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https://opencores.org/ocsvn/openrisc_2011-10-31/openrisc_2011-10-31/trunk
Subversion Repositories openrisc_2011-10-31
[/] [openrisc/] [trunk/] [rtos/] [freertos-6.1.1/] [Demo/] [OpenRISC_SIM_GCC/] [drivers/] [uart.c] - Rev 620
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#include "support.h" #include "board.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) void uart_init(void) { int divisor; /* Diable interrupt */ REG8(UART_BASE + UART_IER) = 0x0; /* 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_DLL) = divisor & 0x000000ff; REG8(UART_BASE + UART_DLM) = (divisor >> 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; } char uart_getc(void) { unsigned char lsr; char c; WAIT_FOR_CHAR; c = REG8(UART_BASE + UART_RX); return c; } void uart_print_str(char *p) { while(*p != 0) { uart_putc(*p); p++; } } void uart_put_int(int n) { int a; char c; if (n<0) { uart_putc('-'); n = -n; } a = n/10; if(a) uart_put_int(a); c = '0' + (n % 10); uart_putc(c); }
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