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[/] [minsoc/] [trunk/] [utils/] [contributions/] [gpio/] [sw/] [gpio.c] - Blame information for rev 83

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Line No. Rev Author Line
1 40 rfajardo 
#include "../support/support.h"
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#include "../support/board.h"
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#include "../support/spr_defs.h"
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#include "../drivers/uart.h"
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#include "gpio.h"
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void gpio_init(gpio_t *gpio, long instance_num, unsigned long base_addr)
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{
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    int i = MIN_GPIO_BIT;
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    if ( gpio != NULL ) {
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            gpio->instance_num = instance_num;
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            gpio->base_addr = (unsigned char*)base_addr;
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            for ( ;i<=MAX_GPIO_BIT;i++)
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                    gpio->vectors[i].vec = NULL;
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            return;
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    } else {
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            // Print the error msgs here
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            //
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            uart_print_str("gpio inst in NULL.\n");
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            return;
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    }
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}
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void gpio_config_bit(gpio_t *gpio, unsigned long bit, iotype_t io)
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{
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    if ( gpio != NULL ) {
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            if ( io == IO_INPUT ) {
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                gpio->io_config |= (1 << bit);
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                *(unsigned long*)(gpio->base_addr + OE_REG_OFFSET) &= (~(1 << bit));
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            } else {
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                gpio->io_config &= (~(1 << bit));
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                *(unsigned long*)(gpio->base_addr + OE_REG_OFFSET) |= (1 << bit);
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            }
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            return;
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    } else {
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            // Print the error msgs here
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            //
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            uart_print_str("gpio inst in NULL.\n");
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            return;
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    }
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}
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void gpio_set_bit(gpio_t *gpio, unsigned long bit, unsigned long val)
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{
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    if ( gpio != NULL ) {
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            if ( val != 0 )
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                *(unsigned long*)(gpio->base_addr + OUT_REG_OFFSET) |= (1 << bit);
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            else
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                *(unsigned long*)(gpio->base_addr + OUT_REG_OFFSET) &= (~(1 << bit));
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            return;
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    } else {
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            // Print the error msgs here
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            //
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            uart_print_str("gpio inst in NULL.\n");
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            return;
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    }
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}
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void gpio_get_bit(gpio_t *gpio, unsigned long bit, unsigned long *val)
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{
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    unsigned long temp;
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    if ( gpio != NULL ) {
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            temp = *(unsigned long*)(gpio->base_addr + IN_REG_OFFSET);
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            *val = (temp & (1 << bit))? 1 : 0;
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            return;
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    } else {
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            // Print the error msgs here
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            //
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            uart_print_str("gpio inst in NULL.\n");
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            return;
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    }
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}
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void gpio_add_interrupt(gpio_t *gpio, unsigned int bit, edge_t edge,void (*func)() )
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{
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    if ( gpio != NULL ) {
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        if ( ( gpio->io_config &(1 << bit)) != 0 ) {  // Port bit is configured as IO_INPUT
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                //
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                // Disable the interrupts
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                //
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                *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) &= (~0x01);
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                // Enable the interrupt bit
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                //
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                *(unsigned long*)(gpio->base_addr + INTE_REG_OFFSET) |= (1 << bit);
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                // Enable the edge type
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                //
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                if ( edge == POS_EDGE )
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                    *(unsigned long*)(gpio->base_addr + PTRIG_REG_OFFSET) |= (1 << bit);
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                else
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                    *(unsigned long*)(gpio->base_addr + PTRIG_REG_OFFSET) &= (~(1 << bit));
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                // Set the function vector
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                //
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                gpio->vectors[bit].vec = func;
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                int_add( 6, gpio_interrupt, gpio );
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                // Re-enable the global control bit
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                //
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                    *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) |= 0x01;
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        } else {
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                // Port is configured as IO_OUTPUT
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                uart_print_str("gpio pin is not an input pin.\n");
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                return;
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        }
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    } else {
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            // Print the error msgs here
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            //
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            uart_print_str("gpio inst in NULL.\n");
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            return;
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    }
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}
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void gpio_interrupt(gpio_t *gpio)
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{
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    int i;
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    unsigned long int interrupt_status;
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    if ( (*(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET)) & 0x02 )
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    {
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            // Interrupt is pending here
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            //
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            interrupt_status = *(unsigned long*)(gpio->base_addr + INTS_REG_OFFSET);
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            // Prioritize from lower bits(0) to higher ones(31)
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            //
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            for ( i=MIN_GPIO_BIT; i<=MAX_GPIO_BIT; i++ ) {
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                if ( (interrupt_status & (1<<i)) ) {
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                    *(unsigned long*)(gpio->base_addr + INTS_REG_OFFSET) &= (~( 1 << i ));
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                    (gpio->vectors[i].vec)();
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                }
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            }
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            *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) &= (~0x02);
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    }
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}
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void hello_east()
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{
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        uart_print_str("Hello from PUSH Button EAST.\n");
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}
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void hello_west()
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{
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        uart_print_str("Hello from PUSH Button WEST.\n");
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}
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void hello_south()
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{
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        uart_print_str("Hello from PUSH Button SOUTH.\n");
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}
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#define MAX_COUNT 10
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int main()
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{
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        gpio_t gpio_1;
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        unsigned long t0, t1, t2, t3;
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        unsigned long count = 0;
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        tick_init();
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        uart_init();
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        int_init();
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        int_add(2,&uart_interrupt);
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        gpio_init( &gpio_1, 1, GPIO_BASE );
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        gpio_config_bit( &gpio_1, LED_0, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_1, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_2, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_3, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_4, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_5, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_6, IO_OUTPUT);
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        gpio_config_bit( &gpio_1, LED_7, IO_OUTPUT);
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        while ( count++ < MAX_COUNT ) {
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                gpio_set_bit( &gpio_1, LED_7, 0 );
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                gpio_set_bit( &gpio_1, LED_0, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_0, 0 );
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                gpio_set_bit( &gpio_1, LED_1, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_1, 0 );
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                gpio_set_bit( &gpio_1, LED_2, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_2, 0 );
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                gpio_set_bit( &gpio_1, LED_3, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_3, 0 );
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                gpio_set_bit( &gpio_1, LED_4, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_4, 0 );
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                gpio_set_bit( &gpio_1, LED_5, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_5, 0 );
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                gpio_set_bit( &gpio_1, LED_6, 1 );
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                udelay();
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                gpio_set_bit( &gpio_1, LED_6, 0 );
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                gpio_set_bit( &gpio_1, LED_7, 1 );
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                udelay();
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        }
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        gpio_set_bit( &gpio_1, LED_7, 0 );
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        report(0xdeaddead);
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        or32_exit(0);
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}

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