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hypercube
2026-03-26 22:35:02 +00:00
parent 560582ec9f
commit 4be958987e
3 changed files with 305 additions and 0 deletions
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9
CMakeLists.txt Normal file
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cmake_minimum_required(VERSION 3.13)
include(pico_sdk_import.cmake)
project(hello_world)
pico_sdk_init()
add_executable(blink blink.c)
target_link_libraries(blink pico_stdlib hardware_pwm hardware_i2c)
pico_add_extra_outputs(blink)

175
blink.c Normal file
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/**
* Copyright (c) 2020 Raspberry Pi (Trading) Ltd.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <math.h>
#include <pico/time.h>
#include <stdint.h>
#include <string.h>
#include <stdio.h>
#include <pico/stdio.h>
#include "pico/stdlib.h"
#include "hardware/pwm.h"
#include "hardware/i2c.h"
#define PI 3.14159265358979323433
#define STEPS_PER_SECOND 100
#define STEP_SLEEP_DURATION (1000 / STEPS_PER_SECOND)
#define EXTERNAL_LED_PIN 22
#define SSD1306_I2C_SDA_PIN 12
#define SSD1306_I2C_SCL_PIN 13
#define SSD1306_I2C_ADDRESS 0x3C
#define SSD1306_I2C_BAUDRATE 1000000
#define SSD1306_WIDTH 128
#define SSD1306_HEIGHT 64
#define SSD1306_FRAME_SIZE (SSD1306_WIDTH * SSD1306_HEIGHT / 8)
static uint8_t ssd1306_framebuffer[SSD1306_WIDTH * SSD1306_HEIGHT / 8] = {0};
void setupUART(){
uart_inst_t * UART_ID = uart0;
const uint BAUD = 115200;
const uint TX_PIN = 0;
const uint RX_PIN = 1;
uart_init(UART_ID, BAUD);
stdio_uart_init_full(UART_ID, BAUD, TX_PIN, RX_PIN);
gpio_set_function(TX_PIN, GPIO_FUNC_UART);
gpio_set_function(RX_PIN, GPIO_FUNC_UART);
uart_set_format(UART_ID, 8, 1, UART_PARITY_NONE);
}
void ssd1306_write_command(i2c_inst_t *i2c_port, uint8_t command) {
uint8_t buf[2] = {0x00, command};
int ret = i2c_write_blocking(i2c_port, SSD1306_I2C_ADDRESS, buf, 2, false);
if(ret != 2) printf("write command failed");
}
void ssd1306_init(i2c_inst_t *i2c_port) {
ssd1306_write_command(i2c_port, 0xAE); // Display OFF
ssd1306_write_command(i2c_port, 0x20); // Set Memory Addressing Mode
ssd1306_write_command(i2c_port, 0x00); // Horizontal addressing mode
ssd1306_write_command(i2c_port, 0xB0); // Page start address
ssd1306_write_command(i2c_port, 0xC8); // COM Output Scan Direction
ssd1306_write_command(i2c_port, 0x00); // Low column address
ssd1306_write_command(i2c_port, 0x10); // High column address
ssd1306_write_command(i2c_port, 0x40); // Start line address
ssd1306_write_command(i2c_port, 0x81); // Contrast control
ssd1306_write_command(i2c_port, 0xFF); // Max contrast
ssd1306_write_command(i2c_port, 0xA1); // Segment remap
ssd1306_write_command(i2c_port, 0xA6); // Normal display
ssd1306_write_command(i2c_port, 0xA8); // Multiplex ratio
ssd1306_write_command(i2c_port, 0x3F); // Duty = 1/64
ssd1306_write_command(i2c_port, 0xA4); // Display follows RAM
ssd1306_write_command(i2c_port, 0xD3); // Display offset
ssd1306_write_command(i2c_port, 0x00); // No offset
ssd1306_write_command(i2c_port, 0xD5); // Display clock
ssd1306_write_command(i2c_port, 0xF0);
ssd1306_write_command(i2c_port, 0xD9); // Pre-charge period
ssd1306_write_command(i2c_port, 0x22);
ssd1306_write_command(i2c_port, 0xDA); // COM pins
ssd1306_write_command(i2c_port, 0x12);
ssd1306_write_command(i2c_port, 0xDB); // VCOMH deselect level
ssd1306_write_command(i2c_port, 0x20);
ssd1306_write_command(i2c_port, 0x8D); // Charge pump
ssd1306_write_command(i2c_port, 0x14);
ssd1306_write_command(i2c_port, 0xAF); // Display ON
}
void ssd1306_flush(i2c_inst_t *i2c_port, uint8_t* data, uint data_len) {
// Set column address range: 0 to 127
ssd1306_write_command(i2c_port, 0x21); // Set column address command
ssd1306_write_command(i2c_port, 0x00); // Start column
ssd1306_write_command(i2c_port, 0x7F); // End column (127)
// Set page address range: 0 to 7
ssd1306_write_command(i2c_port, 0x22); // Set page address command
ssd1306_write_command(i2c_port, 0x00); // Start page
ssd1306_write_command(i2c_port, 0x07); // End page (7)
// Start I2C transaction to send full framebuffer
uint8_t tx[1 + data_len];
tx[0] = 0x40;
memcpy(tx+1, ssd1306_framebuffer, data_len);
int ret = i2c_write_blocking(i2c_port, SSD1306_I2C_ADDRESS, tx, sizeof(tx), false);
}
void ssd1306_flush_region(i2c_inst_t *i2c_port, uint8_t* data, uint data_len) {
uint8_t col_start = 0;
uint8_t col_end = 63;
uint8_t page_start = 0;
uint8_t page_end = 3;
const uint width = (uint)(col_end - col_start + 1);
const uint pages = (uint)(page_end - page_start + 1);
uint8_t tx[1 + width * pages];
tx[0] = 0x40;
for(int i = 0; i < pages; i++){
memcpy(tx + 1 + i * width, data + SSD1306_WIDTH * i + col_start, width);
}
// Set column address range: 0 to 127
ssd1306_write_command(i2c_port, 0x21); // Set column address command
ssd1306_write_command(i2c_port, col_start); // Start column
ssd1306_write_command(i2c_port, col_end); // End column (127)
// Set page address range: 0 to 7
ssd1306_write_command(i2c_port, 0x22); // Set page address command
ssd1306_write_command(i2c_port, page_start); // Start page
ssd1306_write_command(i2c_port, page_end); // End page (7)
// Start I2C transaction to send full framebuffer
int ret = i2c_write_blocking(i2c_port, SSD1306_I2C_ADDRESS, tx, sizeof(tx), false);
}
void ssd1306_setpixel(uint8_t x, uint8_t y, bool value){
int page = y / 8;
int bit_offset = y % 8;
int byte_idx = page * SSD1306_WIDTH + x;
ssd1306_framebuffer[byte_idx] &= ~(1 << bit_offset);
ssd1306_framebuffer[byte_idx] |= value << bit_offset;
}
int main() {
setupUART();
i2c_inst_t * I2C_ID = i2c0;
i2c_init(I2C_ID, SSD1306_I2C_BAUDRATE);
gpio_set_function(SSD1306_I2C_SDA_PIN, GPIO_FUNC_I2C);
gpio_set_function(SSD1306_I2C_SCL_PIN, GPIO_FUNC_I2C);
gpio_pull_up(SSD1306_I2C_SDA_PIN);
gpio_pull_up(SSD1306_I2C_SCL_PIN);
sleep_ms(100);
ssd1306_init(I2C_ID);
memset(ssd1306_framebuffer, 0x00, SSD1306_FRAME_SIZE);
ssd1306_flush(I2C_ID, ssd1306_framebuffer, SSD1306_FRAME_SIZE);
printf("ssd1306 setup\n");
sleep_ms(100);
const int SAMPLE_FRAMES = 100;
uint32_t start_ms = to_ms_since_boot(get_absolute_time());
for (int i = 0; i < SAMPLE_FRAMES; ++i) {
memset(ssd1306_framebuffer, 0x00, SSD1306_FRAME_SIZE);
ssd1306_flush(I2C_ID, ssd1306_framebuffer, SSD1306_FRAME_SIZE);
memset(ssd1306_framebuffer, 0xFF, SSD1306_FRAME_SIZE);
ssd1306_flush(I2C_ID, ssd1306_framebuffer, SSD1306_FRAME_SIZE);
}
uint32_t end_ms = to_ms_since_boot(get_absolute_time());
uint32_t elapsed_ms = end_ms - start_ms;
float frames = (float)SAMPLE_FRAMES * 2.0f; // two frames per loop iteration
float fps = frames * 1000.0f / (float)elapsed_ms;
printf("Elapsed: %u ms for %.0f frames -> FPS = %.2f\n", elapsed_ms, frames, fps);
memset(ssd1306_framebuffer, 0x0, SSD1306_FRAME_SIZE);
ssd1306_flush(I2C_ID, ssd1306_framebuffer, SSD1306_FRAME_SIZE);
while (true) tight_loop_contents();
}

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pico_sdk_import.cmake Normal file
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# This is a copy of <PICO_SDK_PATH>/external/pico_sdk_import.cmake
# This can be dropped into an external project to help locate this SDK
# It should be include()ed prior to project()
# Copyright 2020 (c) 2020 Raspberry Pi (Trading) Ltd.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted provided that the
# following conditions are met:
#
# 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following
# disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
# disclaimer in the documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
if (DEFINED ENV{PICO_SDK_PATH} AND (NOT PICO_SDK_PATH))
set(PICO_SDK_PATH $ENV{PICO_SDK_PATH})
message("Using PICO_SDK_PATH from environment ('${PICO_SDK_PATH}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT} AND (NOT PICO_SDK_FETCH_FROM_GIT))
set(PICO_SDK_FETCH_FROM_GIT $ENV{PICO_SDK_FETCH_FROM_GIT})
message("Using PICO_SDK_FETCH_FROM_GIT from environment ('${PICO_SDK_FETCH_FROM_GIT}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_PATH} AND (NOT PICO_SDK_FETCH_FROM_GIT_PATH))
set(PICO_SDK_FETCH_FROM_GIT_PATH $ENV{PICO_SDK_FETCH_FROM_GIT_PATH})
message("Using PICO_SDK_FETCH_FROM_GIT_PATH from environment ('${PICO_SDK_FETCH_FROM_GIT_PATH}')")
endif ()
if (DEFINED ENV{PICO_SDK_FETCH_FROM_GIT_TAG} AND (NOT PICO_SDK_FETCH_FROM_GIT_TAG))
set(PICO_SDK_FETCH_FROM_GIT_TAG $ENV{PICO_SDK_FETCH_FROM_GIT_TAG})
message("Using PICO_SDK_FETCH_FROM_GIT_TAG from environment ('${PICO_SDK_FETCH_FROM_GIT_TAG}')")
endif ()
if (PICO_SDK_FETCH_FROM_GIT AND NOT PICO_SDK_FETCH_FROM_GIT_TAG)
set(PICO_SDK_FETCH_FROM_GIT_TAG "master")
message("Using master as default value for PICO_SDK_FETCH_FROM_GIT_TAG")
endif()
set(PICO_SDK_PATH "${PICO_SDK_PATH}" CACHE PATH "Path to the Raspberry Pi Pico SDK")
set(PICO_SDK_FETCH_FROM_GIT "${PICO_SDK_FETCH_FROM_GIT}" CACHE BOOL "Set to ON to fetch copy of SDK from git if not otherwise locatable")
set(PICO_SDK_FETCH_FROM_GIT_PATH "${PICO_SDK_FETCH_FROM_GIT_PATH}" CACHE FILEPATH "location to download SDK")
set(PICO_SDK_FETCH_FROM_GIT_TAG "${PICO_SDK_FETCH_FROM_GIT_TAG}" CACHE FILEPATH "release tag for SDK")
if (NOT PICO_SDK_PATH)
if (PICO_SDK_FETCH_FROM_GIT)
include(FetchContent)
set(FETCHCONTENT_BASE_DIR_SAVE ${FETCHCONTENT_BASE_DIR})
if (PICO_SDK_FETCH_FROM_GIT_PATH)
get_filename_component(FETCHCONTENT_BASE_DIR "${PICO_SDK_FETCH_FROM_GIT_PATH}" REALPATH BASE_DIR "${CMAKE_SOURCE_DIR}")
endif ()
FetchContent_Declare(
pico_sdk
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
)
if (NOT pico_sdk)
message("Downloading Raspberry Pi Pico SDK")
# GIT_SUBMODULES_RECURSE was added in 3.17
if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
FetchContent_Populate(
pico_sdk
QUIET
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
GIT_SUBMODULES_RECURSE FALSE
SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
)
else ()
FetchContent_Populate(
pico_sdk
QUIET
GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
GIT_TAG ${PICO_SDK_FETCH_FROM_GIT_TAG}
SOURCE_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-src
BINARY_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-build
SUBBUILD_DIR ${FETCHCONTENT_BASE_DIR}/pico_sdk-subbuild
)
endif ()
set(PICO_SDK_PATH ${pico_sdk_SOURCE_DIR})
endif ()
set(FETCHCONTENT_BASE_DIR ${FETCHCONTENT_BASE_DIR_SAVE})
else ()
message(FATAL_ERROR
"SDK location was not specified. Please set PICO_SDK_PATH or set PICO_SDK_FETCH_FROM_GIT to on to fetch from git."
)
endif ()
endif ()
get_filename_component(PICO_SDK_PATH "${PICO_SDK_PATH}" REALPATH BASE_DIR "${CMAKE_BINARY_DIR}")
if (NOT EXISTS ${PICO_SDK_PATH})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' not found")
endif ()
set(PICO_SDK_INIT_CMAKE_FILE ${PICO_SDK_PATH}/pico_sdk_init.cmake)
if (NOT EXISTS ${PICO_SDK_INIT_CMAKE_FILE})
message(FATAL_ERROR "Directory '${PICO_SDK_PATH}' does not appear to contain the Raspberry Pi Pico SDK")
endif ()
set(PICO_SDK_PATH ${PICO_SDK_PATH} CACHE PATH "Path to the Raspberry Pi Pico SDK" FORCE)
include(${PICO_SDK_INIT_CMAKE_FILE})