I encountered a problem again, about the problem of PIC24FJ64GA004 clock oscillation

werjufour

I encountered a problem again, about the problem of PIC24FJ64GA004 clock oscillation [Copy link]

 

How to set the clock selection of PIC24FJ64GA004 microcontroller? I have written a program. I use software simulation SIM to simulate the delay function delay1s(); the delay time is more than 160ms. But the simulation effect on proteus simulation software is about 3 seconds. The LED is on for 3 seconds and off for 3 seconds. I don't know what's wrong. Can you help me? Thank you. Attached is the program and simulation picture.

dcexpert

Doesn't the current XC16 have a delay function? Just set the clock and you can use it.

werjufour

dcexpert posted on 2018-9-1 20:01 Doesn't the current XC16 have a delay function? Just set the clock and you can use it

I am using the c30 compiler. What is the problem here?

werjufour

_TRIS, MACRO_ARG21(pin), MACRO_ARG22(pin)) = DIR #define PIN_OUT(pin, OUT) MACRO_CONCAT3(_LAT, OUTPUT) MACRO_CONCAT3(_TRIS, MACRO_ARG21(pin), MACRO_ARG22(pin)) = DIR #define PIN_OUT(pin, OUT) MACRO_CONCAT3(_LAT, OUTPUT) MACRO_CONCAT3(_TRIS, MACRO_ARG21(pin), MACRO_ARG22(pin)) = DIR #define PIN_OUT(pin, OUT) MACRO_CONCAT3(_LAT, OUTPUT) MACRO_CONCAT3(_TRIS, MACRO_ARG21(pin), MACRO_ARG22(pin)) = DIR MACRO_ARG21(pin), MACRO_ARG22(pin)) = OUT #define PIN_IN(pin) MACRO_CONCAT3(_R, MACRO_ARG21(pin), MACRO_ARG22(pin))

dcexpert

werjufour posted on 2018-9-1 20:20 And I don't quite understand your definition #define MACRO_CONCAT2_EXPAND(a, b) a ## b #define MACRO_CONCAT2( ...

This is a special use of macros, which is to combine two contents into one. It is very useful when using a series of regular registers and is also common in many programs. In particular, when you want the program to automatically adapt to different models of MCUs, using this method to automatically configure the corresponding registers is very helpful for program porting. There is also a delay function in C30, which seems to be __delay_ms(). You need to include a header file. I haven't used PIC microcontrollers for a long time, so I can't remember it clearly. C30 can be replaced by XC16, which supports more functions.

werjufour

dcexpert posted on 2018-9-1 20:37 This is a special use of macros, which is to combine two contents into one. It is very useful when using a series of regular registers. In many programs...

This is the first time I have seen such a macro definition, so I was confused after reading it and had no idea what it meant. Which program I just used c30? Is there any solution?

werjufour

werjufour posted on 2018-9-1 20:41 This is the first time I have seen a macro definition like yours, so I was confused and had no idea what it meant. How can I solve the problem of using C30 in a program I just used...

Why is the actual effect different from the delay in my software?

迈尔风随

dcexpert posted on 2018-9-1 12:37 This is a special use of macros, which is to combine two contents into one. It is very useful when using a series of regular registers. In many programs...

Can this macro definition be applied to many MCUs? I don't understand what they mean

dcexpert

Posted by Mayer Fengsui on 2018-9-1 21:42 Can this macro definition usage be applied to many MCUs? I don’t understand what they mean

Most C compilers support it.

dcexpert

dcexpert posted on 2018-9-2 14:54 Most C compilers support it.

For example: #define IO_OUTPUT 0 #define IO_INPUT 1 #define PIN_DIR(pin, DIR) MACRO_CONCAT3(_TRIS, MACRO_ARG21(pin), MACRO_ARG22(pin)) = DIR In the program, the LED pin is defined: #define LED1 A, 1 Initialization setting: PIN_DIR(LED1, IO_OUTPUT) The actual result is _TRIS A = 1 This usage looks complicated, but the advantage is that it can make the program more portable and readable, and it is more convenient to port the code on different C compilers and different microcontrollers. For a more detailed explanation, please refer to the explanations and examples in my book "Special Topic on AVR Microcontroller Application".

dcexpert

werjufour posted on 2018-9-1 20:42 Why is my actual effect different from the delay on my software?

What is the difference? If it is just delay, first define _XTAL_FREQ in the program, which represents the system clock frequency #ifndef _XTAL_FREQ #define _XTAL_FREQ 4000000L #endif Then use __delay_ms() or __delay_us() to delay. Note that there are two underscores in front, don't write it wrong. If the delay effect is different, it means that the clock setting or the default configuration word is incorrect. Please refer to the manual for setting. To ensure the effect, you can write the configuration word in the program instead of setting it through the programmer (different PIC microcontrollers have different configuration words). For example: #pragma config FOSC = INTOSC // Oscillator Selection bits (INTOSC oscillator: CLKIN function disabled)

迈尔风随

dcexpert posted on 2018-9-2 07:02 For example: #define IO_OUTPUT 0 #define IO_INPUT 1 #define PIN_DIR(pin, DIR) M ...

I still don't understand. I'll go and look for "AVR Microcontroller Application Special Topic Lecture"

werjufour

dcexpert posted on 2018-9-2 15:07 What is the difference? If it is just a delay, first define _XTAL_FREQ in the program, which represents the system clock frequency #ifndef _XTAL_FREQ ...

First of all, thank you. In the MPLAB SIM software simulation, the stopwatch shows about 300MS, but in the Proteus simulation, it takes about 3s to delay. I don't know how long the built-in delay function delays __delay_ms(). For example, if I want to delay 50ms, what should I fill in the system clock frequency and actual parameters?

werjufour

Posted by Mayer Fengsui on 2018-9-2 16:53 I still don't understand it. I'll go look for "AVR Microcontroller Application Special Topic" to take a look

If you find it, send it to me. I really don't understand it.

迈尔风随

werjufour posted on 2018-9-2 14:31 If you find it, please send it to me. I really don't understand it.

I looked it up online, but there is no electronic file to read. This is a printed book, so you can only buy the book to read it.

dcexpert

werjufour posted on 2018-9-2 22:29 First of all, thank you. The stopwatch in my MPLAB SIM software simulation shows about 300MS, but in the Proteus simulation, it takes about 3s to delay...

The clock must be set to the actual frequency, so that the time can be calculated accurately.

werjufour

Posted by Meier Fengsui on 2018-9-3 00:25 I looked it up online, but there is no electronic file available. This is an unpublished book, so you can only buy the book to read it

Isn’t the host the author?

werjufour

dcexpert posted on 2018-9-3 12:26 The clock must be set to the actual frequency, so that the time can be calculated accurately.

Sir, how do I use these two delay functions __delay_ms() or __delay_us()? How do I write a delay of 50ms and 10us?

dcexpert

werjufour posted on 2018-9-3 18:34 Hero, how do I use these two delay functions __delay_ms() or __delay_us(? How should I write a delay of 50ms and 10us?

The parameter is the delay time, __delay_ms(50) is 50ms. Of course, because it uses code delay instead of a timer, the accuracy is not very high.

werjufour

dcexpert posted on 2018-9-3 21:57 The parameter is the delay time, __delay_ms(50) is 50ms. Of course, because it uses code delay instead of timer, the accuracy is not very...

The crystal oscillators I use are 8M, 16M, and 32M. Is the delay time of this delay function __delay_ms(50) always 50ms?