From: Martin Mares <mj@ucw.cz>
Date: Sun, 24 Mar 2024 12:13:23 +0000 (+0100)
Subject: test-neopixel-square: init
X-Git-Url: http://mj.ucw.cz/gitweb/?a=commitdiff_plain;h=23b70744999e99b0b58bd8bad7402988561c0a48;p=home-hw.git

test-neopixel-square: init
---

diff --git a/test-neopixel-square/Makefile b/test-neopixel-square/Makefile
new file mode 100644
index 0000000..fdc81f8
--- /dev/null
+++ b/test-neopixel-square/Makefile
@@ -0,0 +1,6 @@
+ROOT=..
+BINARY=test
+OBJS=main.o
+LIB_OBJS=util-debug.o
+
+include $(ROOT)/mk/bluepill.mk
diff --git a/test-neopixel-square/README b/test-neopixel-square/README
new file mode 100644
index 0000000..2d42d67
--- /dev/null
+++ b/test-neopixel-square/README
@@ -0,0 +1,30 @@
+Assignment of peripherals and pins
+==================================
+
+USART1	debugging
+TIM4	Neopixel control
+
+
+			   Blue Pill pinout
+			+--------------------+
+			| VBATT		3.3V |
+BluePill LED		| PC13		 GND |	Neopixel ground
+			| PC14		  5V |	Neopixel power
+			| PC15		 PB9 |
+			| PA0		 PB8 |	TIM4_CH3 - Neopixel data (pull up to +5V)
+			| PA1		 PB7 |
+			| PA2		 PB6 |
+			| PA3		 PB5 |
+			| PA4		 PB4 |
+			| PA5		 PB3 |
+			| PA6		PA15 |
+			| PA7		PA12 |
+			| PB0		PA11 |
+			| PB1		PA10 |  RXD1 - debugging console
+			| PB10		 PA9 |  TXD1 - debugging console
+			| PB11		 PA8 |
+			| RESET		PB15 |
+			| 3.3 V		PB14 |
+			| GND		PB13 |
+			| GND		PB12 |
+			+--------------------+
diff --git a/test-neopixel-square/config.h b/test-neopixel-square/config.h
new file mode 100644
index 0000000..312c7be
--- /dev/null
+++ b/test-neopixel-square/config.h
@@ -0,0 +1,14 @@
+/*
+ *	Test Gadget -- Configuration
+ *
+ *	(c) 2020 Martin Mareš <mj@ucw.cz>
+ */
+
+// Processor clock
+
+#define CPU_CLOCK_MHZ 72
+
+// Debugging port
+
+#define DEBUG_USART USART1
+#define DEBUG_LED_BLUEPILL
diff --git a/test-neopixel-square/main.c b/test-neopixel-square/main.c
new file mode 100644
index 0000000..fdfe0ab
--- /dev/null
+++ b/test-neopixel-square/main.c
@@ -0,0 +1,447 @@
+/*
+ *	Neopixel (WS2812B) Test
+ *
+ *	(c) 2022 Martin Mareš <mj@ucw.cz>
+ */
+
+#include "util.h"
+
+#include <libopencm3/cm3/cortex.h>
+#include <libopencm3/cm3/nvic.h>
+#include <libopencm3/cm3/systick.h>
+#include <libopencm3/cm3/scb.h>
+#include <libopencm3/stm32/dma.h>
+#include <libopencm3/stm32/gpio.h>
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/timer.h>
+#include <libopencm3/stm32/usart.h>
+
+#include <string.h>
+
+/*** Hardware init ***/
+
+static void clock_init(void)
+{
+	rcc_clock_setup_pll(&rcc_hse_configs[RCC_CLOCK_HSE8_72MHZ]);
+
+	rcc_periph_clock_enable(RCC_GPIOA);
+	rcc_periph_clock_enable(RCC_GPIOB);
+	rcc_periph_clock_enable(RCC_GPIOC);
+	rcc_periph_clock_enable(RCC_USART1);
+	rcc_periph_clock_enable(RCC_TIM4);
+	rcc_periph_clock_enable(RCC_DMA1);
+
+	rcc_periph_reset_pulse(RST_GPIOA);
+	rcc_periph_reset_pulse(RST_GPIOB);
+	rcc_periph_reset_pulse(RST_GPIOC);
+	rcc_periph_reset_pulse(RST_USART1);
+	rcc_periph_reset_pulse(RST_TIM4);
+}
+
+static void gpio_init(void)
+{
+	// PA9 = TXD1 for debugging console
+	// PA10 = RXD1 for debugging console
+	gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
+	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO10);
+
+	// PC13 = BluePill LED
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
+	gpio_clear(GPIOC, GPIO13);
+
+	// PB8 = data for Neopixel
+	gpio_set_mode(GPIOB, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_OPENDRAIN, GPIO8);
+}
+
+static void usart_init(void)
+{
+	usart_set_baudrate(USART1, 115200);
+	usart_set_databits(USART1, 8);
+	usart_set_stopbits(USART1, USART_STOPBITS_1);
+	usart_set_mode(USART1, USART_MODE_TX);
+	usart_set_parity(USART1, USART_PARITY_NONE);
+	usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
+
+	usart_enable(USART1);
+}
+
+/*** System ticks ***/
+
+static volatile u32 ms_ticks;
+
+void sys_tick_handler(void)
+{
+	ms_ticks++;
+}
+
+static void tick_init(void)
+{
+	systick_set_frequency(1000, CPU_CLOCK_MHZ * 1000000);
+	systick_counter_enable();
+	systick_interrupt_enable();
+}
+
+static void delay_ms(uint ms)
+{
+	u32 start_ticks = ms_ticks;
+	while (ms_ticks - start_ticks < ms)
+		;
+}
+
+/*** Neopixels ***/
+
+#define NPIX_PERIOD 90		// timer runs on 72 MHz, so 90 periods = 1250 ns
+#define B0 30
+#define B1 60
+
+byte neopixel_buf[] = {
+	// 128 cycles low: reset (has to be longer than in the datasheet)
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, 0, 0, 0, 0, 0,
+
+	// G7 G6 G5 G4 G3 G2 G1 G0
+	// R7 R6 R5 R4 R3 R2 R1 R0
+	// B7 B6 B5 B4 B3 B2 B1 B0
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+	B0, B0, B0, B0, B0, B0, B0, B0,
+
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+	B0, B0, B0, B0, B1, B1, B1, B1,
+};
+
+static void neopixel_init(void)
+{
+	// TIM4 update is connected to DMA1 channel 7
+
+	// FIXME: Strange programming sequence as specified in manual
+
+	dma_channel_reset(DMA1, 7);
+
+	dma_set_peripheral_address(DMA1, 7, (u32) &TIM_CCR3(TIM4));
+	dma_set_memory_address(DMA1, 7, (u32) neopixel_buf);
+	dma_set_number_of_data(DMA1, 7, ARRAY_SIZE(neopixel_buf));
+	dma_set_priority(DMA1, 7, DMA_CCR_PL_VERY_HIGH);
+
+	dma_set_read_from_memory(DMA1, 7);
+	dma_enable_circular_mode(DMA1, 7);
+
+	dma_set_memory_size(DMA1, 7, DMA_CCR_MSIZE_8BIT);
+	dma_enable_memory_increment_mode(DMA1, 7);
+
+	dma_set_peripheral_size(DMA1, 7, DMA_CCR_PSIZE_16BIT);
+	dma_disable_peripheral_increment_mode(DMA1, 7);
+
+	dma_enable_channel(DMA1, 7);
+
+	timer_set_prescaler(TIM4, 0);
+	timer_set_mode(TIM4, TIM_CR1_CKD_CK_INT, TIM_CR1_CMS_EDGE, TIM_CR1_DIR_UP);
+	timer_disable_preload(TIM4);
+	timer_set_period(TIM4, NPIX_PERIOD - 1);
+
+	timer_set_oc_mode(TIM4, TIM_OC3, TIM_OCM_PWM1);
+	timer_set_oc_value(TIM4, TIM_OC3, 0);
+	timer_set_oc_polarity_high(TIM4, TIM_OC3);
+	timer_enable_oc_output(TIM4, TIM_OC3);
+
+	timer_set_dma_on_update_event(TIM4);
+	TIM_DIER(TIM4) |= TIM_DIER_UDE;
+
+	timer_enable_counter(TIM4);
+}
+
+/*** Main ***/
+
+int main(void)
+{
+	clock_init();
+	gpio_init();
+	usart_init();
+	tick_init();
+	neopixel_init();
+
+	debug_printf("Hello, world!\n");
+
+#if 0
+	for (int i=0; i<24*64; i++)
+		neopixel_buf[128+i] = B1;
+#endif
+
+	for (;;) {
+		// wait_for_interrupt();
+		debug_led(1);
+		for (int i=4; i<8; i++)
+			neopixel_buf[128+24*63+i] = B1;
+		delay_ms(100);
+		debug_led(0);
+		for (int i=4; i<8; i++)
+			neopixel_buf[128+24*63+i] = B0;
+		delay_ms(500);
+	}
+
+	return 0;
+}
diff --git a/test-neopixel/README b/test-neopixel/README
index bad9e94..2d42d67 100644
--- a/test-neopixel/README
+++ b/test-neopixel/README
@@ -11,7 +11,7 @@ TIM4	Neopixel control
 BluePill LED		| PC13		 GND |	Neopixel ground
 			| PC14		  5V |	Neopixel power
 			| PC15		 PB9 |
-			| PA0		 PB8 |	TIM4_CH3 - Neopixel data
+			| PA0		 PB8 |	TIM4_CH3 - Neopixel data (pull up to +5V)
 			| PA1		 PB7 |
 			| PA2		 PB6 |
 			| PA3		 PB5 |