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Diffstat (limited to 'examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c')
-rw-r--r--examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c68
1 files changed, 35 insertions, 33 deletions
diff --git a/examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c b/examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c
index 1576866..ea1ad48 100644
--- a/examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c
+++ b/examples/stm32/f1/stm32-h103/led_stripe/led_stripe.c
@@ -18,14 +18,13 @@
*/
/*
- * This example is implementing the protocol of ZJ168 addressable led
+ * 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 <stdlib.h>
-
#include <libopencm3/stm32/f1/rcc.h>
#include <libopencm3/stm32/f1/gpio.h>
@@ -68,10 +67,9 @@ void clock_setup(void)
{
rcc_clock_setup_in_hse_8mhz_out_72mhz();
- /* Enable GPIOC clock. */
+ /* Enable GPIOB and GPIOC clock. */
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPCEN);
rcc_peripheral_enable_clock(&RCC_APB2ENR, RCC_APB2ENR_IOPBEN);
-
}
void gpio_setup(void)
@@ -79,28 +77,33 @@ 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);
+
+ /* Set GPIO13 (in GPIO port B) to 'output push-pull'. */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
+
+ /* Set GPIO15 (in GPIO port B) to 'output push-pull'. */
gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
}
-void send_colors(struct color *colors, int count) {
+void send_colors(struct color *colors, int count)
+{
int i, k;
- /* initialize spi pins */
+ /* Initialize SPI pins. */
SCLK(0);
MOSI(0);
- /* start frame */
- for (i=0; i<32; i++) {
+ /* Start frame */
+ for (i = 0; i < 32; i++) {
SCLK(1);
SMALL_DELAY();
SCLK(0);
SMALL_DELAY();
}
- /* color cell output */
+ /* Color cell output */
for (k = 0; k < count; k++) {
/* Start bit */
MOSI(1);
@@ -110,7 +113,7 @@ void send_colors(struct color *colors, int count) {
SMALL_DELAY();
/* Blue */
- for (i=0; i<5; i++) {
+ for (i = 0; i < 5; i++) {
MOSI(((colors[k].b & ((1 << 4) >> i)) != 0));
SCLK(1);
SMALL_DELAY();
@@ -118,7 +121,7 @@ void send_colors(struct color *colors, int count) {
SMALL_DELAY();
}
/* Red */
- for (i=0; i<5; i++) {
+ for (i = 0; i < 5; i++) {
MOSI(((colors[k].r & ((1 << 4) >> i)) != 0));
SCLK(1);
SMALL_DELAY();
@@ -126,7 +129,7 @@ void send_colors(struct color *colors, int count) {
SMALL_DELAY();
}
/* Green */
- for (i=0; i<5; i++) {
+ for (i = 0; i < 5; i++) {
MOSI(((colors[k].g & ((1 << 4) >> i)) != 0));
SCLK(1);
SMALL_DELAY();
@@ -137,7 +140,7 @@ void send_colors(struct color *colors, int count) {
/* End frame */
MOSI(0);
- for (k=0; k < count; k++) {
+ for (k = 0; k < count; k++) {
SCLK(1);
SMALL_DELAY();
SCLK(0);
@@ -145,18 +148,19 @@ void send_colors(struct color *colors, int count) {
}
}
-void reset_colors(struct color *colors, int count) {
+void reset_colors(struct color *colors, int count)
+{
int i;
- for (i=0; i<count; 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) {
-
+void init_colors(struct color *colors, int count)
+{
colors[0].r = 0x1F;
colors[0].g = 0;
colors[0].b = 0;
@@ -170,28 +174,29 @@ void init_colors(struct color *colors, int count) {
count = count;
}
-void step_colors(struct color *colors, int count) {
+void step_colors(struct color *colors, int count)
+{
int i;
struct color tmp_color1;
struct color tmp_color2;
-/* random blinking */
-/*
- for (i=0; i<count; i++) {
- colors[i].r = rand()&0x01;
- colors[i].g = rand()&0x01;
- colors[i].b = rand()&0x01;
+#if 0
+ /* Random blinking. */
+ for (i = 0; i < count; i++) {
+ colors[i].r = rand() & 0x01;
+ colors[i].g = rand() & 0x01;
+ colors[i].b = rand() & 0x01;
}
-*/
- /* generate next colors */
+#endif
+ /* 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++) {
+ 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;
@@ -202,7 +207,6 @@ void step_colors(struct color *colors, int count) {
tmp_color1.g = tmp_color2.g;
tmp_color1.b = tmp_color2.b;
}
-
}
int main(void)
@@ -224,10 +228,8 @@ int main(void)
step_colors(colors, COLOR_COUNT);
- /* Wait a little */
for (i = 0; i < 1000000; i++) /* Wait a bit. */
__asm__("nop");
-
}
return 0;