| // Copyright 2021 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| /* |
| * Access via MCP2221A device. |
| */ |
| #ifndef HPS_HAL_MCP_H_ |
| #define HPS_HAL_MCP_H_ |
| |
| #include <memory> |
| |
| #include <libusb-1.0/libusb.h> |
| |
| #include "hps/dev.h" |
| |
| namespace hps { |
| |
| inline static constexpr int kMcpTransferSize = 64; // Transfer buffer size |
| |
| class Mcp : public DevInterface { |
| public: |
| ~Mcp() override; |
| void Close(); |
| bool ReadDevice(uint8_t cmd, uint8_t* data, size_t len) override; |
| bool WriteDevice(uint8_t cmd, const uint8_t* data, size_t len) override; |
| size_t BlockSizeBytes() override; |
| static std::unique_ptr<DevInterface> Create(uint8_t address, |
| uint32_t speedKHz); |
| |
| private: |
| explicit Mcp(uint8_t addr) |
| : address_(static_cast<uint8_t>(addr << 1)), |
| div_(0), |
| context_(nullptr), |
| handle_(nullptr) {} |
| bool Init(uint32_t speedKHz); |
| bool PrepareBus(); |
| bool Cmd(); |
| void Clear(); |
| |
| uint8_t address_; |
| uint8_t div_; |
| libusb_context* context_; |
| libusb_device_handle* handle_; |
| uint8_t in_[kMcpTransferSize]; |
| uint8_t out_[kMcpTransferSize]; |
| }; |
| |
| } // namespace hps |
| |
| #endif // HPS_HAL_MCP_H_ |