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#include <math.h>
#include <stdint.h>
#include <stdio.h>
#include "byte_math.h"
#include "ch573/gpio.h"
#include "ch573/pfic.h"
#include "ch573/pwr.h"
#include "ch573/uart.h"
#include "clock.h"
#include "panic.h"
#include "spi.h"
#include "string.h"
#include "sysled.h"
#include "system.h"
#include "systick.h"
#include "ws2812b.h"
#define PFIC_I CH573_PFIC__PFIC_T_INTF
#define PFIC ch573_pfic__pfic
#define GPIO_PORT_A ch573_gpio__gpio_port_a
#define GPIO_PORT_B ch573_gpio__gpio_port_b
#define GPIO_PORT CH573_GPIO__GPIO_PORT_T_INTF
#define UART1 ch573_uart__uart1
#define UART CH573_UART__UART_T_INTF
#define PWR1 ch573_pwr__pwr_mgmt
#define PWR CH573_PWR__PWR_MGMT_T_INTF
#define AS_BYTE(n) ((n) * 256)
#define min(a, b) (a) < (b) ? (a) : (b)
uint8_t amp(uint8_t in, uint8_t n)
{
uint32_t out = in;
for (int i = 0; i < n; ++i) {
out = (out * in) / 256;
}
return min(out, 255);
}
uint32_t collatz(uint32_t n)
{
uint32_t c = 0;
while (n > 1) {
if (n % 2 == 0) {
n /= 2;
} else {
n = n * 3 + 1;
}
c++;
}
return c;
}
static void set_system_clock_60Mhz(void)
{
clock_cfg_t clk_cfg = {0};
clk_cfg.sel = CLOCK_SELECTION_PLL;
clk_cfg.pll_clock_divisor = 8;
if (set_system_clock(&clk_cfg)) {
printf("Failed to set system clock.\n");
panic(0xff);
}
}
#define N_LEDS 150
#define N_DMA_XFER 2
extern int uart1_FILE_get(FILE* f);
static inline uint8_t byte_scale(uint8_t v, uint8_t scale)
{
uint16_t acc = v;
return (acc * scale) >> 8;
}
uint8_t clip(int x)
{
if (x > 240) {
return 240;
}
if (x < 0) {
return 0;
}
return (uint8_t)x;
}
#define TIME_STEP 1
rgb_t get_rgb(uint32_t time, size_t x)
{
int r = 0, g = 0, b = 0;
uint8_t time8 = time & 0xff;
int w = calc_w(time8 * TIME_STEP + x * 4);
r = 0xff;
g = byte_scale(byte_sin(time8 * TIME_STEP + x * 2), 0x90);
b = byte_scale(byte_sin(time8 * TIME_STEP + x * 2), 0x20);
rgb_t color;
color.color = 0;
color.r = clip(r + w);
color.g = clip(byte_scale(g, AS_BYTE(0.75)) + w);
color.b = clip(byte_scale(b, AS_BYTE(0.75)) + w);
return color;
}
static volatile uint32_t time = 0;
static volatile int spin_lock = 0;
On_SysTick() {
time ++;
spin_lock = 0;
}
/*
* Main routine. This is called on_reset once everything else has been set up.
*/
int main(void)
{
char buf[N_LEDS * TOTAL_BYTES_PER_LED];
PFIC_I.vector_table_control.set(PFIC, 1);
PFIC->interrupt_priority_threshold = 0x10;
PFIC->interrupt_enable |= IRQ_SysTick;
set_system_clock_60Mhz();
set_systick(250000);
enable_sysled();
enable_spi();
size_t n = sizeof(buf);
struct ws2812b_buf ws_buf;
make_wsb2812b(&ws_buf, buf, n);
ws_buf.byte_order = BYTE_ORDER_GRB;
rgb_t color;
GPIO_PORT.dir.set(GPIO_PORT_B, DIR_OUT, 7);
while (1) {
ws_buf.cur = 0;
for (int i = 0; i < N_LEDS; ++i) {
rgb_t rgb = get_rgb(time, i);
write_rgb(&ws_buf, rgb);
}
while (spin_lock) {
set_sysled(1); // Setting the sysled helps me to measure down time.
}
set_sysled(0);
spin_lock = 1;
for (int j = 0; j < N_DMA_XFER; ++ j) {
wait_for_dma();
start_dma(&ws_buf);
}
}
return 0;
}
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