1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/*
* 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;
}
// FIXME: Ideally we should be using the three 'charge status' bits to work
// out whether we're actually charging, or if we've got a full charge,
// critically low charge, etc.
uint8_t usb_state = raw_res & 0b11;
if (usb_state == 0) {
charge_status_ = ChargeStatus::kDischarging;
} else if (usb_state == 1) {
charge_status_ = ChargeStatus::kChargingRegular;
} else {
charge_status_ = ChargeStatus::kChargingFast;
}
}
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::kAttachedBusy : 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
|
