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前往新版Gitcode,体验更适合开发者的 AI 搜索 >>
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bf21695b
编写于
12月 09, 2022
作者:
T
Tomáš Pilný
提交者:
GitHub
12月 08, 2022
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差异文件
Added example scanning maximum ledc frequencies (#7460)
上级
9b880929
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1 changed file
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+76
-0
libraries/ESP32/examples/AnalogOut/ledcFrequency/ledcFrequency.ino
.../ESP32/examples/AnalogOut/ledcFrequency/ledcFrequency.ino
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libraries/ESP32/examples/AnalogOut/ledcFrequency/ledcFrequency.ino
0 → 100644
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bf21695b
/*
* This sketch will map the maximum frequency depending on the bit resolution for the current SoC.
* Run the sketch and wait for the Final report.
* Ignore the error messages from incorrect settings such as these:
* "E (4190) ledc: requested frequency and duty resolution can not be achieved, try reducing freq_hz or duty_resolution. div_param=255"
*
* Date: 11 Nov 2022
* Author: Tomas Pilny
*/
#include "soc/soc_caps.h"
#define PIN 2
void
setup
()
{
analogWrite
(
PIN
,
128
);
uint32_t
min_frequency
;
uint32_t
max_frequency
;
uint32_t
frequency
;
uint32_t
successful_frequency
;
uint32_t
max_freq_array
[
SOC_LEDC_TIMER_BIT_WIDE_NUM
];
uint32_t
min_freq_array
[
SOC_LEDC_TIMER_BIT_WIDE_NUM
];
// Find Max Frequency
for
(
uint8_t
resolution
=
1
;
resolution
<=
SOC_LEDC_TIMER_BIT_WIDE_NUM
;
++
resolution
){
max_freq_array
[
resolution
-
1
]
=
0
;
min_frequency
=
0
;
max_frequency
=
UINT32_MAX
;
successful_frequency
=
0
;
while
(
min_frequency
!=
max_frequency
&&
min_frequency
+
1
!=
max_frequency
){
frequency
=
min_frequency
+
((
max_frequency
-
min_frequency
)
/
2
);
if
(
ledcChangeFrequency
(
analogGetChannel
(
PIN
),
frequency
,
resolution
)){
min_frequency
=
frequency
;
successful_frequency
=
frequency
;
}
else
{
max_frequency
=
frequency
;
}
}
// while not found the maximum
max_freq_array
[
resolution
-
1
]
=
successful_frequency
;
}
// for all resolutions
// Find Min Frequency
for
(
uint8_t
resolution
=
1
;
resolution
<=
SOC_LEDC_TIMER_BIT_WIDE_NUM
;
++
resolution
){
min_freq_array
[
resolution
-
1
]
=
0
;
min_frequency
=
0
;
max_frequency
=
max_freq_array
[
resolution
-
1
];
successful_frequency
=
max_frequency
;
while
(
min_frequency
!=
max_frequency
&&
min_frequency
+
1
!=
max_frequency
){
frequency
=
min_frequency
+
((
max_frequency
-
min_frequency
)
/
2
);
if
(
ledcChangeFrequency
(
analogGetChannel
(
PIN
),
frequency
,
resolution
)){
max_frequency
=
frequency
;
successful_frequency
=
frequency
;
}
else
{
min_frequency
=
frequency
;
}
}
// while not found the maximum
min_freq_array
[
resolution
-
1
]
=
successful_frequency
;
}
// for all resolutions
printf
(
"Bit resolution | Min Frequency [Hz] | Max Frequency [Hz]
\n
"
);
for
(
uint8_t
r
=
1
;
r
<=
SOC_LEDC_TIMER_BIT_WIDE_NUM
;
++
r
){
size_t
max_len
=
std
::
to_string
(
UINT32_MAX
).
length
();
printf
(
" %s%d | %s%u | %s%u
\n
"
,
std
::
string
(
2
-
std
::
to_string
(
r
).
length
(),
' '
).
c_str
(),
r
,
std
::
string
(
max_len
-
std
::
to_string
(
min_freq_array
[
r
-
1
]).
length
(),
' '
).
c_str
(),
min_freq_array
[
r
-
1
],
std
::
string
(
max_len
-
std
::
to_string
(
max_freq_array
[
r
-
1
]).
length
(),
' '
).
c_str
(),
max_freq_array
[
r
-
1
]);
}
}
void
loop
()
{
delay
(
1000
);
}
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