hal_diag.c

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    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);
}


//=============================================================================
// LCD driver
//=============================================================================

// The LCD driver is only used by the new vector code. Cannot be used
// by the old compatibility cruft.

// FEMA 162B 16 character x 2 line LCD
// base addresses and register offsets *

#define MBD_BASE 0

#define LCD_BASE                (MBD_BASE + 0xEB00007)

#define LCD_DATA                0x00 // read/write lcd data
#define LCD_STAT                0x08 // read lcd busy status
#define LCD_CMD                 0x08 // write lcd command

// status register bit definitions
#define LCD_STAT_BUSY   0x80    // 1 = display busy
#define LCD_STAT_ADD    0x7F    // bits 0-6 return current display address

// command register definitions
#define LCD_CMD_RST             0x01    // clear entire display and reset display address
#define LCD_CMD_HOME            0x02    // reset display address and reset any shifting
#define LCD_CMD_ECL             0x04    // move cursor left one position on next data write
#define LCD_CMD_ESL             0x05    // shift display left one position on next data write
#define LCD_CMD_ECR             0x06    // move cursor right one position on next data write
#define LCD_CMD_ESR             0x07    // shift display right one position on next data write
#define LCD_CMD_DOFF            0x08    // display off, cursor off, blinking off
#define LCD_CMD_BL              0x09    // blink character at current cursor position
#define LCD_CMD_CUR             0x0A    // enable cursor on
#define LCD_CMD_DON             0x0C    // turn display on
#define LCD_CMD_CL              0x10    // move cursor left one position
#define LCD_CMD_SL              0x14    // shift display left one position
#define LCD_CMD_CR              0x18    // move cursor right one position
#define LCD_CMD_SR              0x1C    // shift display right one position
#define LCD_CMD_MODE            0x38    // sets 8 bits, 2 lines, 5x7 characters
#define LCD_CMD_ACG             0x40    // bits 0-5 sets the character generator address
#define LCD_CMD_ADD             0x80    // bits 0-6 sets the display data address to line 1 +

// LCD status values
#define LCD_OK                  0x00
#define LCD_ERR                 0x01

#define LCD_LINE0       0x00
#define LCD_LINE1       0x40

#define LCD_LINE_LENGTH 16

static char lcd_line0[LCD_LINE_LENGTH+1];
static char lcd_line1[LCD_LINE_LENGTH+1];
static char *lcd_line[2] = { lcd_line0, lcd_line1 };
static int lcd_curline = 0;
static int lcd_linepos = 0;


static void lcd_dis(int add, char *s, cyg_uint8* base);

static void
init_lcd_channel(cyg_uint8* base)
{
    cyg_uint8 stat;
    int i;
    
    // wait for not busy
    // Note: It seems that the LCD isn't quite ready to process commands
    // when it clears the BUSY flag. Reading the status address an extra
    // time seems to give it enough breathing room.
    do { HAL_READ_UINT8(base+LCD_STAT, stat); } while (stat & LCD_STAT_BUSY);
    HAL_READ_UINT8(base+LCD_STAT, stat);

    // configure the lcd for 8 bits/char, 2 lines
    // and 5x7 dot matrix
    HAL_WRITE_UINT8(base+LCD_CMD, LCD_CMD_MODE);

    // wait for not busy
    do { HAL_READ_UINT8(base+LCD_STAT, stat); } while (stat & LCD_STAT_BUSY);
    HAL_READ_UINT8(base+LCD_STAT, stat);

    // turn the LCD display on
    HAL_WRITE_UINT8(base+LCD_CMD, LCD_CMD_DON);

    lcd_curline = 0;
    lcd_linepos = 0;

    for( i = 0; i < LCD_LINE_LENGTH; i++ )
        lcd_line[0][i] = lcd_line[1][i] = ' ';

    lcd_line[0][LCD_LINE_LENGTH] = lcd_line[1][LCD_LINE_LENGTH] = 0;

    lcd_dis(LCD_LINE0, lcd_line[0], base);
    lcd_dis(LCD_LINE1, lcd_line[1], base);
}

// this routine writes the string to the LCD
// display after setting the address to add
static void
lcd_dis(int add, char *s, cyg_uint8* base)
{
    cyg_uint8 stat;
    int i;

    // wait for not busy (see Note in hal_diag_init above)
    do { HAL_READ_UINT8(base+LCD_STAT, stat); } while (stat & LCD_STAT_BUSY);
    HAL_READ_UINT8(base+LCD_STAT, stat);

    // write the address
    HAL_WRITE_UINT8(base+LCD_CMD, (LCD_CMD_ADD + add));

    // write the string out to the display stopping when we reach 0
    for (i = 0; *s != '\0'; i++)
    {
        // wait for not busy
        do { HAL_READ_UINT8(base+LCD_STAT, stat); } while (stat & LCD_STAT_BUSY);
        HAL_READ_UINT8(base+LCD_STAT, stat);

        // write the data
        HAL_WRITE_UINT8(base+LCD_DATA, *s++);
    }
}

void
cyg_hal_plf_lcd_putc(void* __ch_data, cyg_uint8 c)
{
    cyg_uint8* base = (cyg_uint8*)__ch_data;
    unsigned long __state;
    int i;
    CYGARC_HAL_SAVE_GP();

    // ignore CR
    if( c == '\r' ) return;
    
    HAL_DISABLE_INTERRUPTS(__state);
    if( c == '\n' )
    {
        lcd_dis(LCD_LINE0, &lcd_line[lcd_curline^1][0], base);
        lcd_dis(LCD_LINE1, &lcd_line[lcd_curline][0], base);

        // Do a line feed
        lcd_curline ^= 1;
        lcd_linepos = 0;
        
        for( i = 0; i < LCD_LINE_LENGTH; i++ )
            lcd_line[lcd_curline][i] = ' ';

        HAL_RESTORE_INTERRUPTS(__state);
        return;
    }

    // Only allow to be output if there is room on the LCD line
    if( lcd_linepos < LCD_LINE_LENGTH )
        lcd_line[lcd_curline][lcd_linepos++] = c;

    HAL_RESTORE_INTERRUPTS(__state);
}

cyg_uint8
cyg_hal_plf_lcd_getc(void* __ch_data)
{
    return 0;
}

static void
cyg_hal_plf_lcd_write(void* __ch_data, const cyg_uint8* __buf, 
                         cyg_uint32 __len)
{
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        cyg_hal_plf_lcd_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();
}

static void
cyg_hal_plf_lcd_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)
{
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        *__buf++ = cyg_hal_plf_lcd_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();
}

static int
cyg_hal_plf_lcd_control(void *__ch_data, __comm_control_cmd_t __func, ...)
{
    // Do nothing (yet).
    return 0;
}

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

    // Init channel
    init_lcd_channel((cyg_uint8*)LCD_BASE);

    // Setup procs in the vector table

    // Set channel 2
    CYGACC_CALL_IF_SET_CONSOLE_COMM(2);
    comm = CYGACC_CALL_IF_CONSOLE_PROCS();
    CYGACC_COMM_IF_CH_DATA_SET(*comm, LCD_BASE);
    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_lcd_write);
    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_lcd_read);
    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_lcd_putc);
    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_lcd_getc);
    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_lcd_control);

    // Restore original console
    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
}

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

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
#include <cyg/hal/hal_stub.h>           // CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION
#endif

//-----------------------------------------------------------------------------
// Assumption: all diagnostic output must be GDB packetized unless
// this is a configuration for a stand-alone ROM system.
#if defined(CYG_HAL_STARTUP_ROM) && !defined(CYGSEM_HAL_ROM_MONITOR)
# define HAL_DIAG_USES_HARDWARE
#endif

#if (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL == 0)
# define __BASE ((cyg_uint8*)CYG_DEV_SERIAL_BASE_A)
#elif (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL == 1)
# define __BASE ((cyg_uint8*)CYG_DEV_SERIAL_BASE_B)
#else
# error "Cannot use LCD"
#endif

static channel_data_t channel = { __BASE, 0, 0};

#ifdef HAL_DIAG_USES_HARDWARE

void hal_diag_init(void)
{
    init_serial_channel(&channel);
}

void hal_diag_write_char(char __c)
{
    cyg_hal_plf_serial_putc(&channel, __c);
}

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

#else  // ifdef HAL_DIAG_USES_HARDWARE

// Initialize diag port
void
hal_diag_init(void)
{
    // Init devices
    init_serial_channel(&channel);
}

void 
hal_diag_write_char_serial( char c )
{
    unsigned long __state;
    HAL_DISABLE_INTERRUPTS(__state);
    cyg_hal_plf_serial_putc(&channel, c);
    HAL_RESTORE_INTERRUPTS(__state);
}

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

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)
        {
            char c1;
            static char hex[] = "0123456789ABCDEF";
            cyg_uint8 csum = 0;
            int i;
        
            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.
            hal_diag_read_char(&c1);

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

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
            if( 3 == c1 ) {
                // Ctrl-C: breakpoint.
                cyg_hal_gdb_interrupt(
                    (target_register_t)__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  // ifdef HAL_DIAG_USES_HARDWARE

#endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

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