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/*$$HEADER*/
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/******************************************************************************/
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/* */
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/* H E A D E R I N F O R M A T I O N */
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/* */
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/******************************************************************************/
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// Project Name : Development Board Debugger Example
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// File Name : uart.c
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// Prepared By : jb
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// Project Start : 2009-01-01
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// Sourced from OpenCores : http://opencores.org/cvsweb.shtml/or1k/orp/orp_soc/sw/uart/uart.c
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/*$$CHANGE HISTORY*/
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/******************************************************************************/
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/* */
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/* C H A N G E H I S T O R Y */
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/* */
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/******************************************************************************/
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// Date Version Description
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//------------------------------------------------------------------------
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// 090101 1.0 First version, commented out main() jb
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/*$$DESCRIPTION*/
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/******************************************************************************/
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/* */
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/* D E S C R I P T I O N */
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/* */
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/******************************************************************************/
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// UART initialisation and usage functions
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/*$$INCLUDE FILES*/
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/******************************************************************************/
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/* */
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/* I N C L U D E F I L E S */
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/* */
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/******************************************************************************/
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#include "orsocdef.h"
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#include "board.h"
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#include "uart.h"
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/*$$DEFINES*/
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/******************************************************************************/
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/* */
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/* D E F I N E S */
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/* */
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/******************************************************************************/
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#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
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#define WAIT_FOR_XMITR \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
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#define WAIT_FOR_THRE \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)
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#define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR)
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#define WAIT_FOR_CHAR \
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do { \
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lsr = REG8(UART_BASE + UART_LSR); \
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} while ((lsr & UART_LSR_DR) != UART_LSR_DR)
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#define UART_TX_BUFF_LEN 32
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#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)
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/*$$GLOBAL VARIABLES*/
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/******************************************************************************/
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/* */
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/* G L O B A L V A R I A B L E S */
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/* */
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/******************************************************************************/
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char tx_buff[UART_TX_BUFF_LEN];
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volatile int tx_level, rx_level;
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/*$$FUNCTIONS*/
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/******************************************************************************/
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/* */
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/* F U N C T I O N S */
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/* */
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/******************************************************************************/
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void uart_init(void)
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{
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int devisor;
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/* Reset receiver and transmiter */
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REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14;
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/* Disable all interrupts */
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REG8(UART_BASE + UART_IER) = 0x00;
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/* Set 8 bit char, 1 stop bit, no parity */
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REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
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/* Set baud rate */
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devisor = IN_CLK/(16 * UART_BAUD_RATE);
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REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB;
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REG8(UART_BASE + UART_DLL) = devisor & 0x000000ff;
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REG8(UART_BASE + UART_DLM) = (devisor >> 8) & 0x000000ff;
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REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB);
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return;
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}
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void uart_putc(char c)
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{
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unsigned char lsr;
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WAIT_FOR_THRE;
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REG8(UART_BASE + UART_TX) = c;
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if(c == '\n') {
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WAIT_FOR_THRE;
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REG8(UART_BASE + UART_TX) = '\r';
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}
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WAIT_FOR_XMITR;
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}
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void uart_print_str(char *p)
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{
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while(*p != 0) {
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uart_putc(*p);
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p++;
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}
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}
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void uart_print_long(unsigned long ul)
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{
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int i;
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char c;
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uart_print_str("");
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for(i=0; i<8; i++) {
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c = (char) (ul>>((7-i)*4)) & 0xf;
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if(c >= 0x0 && c<=0x9)
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c += '0';
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else
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c += 'a' - 10;
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uart_putc(c);
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}
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}
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void uart_print_short(unsigned long ul)
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{
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int i;
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char c;
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char flag=0;
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uart_print_str("");
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for(i=0; i<8; i++) {
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c = (char) (ul>>((7-i)*4)) & 0xf;
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if(c >= 0x0 && c<=0x9)
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c += '0';
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else
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c += 'a' - 10;
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if ((c != '0') || (i==7))
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flag=1;
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if(flag)
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uart_putc(c);
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}
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}
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char uart_getc()
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{
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unsigned char lsr;
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char c;
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WAIT_FOR_CHAR;
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c = REG8(UART_BASE + UART_RX);
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return c;
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}
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/******************************************************************************/
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/* */
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/* E X A M P L E U S A G E */
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/* */
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/******************************************************************************/
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/*
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int main()
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{
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uart_init();
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// We can't use printf because in this simple example
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// we don't link C library.
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uart_print_str("Hello World.\n\r");
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report(0xdeaddead);
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exit(0);
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}
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*/
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No newline at end of file
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No newline at end of file
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