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Diffstat (limited to 'software/watchdog/watchdog.c')
| -rw-r--r-- | software/watchdog/watchdog.c | 221 |
1 files changed, 0 insertions, 221 deletions
diff --git a/software/watchdog/watchdog.c b/software/watchdog/watchdog.c deleted file mode 100644 index 672ed68..0000000 --- a/software/watchdog/watchdog.c +++ /dev/null @@ -1,221 +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; - - -/** -* use mtime to wait for a specified number of ticks. -* async determins if this is a busy wait, or if -* an irq is scheduled -*/ -void mtime_wait( uint64_t ticks, uint32_t async) -{ - - volatile uint64_t * mtime = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIME); - uint64_t now = *mtime; - - //if async, schedule irq - if(async) { - volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_CTRL_ADDR + CLINT_MTIMECMP); - uint64_t then = now + ticks; - *mtimecmp = then; - set_csr(mie, MIP_MTIP); - - } else { - //else busy wait - uint64_t then = now + ticks; - while(*mtime<then) {} - - } - -} - -/*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); -} - -//global countdown timer -static uint32_t countdown = 10; -/*Entry Point for Machine Timer Interrupt Handler*/ -void handle_m_time_interrupt(){ - - //cleare the timer irq - clear_csr(mie, MIP_MTIP); - - //schedule next timer irq for 1 second - mtime_wait(1*RTC_FREQ, 1); - - //flash a led - GPIO_REG(GPIO_OUTPUT_VAL) ^= (0x1 << BLUE_LED_OFFSET); - - //print the count - printf("watchdog reset in %d\n", countdown--); -} - - -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\ -This application demonstrates the functionality of\n\ -the watchdog timer present in the HiFive1 AON peripheral.\n\ -\n\ -The Watchdog timer will expire in 10 seconds resulting in\n\ -a software reset.\n\ -\n\ -Press a key to prevent a reset\n\ -"; - -void print_instructions() { - - write (STDOUT_FILENO, instructions_msg, strlen(instructions_msg)); - -} - - -/** -* Flash the red led for a second, then set up -* blue for blinking during mtime irq -*/ -void led_init() { - - - // Set up the GPIOs such that the LED GPIO - // can be used as both Inputs and Outputs. - 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<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1<< BLUE_LED_OFFSET)); - - //flash red led to indicate reset - GPIO_REG(GPIO_OUTPUT_VAL) &= ~(0x1 << RED_LED_OFFSET) ; - mtime_wait(1*RTC_FREQ,0); - GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << RED_LED_OFFSET) ; -} - -/** -* initialize the watchdog to reset in -* 5 seconds -**/ -void watchdog_init() { - - -//reset in 10 seconds -AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE; -AON_REG(AON_WDOGCMP) = 11; -//wdogconfig: : wdogrsten | enablealways | reset to 0 | max scale -AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE; -AON_REG(AON_WDOGCFG) |= (AON_WDOGCFG_RSTEN | AON_WDOGCFG_ENALWAYS |\ - AON_WDOGCFG_ZEROCMP | AON_WDOGCFG_SCALE) ; - -} - -void reset_demo () { - - // Disable the machine & timer interrupts until setup is done. - clear_csr(mie, MIP_MEIP); - clear_csr(mie, MIP_MTIP); - - //enable uart input - UART0_REG(UART_REG_RXCTRL) = UART_RXEN; - - /************************************************************************** - * Set up the PLIC - *************************************************************************/ - PLIC_init(&g_plic, - PLIC_CTRL_ADDR, - PLIC_NUM_INTERRUPTS, - PLIC_NUM_PRIORITIES); - - for (int ii = 0; ii < PLIC_NUM_INTERRUPTS; ii ++){ - g_ext_interrupt_handlers[ii] = no_interrupt_handler; - } - - - led_init(); - print_instructions(); - watchdog_init(); - - // Enable the Machine-External bit in MIE - set_csr(mie, MIP_MEIP); - // Enable interrupts in general. - set_csr(mstatus, MSTATUS_MIE); -} - -int main(int argc, char **argv) -{ - - reset_demo(); - //schedule a 1 second timer - mtime_wait(1*RTC_FREQ,1); - - - while (1){ - char c; - if(((int32_t) UART0_REG(UART_REG_RXFIFO)) > 0){ - //flash green led to indicate Kick - GPIO_REG(GPIO_OUTPUT_VAL) &= ~(0x1 << GREEN_LED_OFFSET) ; - - printf("Feeding Watchdog.\nHiFive1 will reset in 10 seconds.\n"); - countdown = 10; - AON_REG(AON_WDOGKEY) = AON_WDOGKEY_VALUE; - AON_REG(AON_WDOGFEED) = AON_WDOGFEED_VALUE; - - //busy wait a bit so the user sees the led blink - mtime_wait(5000, 0); - //turn off led - GPIO_REG(GPIO_OUTPUT_VAL) |= (0x1 << GREEN_LED_OFFSET) ; - } - } - - return 0; - -} |