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[/] [sdcard_mass_storage_controller/] [trunk/] [sw/] [sdc_dma/] [uart.c] - Rev 100
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/*$$HEADER*/ /******************************************************************************/ /* */ /* H E A D E R I N F O R M A T I O N */ /* */ /******************************************************************************/ // Project Name : Development Board Debugger Example // File Name : uart.c // Prepared By : jb // Project Start : 2009-01-01 // Sourced from OpenCores : http://opencores.org/cvsweb.shtml/or1k/orp/orp_soc/sw/uart/uart.c /*$$CHANGE HISTORY*/ /******************************************************************************/ /* */ /* C H A N G E H I S T O R Y */ /* */ /******************************************************************************/ // Date Version Description //------------------------------------------------------------------------ // 090101 1.0 First version, commented out main() jb /*$$DESCRIPTION*/ /******************************************************************************/ /* */ /* D E S C R I P T I O N */ /* */ /******************************************************************************/ // UART initialisation and usage functions /*$$INCLUDE FILES*/ /******************************************************************************/ /* */ /* I N C L U D E F I L E S */ /* */ /******************************************************************************/ #include "orsocdef.h" #include "board.h" #include "uart.h" /*$$DEFINES*/ /******************************************************************************/ /* */ /* D E F I N E S */ /* */ /******************************************************************************/ #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) #define WAIT_FOR_XMITR \ do { \ lsr = REG8(UART_BASE + UART_LSR); \ } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY) #define WAIT_FOR_THRE \ do { \ lsr = REG8(UART_BASE + UART_LSR); \ } while ((lsr & UART_LSR_THRE) != UART_LSR_THRE) #define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR) #define WAIT_FOR_CHAR \ do { \ lsr = REG8(UART_BASE + UART_LSR); \ } while ((lsr & UART_LSR_DR) != UART_LSR_DR) #define UART_TX_BUFF_LEN 32 #define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1) /*$$GLOBAL VARIABLES*/ /******************************************************************************/ /* */ /* G L O B A L V A R I A B L E S */ /* */ /******************************************************************************/ char tx_buff[UART_TX_BUFF_LEN]; volatile int tx_level, rx_level; /*$$FUNCTIONS*/ /******************************************************************************/ /* */ /* F U N C T I O N S */ /* */ /******************************************************************************/ void uart_init(void) { int devisor; /* Reset receiver and transmiter */ REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_14; /* Disable all interrupts */ REG8(UART_BASE + UART_IER) = 0x00; /* Set 8 bit char, 1 stop bit, no parity */ REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY); /* Set baud rate */ devisor = IN_CLK/(16 * UART_BAUD_RATE); REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB; REG8(UART_BASE + UART_DLL) = devisor & 0x000000ff; REG8(UART_BASE + UART_DLM) = (devisor >> 8) & 0x000000ff; REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB); return; } void uart_putc(char c) { unsigned char lsr; WAIT_FOR_THRE; REG8(UART_BASE + UART_TX) = c; if(c == '\n') { WAIT_FOR_THRE; REG8(UART_BASE + UART_TX) = '\r'; } WAIT_FOR_XMITR; } void uart_print_str(char *p) { while(*p != 0) { uart_putc(*p); p++; } } void uart_print_long(unsigned long ul) { int i; char c; uart_print_str(""); for(i=0; i<8; i++) { c = (char) (ul>>((7-i)*4)) & 0xf; if(c >= 0x0 && c<=0x9) c += '0'; else c += 'a' - 10; uart_putc(c); } } void uart_print_short(unsigned long ul) { int i; char c; char flag=0; uart_print_str(""); for(i=0; i<8; i++) { c = (char) (ul>>((7-i)*4)) & 0xf; if(c >= 0x0 && c<=0x9) c += '0'; else c += 'a' - 10; if ((c != '0') || (i==7)) flag=1; if(flag) uart_putc(c); } } char uart_getc() { unsigned char lsr; char c; WAIT_FOR_CHAR; c = REG8(UART_BASE + UART_RX); return c; } /******************************************************************************/ /* */ /* E X A M P L E U S A G E */ /* */ /******************************************************************************/ /* int main() { uart_init(); // We can't use printf because in this simple example // we don't link C library. uart_print_str("Hello World.\n\r"); report(0xdeaddead); exit(0); } */