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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "samd.hpp"
#include <cstdint>
#include <optional>
#include <string>
#include "esp_err.h"
#include "esp_log.h"
#include "hal/gpio_types.h"
#include "hal/i2c_types.h"
#include "i2c.hpp"
enum Registers : uint8_t {
kSamdFirmwareVersion = 0,
kChargeStatus = 1,
kUsbStatus = 2,
kPowerControl = 3,
kUsbControl = 4,
};
static const uint8_t kAddress = 0x45;
[[maybe_unused]] static const char kTag[] = "SAMD";
namespace drivers {
static constexpr gpio_num_t kIntPin = GPIO_NUM_35;
Samd::Samd() {
gpio_set_direction(kIntPin, GPIO_MODE_INPUT);
// Being able to interface with the SAMD properly is critical. To ensure we
// will be able to, we begin by checking the I2C protocol version is
// compatible, and throw if it's not.
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kSamdFirmwareVersion)
.start()
.write_addr(kAddress, I2C_MASTER_READ)
.read(&version_, I2C_MASTER_NACK)
.stop();
ESP_ERROR_CHECK(transaction.Execute(1));
ESP_LOGI(kTag, "samd firmware rev: %u", version_);
UpdateChargeStatus();
UpdateUsbStatus();
}
Samd::~Samd() {}
auto Samd::Version() -> std::string {
return std::to_string(version_);
}
auto Samd::GetChargeStatus() -> std::optional<ChargeStatus> {
return charge_status_;
}
auto Samd::UpdateChargeStatus() -> void {
uint8_t raw_res;
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kChargeStatus)
.start()
.write_addr(kAddress, I2C_MASTER_READ)
.read(&raw_res, I2C_MASTER_NACK)
.stop();
esp_err_t res = transaction.Execute(1);
if (res != ESP_OK) {
return;
}
uint8_t usb_state = raw_res & 0b11;
uint8_t charge_state = (raw_res >> 2) & 0b111;
switch (charge_state) {
case 0b000:
case 0b011:
charge_status_ = ChargeStatus::kNoBattery;
break;
case 0b001:
charge_status_ = usb_state == 1 ? ChargeStatus::kChargingRegular
: ChargeStatus::kChargingFast;
break;
case 0b010:
charge_status_ = ChargeStatus::kFullCharge;
break;
case 0b100:
charge_status_ = ChargeStatus::kBatteryCritical;
break;
case 0b101:
charge_status_ = ChargeStatus::kDischarging;
break;
default:
charge_status_ = {};
break;
}
}
auto Samd::GetUsbStatus() -> UsbStatus {
return usb_status_;
}
auto Samd::UpdateUsbStatus() -> void {
uint8_t raw_res;
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kUsbStatus)
.start()
.write_addr(kAddress, I2C_MASTER_READ)
.read(&raw_res, I2C_MASTER_NACK)
.stop();
esp_err_t res = transaction.Execute(1);
if (res != ESP_OK) {
return;
}
if (!(raw_res & 0b1)) {
usb_status_ = UsbStatus::kDetached;
}
usb_status_ =
(raw_res & 0b10) ? UsbStatus::kAttachedMounted : UsbStatus::kAttachedIdle;
}
auto Samd::ResetToFlashSamd() -> void {
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kUsbControl, 0b100)
.stop();
ESP_ERROR_CHECK(transaction.Execute(3));
}
auto Samd::PowerDown() -> void {
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kPowerControl, 0b1)
.stop();
ESP_ERROR_CHECK(transaction.Execute(3));
}
auto Samd::UsbMassStorage(bool en) -> void {
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kUsbControl, en)
.stop();
ESP_ERROR_CHECK(transaction.Execute(3));
}
auto Samd::UsbMassStorage() -> bool {
uint8_t raw_res;
I2CTransaction transaction;
transaction.start()
.write_addr(kAddress, I2C_MASTER_WRITE)
.write_ack(Registers::kUsbControl)
.start()
.write_addr(kAddress, I2C_MASTER_READ)
.read(&raw_res, I2C_MASTER_NACK)
.stop();
esp_err_t res = transaction.Execute(1);
if (res != ESP_OK) {
return false;
}
return raw_res & 1;
}
} // namespace drivers
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