mirror of
https://github.com/google/mozc-devices.git
synced 2025-11-08 16:53:28 +03:00
6783bfea76
Co-authored-by: Takashi Toyoshima <toyoshim@google.com> Co-authored-by: Shun Ikejima <ikejima@google.com>
47 lines
1.4 KiB
C++
47 lines
1.4 KiB
C++
// Copyright 2025 Google Inc.
|
|
// Use of this source code is governed by an Apache License that can be found
|
|
// in the LICENSE file.
|
|
|
|
#include "i2c_controller.h"
|
|
|
|
#include <algorithm>
|
|
#include <vector>
|
|
|
|
#include "hardware/gpio.h"
|
|
|
|
static constexpr int kI2CSpeedInHz = 400 * 1000;
|
|
|
|
I2CController::I2CController(i2c_inst_t* i2c, int8_t sda, int8_t scl)
|
|
: i2c_(i2c) {
|
|
hard_assert(i2c == i2c0 || i2c == i2c1);
|
|
gpio_init(sda);
|
|
gpio_init(scl);
|
|
gpio_set_function(sda, GPIO_FUNC_I2C);
|
|
gpio_set_function(scl, GPIO_FUNC_I2C);
|
|
gpio_pull_up(sda);
|
|
gpio_pull_up(scl);
|
|
i2c_init(i2c_, kI2CSpeedInHz);
|
|
}
|
|
|
|
bool I2CController::Read(uint8_t device_addr,
|
|
uint8_t mem_addr,
|
|
std::span<uint8_t> data) {
|
|
uint8_t addr[1] = {mem_addr};
|
|
int result = i2c_write_blocking(i2c_, device_addr, addr, 1, true);
|
|
if (result != 1) {
|
|
return false;
|
|
}
|
|
result = i2c_read_blocking(i2c_, device_addr, data.data(), data.size(), false);
|
|
return result == data.size();
|
|
}
|
|
|
|
bool I2CController::Write(uint8_t device_addr,
|
|
uint8_t mem_addr,
|
|
std::span<uint8_t> data) {
|
|
std::vector<uint8_t> buf;
|
|
buf.reserve(data.size() + 1);
|
|
buf.push_back(mem_addr);
|
|
buf.insert(buf.end(), data.begin(), data.end());
|
|
int rc = i2c_write_blocking(i2c_, device_addr, buf.data(), buf.size(), false);
|
|
return rc == buf.size();
|
|
} |