| // Copyright 2019 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <ddk/platform-defs.h> |
| #include <fcntl.h> |
| #include <fuchsia/hardware/ftdi/llcpp/fidl.h> |
| #include <lib/fdio/fdio.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <zircon/syscalls.h> |
| |
| #include <filesystem> |
| #include <iostream> |
| |
| void PrintHelp() { |
| printf( |
| "Usage: create_ssd1306 \n \ |
| create_ssd1306: This program creates an I2C bus on the FTDI 232H breakout chip \n \ |
| and programs it to have the ssd1306 display brought up as an I2C device. If this \n \ |
| completes successfully, `dm dump` should have the 'ftdi-i2c' device and the \n \ |
| 'ssd1306' device. The ssd1306 device should appear under /dev/class/dotmatrix-display \n \ |
| \n \ |
| PLEASE NOTE: The I2C bus on the 232H must be used as follows: \n \ |
| Pin 0 - SCL \n \ |
| Pins 1 & 2 - SDA and must be wired together\n"); |
| } |
| |
| int main(int argc, char** argv) { |
| if (argc > 1) { |
| PrintHelp(); |
| return 0; |
| } |
| |
| const char* path = "/dev/class/serial-impl/"; |
| int fd = -1; |
| for (const auto& entry : std::filesystem::directory_iterator(path)) { |
| fd = open(entry.path().c_str(), O_RDWR); |
| if (fd > 0) { |
| break; |
| } |
| } |
| if (fd <= 0) { |
| printf("Open serial-impl failed with %d\n", fd); |
| return 1; |
| } |
| |
| zx_handle_t handle; |
| zx_status_t status = fdio_get_service_handle(fd, &handle); |
| if (status != ZX_OK) { |
| printf("Create FIDL handle failed with %d\n", status); |
| return 1; |
| } |
| |
| // This wires the 0 pin as SCL and pins 1 & 2 as SDA. |
| ::llcpp::fuchsia::hardware::ftdi::I2cBusLayout layout = {0, 1, 2}; |
| ::llcpp::fuchsia::hardware::ftdi::I2cDevice i2c_dev = { |
| // This is the I2C address for the SSD1306. |
| 0x3c, |
| // These are the SSD1306 driver binding rules. |
| PDEV_VID_GENERIC, |
| PDEV_PID_GENERIC, |
| PDEV_DID_SSD1306}; |
| |
| auto resp = ::llcpp::fuchsia::hardware::ftdi::Device::Call::CreateI2C(zx::unowned_channel(handle), layout, i2c_dev); |
| status = resp.status(); |
| if (status != ZX_OK) { |
| printf("Create I2C device failed with %d\n", status); |
| return 1; |
| } |
| |
| return 0; |
| } |