diff options
| -rw-r--r-- | software/clic_vectored/clic_vectored.c | 68 |
1 files changed, 52 insertions, 16 deletions
diff --git a/software/clic_vectored/clic_vectored.c b/software/clic_vectored/clic_vectored.c index db2435d..38a564e 100644 --- a/software/clic_vectored/clic_vectored.c +++ b/software/clic_vectored/clic_vectored.c @@ -1,5 +1,4 @@ // See LICENSE for license details. - #include <stdio.h> #include <stdlib.h> #include "platform.h" @@ -8,6 +7,7 @@ #include <unistd.h> #include "sifive/devices/clic.h" #include "clic/clic_driver.h" +#include "sifive/devices/clint.h" #ifndef _SIFIVE_COREPLEXIP_ARTY_H #error 'local_interrupts' demo only supported for Core IP Eval Kits @@ -27,31 +27,34 @@ clic_instance_t clic; const char * instructions_msg = " \ \n\ - SiFive, Inc\n\ - E21 Core IP Eval Kit 'clic_interrupts' demo.\n\ + SiFive, Inc\n\ + E21 Core IP Eval Kit 'clic_vectored' demo.\n\ + This demo uses buttons 0, 1, and 2 on the\n\ + Arty board to trigger vectored clic interrupts.\n\ \n\ -The Buttons 0-3 and Switch 3 are enabled as local\n\ -interrupts sources. A .5 s 'debounce' timer is used \n\ -between these interrupts. Software interrupts are\n\ -used to print a message while debouncing.\n\ -Note the priority of the interrupts sources.\n\ \n"; void print_instructions() { + write (STDERR_FILENO, instructions_msg, strlen(instructions_msg)); +} - //write (STDERR_FILENO, instructions_msg, strlen(instructions_msg)); - printf(instructions_msg); +//busy wait for the specified time +void wait_ms(uint64_t ms) { + static const uint64_t ms_tick = RTC_FREQ/1000; + volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME); + uint64_t then = (ms_tick * ms) + *mtime; + while(*mtime<then); } void button_0_isr(void) __attribute__((interrupt)); void button_0_isr(void) { // Toggle Red LED - - const char button_0_msg[] = "Button 0 was pressed. Toggle Red.\n"; - write (STDOUT_FILENO, button_0_msg, strlen(button_0_msg)); + printf("Button 0 was pressed. Toggle Red.\n"); + GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << RED_LED_OFFSET); + wait_ms(500); + clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_0)); GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << RED_LED_OFFSET); - clic_clear_pending(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_0)); } void button_0_setup(void) { @@ -59,6 +62,36 @@ void button_0_setup(void) { clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_0)); } +void button_1_isr(void) __attribute__((interrupt)); +void button_1_isr(void) { + // Toggle Red LED + printf("Button 1 was pressed. Toggle Blue.\n"); + GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << BLUE_LED_OFFSET); + wait_ms(500); + clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_1)); + GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << BLUE_LED_OFFSET); +} + +void button_1_setup(void) { + clic_install_handler(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_1), button_1_isr); + clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_1)); +} + +void button_2_isr(void) __attribute__((interrupt)); +void button_2_isr(void) { + // Toggle Red LED + printf("Button 2 was pressed. Toggle Green.\n"); + GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << GREEN_LED_OFFSET); + wait_ms(500); + clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_2)); + GPIO_REG(GPIO_OUTPUT_VAL) = GPIO_REG(GPIO_OUTPUT_VAL) ^ (0x1 << GREEN_LED_OFFSET); +} + +void button_2_setup(void) { + clic_install_handler(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_2), button_2_isr); + clic_enable_interrupt(&clic, (LOCALINTIDBASE + LOCAL_INT_BTN_2)); +} + void config_gpio() { // Configure LEDs as outputs. GPIO_REG(GPIO_INPUT_EN) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ; @@ -72,16 +105,19 @@ int main(int argc, char **argv) clear_csr(mie, IRQ_M_SOFT); clear_csr(mie, IRQ_M_TIMER); - + //initialize clic registers and vector table clic_init(&clic, CLIC_HART0_ADDR, (interrupt_function_ptr_t*)localISR, default_handler, CLIC_NUM_INTERRUPTS, CLIC_NUM_CONFIG_BITS); - + //initialize gpio and buttons. + //each button registers an interrupt handler config_gpio(); button_0_setup(); + button_1_setup(); + button_2_setup(); // Enable all global interrupts set_csr(mstatus, MSTATUS_MIE); |