/* * This file is part of the libopencm3 project. * * Copyright (C) 2011 Piotr Esden-Tempski * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ /* * This example is implementing the protocol of ZJ168 addressable led * strips. These strips use the LPD6803 controller. You may be able to * find the datasheet here: * http://www.adafruit.com/datasheets/LPD6803.pdf */ #include #include #include #define SPI_BANK GPIOB #define SCLK_PIN GPIO13 #define MOSI_PIN GPIO15 #define SMALL_DELAY_VALUE 0 #define COLOR_COUNT 50 #define SCLK(VAL) \ if (VAL) { \ gpio_set(SPI_BANK, SCLK_PIN); \ } else { \ gpio_clear(SPI_BANK, SCLK_PIN); \ } #define MOSI(VAL) \ if (VAL) { \ gpio_set(SPI_BANK, MOSI_PIN); \ } else { \ gpio_clear(SPI_BANK, MOSI_PIN); \ } #define SMALL_DELAY() { \ int j; \ for (j = 0; j < SMALL_DELAY_VALUE; j++) \ __asm__("nop"); \ } struct color { u8 r; u8 g; u8 b; }; /* Set STM32 to 72 MHz. */ void clock_setup(void) { rcc_clock_setup_in_hse_8mhz_out_72mhz(); /* Enable GPIOC clock. */ rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN); rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN); } void gpio_setup(void) { /* Set GPIO12 (in GPIO port C) to 'output push-pull'. */ gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO12); gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13); gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO15); } void send_colors(struct color *colors, int count) { int i, k; /* initialize spi pins */ SCLK(0); MOSI(0); /* start frame */ for (i=0; i<32; i++) { SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); } /* color cell output */ for (k = 0; k < count; k++) { /* Start bit */ MOSI(1); SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); /* Blue */ for (i=0; i<5; i++) { MOSI(((colors[k].b & ((1 << 4) >> i)) != 0)); SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); } /* Red */ for (i=0; i<5; i++) { MOSI(((colors[k].r & ((1 << 4) >> i)) != 0)); SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); } /* Green */ for (i=0; i<5; i++) { MOSI(((colors[k].g & ((1 << 4) >> i)) != 0)); SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); } } /* End frame */ MOSI(0); for (k=0; k < count; k++) { SCLK(1); SMALL_DELAY(); SCLK(0); SMALL_DELAY(); } } void reset_colors(struct color *colors, int count) { int i; for (i=0; i