除了 ESP32 PCNT（Pulse Counter / 脈衝計數器）API 函數模塊外，還提供了結構件（Structures）、巨集（Marco）、 泛型型別定義（Type Definitions）和枚舉（Enumerations）。
1. Structure：
1.1. struct pcnt_config_t：
Pulse Counter configuration for a single channel.
Public Members
|
Description
|
int
pulse_gpio_num
|
Pulse input GPIO number, if you want to use GPIO16, enter
pulse_gpio_num = 16, a negative value will be ignored
|
int
ctrl_gpio_num
|
Control signal input GPIO number, a negative value will be ignored
|
pcnt_ctrl_mode_t
lctrl_mode
|
PCNT low control mode
|
pcnt_ctrl_mode_t
hctrl_mode
|
PCNT high control mode
|
pcnt_count_mode_t
pos_mode
|
PCNT positive edge count mode
|
pcnt_count_mode_t
neg_mode
|
PCNT negative edge count mode
|
int16_t
counter_h_lim
|
Maximum counter value
|
int16_t
counter_l_lim
|
Minimum counter value
|
pcnt_unit_t unit
|
PCNT unit number
|
pcnt_channel_t
channel
|
the PCNT channel
|
範例：
pcnt_config_t
pcnt_config = {
.pulse_gpio_num = 4, //set gpio4 as pulse input gpio
.ctrl_gpio_num = 5, //set
gpio5 as control gpio
.channel = PCNT_CHANNEL_0, //use unit 0 channel 0
.lctrl_mode = PCNT_MODE_REVERSE, //when control signal is low, reverse
the primary counter mode(inc->dec/dec->inc)
.hctrl_mode = PCNT_MODE_KEEP, //when control signal is high, keep the
primary counter mode
.pos_mode = PCNT_COUNT_INC, //increment the counter
.neg_mode = PCNT_COUNT_DIS, //keep the counter value
.counter_h_lim = 10,
.counter_l_lim = -10,
};
2. Macros：
Macros
|
Description
|
PCNT_PIN_NOT_USED
|
When selected for a pin, this pin will not be used
|
3. Type Definitions：
Type Definitions
|
Description
|
typedef
intr_handle_t pcnt_isr_handle_t
|
4. Enumerations：
4.1. enum pcnt_ctrl_mode_t：
Selection of available modes that
determine the counter’s action depending on the state of the control signal’s
input GPIO.
Note：Configuration
covers two actions, one for high, and one for low level on the control input
Enumeration
|
Description
|
PCNT_MODE_KEEP = 0
|
Control mode: won’t change counter mode
|
PCNT_MODE_DISABLE = 1
|
Control mode: invert counter mode(increase -> decrease,
decrease -> increase)
|
PCNT_MODE_DISABLE = 2
|
Control mode: Inhibit counter(counter value will not
change in this condition)
|
PCNT_MODE_MAX
|
4.2. enum pcnt_count_mode_t：
Selection of available modes that
determine the counter’s action on the edge of the pulse signal’s input GPIO.
Note：Configuration
covers two actions, one for positive, and one for negative edge on the pulse
input
Enumeration
|
Description
|
PCNT_COUNT_DIS = 0
|
Counter mode: Inhibit counter(counter value will not
change in this condition)
|
PCNT_COUNT_INC = 1
|
Counter mode: Increase counter value
|
PCNT_COUNT_DEC = 2
|
Counter mode: Decrease counter value
|
PCNT_COUNT_MAX
|
4.3. enum pcnt_unit_t：
Selection of all available PCNT
units.
Enumeration
|
Description
|
PCNT_UNIT_0 = 0
|
PCNT unit 0
|
PCNT_UNIT_1 = 1
|
PCNT unit 1
|
PCNT_UNIT_2 = 2
|
PCNT unit 2
|
PCNT_UNIT_3 = 3
|
PCNT unit 3
|
PCNT_UNIT_4 = 4
|
PCNT unit 4
|
PCNT_UNIT_5 = 5
|
PCNT unit 5
|
PCNT_UNIT_6 = 6
|
PCNT unit 6
|
PCNT_UNIT_7 = 7
|
PCNT unit 7
|
PCNT_UNIT_MAX
|
4.4. enum pcnt_channel_t：
Selection of channels available
for a single PCNT unit.
Enumeration
|
Description
|
PCNT_CHANNEL_0 = 0x00
|
PCNT channel 0
|
PCNT_CHANNEL_1 = 0x01
|
PCNT channel 1
|
PCNT_CHANNEL_MAX
|
4.5. enum pcnt_evt_type_t：
Selection of counter’s events the
may trigger an interrupt.
Enumeration
|
Description
|
PCNT_EVT_L_LIM = 0
|
PCNT watch point event: Minimum counter value
|
PCNT_EVT_H_LIM = 1
|
PCNT watch point event: Maximum counter value
|
PCNT_EVT_THRES_0 = 2
|
PCNT watch point event: threshold0 value event
|
PCNT_EVT_THRES_1 = 3
|
PCNT watch point event: threshold1 value event
|
PCNT_EVT_ZERO = 4
|
PCNT watch point event: counter value zero event
|
PCNT_EVT_MAX
|
PCNT unit 5
|
相關網址：
※ DIY - ESP32：ESP32 PCNT 脈衝計數器電路（三十八）
※ DIY - ESP32：ESP32 PCNT 脈衝計數器程式（三十九）
※ DIY - ESP32：ESP32 PCNT API 函數模塊介紹（四十）
※ DIY - ESP32：ESP32 PCNT API 函數（四十一）
2018年 11月 30日 天氣報告
氣溫：22.1度 @ 22:00
相對濕度：百分之 64%
天氣：大致多雲
