summaryrefslogtreecommitdiff
path: root/software/demo_gpio/demo_gpio.c
diff options
context:
space:
mode:
Diffstat (limited to 'software/demo_gpio/demo_gpio.c')
-rw-r--r--software/demo_gpio/demo_gpio.c252
1 files changed, 0 insertions, 252 deletions
diff --git a/software/demo_gpio/demo_gpio.c b/software/demo_gpio/demo_gpio.c
deleted file mode 100644
index 8fe03e1..0000000
--- a/software/demo_gpio/demo_gpio.c
+++ /dev/null
@@ -1,252 +0,0 @@
-// See LICENSE for license details.
-
-#include <stdio.h>
-#include <stdlib.h>
-#include "platform.h"
-#include <string.h>
-#include "plic/plic_driver.h"
-#include "encoding.h"
-#include <unistd.h>
-#include "stdatomic.h"
-
-void reset_demo (void);
-
-// Structures for registering different interrupt handlers
-// for different parts of the application.
-typedef void (*function_ptr_t) (void);
-
-void no_interrupt_handler (void) {};
-
-function_ptr_t g_ext_interrupt_handlers[PLIC_NUM_INTERRUPTS];
-
-
-// Instance data for the PLIC.
-
-plic_instance_t g_plic;
-
-
-/*Entry Point for PLIC Interrupt Handler*/
-void handle_m_ext_interrupt(){
- plic_source int_num = PLIC_claim_interrupt(&g_plic);
- if ((int_num >=1 ) && (int_num < PLIC_NUM_INTERRUPTS)) {
- g_ext_interrupt_handlers[int_num]();
- }
- else {
- exit(1 + (uintptr_t) int_num);
- }
- PLIC_complete_interrupt(&g_plic, int_num);
-}
-
-
-/*Entry Point for Machine Timer Interrupt Handler*/
-void handle_m_time_interrupt(){
-
- clear_csr(mie, MIP_MTIP);
-
- // Reset the timer for 3s in the future.
- // This also clears the existing timer interrupt.
-
- volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME);
- volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIMECMP);
- uint64_t now = *mtime;
- uint64_t then = now + 2 * RTC_FREQ;
- *mtimecmp = then;
-
- // read the current value of the LEDS and invert them.
- uint32_t leds = GPIO_REG(GPIO_OUTPUT_VAL);
-
- GPIO_REG(GPIO_OUTPUT_VAL) ^= ((0x1 << RED_LED_OFFSET) |
- (0x1 << GREEN_LED_OFFSET) |
- (0x1 << BLUE_LED_OFFSET));
-
- // Re-enable the timer interrupt.
- set_csr(mie, MIP_MTIP);
-
-}
-
-
-const char * instructions_msg = " \
-\n\
- SIFIVE, INC.\n\
-\n\
- 5555555555555555555555555\n\
- 5555 5555\n\
- 5555 5555\n\
- 5555 5555\n\
- 5555 5555555555555555555555\n\
- 5555 555555555555555555555555\n\
- 5555 5555\n\
- 5555 5555\n\
- 5555 5555\n\
-5555555555555555555555555555 55555\n\
- 55555 555555555 55555\n\
- 55555 55555 55555\n\
- 55555 5 55555\n\
- 55555 55555\n\
- 55555 55555\n\
- 55555 55555\n\
- 55555 55555\n\
- 55555 55555\n\
- 555555555\n\
- 55555\n\
- 5\n\
-\n\
-SiFive E-Series Software Development Kit 'demo_gpio' program.\n\
-Every 2 second, the Timer Interrupt will invert the LEDs.\n\
-(Arty Dev Kit Only): Press Buttons 0, 1, 2 to Set the LEDs.\n\
-Pin 19 (HiFive1) or A5 (Arty Dev Kit) is being bit-banged\n\
-for GPIO speed demonstration.\n\
-\n\
- ";
-
-void print_instructions() {
-
- write (STDOUT_FILENO, instructions_msg, strlen(instructions_msg));
-
-}
-
-#ifdef HAS_BOARD_BUTTONS
-void button_0_handler(void) {
-
- // Red LED on
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << RED_LED_OFFSET);
-
- // Clear the GPIO Pending interrupt by writing 1.
- GPIO_REG(GPIO_RISE_IP) = (0x1 << BUTTON_0_OFFSET);
-
-};
-
-void button_1_handler(void) {
-
- // Green LED On
- GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << GREEN_LED_OFFSET);
-
- // Clear the GPIO Pending interrupt by writing 1.
- GPIO_REG(GPIO_RISE_IP) = (0x1 << BUTTON_1_OFFSET);
-
-};
-
-
-void button_2_handler(void) {
-
- // Blue LED On
- GPIO_REG(GPIO_OUTPUT_VAL) |= (1 << BLUE_LED_OFFSET);
-
- GPIO_REG(GPIO_RISE_IP) = (0x1 << BUTTON_2_OFFSET);
-
-};
-#endif
-
-void reset_demo (){
-
- // Disable the machine & timer interrupts until setup is done.
-
- clear_csr(mie, MIP_MEIP);
- clear_csr(mie, MIP_MTIP);
-
- for (int ii = 0; ii < PLIC_NUM_INTERRUPTS; ii ++){
- g_ext_interrupt_handlers[ii] = no_interrupt_handler;
- }
-
-#ifdef HAS_BOARD_BUTTONS
- g_ext_interrupt_handlers[INT_DEVICE_BUTTON_0] = button_0_handler;
- g_ext_interrupt_handlers[INT_DEVICE_BUTTON_1] = button_1_handler;
- g_ext_interrupt_handlers[INT_DEVICE_BUTTON_2] = button_2_handler;
-#endif
-
- print_instructions();
-
-#ifdef HAS_BOARD_BUTTONS
-
- // Have to enable the interrupt both at the GPIO level,
- // and at the PLIC level.
- PLIC_enable_interrupt (&g_plic, INT_DEVICE_BUTTON_0);
- PLIC_enable_interrupt (&g_plic, INT_DEVICE_BUTTON_1);
- PLIC_enable_interrupt (&g_plic, INT_DEVICE_BUTTON_2);
-
- // Priority must be set > 0 to trigger the interrupt.
- PLIC_set_priority(&g_plic, INT_DEVICE_BUTTON_0, 1);
- PLIC_set_priority(&g_plic, INT_DEVICE_BUTTON_1, 1);
- PLIC_set_priority(&g_plic, INT_DEVICE_BUTTON_2, 1);
-
- GPIO_REG(GPIO_RISE_IE) |= (1 << BUTTON_0_OFFSET);
- GPIO_REG(GPIO_RISE_IE) |= (1 << BUTTON_1_OFFSET);
- GPIO_REG(GPIO_RISE_IE) |= (1 << BUTTON_2_OFFSET);
-
-#endif
-
- // Set the machine timer to go off in 3 seconds.
- // The
- volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME);
- volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIMECMP);
- uint64_t now = *mtime;
- uint64_t then = now + 2*RTC_FREQ;
- *mtimecmp = then;
-
- // Enable the Machine-External bit in MIE
- set_csr(mie, MIP_MEIP);
-
- // Enable the Machine-Timer bit in MIE
- set_csr(mie, MIP_MTIP);
-
- // Enable interrupts in general.
- set_csr(mstatus, MSTATUS_MIE);
-}
-
-int main(int argc, char **argv)
-{
- // Set up the GPIOs such that the LED GPIO
- // can be used as both Inputs and Outputs.
-
-
-#ifdef HAS_BOARD_BUTTONS
- GPIO_REG(GPIO_OUTPUT_EN) &= ~((0x1 << BUTTON_0_OFFSET) | (0x1 << BUTTON_1_OFFSET) | (0x1 << BUTTON_2_OFFSET));
- GPIO_REG(GPIO_PULLUP_EN) &= ~((0x1 << BUTTON_0_OFFSET) | (0x1 << BUTTON_1_OFFSET) | (0x1 << BUTTON_2_OFFSET));
- GPIO_REG(GPIO_INPUT_EN) |= ((0x1 << BUTTON_0_OFFSET) | (0x1 << BUTTON_1_OFFSET) | (0x1 << BUTTON_2_OFFSET));
-#endif
-
- GPIO_REG(GPIO_INPUT_EN) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ;
- GPIO_REG(GPIO_OUTPUT_EN) |= ((0x1<< RED_LED_OFFSET)| (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ;
- GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << BLUE_LED_OFFSET) ;
- GPIO_REG(GPIO_OUTPUT_VAL) &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET)) ;
-
-
- // For Bit-banging with Atomics demo.
-
- uint32_t bitbang_mask = 0;
-#ifdef _SIFIVE_HIFIVE1_H
- bitbang_mask = (1 << PIN_19_OFFSET);
-#else
-#ifdef _SIFIVE_COREPLEXIP_ARTY_H
- bitbang_mask = (0x1 << JA_0_OFFSET);
-#endif
-#endif
-
- GPIO_REG(GPIO_OUTPUT_EN) |= bitbang_mask;
-
- /**************************************************************************
- * Set up the PLIC
- *
- *************************************************************************/
- PLIC_init(&g_plic,
- PLIC_CTRL_ADDR,
- PLIC_NUM_INTERRUPTS,
- PLIC_NUM_PRIORITIES);
-
- reset_demo();
-
- /**************************************************************************
- * Demonstrate fast GPIO bit-banging.
- * One can bang it faster than this if you know
- * the entire OUTPUT_VAL that you want to write, but
- * Atomics give a quick way to control a single bit.
- *************************************************************************/
- // For Bit-banging with Atomics demo.
-
- while (1){
- atomic_fetch_xor_explicit(&GPIO_REG(GPIO_OUTPUT_VAL), bitbang_mask, memory_order_relaxed);
- }
-
- return 0;
-
-}
generated by cgit v1.2.1-18-gbd029 (git 2.20.0) at 2024-05-19 22:34:00 +0000