diff options
Diffstat (limited to 'software/led_fade/led_fade.c')
| -rw-r--r-- | software/led_fade/led_fade.c | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/software/led_fade/led_fade.c b/software/led_fade/led_fade.c deleted file mode 100644 index 9b50eda..0000000 --- a/software/led_fade/led_fade.c +++ /dev/null @@ -1,167 +0,0 @@ -// 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" - -#ifndef _SIFIVE_HIFIVE1_H -#error "'led_fade' is designed to run on HiFive1 and/or E300 Arty Dev Kit." -#endif - -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){ - - // Make sure the HFROSC is on before the next line: - PRCI_REG(PRCI_HFROSCCFG) |= ROSC_EN(1); - // Run off 16 MHz Crystal for accuracy. Note that the - // first line is - 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) &= ~(ROSC_EN(1)); - - // 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_CTRL_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"); - } - } - } - } -} |