Arkadaşlar selam,aşağıdaki code parçası pll ayarlıyorum problem yok ama çalıştırdığım zaman saçmalıyor ,düzeltmek için startup.s dosyasına giriyorum peripheral clock selection register0 (pclksel0) - PCLK_UART0 ----> Pclk=Cclk/4 yerine 2 yapıyorum düzeliyor ,bunun sebebi nedir.
Şimdiden teşekkürler.
/*****************************************************************************
* target.h: Header file for NXP LPC23xx/24xx Family Microprocessors
*
* Copyright(C) 2006, NXP Semiconductor
* All rights reserved.
*
* History
* 2006.09.20 ver 1.00 Prelimnary version, first Release
*
******************************************************************************/
#ifndef __TARGET_H
#define __TARGET_H
#ifdef __cplusplus
extern "C" {
#endif
/* Only choose one of them below, by default, it's Keil MCB2300 */
#define ENG_BOARD_LPC24XX 0
#define KEIL_BOARD_LPC23XX 1
#define EA_BOARD_LPC24XX 0
#define IAR_BOARD_LPC23XX 0
/* On EA and IAR boards, they use Micrel PHY.
on ENG and KEIL boards, they use National PHY */
#define NATIONAL_PHY 1
#define MICREL_PHY 2
/* If USB device is used, CCO will be 288Mhz( divided by 6) or 384Mhz( divided by 8)
to get precise USB clock 48Mhz. If USB is not used, you set any clock you want
but make sure the divider of the CCO should be an even number. If you want to
use USB, change "define USE_USB" from 0 to 1 */
#define USE_USB 1
/* PLL Setting Table Matrix */
/*
Main Osc. CCLKCFG Fcco Fcclk M N
12Mhz 29 300Mhz 10Mhz 24 1
12Mhz 35 360Mhz 10Mhz 14 0
12Mhz 27 336Mhz 12Mhz 13 0
12Mhz 17 360Mhz 20Mhz 14 0
12Mhz 13 336Mhz 24Mhz 13 0
12Mhz 11 300Mhz 25Mhz 24 1
12Mhz 9 300Mhz 30Mhz 24 1
12Mhz 11 360Mhz 30Mhz 14 0
12Mhz 9 320Mhz 32Mhz 39 2
12Mhz 9 350Mhz 35Mhz 174 11
12Mhz 7 312Mhz 39Mhz 12 0
12Mhz 7 360Mhz 45Mhz 14 0
12Mhz 5 300Mhz 50Mhz 24 1
12Mhz 5 312Mhz 52Mhz 12 0
12Mhz 5 336Mhz 56Mhz 13 0
12Mhz 3 300Mhz 75Mhz 24 1
12Mhz 3 312Mhz 78Mhz 12 0
12Mhz 3 320Mhz 80Mhz 39 2
12Mhz 3 336Mhz 84Mhz 13 0
*/
/* These are limited number of Fcco configuration for
USB communication as the CPU clock and USB clock shares
the same PLL. The USB clock needs to be multiple of
48Mhz. */
#if USE_USB /* 1 is USB, 0 is non-USB related */
/* Fcck = 48Mhz, Fosc = 288Mhz, and USB 48Mhz */
#define PLL_MValue 11
#define PLL_NValue 0
#define CCLKDivValue 5
#define USBCLKDivValue 5
/* System configuration: Fosc, Fcclk, Fcco, Fpclk must be defined */
/* PLL input Crystal frequence range 4KHz~20MHz. */
#define Fosc 12000000
/* System frequence,should be less than 80MHz. */
#define Fcclk 48000000
#define Fcco 288000000
#else
/* Fcck = 60Mhz, Fosc = 360Mhz, USB can't be divided into 48Mhz
in this case, so USBCLKDivValue is not needed. */
#define PLL_MValue 14
#define PLL_NValue 0
#define CCLKDivValue 5
/* System configuration: Fosc, Fcclk, Fcco, Fpclk must be defined */
/* PLL input Crystal frequence range 4KHz~20MHz. */
#define Fosc 12000000
/* System frequence,should be less than 72MHz. */
#define Fcclk 60000000
#define Fcco 360000000
#endif
/* APB clock frequence , must be 1/2/4 multiples of ( Fcclk/4 ). */
/* If USB is enabled, the minimum APB must be greater than 16Mhz */
#if USE_USB
#define Fpclk (Fcclk / 2)
#else
#define Fpclk (Fcclk / 4)
#endif
/******************************************************************************
** Function name: TargetInit
**
** Descriptions: Initialize the target board; it is called in a
** necessary place, change it as needed
**
** parameters: None
** Returned value: None
**
******************************************************************************/
extern void TargetInit(void);
extern void ConfigurePLL( void );
extern void TargetResetInit(void);
#ifdef __cplusplus
}
#endif
#endif /* end __TARGET_H */
/******************************************************************************
** End Of File
******************************************************************************/
Saçmalıyor derken neyi kastetdiniz? Eğer saçma karakterler okuyosanız baudrate ayarında sorun vardır.Mesela UART ın çalışmaz pclk/4 iken 25 mhz dir pclk/2 iken 50 mhz ve baudrate hesabı 50 mhz e göre yapılmışsa baudrate uyuşmazlığından böyle bi sorun çıkar ortaya.
NXP'nin sitesinden 'LPC2000 UART Baudrate Calculator' excel formül dosyasını indirdim.Uart,baudrate değerlerimi girdiğimde aşağıdaki sonuçları çıkarıyor , fakat girdiğimde 115200 ile düzgün haberleştiremiyorum değişik karakterler çıkıyor . Bir şeyi gözden kaçırdım ama bulamadım , tıkandım ; yardımcı olan arkadaşlara için şimdiden teşekkür ederim.
LPC2000 UART Baudrate Calculator
Please enter the following two parameters:
UART clock [Hz] 57600000
Requested UART baudrate 115200
Maximum allowed relative error [%] 2,5
Best available fit for standard UART
UART baudrate 116129,03
Relative error 0,81%
UDL [dec] 31
UDLM [dec] 0
UDLL [dec] 31
Best available fit for enhanced UART
UART baudrate 115200,00
Relative error 0,00%
UDL [dec] 25
UDLM [dec] 0
UDLL [dec] 25
DivAddVal [dec] 1
MulVal [dec] 4
Terms of Use: http://www.nxp.com/terms
düzgün çalışmayan
{
U0FCR = 0x07; /* 8 bits, Parity yok, 1 Stop bit*/
U0LCR = 0x83; /*OK*/
U0DLL = 0x18; /*U0DLL = 0x3A;*/
U0DLM = 0x00;
U0LCR = 0x04;
}
hata olabilir olan bölüm;
PLLCON &= ~0x01; // Disable the PLL
PLL_Feed();
CLKSRCSEL = 0x01; // PLL clock source is main oscillator (Fin = 16 MHz)
PLLCFG = 0x8; // M=9, N=1 (2 x M x Fin) / N = Fcco = 288 MHz
PLL_Feed();
PLLCON = 0x01; // Enable the PLL
PLL_Feed();
CCLKCFG = 0x03; // CPU clock is 288 MHz / 4 = 72 MHz
USBCLKCFG = 0x05; // USB clock is 288 MHz / 6 = 48 MHz
PCLKSEL0 = 0x000000C0; // PCLK_UART0 is CCLK/8 clock
Kodun tamamı ;
#include "LPC23xx.h"
int putchar(int ch);
int getchar(void);
int i;
void PLL_Feed(void)
{
PLLFEED = 0xAA;
PLLFEED = 0x55;
}
void InitFrequency(void)
{
if((PLLSTAT & 0x02000000) != 0 ) // If PLL is already connected, disconnect the PLL
{
PLLCON &= ~0x02;
PLL_Feed();
}
PLLCON &= ~0x01; // Disable the PLL
PLL_Feed();
CLKSRCSEL = 0x01; // PLL clock source is main oscillator (Fin = 16 MHz)
PLLCFG = 0x8; // M=9, N=1 (2 x M x Fin) / N = Fcco = 288 MHz
PLL_Feed();
PLLCON = 0x01; // Enable the PLL
PLL_Feed();
CCLKCFG = 0x03; // CPU clock is 288 MHz / 4 = 72 MHz
USBCLKCFG = 0x05; // USB clock is 288 MHz / 6 = 48 MHz
PCLKSEL0 = 0x000000C0; // PCLK_UART0 is CCLK/8 clock
while(!(PLLSTAT & 0x04000000)); // Wait for the PLL lock
PLLCON |= 0x03; // Connect the PLL
PLL_Feed();
}
void InitGPIO(void)
{
PINSEL0 = 0x00000050;
}
int putchar(int ch) /* Write character to Serial Port */
{if (ch == '\n')
{while (!(U0LSR & 0x20));
U0THR = 0x0D; /* output CR */
}
while (!(U0LSR & 0x20));
return (U0THR = ch);
}
int getchar (void) /* Read character from Serial Port */
{while (!(U0LSR & 0x01));
return (U0RBR);
}
void InitUART0(void)
{
U0FCR = 0x07; /* 8 bits, Parity yok, 1 Stop bit*/
U0LCR = 0x83; /*OK*/
U0DLL = 0x18; /*U0DLL = 0x3A;*/
U0DLM = 0x00;
U0LCR = 0x04;
}
void Delay(unsigned int time)
{
while(time--);
}
int main(void)
{
InitFrequency();
InitGPIO();
InitUART0();
while(1)
{
putchar(getchar());
IOCLR1 = 0x0600;
Delay(50000);
IOSET1 = 0x0600;
Delay(50000);
}
}