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Documentation/risc-v: Add dedicated GPIO documentation for esp32[-c3|-c6|-h2]

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Add dedicated GPIO documentation for risc-v based Espressif chips

Signed-off-by: Eren Terzioglu <eren.terzioglu@espressif.com>
This commit is contained in:
Eren Terzioglu
2025-04-09 11:07:48 +02:00
committed by Mateusz Szafoni
parent d471609267
commit e9eaafd154
7 changed files with 143 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Documentation/platforms/risc-v/esp32c3/boards/esp32c3-generic/index.rst
+35
View File
@@ -221,6 +221,41 @@ We can use the interrupt pin to send a signal when the interrupt fires::
The pin is configured as a rising edge interrupt, so after issuing the
above command, connect it to 3.3V.
To use dedicated gpio for controlling multiple gpio pin at the same time
or having better response time, you need to enable
`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
for faster response times required applications like simulate serial/parallel
interfaces in a bit-banging way.
After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
as input/output mode. These pins are for example, you can use any pin up to 8 pins for
input and 8 pins for output for dedicated gpio.
To write and read data from dedicated gpio, you need to use
`write` and `read` calls.
The following snippet demonstrates how to read/write to dedicated GPIO pins:
.. code-block:: C
int fd; = open("/dev/dedic_gpio0", O_RDWR);
int rd_val = 0;
int wr_mask = 0xffff;
int wr_val = 3;
while(1)
{
write(fd, &wr_val, wr_mask);
if (wr_val == 0)
{
wr_val = 3;
}
else
{
wr_val = 0;
}
read(fd, &rd_val, sizeof(uint32_t));
printf("rd_val: %d", rd_val);
}
i2c
---
Documentation/platforms/risc-v/esp32c3/index.rst
+1 -1
View File
@@ -356,7 +356,7 @@ CAN/TWAI Yes
DMA No
DS No
eFuse Yes Also virtual mode supported
GPIO Yes
GPIO Yes Dedicated GPIO supported
HMAC No
I2C Yes Master and Slave mode supported
I2S Yes
Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitc/index.rst
+35
View File
@@ -204,6 +204,41 @@ We can use the interrupt pin to send a signal when the interrupt fires::
The pin is configured as a rising edge interrupt, so after issuing the
above command, connect it to 3.3V.
To use dedicated gpio for controlling multiple gpio pin at the same time
or having better response time, you need to enable
`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
for faster response times required applications like simulate serial/parallel
interfaces in a bit-banging way.
After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
as input/output mode. These pins are for example, you can use any pin up to 8 pins for
input and 8 pins for output for dedicated gpio.
To write and read data from dedicated gpio, you need to use
`write` and `read` calls.
The following snippet demonstrates how to read/write to dedicated GPIO pins:
.. code-block:: C
int fd; = open("/dev/dedic_gpio0", O_RDWR);
int rd_val = 0;
int wr_mask = 0xffff;
int wr_val = 3;
while(1)
{
write(fd, &wr_val, wr_mask);
if (wr_val == 0)
{
wr_val = 3;
}
else
{
wr_val = 0;
}
read(fd, &rd_val, sizeof(uint32_t));
printf("rd_val: %d", rd_val);
}
i2c
---
Documentation/platforms/risc-v/esp32c6/boards/esp32c6-devkitm/index.rst
+35
View File
@@ -167,6 +167,41 @@ We can use the interrupt pin to send a signal when the interrupt fires::
The pin is configured as a rising edge interrupt, so after issuing the
above command, connect it to 3.3V.
To use dedicated gpio for controlling multiple gpio pin at the same time
or having better response time, you need to enable
`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
for faster response times required applications like simulate serial/parallel
interfaces in a bit-banging way.
After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
as input/output mode. These pins are for example, you can use any pin up to 8 pins for
input and 8 pins for output for dedicated gpio.
To write and read data from dedicated gpio, you need to use
`write` and `read` calls.
The following snippet demonstrates how to read/write to dedicated GPIO pins:
.. code-block:: C
int fd; = open("/dev/dedic_gpio0", O_RDWR);
int rd_val = 0;
int wr_mask = 0xffff;
int wr_val = 3;
while(1)
{
write(fd, &wr_val, wr_mask);
if (wr_val == 0)
{
wr_val = 3;
}
else
{
wr_val = 0;
}
read(fd, &rd_val, sizeof(uint32_t));
printf("rd_val: %d", rd_val);
}
i2c
---
Documentation/platforms/risc-v/esp32c6/index.rst
+1 -1
View File
@@ -344,7 +344,7 @@ CAN/TWAI Yes
DMA Yes
ECC No
eFuse Yes
GPIO Yes
GPIO Yes Dedicated GPIO supported
HMAC No
I2C Yes Master and Slave mode supported
I2S Yes
Documentation/platforms/risc-v/esp32h2/boards/esp32h2-devkit/index.rst
+35
View File
@@ -187,6 +187,41 @@ We can use the interrupt pin to send a signal when the interrupt fires::
The pin is configured as a rising edge interrupt, so after issuing the
above command, connect it to 3.3V.
To use dedicated gpio for controlling multiple gpio pin at the same time
or having better response time, you need to enable
`CONFIG_ESPRESSIF_DEDICATED_GPIO` option. Dedicated GPIO is suitable
for faster response times required applications like simulate serial/parallel
interfaces in a bit-banging way.
After this option enabled GPIO4 and GPIO5 pins are ready to used as dedicated GPIO pins
as input/output mode. These pins are for example, you can use any pin up to 8 pins for
input and 8 pins for output for dedicated gpio.
To write and read data from dedicated gpio, you need to use
`write` and `read` calls.
The following snippet demonstrates how to read/write to dedicated GPIO pins:
.. code-block:: C
int fd; = open("/dev/dedic_gpio0", O_RDWR);
int rd_val = 0;
int wr_mask = 0xffff;
int wr_val = 3;
while(1)
{
write(fd, &wr_val, wr_mask);
if (wr_val == 0)
{
wr_val = 3;
}
else
{
wr_val = 0;
}
read(fd, &rd_val, sizeof(uint32_t));
printf("rd_val: %d", rd_val);
}
i2c
---
Documentation/platforms/risc-v/esp32h2/index.rst
+1 -1
View File
@@ -346,7 +346,7 @@ DMA Yes
DS No
ECC No
eFuse Yes
GPIO Yes
GPIO Yes Dedicated GPIO supported
HMAC No
I2C Yes Master and Slave mode supported
I2S Yes