Initial commit

.clangd

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+CompileFlags:
+  #Add: [--query-driver=/usr/bin/arm-none-eabi-g++]
+  Compiler: /usr/bin/arm-none-eabi-g++
+
+

.gitignore

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+build
+.cache

.gitmodules

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+[submodule "pico-sdk"]
+	path = pico-sdk
+	url = https://github.com/raspberrypi/pico-sdk

CMakeLists.txt

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+cmake_minimum_required(VERSION 3.13)
+
+set(PICO_SDK_PATH "${CMAKE_CURRENT_SOURCE_DIR}/pico-sdk")
+include(pico_sdk_import.cmake)
+
+project(SH1106 C CXX ASM)
+pico_sdk_init()
+
+add_subdirectory(src)

compile_commands.json

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+build/compile_commands.json

pico-sdk

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+Subproject commit 6a7db34ff63345a7badec79ebea3aaef1712f374

pico_sdk_import.cmake

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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()
+
+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 ()
+
+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")
+
+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 "${CMAKE_SOURCE_DIR}")
+        endif ()
+        # GIT_SUBMODULES_RECURSE was added in 3.17
+        if (${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.17.0")
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+                    GIT_SUBMODULES_RECURSE FALSE
+            )
+        else ()
+            FetchContent_Declare(
+                    pico_sdk
+                    GIT_REPOSITORY https://github.com/raspberrypi/pico-sdk
+                    GIT_TAG master
+            )
+        endif ()
+
+        if (NOT pico_sdk)
+            message("Downloading Raspberry Pi Pico SDK")
+            FetchContent_Populate(pico_sdk)
+            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})

src/CMakeLists.txt

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+add_executable(main
+  main.cc
+  )
+
+target_link_libraries(main pico_stdlib hardware_i2c hardware_uart)
+
+pico_enable_stdio_uart(main 0)
+
+pico_add_extra_outputs(main)

src/main.cc

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+#include "main.hh"
+
+#include "hardware/gpio.h"
+#include "hardware/i2c.h"
+#include "pico/error.h"
+
+static bool failure = false;
+
+int main(void) {
+  sh1106_disp disp;
+
+  gpio_init(25);
+  gpio_set_dir(25, GPIO_OUT);
+
+  busy_wait_ms(100);
+
+  disp.poweron();
+  disp.test();
+
+  while (true) {
+    gpio_put(25, false);
+    busy_wait_ms(failure ? 500 : 50);
+    gpio_put(25, true);
+    busy_wait_ms(failure ? 500 : 50);
+  }
+
+  return 0;
+}
+
+sh1106_i2c::sh1106_i2c(uint8_t addr) : m_addr(addr) {
+  m_i2c = i2c0;
+
+  i2c_init(i2c0, 200000);
+
+  gpio_init(0);
+  gpio_init(1);
+
+  gpio_set_function(0, GPIO_FUNC_I2C);
+  gpio_set_function(1, GPIO_FUNC_I2C);
+}
+
+void sh1106_i2c::write_cmd(uint8_t cmd) {
+  failure |= i2c_write_blocking(i2c0, m_addr, &cmd, 1, false) < 0;
+}
+
+void sh1106_i2c::write_data(const uint8_t *data, size_t len) {
+  for (size_t i = 0; i < len; i++) {
+    failure |= i2c_write_blocking(i2c0, m_addr, &data[i], 1, false) < 0;
+  }
+}
+
+sh1106_disp::sh1106_disp() : m_i2c_conn(0x3c) {}
+
+void sh1106_disp::poweron() { m_i2c_conn.write_cmd(SH1106_SET_DISP | 0x00); }
+
+void sh1106_disp::poweroff() { m_i2c_conn.write_cmd(SH1106_SET_DISP | 0x01); }
+
+void sh1106_disp::test() {
+  uint8_t buf[3] = {0xFF};
+  m_i2c_conn.write_cmd(SH1106_SET_PAGE_ADDRESS | 0x0);
+  m_i2c_conn.write_cmd(SH1106_SET_HIGH_COLUMN_ADDRESS | 0x2);
+  m_i2c_conn.write_cmd(SH1106_SET_LOW_COLUMN_ADDRESS | 0x0);
+  m_i2c_conn.write_cmd(SH1106_SET_CONTRAST);
+  m_i2c_conn.write_cmd(0xFF);
+  m_i2c_conn.write_cmd(SH1106_SET_NORM_INV | 0x1);
+}

src/main.hh

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+#pragma once
+#include <hardware/i2c.h>
+
+#include <stdint.h>
+
+const uint8_t SH1106_SET_CONTRAST = 0x81u;
+const uint8_t SH1106_SET_NORM_INV = 0xa6u;
+const uint8_t SH1106_SET_DISP = 0xaeu;
+const uint8_t SH1106_SET_SCAN_DIR = 0xc0u;
+const uint8_t SH1106_SET_SEG_REMAP = 0xa0u;
+const uint8_t SH1106_SET_LOW_COLUMN_ADDRESS = 0x00u;
+const uint8_t SH1106_SET_HIGH_COLUMN_ADDRESS = 0x10u;
+const uint8_t SH1106_SET_PAGE_ADDRESS = 0xb0u;
+
+class sh1106_i2c {
+private:
+  i2c_inst_t *m_i2c;
+  uint8_t m_addr;
+
+public:
+  sh1106_i2c(uint8_t addr);
+
+  void write_cmd(uint8_t cmd);
+  void write_data(const uint8_t *data, size_t len);
+};
+
+class sh1106_disp {
+private:
+  sh1106_i2c m_i2c_conn;
+
+public:
+  sh1106_disp();
+
+  void poweron();
+  void poweroff();
+  void test();
+};