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[/] [minsoc/] [branches/] [rc-1.0/] [utils/] [contributions/] [gpio/] [sw/] [gpio.c] - Rev 135
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#include "../support/support.h" #include "../support/board.h" #include "../support/spr_defs.h" #include "../drivers/uart.h" #include "gpio.h" void gpio_init(gpio_t *gpio, long instance_num, unsigned long base_addr) { int i = MIN_GPIO_BIT; if ( gpio != NULL ) { gpio->instance_num = instance_num; gpio->base_addr = (unsigned char*)base_addr; for ( ;i<=MAX_GPIO_BIT;i++) gpio->vectors[i].vec = NULL; return; } else { // Print the error msgs here // uart_print_str("gpio inst in NULL.\n"); return; } } void gpio_config_bit(gpio_t *gpio, unsigned long bit, iotype_t io) { if ( gpio != NULL ) { if ( io == IO_INPUT ) { gpio->io_config |= (1 << bit); *(unsigned long*)(gpio->base_addr + OE_REG_OFFSET) &= (~(1 << bit)); } else { gpio->io_config &= (~(1 << bit)); *(unsigned long*)(gpio->base_addr + OE_REG_OFFSET) |= (1 << bit); } return; } else { // Print the error msgs here // uart_print_str("gpio inst in NULL.\n"); return; } } void gpio_set_bit(gpio_t *gpio, unsigned long bit, unsigned long val) { if ( gpio != NULL ) { if ( val != 0 ) *(unsigned long*)(gpio->base_addr + OUT_REG_OFFSET) |= (1 << bit); else *(unsigned long*)(gpio->base_addr + OUT_REG_OFFSET) &= (~(1 << bit)); return; } else { // Print the error msgs here // uart_print_str("gpio inst in NULL.\n"); return; } } void gpio_get_bit(gpio_t *gpio, unsigned long bit, unsigned long *val) { unsigned long temp; if ( gpio != NULL ) { temp = *(unsigned long*)(gpio->base_addr + IN_REG_OFFSET); *val = (temp & (1 << bit))? 1 : 0; return; } else { // Print the error msgs here // uart_print_str("gpio inst in NULL.\n"); return; } } void gpio_add_interrupt(gpio_t *gpio, unsigned int bit, edge_t edge,void (*func)() ) { if ( gpio != NULL ) { if ( ( gpio->io_config &(1 << bit)) != 0 ) { // Port bit is configured as IO_INPUT // // Disable the interrupts // *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) &= (~0x01); // Enable the interrupt bit // *(unsigned long*)(gpio->base_addr + INTE_REG_OFFSET) |= (1 << bit); // Enable the edge type // if ( edge == POS_EDGE ) *(unsigned long*)(gpio->base_addr + PTRIG_REG_OFFSET) |= (1 << bit); else *(unsigned long*)(gpio->base_addr + PTRIG_REG_OFFSET) &= (~(1 << bit)); // Set the function vector // gpio->vectors[bit].vec = func; int_add( 6, gpio_interrupt, gpio ); // Re-enable the global control bit // *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) |= 0x01; } else { // Port is configured as IO_OUTPUT uart_print_str("gpio pin is not an input pin.\n"); return; } } else { // Print the error msgs here // uart_print_str("gpio inst in NULL.\n"); return; } } void gpio_interrupt(gpio_t *gpio) { int i; unsigned long int interrupt_status; if ( (*(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET)) & 0x02 ) { // Interrupt is pending here // interrupt_status = *(unsigned long*)(gpio->base_addr + INTS_REG_OFFSET); // Prioritize from lower bits(0) to higher ones(31) // for ( i=MIN_GPIO_BIT; i<=MAX_GPIO_BIT; i++ ) { if ( (interrupt_status & (1<<i)) ) { *(unsigned long*)(gpio->base_addr + INTS_REG_OFFSET) &= (~( 1 << i )); (gpio->vectors[i].vec)(); } } *(unsigned long*)(gpio->base_addr + CTRL_REG_OFFSET) &= (~0x02); } } void hello_east() { uart_print_str("Hello from PUSH Button EAST.\n"); } void hello_west() { uart_print_str("Hello from PUSH Button WEST.\n"); } void hello_south() { uart_print_str("Hello from PUSH Button SOUTH.\n"); } #define MAX_COUNT 10 int main() { gpio_t gpio_1; unsigned long t0, t1, t2, t3; unsigned long count = 0; tick_init(); uart_init(); int_init(); int_add(2,&uart_interrupt); gpio_init( &gpio_1, 1, GPIO_BASE ); gpio_config_bit( &gpio_1, LED_0, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_1, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_2, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_3, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_4, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_5, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_6, IO_OUTPUT); gpio_config_bit( &gpio_1, LED_7, IO_OUTPUT); while ( count++ < MAX_COUNT ) { gpio_set_bit( &gpio_1, LED_7, 0 ); gpio_set_bit( &gpio_1, LED_0, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_0, 0 ); gpio_set_bit( &gpio_1, LED_1, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_1, 0 ); gpio_set_bit( &gpio_1, LED_2, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_2, 0 ); gpio_set_bit( &gpio_1, LED_3, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_3, 0 ); gpio_set_bit( &gpio_1, LED_4, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_4, 0 ); gpio_set_bit( &gpio_1, LED_5, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_5, 0 ); gpio_set_bit( &gpio_1, LED_6, 1 ); udelay(); gpio_set_bit( &gpio_1, LED_6, 0 ); gpio_set_bit( &gpio_1, LED_7, 1 ); udelay(); } gpio_set_bit( &gpio_1, LED_7, 0 ); report(0xdeaddead); or32_exit(0); }
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