019A: MOVLW 3D
019B: MOVWF 27
019C: MOVLW 09
019D: MOVWF 26
019E: CLRF 25
019F: GOTO 050
.................... pwm_set_duty_percent(200); // 20% duty cycle
01A0: CLRF 22
01A1: MOVLW C8
01A2: MOVWF 21
01A3: GOTO 0EA
....................
.................... pwm_on();
01A4: MOVLB 06
01A5: BSF 0E.7
....................
.................... while(TRUE)
.................... {
.................... output_high(PIN_C2);
01A6: MOVLB 00
01A7: BCF 14.2
01A8: BSF 1A.2
.................... delay_ms(1000);
01A9: MOVLW 04
01AA: MOVWF 21
01AB: MOVLW FA
01AC: MOVWF 22
01AD: CALL 144
01AE: DECFSZ 21,F
01AF: GOTO 1AB
.................... output_low(PIN_C2);
01B0: BCF 14.2
01B1: BCF 1A.2
.................... delay_ms(1000);
01B2: MOVLW 04
01B3: MOVWF 21
01B4: MOVLW FA
01B5: MOVWF 22
01B6: CALL 144
01B7: DECFSZ 21,F
01B8: GOTO 1B4
01B9: GOTO 1A7
.................... }
.................... }
....................
01BA: SLEEP
Configuration Fuses:
Word 1: 3F8C NOEXTOSC RSTOSC_HFINTRC NOCLKOUT CKS FCMEN
Word 2: 3FFD MCLR PUT NOLPBOR BROWNOUT BORV24 ZCDDIS PPS1WAY STVREN NODEBUG
Word 3: 3F9F WDTSW NOWDT WDTWIN_SW WDTCLK_SW
Word 4: 1FFF BBSIZ512 BOOTBLOCK NOSAF WRT NOWRTB NOWRTC NOWRTSAF NOLVP
Word 5: 3FFF NOPROTECT
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