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mvme5100
Joined: 10 Nov 2016
Posts: 6
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| ECCP1 PIC18LF45k50 |
 Posted: Thu Nov 10, 2016 3:09 am |
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Hello,
I need your help regard activating ECCP1 @ RD5/P1B at PIC18LF45K50.
I saw this thread: https://www.ccsinfo.com/forum/viewtopic.php?p=105632
with the code inside, but i dont have a success to adjust the coreect registers i assume.
Thank you |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19257
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| Posted: Thu Nov 10, 2016 3:32 am |
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Old question. _What compiler version_.
The thread you point to, is very old, and was before the compiler had got ECCP support sorted on that particular chip. If your compiler is anything more modern, then the standard functions work.
The only mode that gives you P1B, without any other CCP1 pin activated, is full bridge reverse. If you don't want the other pins, you would have to use the output override functions. |
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mvme5100
Joined: 10 Nov 2016
Posts: 6
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| ECCP1 PIC18LF45k50 |
| Posted: Thu Nov 10, 2016 4:45 am |
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Hello
The compiler is 5.064 .
If i'm using this code then the regular CCP1 and CCP2 are working.
But the P1B and P1C arent.
| Code: |
#include <18lf45k50.h>
#Device ADC=10
#Device ICD=TRUE
#define XTAL_FREQUENCY 4000000
#define TIMER1_FREQUENCY (XTAL_FREQUENCY / 4)
#fuses INTRC_IO,NOPROTECT
//#define DEEP_SLEEP 3
#use delay (clock=4000000)
//#use delay(clock=40M)
#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL, SLOW)
#use rs232(baud = 9600, xmit=PIN_C6, rcv = PIN_C7, stream=STREAM_USER_UART, timeout=200)
void main()
{
printf("\n\r ====================== ");
printf("\n\r ====== POWER ON ====== ");
printf("\n\r ====================== \n\r");
SETUP_WDT (WDT_OFF);
setup_comparator(NC_NC_NC_NC);
setup_timer_2(T2_DIV_BY_16,255,1); // For PWM 4Mhz crystal
//setup_timer_1(T1_INTERNAL|T3_DIV_BY_4);
//enable_interrupts(GLOBAL);
//enable_interrupts(INT_USB);
while (1) {
setup_ccp1(CCP_PWM_L_L);
set_pwm1_duty(100); /// 0 - 255
setup_ccp2(CCP_PWM_L_L);
set_pwm2_duty(100); /// 0 - 255
}
} |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19257
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| Posted: Thu Nov 10, 2016 5:28 am |
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It would. You are only in simple PWM mode. This only drives the 'A' pins/
The L_L setting sets the polarity for the signals, not the operating mode of the PWM.
Look at the data sheet. PWM output diagrams. Figure 15-6. If you want both modulated, you need half bridge. So:
| Code: |
setup_ccp1(CCP_PWM_HALF_BRIDGE | CCP_PWM_L_L); |
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mvme5100
Joined: 10 Nov 2016
Posts: 6
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| ECCP1 PIC18LF45k50 |
| Posted: Thu Nov 10, 2016 5:41 am |
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Great, got the idea.
Thank you so much |
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