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multitasking in ARM7

mark bond over 15 years ago

hello,

can I do multitasking in ARM LPC2148.
I want to display on LCD, LED and 7segment at the same time.

is it possible?????

Parents

0 John Linq over 15 years ago in reply to John Linq

void GPIO8LED_show(void)
{
        static BYTE GPIO8LED_on = 1;
        static BYTE GPIO8LED_i = 0;

        if ( ( timer_GPIO8LED == 0 ) && ( GPIO8LED_show_on ) )
        {
                if (GPIO8LED_on)
                {
                        IOSET1 = ~( LED8SET & ( 7 << (18+GPIO8LED_i) ) );
                }
                else
                {
                        IOCLR1 = LED8SET & ( 7 << (18+GPIO8LED_i) );
                        if ( GPIO8LED_i == 7 )
                                { GPIO8LED_i = 0; }
                        else
                                { GPIO8LED_i++; }
                }
                GPIO8LED_on = 1 - GPIO8LED_on;
                timer_GPIO8LED = 8;
        }
}


void MSPI_init(void)
{
        //PINSEL0 = (PINSEL0 & 0xFFFF00FF) | 0x00005500;    // Connect SPI
        PINSEL0 = (PINSEL0 & (~(0xFF << 8))) | (0x55 << 8) ;
        IODIR0  = HC595_CS;
    S0SPCCR = 0x52;                         // Set SPI Clock
        S0SPCR  = (0 << 3) |                      // CPHA = 0, [del]
                          (1 << 4) |                      // CPOL = 1, SCK [del]
                          (1 << 5) |                      // MSTR = 1, SPI [del]
                          (0 << 6) |                      // LSBF = 0, SPI [del]
                          (0 << 7);                               // SPIE = 0, [del]
}


void MSPI7LED_show(void)
{
        static BYTE MSPI7LED_i = 0;
        BYTE const HEX_TAB[16] = {
        //     0     1     2     3     4     5     6     7     8     9
                0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90,
        //         A     b     C     d     E     F
                0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E };

        if ( ( timer_MSPI7LED == 0 ) && ( MSPI7LED_show_on ) )
        {
                IOCLR0 = HC595_CS;                              // 74HC595
                SPI_SPDR = HEX_TAB[MSPI7LED_i];
                while( 0 == (SPI_SPSR & 0x80) );            // Wait
                IOSET0 = HC595_CS;
                if ( MSPI7LED_i == 15 )
                        { MSPI7LED_i = 0; }
                else
                        { MSPI7LED_i++; }
                timer_MSPI7LED = 95;
        }
}

Reply

0 John Linq over 15 years ago in reply to John Linq

void GPIO8LED_show(void)
{
        static BYTE GPIO8LED_on = 1;
        static BYTE GPIO8LED_i = 0;

        if ( ( timer_GPIO8LED == 0 ) && ( GPIO8LED_show_on ) )
        {
                if (GPIO8LED_on)
                {
                        IOSET1 = ~( LED8SET & ( 7 << (18+GPIO8LED_i) ) );
                }
                else
                {
                        IOCLR1 = LED8SET & ( 7 << (18+GPIO8LED_i) );
                        if ( GPIO8LED_i == 7 )
                                { GPIO8LED_i = 0; }
                        else
                                { GPIO8LED_i++; }
                }
                GPIO8LED_on = 1 - GPIO8LED_on;
                timer_GPIO8LED = 8;
        }
}


void MSPI_init(void)
{
        //PINSEL0 = (PINSEL0 & 0xFFFF00FF) | 0x00005500;    // Connect SPI
        PINSEL0 = (PINSEL0 & (~(0xFF << 8))) | (0x55 << 8) ;
        IODIR0  = HC595_CS;
    S0SPCCR = 0x52;                         // Set SPI Clock
        S0SPCR  = (0 << 3) |                      // CPHA = 0, [del]
                          (1 << 4) |                      // CPOL = 1, SCK [del]
                          (1 << 5) |                      // MSTR = 1, SPI [del]
                          (0 << 6) |                      // LSBF = 0, SPI [del]
                          (0 << 7);                               // SPIE = 0, [del]
}


void MSPI7LED_show(void)
{
        static BYTE MSPI7LED_i = 0;
        BYTE const HEX_TAB[16] = {
        //     0     1     2     3     4     5     6     7     8     9
                0xC0, 0xF9, 0xA4, 0xB0, 0x99, 0x92, 0x82, 0xF8, 0x80, 0x90,
        //         A     b     C     d     E     F
                0x88, 0x83, 0xC6, 0xA1, 0x86, 0x8E };

        if ( ( timer_MSPI7LED == 0 ) && ( MSPI7LED_show_on ) )
        {
                IOCLR0 = HC595_CS;                              // 74HC595
                SPI_SPDR = HEX_TAB[MSPI7LED_i];
                while( 0 == (SPI_SPSR & 0x80) );            // Wait
                IOSET0 = HC595_CS;
                if ( MSPI7LED_i == 15 )
                        { MSPI7LED_i = 0; }
                else
                        { MSPI7LED_i++; }
                timer_MSPI7LED = 95;
        }
}

Children

0 John Linq over 15 years ago in reply to John Linq

void Timer0Handler (void) __irq
{
  timer_counter++;

  if ( timer_KEYpress != 0 )
    timer_KEYpress--;
  else
    KEYS_check();

  if ( timer_GPIO8LED != 0 )
    timer_GPIO8LED--;

  if ( timer_MSPI7LED != 0 )
    timer_MSPI7LED--;

  T0IR = 1;                     /* clear interrupt flag */
  VICVectAddr = 0;              /* Acknowledge Interrupt */
}

0 John Linq over 15 years ago in reply to John Linq

The above code which I posted, is a [low quality] demonstration for:
A simple supervisory loop processing each module would almost certainly be sufficient.
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