init.c

at91sam9263 for rtc,其中rtc是npx公司的pcf8563

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : init.c
//* Object              : Low level initialisations written in C
//* Creation            : ODi   06/26/2002
//*
//*----------------------------------------------------------------------------

#include <stdarg.h>
#include <stdio.h>
#include <string.h>
#include "bsp.h"

#define AT91C_US_ASYNC_MODE ( AT91C_US_USMODE_NORMAL + \
                        AT91C_US_NBSTOP_1_BIT + \
                        AT91C_US_PAR_NONE + \
                        AT91C_US_CHRL_8_BITS + \
                        AT91C_US_CLKS_CLOCK )

//*----------------------------------------------------------------------------
//* \fn    AT91F_PIO_CfgPeriph
//* \brief Enable pins to be drived by peripheral
//*----------------------------------------------------------------------------
__inline void AT91F_PIO_CfgPeriph(
	AT91PS_PIO pPio,             // \arg pointer to a PIO controller
	unsigned int periphAEnable,  // \arg PERIPH A to enable
	unsigned int periphBEnable)  // \arg PERIPH B to enable

{
	pPio->PIO_ASR = periphAEnable;
	pPio->PIO_BSR = periphBEnable;
	pPio->PIO_PDR = (periphAEnable | periphBEnable); // Set in Periph mode
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_CfgPIO
//* \brief Configure PIO controllers to drive DBGU signals
//*----------------------------------------------------------------------------
__inline void AT91F_DBGU_CfgPIO (void)
{
	// Configure PIO controllers to periph mode
	AT91F_PIO_CfgPeriph(
		AT91C_BASE_PIOC, // PIO controller base address
		((unsigned int)AT91C_PC31_DTXD) |
		((unsigned int)AT91C_PC30_DRXD), // Peripheral A
		0); // Peripheral B
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_Baudrate
//* \brief Caluculate baud_value according to the main clock and the baud rate
//*----------------------------------------------------------------------------
__inline unsigned int AT91F_US_Baudrate (
	const unsigned int main_clock, // \arg peripheral clock
	const unsigned int baud_rate)  // \arg UART baudrate
{
	unsigned int baud_value = ((main_clock*10)/(baud_rate * 16));
	if ((baud_value % 10) >= 5)
		baud_value = (baud_value / 10) + 1;
	else
		baud_value /= 10;
	return baud_value;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_SetBaudrate
//* \brief Set the baudrate according to the CPU clock
//*----------------------------------------------------------------------------
__inline void AT91F_US_SetBaudrate (
	AT91PS_USART pUSART,    // \arg pointer to a USART controller
	unsigned int mainClock, // \arg peripheral clock
	unsigned int speed)     // \arg UART baudrate
{
	//* Define the baud rate divisor register
	pUSART->US_BRGR = AT91F_US_Baudrate(mainClock, speed);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_SetTimeguard
//* \brief Set USART timeguard
//*----------------------------------------------------------------------------
__inline void AT91F_US_SetTimeguard (
	AT91PS_USART pUSART,    // \arg pointer to a USART controller
	unsigned int timeguard) // \arg timeguard value
{
	//* Write the Timeguard Register
	pUSART->US_TTGR = timeguard ;
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_Configure
//* \brief Configure USART
//*----------------------------------------------------------------------------
__inline void AT91F_US_Configure (
	AT91PS_USART pUSART,     // \arg pointer to a USART controller
	unsigned int mainClock,  // \arg peripheral clock
	unsigned int mode ,      // \arg mode Register to be programmed
	unsigned int baudRate ,  // \arg baudrate to be programmed
	unsigned int timeguard ) // \arg timeguard to be programmed
{
    //* Disable interrupts
    pUSART->US_IDR = (unsigned int) -1;

    //* Reset receiver and transmitter
    pUSART->US_CR = AT91C_US_RSTRX | AT91C_US_RSTTX | AT91C_US_RXDIS | AT91C_US_TXDIS ;

	//* Define the baud rate divisor register
	AT91F_US_SetBaudrate(pUSART, mainClock, baudRate);

	//* Write the Timeguard Register
	AT91F_US_SetTimeguard(pUSART, timeguard);


    //* Define the USART mode
    pUSART->US_MR = mode  ;

}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_TxReady
//* \brief Return 1 if a character can be written in US_THR
//*----------------------------------------------------------------------------
__inline unsigned int AT91F_US_TxReady (
	AT91PS_USART pUSART )     // \arg pointer to a USART controller
{
    return (pUSART->US_CSR & AT91C_US_TXRDY);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_US_RxReady
//* \brief Return 1 if a character can be read in US_RHR
//*----------------------------------------------------------------------------
__inline unsigned int AT91F_US_RxReady (
	AT91PS_USART pUSART )     // \arg pointer to a USART controller
{
    return (pUSART->US_CSR & AT91C_US_RXRDY);
}


//*----------------------------------------------------------------------------
//* \fn    AT91F_US_PutChar
//* \brief Send a character,does not check if ready to send
//*----------------------------------------------------------------------------
__inline void AT91F_US_PutChar (
	AT91PS_USART pUSART,
	int character )
{
    pUSART->US_THR = (character & 0x1FF);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_US_GetChar
//* \brief Receive a character,does not check if a character is available
//*----------------------------------------------------------------------------
__inline int AT91F_US_GetChar (
	const AT91PS_USART pUSART)
{
    return((pUSART->US_RHR) & 0x1FF);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_Printk
//* \brief This function is used to send a string through the DBGU channel (Very low level debugging)
//*----------------------------------------------------------------------------
void AT91F_DBGU_Putc(
	char *buffer) // \arg pointer to a string ending by \0
{
	while(*buffer != '\0') {
		while (!AT91F_US_TxReady((AT91PS_USART)AT91C_BASE_DBGU));
		AT91F_US_PutChar((AT91PS_USART)AT91C_BASE_DBGU, *buffer++);
	}
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_getc
//* \brief This function is used to receive a character to the DBGU channel
//*----------------------------------------------------------------------------
char AT91F_DBGU_Getc(void)
{
	while (!AT91F_US_RxReady((AT91PS_USART)AT91C_BASE_DBGU));
	return AT91F_US_GetChar((AT91PS_USART) AT91C_BASE_DBGU);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_DBGU_getc
//* \brief This function is used to receive a character to the DBGU channel
//*----------------------------------------------------------------------------
void putk(char *fmt,...)
{
	char str[256];
	va_list ap;
	
	va_start(ap,fmt);
	vsprintf(str, fmt,ap);
	AT91F_DBGU_Putc(str);
	va_end(ap);
}

//*----------------------------------------------------------------------------
//* \fn    AT91F_LowLevelInit
//* \brief This function performs very low level HW initialization
//*----------------------------------------------------------------------------
void AT91F_LowLevelInit()
{

	// Open PIO for DBGU
	AT91F_DBGU_CfgPIO();
	
	// Configure DBGU
	AT91F_US_Configure (
		(AT91PS_USART) AT91C_BASE_DBGU,          // DBGU base address
		AT91C_MASTER_CLOCK,            // 60 MHz
		AT91C_US_ASYNC_MODE ,        // mode Register to be programmed
		115200 ,                   // baudrate to be programmed
		0);                        // timeguard to be programmed

	((AT91PS_USART)AT91C_BASE_DBGU)->US_CR = AT91C_US_TXEN;
	((AT91PS_USART)AT91C_BASE_DBGU)->US_CR = AT91C_US_RXEN;
	

	putk("rtc projectv2008.10 ready\n\r");
}