diff options
| -rw-r--r-- | software/led_fade/Makefile | 6 | ||||
| -rw-r--r-- | software/led_fade/led_fade.c | 160 |
2 files changed, 166 insertions, 0 deletions
diff --git a/software/led_fade/Makefile b/software/led_fade/Makefile new file mode 100644 index 0000000..c42049b --- /dev/null +++ b/software/led_fade/Makefile @@ -0,0 +1,6 @@ +TARGET = led_fade +C_SRCS += led_fade.c +CFLAGS += -O2 -fno-builtin-printf + +BSP_BASE = ../../bsp +include $(BSP_BASE)/env/common.mk diff --git a/software/led_fade/led_fade.c b/software/led_fade/led_fade.c new file mode 100644 index 0000000..775647a --- /dev/null +++ b/software/led_fade/led_fade.c @@ -0,0 +1,160 @@ +// See LICENSE for license details. + +// This is the program which ships on the HiFive1 +// board, executing out of SPI Flash at 0x20400000. + +#include <stdint.h> +#include "platform.h" + +static const char led_msg[] = "\a\n\r\n\r\ +55555555555555555555555555555555555555555555555\n\r\ +5555555 Are the LEDs Changing? [y/n] 555555555\n\r\ +55555555555555555555555555555555555555555555555\n\r"; + +static const char sifive_msg[] = "\n\r\ +\n\r\ + SIFIVE, INC.\n\r\ +\n\r\ + 5555555555555555555555555\n\r\ + 5555 5555\n\r\ + 5555 5555\n\r\ + 5555 5555\n\r\ + 5555 5555555555555555555555\n\r\ + 5555 555555555555555555555555\n\r\ + 5555 5555\n\r\ + 5555 5555\n\r\ + 5555 5555\n\r\ +5555555555555555555555555555 55555\n\r\ + 55555 555555555 55555\n\r\ + 55555 55555 55555\n\r\ + 55555 5 55555\n\r\ + 55555 55555\n\r\ + 55555 55555\n\r\ + 55555 55555\n\r\ + 55555 55555\n\r\ + 55555 55555\n\r\ + 555555555\n\r\ + 55555\n\r\ + 5\n\r\ +\n\r\ + 'led_fade' Demo \n\r\ +\n\r"; + +static void _putc(char c) { + while ((int32_t) UART0_REG(UART_REG_TXFIFO) < 0); + UART0_REG(UART_REG_TXFIFO) = c; +} + +int _getc(char * c){ + int32_t val = (int32_t) UART0_REG(UART_REG_RXFIFO); + if (val > 0) { + *c = val & 0xFF; + return 1; + } + return 0; +} + + +static void _puts(const char * s) { + while (*s != '\0'){ + _putc(*s++); + } +} + + +int main (void){ + + // Run off 16 MHz Crystal for accuracy. + PRCI_REG(PRCI_PLLCFG) = (PLL_REFSEL(1) | PLL_BYPASS(1)); + PRCI_REG(PRCI_PLLCFG) |= (PLL_SEL(1)); + // Turn off HFROSC to save power + PRCI_REG(PRCI_HFROSCCFG) = 0; + + // Configure UART to print + GPIO_REG(GPIO_OUTPUT_VAL) |= IOF0_UART0_MASK; + GPIO_REG(GPIO_OUTPUT_EN) |= IOF0_UART0_MASK; + GPIO_REG(GPIO_IOF_SEL) &= ~IOF0_UART0_MASK; + GPIO_REG(GPIO_IOF_EN) |= IOF0_UART0_MASK; + + // 115200 Baud Rate + UART0_REG(UART_REG_DIV) = 138; + UART0_REG(UART_REG_TXCTRL) = UART_TXEN; + UART0_REG(UART_REG_RXCTRL) = UART_RXEN; + + // Wait a bit to avoid corruption on the UART. + // (In some cases, switching to the IOF can lead + // to output glitches, so need to let the UART + // reciever time out and resynchronize to the real + // start of the stream. + volatile int i=0; + while(i < 10000){i++;} + + _puts(sifive_msg); + //_puts("Config String:\n\r"); + //_puts(*((const char **) 0x100C)); + //_puts("\n\r"); + _puts(led_msg); + + uint16_t r=0xFF; + uint16_t g=0; + uint16_t b=0; + char c = 0; + + // Set up RGB PWM + + PWM1_REG(PWM_CFG) = 0; + // To balance the power consumption, make one left, one right, and one center aligned. + PWM1_REG(PWM_CFG) = (PWM_CFG_ENALWAYS) | (PWM_CFG_CMP2CENTER); + PWM1_REG(PWM_COUNT) = 0; + + // Period is approximately 244 Hz + // the LEDs are intentionally left somewhat dim, + // as the full brightness can be painful to look at. + PWM1_REG(PWM_CMP0) = 0; + + GPIO_REG(GPIO_IOF_SEL) |= ( (1 << GREEN_LED_OFFSET) | (1 << BLUE_LED_OFFSET) | (1 << RED_LED_OFFSET)); + GPIO_REG(GPIO_IOF_EN ) |= ( (1 << GREEN_LED_OFFSET) | (1 << BLUE_LED_OFFSET) | (1 << RED_LED_OFFSET)); + GPIO_REG(GPIO_OUTPUT_XOR) &= ~( (1 << GREEN_LED_OFFSET) | (1 << BLUE_LED_OFFSET)); + GPIO_REG(GPIO_OUTPUT_XOR) |= (1 << RED_LED_OFFSET); + + while(1){ + volatile uint64_t * now = (volatile uint64_t*)(CLINT_BASE_ADDR + CLINT_MTIME); + volatile uint64_t then = *now + 100; + while (*now < then) { } + + if(r > 0 && b == 0){ + r--; + g++; + } + if(g > 0 && r == 0){ + g--; + b++; + } + if(b > 0 && g == 0){ + r++; + b--; + } + + uint32_t G = g; + uint32_t R = r; + uint32_t B = b; + + PWM1_REG(PWM_CMP1) = G << 4; // PWM is low on the left, GPIO is low on the left side, LED is ON on the left. + PWM1_REG(PWM_CMP2) = (B << 1) << 4; // PWM is high on the middle, GPIO is low in the middle, LED is ON in the middle. + PWM1_REG(PWM_CMP3) = 0xFFFF - (R << 4); // PWM is low on the left, GPIO is low on the right, LED is on on the right. + + // Check for user input + if (c == 0){ + if (_getc(&c) != 0){ + _putc(c); + _puts("\n\r"); + + if ((c == 'y') || (c == 'Y')){ + _puts("PASS\n\r"); + } else{ + _puts("FAIL\n\r"); + } + } + } + } +} |