drv_uart.c

uCosII是一个小型的多任务调度内核

#include <assert.h>
#include "drv_defs.h"
#include "drv_extr.h"

#include "kal.h"

extern KL_mailbox_t mailbox;

/*------------------------------------------------------------------------------
Function:       uart_init
Date:           2005-11-21
Description:    Initialization of uart
Arguments:      None
Return Value:   None
------------------------------------------------------------------------------*/
void uart_init(void)
{
	/*------------------ uart1 ----------------------*/
	ULCON1   = 0x00000003;         /* 8bit data, 1bit stop, No parity */
	UCON1    = 0x000003C5;         /* use PCLK, level triger, Enable time out and
	                                  error interrupt, no loopback and break, 
	                                  use interrupt no DMA */
	UFCON1   = 0x000000A1;         /* 32-byte for TX, 16-byte for RX, enable FIFO */
	UBRDIV1  = 0x0000001A;         /* config div for 115200 from 50MHz */

	/* enable UART1's pin */
	{
		unsigned int port_con;      /* for save port configure */
		port_con  = GPHCON;         /* get port H configuration */
		port_con &= 0xFFFFF0FF;     /* clear UART1 pin setting */
		port_con |= 0xA00;          /* enable UART1 pin */
		GPHCON    = port_con;       /* configure it */
	}

	irq_clear_subsrc(INT_TXD1);
	irq_clear_subsrc(INT_RXD1);
	irq_clear_subsrc(INT_ERR1);
	irq_clear(IRQ_VECTOR_UART1);
	
	irq_disable_submask(INT_TXD1);
	irq_disable_submask(INT_RXD1);
	irq_disable_submask(INT_ERR1);

	irq_enable_submask(INT_RXD1);
	irq_enable(IRQ_VECTOR_UART1); /* enable the irq */
}


/*------------------------------------------------------------------------------
Function:       uart1_send_char
Date:           2005-11-21
Description:    send a char by uart1, it will be used by printf
Arguments:      
	ch          pointer to the char need to send
Return Value:   None
------------------------------------------------------------------------------*/
void uart1_send_char( char *ch )
{
	unsigned int fifo_staus = 0;    /* uart fifo status */

	fifo_staus = UFSTAT1;           /* get uart1 fifo status */
	while(fifo_staus & (1<<9))      /* fifo is full */
	{
		fifo_staus = UFSTAT1;       /* get uart1 fifo status */
	}
	
	UTXH1 = *ch;                    /* send the char */
}


void uart1_LISR(int vector)
{
	Status s;
	int num = 0;
	int i = 0;
	int subsrc, submsk;
	char  tmp;

	submsk = ~(INTSUBMSK);
	subsrc = SUBSRCPND;
	submsk &= subsrc;
	
	if (submsk & (1<<INT_RXD1))	/* INT_RXD */
	{
		num = UFSTAT1 & 0xF;	/* how many data in RX FIFO */
		for (i = 0; i < num; i++)
		{
			tmp = URXH1;
			s = KL_SendMail(&mailbox, (void *)tmp, KL_SUSPEND_NEVER);
			assert(s == KL_SUCCESS);
		}	

		irq_clear_subsrc(INT_RXD1);

	}

	irq_clear(IRQ_VECTOR_UART1);
}