diff options
| -rw-r--r-- | software/demo_gpio/demo_gpio.c | 49 |
1 files changed, 25 insertions, 24 deletions
diff --git a/software/demo_gpio/demo_gpio.c b/software/demo_gpio/demo_gpio.c index f568ae8..dec91b5 100644 --- a/software/demo_gpio/demo_gpio.c +++ b/software/demo_gpio/demo_gpio.c @@ -49,26 +49,26 @@ void handle_m_ext_interrupt(){ 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_BASE_ADDR + CLINT_MTIME); volatile uint64_t * mtimecmp = (uint64_t*) (CLINT_BASE_ADDR + CLINT_MTIMECMP); uint64_t now = *mtime; uint64_t then = now + 1.5 * RTC_FREQUENCY; *mtimecmp = then; - + // read the current value of the LEDS and invert them. uint32_t leds = *g_output_vals; - + *g_output_vals ^= ((0x1 << RED_LED_OFFSET) | (0x1 << GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)); - + // Re-enable the timer interrupt. set_csr(mie, MIP_MTIP); - + } @@ -105,18 +105,18 @@ Every 1.5 second, the Timer Interrupt will invert the LEDs.\n\ "; void print_instructions() { - + write (STDOUT_FILENO, instructions_msg, strlen(instructions_msg)); - + } +#ifdef HAS_BOARD_BUTTONS void button_0_handler(void) { // Red LED on * g_output_vals |= (0x1 << RED_LED_OFFSET); - - // Clear the GPIO Pending interrupt by writing 1. + // Clear the GPIO Pending interrupt by writing 1. GPIO_REG(GPIO_RISE_IP) = (0x1 << BUTTON_0_OFFSET); }; @@ -126,25 +126,26 @@ void button_1_handler(void) { // Green LED On * g_output_vals |= (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 * g_output_vals |= (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. - + // Disable the machine & timer interrupts until setup is done. + clear_csr(mie, MIP_MEIP); clear_csr(mie, MIP_MTIP); @@ -157,7 +158,7 @@ void reset_demo (){ 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 @@ -172,13 +173,13 @@ void reset_demo (){ 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_BASE_ADDR + CLINT_MTIME); @@ -186,13 +187,13 @@ void reset_demo (){ uint64_t now = *mtime; uint64_t then = now + 1.5*RTC_FREQUENCY; *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); } @@ -207,7 +208,7 @@ int main(int argc, char **argv) * g_pullup_en &= ~((0x1 << BUTTON_0_OFFSET) | (0x1 << BUTTON_1_OFFSET) | (0x1 << BUTTON_2_OFFSET)); * g_input_en |= ((0x1 << BUTTON_0_OFFSET) | (0x1 << BUTTON_1_OFFSET) | (0x1 << BUTTON_2_OFFSET)); #endif - + * g_input_en &= ~((0x1<< RED_LED_OFFSET) | (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ; * g_output_en |= ((0x1<< RED_LED_OFFSET)| (0x1<< GREEN_LED_OFFSET) | (0x1 << BLUE_LED_OFFSET)) ; * g_output_vals |= (0x1 << BLUE_LED_OFFSET) ; @@ -215,7 +216,7 @@ int main(int argc, char **argv) /************************************************************************** * Set up the PLIC - * + * *************************************************************************/ PLIC_init(&g_plic, PLIC_BASE_ADDR, |