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[/] [minsoc/] [branches/] [verilator/] [sw/] [drivers/] [uart.c] - Rev 169
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#include <board.h> #include <support.h> #include "uart.h" #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) char tx_buff[UART_TX_BUFF_LEN]; volatile int tx_level, rx_level; void uart_init(void) { int divisor; /* Reset receiver and transmiter */ /* Set RX interrupt for each byte */ REG8(UART_BASE + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1; /* Enable RX interrupt */ REG8(UART_BASE + UART_IER) = UART_IER_RDI | UART_IER_THRI; /* 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 */ divisor = IN_CLK/(16 * UART_BAUD_RATE); REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB; REG8(UART_BASE + UART_DLM) = (divisor >> 8) & 0x000000ff; REG8(UART_BASE + UART_DLL) = divisor & 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; } char uart_getc() { char c; c = REG8(UART_BASE + UART_RX); return c; } void uart_interrupt() { char lala; unsigned char interrupt_id; interrupt_id = REG8(UART_BASE + UART_IIR); if ( interrupt_id & UART_IIR_RDI ) { lala = uart_getc(); uart_putc(lala+1); } } 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("0x"); 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("0x"); 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); } }
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