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[/] [minsoc/] [trunk/] [sw/] [drivers/] [uart.c] - Diff between revs 149 and 158

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Rev 149 Rev 158
Line 4... Line 4...
 
 
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
#define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE)
 
 
#define WAIT_FOR_XMITR \
#define WAIT_FOR_XMITR \
        do { \
        do { \
                lsr = REG8(UART_BASE + UART_LSR); \
                lsr = REG8(uart_base + UART_LSR); \
        } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
        } while ((lsr & BOTH_EMPTY) != BOTH_EMPTY)
 
 
#define WAIT_FOR_THRE \
#define WAIT_FOR_THRE \
        do { \
        do { \
                lsr = REG8(UART_BASE + UART_LSR); \
                lsr = REG8(uart_base + UART_LSR); \
        } while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)
        } while ((lsr & UART_LSR_THRE) != UART_LSR_THRE)
 
 
#define CHECK_FOR_CHAR (REG8(UART_BASE + UART_LSR) & UART_LSR_DR)
#define CHECK_FOR_CHAR (REG8(uart_base + UART_LSR) & UART_LSR_DR)
 
 
#define WAIT_FOR_CHAR \
#define WAIT_FOR_CHAR \
        do { \
        do { \
                lsr = REG8(UART_BASE + UART_LSR); \
                lsr = REG8(uart_base + UART_LSR); \
        } while ((lsr & UART_LSR_DR) != UART_LSR_DR)
        } while ((lsr & UART_LSR_DR) != UART_LSR_DR)
 
 
#define UART_TX_BUFF_LEN 32
#define UART_TX_BUFF_LEN 32
#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)
#define UART_TX_BUFF_MASK (UART_TX_BUFF_LEN -1)
 
 
 
static unsigned long uart_base = 0;
 
 
char tx_buff[UART_TX_BUFF_LEN];
char tx_buff[UART_TX_BUFF_LEN];
volatile int tx_level, rx_level;
volatile int tx_level, rx_level;
 
 
void uart_init(void)
void uart_init(unsigned long base)
{
{
        int divisor;
        int divisor;
 
    uart_base = base;
        /* Reset receiver and transmiter */
        /* Reset receiver and transmiter */
        /* Set RX interrupt for each byte */
        /* 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;
        REG8(uart_base + UART_FCR) = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT | UART_FCR_TRIGGER_1;
 
 
        /* Enable RX interrupt */
        /* Enable RX interrupt */
        REG8(UART_BASE + UART_IER) = UART_IER_RDI | UART_IER_THRI;
        REG8(uart_base + UART_IER) = UART_IER_RDI | UART_IER_THRI;
 
 
        /* Set 8 bit char, 1 stop bit, no parity */
        /* Set 8 bit char, 1 stop bit, no parity */
        REG8(UART_BASE + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
        REG8(uart_base + UART_LCR) = UART_LCR_WLEN8 & ~(UART_LCR_STOP | UART_LCR_PARITY);
 
 
        /* Set baud rate */
        /* Set baud rate */
        divisor = IN_CLK/(16 * UART_BAUD_RATE);
        divisor = IN_CLK/(16 * UART_BAUD_RATE);
        REG8(UART_BASE + UART_LCR) |= UART_LCR_DLAB;
        REG8(uart_base + UART_LCR) |= UART_LCR_DLAB;
        REG8(UART_BASE + UART_DLM) = (divisor >> 8) & 0x000000ff;
        REG8(uart_base + UART_DLM) = (divisor >> 8) & 0x000000ff;
        REG8(UART_BASE + UART_DLL) = divisor & 0x000000ff;
        REG8(uart_base + UART_DLL) = divisor & 0x000000ff;
        REG8(UART_BASE + UART_LCR) &= ~(UART_LCR_DLAB);
        REG8(uart_base + UART_LCR) &= ~(UART_LCR_DLAB);
 
 
        return;
        return;
}
}
 
 
void uart_putc(char c)
void uart_putc(char c)
{
{
        unsigned char lsr;
        unsigned char lsr;
 
 
        WAIT_FOR_THRE;
        WAIT_FOR_THRE;
        REG8(UART_BASE + UART_TX) = c;
        REG8(uart_base + UART_TX) = c;
        WAIT_FOR_XMITR;
        WAIT_FOR_XMITR;
}
}
 
 
 
 
 
 
char uart_getc()
char uart_getc()
{
{
        char c;
        char c;
        c = REG8(UART_BASE + UART_RX);
        c = REG8(uart_base + UART_RX);
        return c;
        return c;
}
}
 
 
 
 
void uart_interrupt()
void uart_interrupt()
{
{
        char lala;
        char lala;
        unsigned char interrupt_id;
        unsigned char interrupt_id;
        interrupt_id = REG8(UART_BASE + UART_IIR);
        interrupt_id = REG8(uart_base + UART_IIR);
        if ( interrupt_id & UART_IIR_RDI )
        if ( interrupt_id & UART_IIR_RDI )
        {
        {
                lala = uart_getc();
                lala = uart_getc();
                uart_putc(lala+1);
                uart_putc(lala+1);
        }
        }

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