diff options
Diffstat (limited to 'software/demo_gpio/demo_gpio.c')
| -rw-r--r-- | software/demo_gpio/demo_gpio.c | 40 |
1 files changed, 25 insertions, 15 deletions
diff --git a/software/demo_gpio/demo_gpio.c b/software/demo_gpio/demo_gpio.c index bfa388e..8fe03e1 100644 --- a/software/demo_gpio/demo_gpio.c +++ b/software/demo_gpio/demo_gpio.c @@ -9,8 +9,6 @@ #include <unistd.h> #include "stdatomic.h" -#define RTC_FREQUENCY 32768 - void reset_demo (void); // Structures for registering different interrupt handlers @@ -48,10 +46,10 @@ void handle_m_time_interrupt(){ // Reset the timer for 3s in the future. // This also clears the existing timer interrupt. - volatile uint64_t * mtime = (uint64_t*) (CLINT_BASE_ADDR + CLINT_MTIME); - volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_BASE_ADDR + CLINT_MTIMECMP); + 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 + 1.5 * RTC_FREQUENCY; + uint64_t then = now + 2 * RTC_FREQ; *mtimecmp = then; // read the current value of the LEDS and invert them. @@ -94,7 +92,7 @@ const char * instructions_msg = " \ 5\n\ \n\ SiFive E-Series Software Development Kit 'demo_gpio' program.\n\ -Every 1.5 second, the Timer Interrupt will invert the LEDs.\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\ @@ -179,10 +177,10 @@ void reset_demo (){ // Set the machine timer to go off in 3 seconds. // The - volatile uint64_t * mtime = (uint64_t*) (CLINT_BASE_ADDR + CLINT_MTIME); - volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_BASE_ADDR + CLINT_MTIMECMP); + 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 + 1.5*RTC_FREQUENCY; + uint64_t then = now + 2*RTC_FREQ; *mtimecmp = then; // Enable the Machine-External bit in MIE @@ -199,6 +197,7 @@ 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)); @@ -211,15 +210,26 @@ int main(int argc, char **argv) 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. - GPIO_REG(GPIO_OUTPUT_EN) |= (0x1 << PIN_19_OFFSET); - + + 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_BASE_ADDR, + PLIC_CTRL_ADDR, PLIC_NUM_INTERRUPTS, PLIC_NUM_PRIORITIES); @@ -231,10 +241,10 @@ int main(int argc, char **argv) * the entire OUTPUT_VAL that you want to write, but * Atomics give a quick way to control a single bit. *************************************************************************/ - uint32_t mask = (1 << PIN_19_OFFSET); - + // For Bit-banging with Atomics demo. + while (1){ - atomic_fetch_xor_explicit(&GPIO_REG(GPIO_OUTPUT_VAL), mask, memory_order_relaxed); + atomic_fetch_xor_explicit(&GPIO_REG(GPIO_OUTPUT_VAL), bitbang_mask, memory_order_relaxed); } return 0; |