Added an example for STM32-H103 eval board to drive the ZJ168 addressable led strips, using the LPD6803 controller.

examples/stm32/stm32-h103/Makefile

@@ -24,7 +24,7 @@ Q := @
 MAKEFLAGS += --no-print-directory
 endif
 
-all: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf timer usb_cdcacm usb_hid button exti_both traceswo
+all: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf timer usb_cdcacm usb_hid button exti_both traceswo led_stripe
 
 miniblink:
 	@printf "  BUILD   examples/stm32/stm32-h103/miniblink\n"
@@ -78,6 +78,10 @@ traceswo:
 	@printf "  BUILD   examples/stm32/stm32-h103/traceswo\n"
 	$(Q)$(MAKE) -C traceswo
 
+led_stripe:
+	@printf "  BUILD   examples/stm32/stm32-h103/led_stripe\n"
+	$(Q)$(MAKE) -C led_stripe
+
 clean:
 	@printf "  CLEAN   examples/stm32/stm32-h103/miniblink\n"
 	$(Q)$(MAKE) -C miniblink clean
@@ -103,6 +107,8 @@ clean:
 	$(Q)$(MAKE) -C exti_both clean
 	@printf "  CLEAN   examples/stm32/stm32-h103/traceswo\n"
 	$(Q)$(MAKE) -C traceswo clean
+	@printf "  CLEAN   examples/stm32/stm32-h103/led_stripe\n"
+	$(Q)$(MAKE) -C led_stripe clean
 
-.PHONY: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf timer spi usb_cdcacm usb_hid button exti_both traceswo clean
+.PHONY: miniblink fancyblink usart usart_irq usart_printf usart_irq_printf timer spi usb_cdcacm usb_hid button exti_both traceswo led_stripe clean
 

examples/stm32/stm32-h103/led_stripe/Makefile

@@ -0,0 +1,23 @@
+##
+## This file is part of the libopencm3 project.
+##
+## Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+##
+## 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 <http://www.gnu.org/licenses/>.
+##
+
+BINARY = led_stripe
+
+include ../../Makefile.include
+

examples/stm32/stm32-h103/led_stripe/led_stripe.c

@@ -0,0 +1,226 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2011 Piotr Esden-Tempski <piotr@esden.net>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+/*
+ * 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 <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+#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<count; i++) {
+		colors[i].r = 0;
+		colors[i].g = 0;
+		colors[i].b = 0;
+	}
+}
+
+void init_colors(struct color *colors, int count) {
+	int i;
+
+	colors[0].r = 0x1F;
+	colors[0].g = 0;
+	colors[0].b = 0;
+	colors[1].r = 0;
+	colors[1].g = 0x1F;
+	colors[1].b = 0;
+	colors[2].r = 0;
+	colors[2].g = 0;
+	colors[2].b = 0x1F;
+
+}
+
+void step_colors(struct color *colors, int count) {
+	int i;
+	struct color tmp_color1;
+	struct color tmp_color2;
+
+	/* generate next colors */
+	tmp_color1.r = colors[0].r;
+	tmp_color1.g = colors[0].g;
+	tmp_color1.b = colors[0].b;
+	colors[0].r = colors[count-1].r;
+	colors[0].g = colors[count-1].g;
+	colors[0].b = colors[count-1].b;
+	for(i=1; i<count; i++) {
+		tmp_color2.r = colors[i].r;
+		tmp_color2.g = colors[i].g;
+		tmp_color2.b = colors[i].b;
+		colors[i].r = tmp_color1.r;
+		colors[i].g = tmp_color1.g;
+		colors[i].b = tmp_color1.b;
+		tmp_color1.r = tmp_color2.r;
+		tmp_color1.g = tmp_color2.g;
+		tmp_color1.b = tmp_color2.b;
+	}
+}
+
+int main(void)
+{
+	int i;
+
+	struct color colors[COLOR_COUNT];
+
+	clock_setup();
+	gpio_setup();
+
+	reset_colors(colors, COLOR_COUNT);
+	init_colors(colors, COLOR_COUNT);
+
+	while (1) {
+		gpio_toggle(GPIOC, GPIO12);	/* LED on/off */
+
+		send_colors(colors, COLOR_COUNT);
+
+		step_colors(colors, COLOR_COUNT);
+
+		/* Wait a little */
+		for (i = 0; i < 500000; i++)	/* Wait a bit. */
+			__asm__("nop");
+
+	}
+
+	/* Blink the LED (PC12) on the board. */
+	while (1) {
+	}
+
+	return 0;
+}

examples/stm32/stm32-h103/led_stripe/led_stripe.ld

@@ -0,0 +1,31 @@
+/*
+ * This file is part of the libopencm3 project.
+ *
+ * Copyright (C) 2009 Uwe Hermann <uwe@hermann-uwe.de>
+ *
+ * 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 <http://www.gnu.org/licenses/>.
+ */
+
+/* Linker script for Olimex STM32-H103 (STM32F103RBT6, 128K flash, 20K RAM). */
+
+/* Define memory regions. */
+MEMORY
+{
+	rom (rx) : ORIGIN = 0x08000000, LENGTH = 128K
+	ram (rwx) : ORIGIN = 0x20000000, LENGTH = 20K
+}
+
+/* Include the common ld script. */
+INCLUDE libopencm3_stm32.ld
+