hal_diag.c

基于ecos的redboot

    case __COMMCTL_IRQ_ENABLE:
        HAL_INTERRUPT_UNMASK(chan->isr_vector);
        HAL_INTERRUPT_SET_LEVEL(chan->isr_vector, 1);
        HAL_READ_UINT8(chan->base+CYG_DEV_SERIAL_IER, ier);
        ier |= SIO_IER_ERDAI;
        HAL_WRITE_UINT8(chan->base+CYG_DEV_SERIAL_IER, ier);
        irq_state = 1;
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;
        irq_state = 0;
        HAL_INTERRUPT_MASK(chan->isr_vector);
        HAL_READ_UINT8(chan->base+CYG_DEV_SERIAL_IER, ier);
        ier &= ~SIO_IER_ERDAI;
        HAL_WRITE_UINT8(chan->base+CYG_DEV_SERIAL_IER, ier);
        break;
    case __COMMCTL_DBG_ISR_VECTOR:
        ret = chan->isr_vector;
        break;
    case __COMMCTL_SET_TIMEOUT:
    {
        va_list ap;

        va_start(ap, __func);

        ret = chan->msec_timeout;
        chan->msec_timeout = va_arg(ap, cyg_uint32);

        va_end(ap);
    }        
    default:
        break;
    }
    CYGARC_HAL_RESTORE_GP();
    return ret;
}

static int
cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc, 
                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)
{
    channel_data_t* chan = (channel_data_t*)__ch_data;
    cyg_uint8 _iir;
    int res = 0;
    CYGARC_HAL_SAVE_GP();

    HAL_READ_UINT8(chan->base+CYG_DEV_SERIAL_IIR, _iir);
    _iir &= SIO_IIR_ID_MASK;

    *__ctrlc = 0;
    if ( ISR_Rx == _iir ) {
        cyg_uint8 c, lsr;
        HAL_READ_UINT8(chan->base+CYG_DEV_SERIAL_LSR, lsr);
        if (lsr & SIO_LSR_DR) {

            HAL_READ_UINT8(chan->base+CYG_DEV_SERIAL_RBR, c);

            if( cyg_hal_is_break( &c , 1 ) )
                *__ctrlc = 1;
        }

        // Acknowledge the interrupt
        HAL_INTERRUPT_ACKNOWLEDGE(chan->isr_vector);
        res = CYG_ISR_HANDLED;
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}

static void
cyg_hal_plf_serial_init(void)
{
    hal_virtual_comm_table_t* comm;
    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Disable interrupts.
    HAL_INTERRUPT_MASK(channels[0].isr_vector);
    HAL_INTERRUPT_MASK(channels[1].isr_vector);

    // Init channels
    init_serial_channel(&channels[0]);
    init_serial_channel(&channels[1]);

    // Setup procs in the vector table

    // Set channel 0
    CYGACC_CALL_IF_SET_CONSOLE_COMM(0);
    comm = CYGACC_CALL_IF_CONSOLE_PROCS();
    CYGACC_COMM_IF_CH_DATA_SET(*comm, &channels[0]);
    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);
    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);
    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);
    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);
    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);
    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);
    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);

    // Set channel 1
    CYGACC_CALL_IF_SET_CONSOLE_COMM(1);
    comm = CYGACC_CALL_IF_CONSOLE_PROCS();
    CYGACC_COMM_IF_CH_DATA_SET(*comm, &channels[1]);
    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);
    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);
    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);
    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);
    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);
    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);
    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);
    
    // Restore original console
    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
}


//=============================================================================
// Compatibility with older stubs
//=============================================================================

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG


#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
#include <cyg/hal/drv_api.h>
#include <cyg/hal/hal_stub.h>           // cyg_hal_gdb_interrupt
#endif

// Assumption: all diagnostic output must be GDB packetized unless this is a ROM (i.e.
// totally stand-alone) system.

#if defined(CYG_HAL_STARTUP_ROM) || !defined(CYGDBG_HAL_DIAG_TO_DEBUG_CHAN)
#define HAL_DIAG_USES_HARDWARE
#endif

/*---------------------------------------------------------------------------*/
#if CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL==0
// This is the base address of the A-channel
#define CYG_DEV_SERIAL_BASE      CYG_DEV_SERIAL_BASE_A
#define CYG_DEV_SERIAL_INT       CYGNUM_HAL_INTERRUPT_SERIAL_A
#else
// This is the base address of the B-channel
#define CYG_DEV_SERIAL_BASE      CYG_DEV_SERIAL_BASE_B
#define CYG_DEV_SERIAL_INT       CYGNUM_HAL_INTERRUPT_SERIAL_B
#endif

static channel_data_t ser_channel = { (cyg_uint8*)CYG_DEV_SERIAL_BASE, 0, 0};

#ifdef HAL_DIAG_USES_HARDWARE

void hal_diag_init(void)
{
    static int init = 0;
    char *msg = "\n\rARM eCos\n\r";

    if (init++) return;

    init_serial_channel(&ser_channel);

    while (*msg) hal_diag_write_char(*msg++);
}

#ifdef DEBUG_DIAG
#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
#define DIAG_BUFSIZE 32
#else
#define DIAG_BUFSIZE 2048
#endif
static char diag_buffer[DIAG_BUFSIZE];
static int diag_bp = 0;
#endif

void hal_diag_write_char(char c)
{
    cyg_uint8 lsr;

    hal_diag_init();

    cyg_hal_plf_serial_putc(&ser_channel, c);

#ifdef DEBUG_DIAG
    diag_buffer[diag_bp++] = c;
    if (diag_bp == DIAG_BUFSIZE) {
        while (1) ;
        diag_bp = 0;
    }
#endif
}

void hal_diag_read_char(char *c)
{
    *c = cyg_hal_plf_serial_getc(&ser_channel);
}

#else // HAL_DIAG relies on GDB

// Initialize diag port - assume GDB channel is already set up
void hal_diag_init(void)
{
    if (0) init_serial_channel(&ser_channel); // avoid warning
}

// Actually send character down the wire
static void
hal_diag_write_char_serial(char c)
{
    cyg_hal_plf_serial_putc(&ser_channel, c);
}

static bool
hal_diag_read_serial(char *c)
{
    long timeout = 1000000000;  // A long time...
    while (!cyg_hal_plf_serial_getc_nonblock(&ser_channel, c))
        if (0 == --timeout) return false;

    return true;
}

void 
hal_diag_read_char(char *c)
{
    while (!hal_diag_read_serial(c)) ;
}

void 
hal_diag_write_char(char c)
{
    static char line[100];
    static int pos = 0;

    // No need to send CRs
    if( c == '\r' ) return;

    line[pos++] = c;

    if( c == '\n' || pos == sizeof(line) )
    {
        CYG_INTERRUPT_STATE old;

        // Disable interrupts. This prevents GDB trying to interrupt us
        // while we are in the middle of sending a packet. The serial
        // receive interrupt will be seen when we re-enable interrupts
        // later.
        
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION(old);
#else
        HAL_DISABLE_INTERRUPTS(old);
#endif

        while(1)
        {
            static char hex[] = "0123456789ABCDEF";
            cyg_uint8 csum = 0;
            int i;
            char c1;
        
            hal_diag_write_char_serial('$');
            hal_diag_write_char_serial('O');
            csum += 'O';
            for( i = 0; i < pos; i++ )
            {
                char ch = line[i];
                char h = hex[(ch>>4)&0xF];
                char l = hex[ch&0xF];
                hal_diag_write_char_serial(h);
                hal_diag_write_char_serial(l);
                csum += h;
                csum += l;
            }
            hal_diag_write_char_serial('#');
            hal_diag_write_char_serial(hex[(csum>>4)&0xF]);
            hal_diag_write_char_serial(hex[csum&0xF]);

            // Wait for the ACK character '+' from GDB here and handle
            // receiving a ^C instead.  This is the reason for this clause
            // being a loop.
            if (!hal_diag_read_serial(&c1))
                continue;   // No response - try sending packet again

            if( c1 == '+' )
                break;              // a good acknowledge

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
            cyg_drv_interrupt_acknowledge(CYG_DEV_SERIAL_INT);
            if( c1 == 3 ) {
                // Ctrl-C: breakpoint.
                cyg_hal_gdb_interrupt (__builtin_return_address(0));
                break;
            }
#endif
            // otherwise, loop round again
        }
        
        pos = 0;

        // And re-enable interrupts
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        CYG_HAL_GDB_LEAVE_CRITICAL_IO_REGION(old);
#else
        HAL_RESTORE_INTERRUPTS(old);
#endif
        
    }
}
#endif

#endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

/*---------------------------------------------------------------------------*/
/* End of hal_diag.c */