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CLKOUT problem

I am using LPC1114.

I have configured P0.1 as CLKOUT pin,but in simulation , it is not showing that pin as CLKOUT pin and instead it is showing it as 'reserved'

Parents

0 neo nav over 15 years ago

the following my code



#include "LPC11xx.h"

#define IER_RBR         0x01
#define IER_THRE        0x02
#define IER_RLS         0x04

#define LSR_RDR         0x01
#define LSR_THRE        0x20
#define BUFSIZE         0x40

#define SystemFrequency SystemCoreClock
#define SystemCoreClock 12000000UL

void UARTInit(unsigned int Baudrate);
void UARTSend(void);
void UARTRecv(void);

volatile unsigned char  UARTBuffer[40],RECV;

int main (void)
{
        UARTInit(9600);
        while (1)
        {
        UARTRecv();
        UARTSend();
        }
}



/*=========================================================================================*/
void UARTInit(unsigned int baudrate)
{
        unsigned int regVal;
        unsigned int Fdiv;


        LPC_IOCON->PIO1_6 &= ~0x07;          /*  UART I/O config */
        LPC_IOCON->PIO1_6 |= 0x01;           /* UART RXD */
        LPC_IOCON->PIO1_7 &= ~0x07;
        LPC_IOCON->PIO1_7 |= 0x01;           /* UART TXD */

        LPC_GPIO0->DIR |= (1<<1);
        LPC_IOCON->PIO0_1 &= ~0x07;      /*  UART I/O config */
        LPC_IOCON->PIO0_1 |= 0x01;           /* clock out*/

        LPC_SYSCON->SYSPLLCLKSEL = 0x00;    //0-IRC,1-SYS Osc
        LPC_SYSCON->SYSPLLCLKUEN = 0x01;
        LPC_SYSCON->SYSPLLCLKUEN = 0x00;
        LPC_SYSCON->SYSPLLCLKUEN = 0x01;

        LPC_SYSCON->MAINCLKSEL    = 0x00;    //0-IRC Osc,1-PLL i/p,2-WDT,3-PLL o/p
        LPC_SYSCON->MAINCLKUEN    = 0x01;
        LPC_SYSCON->MAINCLKUEN    = 0x00;
        LPC_SYSCON->MAINCLKUEN    = 0x01;
        while (!(LPC_SYSCON->MAINCLKUEN & 0x01));

        LPC_SYSCON->CLKOUTCLKSEL = 0x00;     // 0-IRC,1-Sys Osc,2-WD Osc,3-Main clk
        LPC_SYSCON->CLKOUTCLKSEL = 0x01;
        LPC_SYSCON->CLKOUTCLKSEL = 0x00;
        LPC_SYSCON->CLKOUTCLKSEL = 0x01;

        LPC_SYSCON->SYSPLLCTRL = 0x00000180;
        LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);  // UART CLK enable
        LPC_SYSCON->UARTCLKDIV = 0x01;       /* divided by 1 , like pre-scaler*/

        LPC_UART->LCR = 0x83;                /* DLB=1, 8 bits, no Parity, 1 Stop bit */
        regVal = LPC_SYSCON->UARTCLKDIV;

        Fdiv = (((SystemCoreClock/LPC_SYSCON->SYSAHBCLKDIV)/regVal)/16)/baudrate ;

        LPC_UART->DLM = Fdiv / 256;
        LPC_UART->DLL = Fdiv % 256;

        LPC_UART->LCR = 0x03;        /* DLAB = 0 ,Disable access to divisor latches*/
        LPC_UART->FCR = 0x07;        /* Enable and reset TX and RX FIFO. */
        regVal = LPC_UART->LSR;      /* Read to clear the line status. */

        return;
}

void UARTSend()
{

        LPC_UART->THR = RECV;
        while ( !(LPC_UART->LSR & 0x40) //wait until TEMT=0,i.e. U0THR contains valid data
}

void UARTRecv()
{
        while(!(LPC_UART->LSR & (0x01)));
        RECV=LPC_UART->RBR;
}

Please anyone answer these:

1. Is this code correct in using clocks? 2. I'm not getting 12Mhz signal at P0.1,why? 3. Using this snippet I want to test serial communication,but I'm getting simulation o/p only. I am not getting o/p from micro controller after dumping. why?

Reply

0 neo nav over 15 years ago

the following my code



#include "LPC11xx.h"

#define IER_RBR         0x01
#define IER_THRE        0x02
#define IER_RLS         0x04

#define LSR_RDR         0x01
#define LSR_THRE        0x20
#define BUFSIZE         0x40

#define SystemFrequency SystemCoreClock
#define SystemCoreClock 12000000UL

void UARTInit(unsigned int Baudrate);
void UARTSend(void);
void UARTRecv(void);

volatile unsigned char  UARTBuffer[40],RECV;

int main (void)
{
        UARTInit(9600);
        while (1)
        {
        UARTRecv();
        UARTSend();
        }
}



/*=========================================================================================*/
void UARTInit(unsigned int baudrate)
{
        unsigned int regVal;
        unsigned int Fdiv;


        LPC_IOCON->PIO1_6 &= ~0x07;          /*  UART I/O config */
        LPC_IOCON->PIO1_6 |= 0x01;           /* UART RXD */
        LPC_IOCON->PIO1_7 &= ~0x07;
        LPC_IOCON->PIO1_7 |= 0x01;           /* UART TXD */

        LPC_GPIO0->DIR |= (1<<1);
        LPC_IOCON->PIO0_1 &= ~0x07;      /*  UART I/O config */
        LPC_IOCON->PIO0_1 |= 0x01;           /* clock out*/

        LPC_SYSCON->SYSPLLCLKSEL = 0x00;    //0-IRC,1-SYS Osc
        LPC_SYSCON->SYSPLLCLKUEN = 0x01;
        LPC_SYSCON->SYSPLLCLKUEN = 0x00;
        LPC_SYSCON->SYSPLLCLKUEN = 0x01;

        LPC_SYSCON->MAINCLKSEL    = 0x00;    //0-IRC Osc,1-PLL i/p,2-WDT,3-PLL o/p
        LPC_SYSCON->MAINCLKUEN    = 0x01;
        LPC_SYSCON->MAINCLKUEN    = 0x00;
        LPC_SYSCON->MAINCLKUEN    = 0x01;
        while (!(LPC_SYSCON->MAINCLKUEN & 0x01));

        LPC_SYSCON->CLKOUTCLKSEL = 0x00;     // 0-IRC,1-Sys Osc,2-WD Osc,3-Main clk
        LPC_SYSCON->CLKOUTCLKSEL = 0x01;
        LPC_SYSCON->CLKOUTCLKSEL = 0x00;
        LPC_SYSCON->CLKOUTCLKSEL = 0x01;

        LPC_SYSCON->SYSPLLCTRL = 0x00000180;
        LPC_SYSCON->SYSAHBCLKCTRL |= (1<<12);  // UART CLK enable
        LPC_SYSCON->UARTCLKDIV = 0x01;       /* divided by 1 , like pre-scaler*/

        LPC_UART->LCR = 0x83;                /* DLB=1, 8 bits, no Parity, 1 Stop bit */
        regVal = LPC_SYSCON->UARTCLKDIV;

        Fdiv = (((SystemCoreClock/LPC_SYSCON->SYSAHBCLKDIV)/regVal)/16)/baudrate ;

        LPC_UART->DLM = Fdiv / 256;
        LPC_UART->DLL = Fdiv % 256;

        LPC_UART->LCR = 0x03;        /* DLAB = 0 ,Disable access to divisor latches*/
        LPC_UART->FCR = 0x07;        /* Enable and reset TX and RX FIFO. */
        regVal = LPC_UART->LSR;      /* Read to clear the line status. */

        return;
}

void UARTSend()
{

        LPC_UART->THR = RECV;
        while ( !(LPC_UART->LSR & 0x40) //wait until TEMT=0,i.e. U0THR contains valid data
}

void UARTRecv()
{
        while(!(LPC_UART->LSR & (0x01)));
        RECV=LPC_UART->RBR;
}

Please anyone answer these:

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