eren-terzioglu opened a new pull request, #16223:
URL: https://github.com/apache/nuttx/pull/16223
## Summary
Add dedicated gpio support to control pins with faster response time and
control multiple pins at the same time to applications requires faster response
time (.e.g SPI bitbang)
* arch/xtensa: Update common layer version for esp32s3
* Documentation/xtensa: Add dedicated GPIO docs for esp32[-s2|-s3]
* Documentation/risc-v: Add dedicated GPIO documentation for
esp32[-c3|-c6|-h2]
* boards/xtensa: Add dedicated GPIO board level support for esp32[-s2|-s3]
* arch/xtensa: Add dedicated GPIO support for esp32[-s2|-s3]
* boards/risc-v: Add dedicated GPIO board level support for
esp32[-c3|-c6|-h2]
* arch/risc-v: Add Dedicated GPIO support for esp32[c3|c6|h2]
* drivers/gpio: Add bundle ioctl commands
## Impact
Impact on user: No, new feature added
Impact on build: No, old defconfigs can be used without any issue
Impact on hardware: Yes, dedicated GPIO feature added
Impact on documentation:
Impact on security: No
Impact on compatibility: No, it is compatible with old defconfigs
## Testing
`esp32c6-devkitc:gpio`, `esp32s3-devkit:gpio` and `esp32s2-saola-1:gpio`
config used with `CONFIG_ESPRESSIF_DEDICATED_GPIO` option enabled.
### Building
<!-- Provide how to build the test for each SoC being tested -->
Commands used for building:
#### esp32c6
```
make distclean && ./tools/configure.sh esp32c6-devkitc:gpio && kconfig-tweak
-d NDEBUG; kconfig-tweak -e CONFIG_ESPRESSIF_DEDICATED_GPIO && make
olddefconfig && make -j && make download ESPTOOL_PORT=/dev/ttyUSB0
ESPTOOL_BAUD=115200 ESPTOOL_BINDIR=../esp-bins
```
#### esp32s2
```
make distclean && ./tools/configure.sh esp32s2-saola-1:gpio && kconfig-tweak
-d NDEBUG; kconfig-tweak -e CONFIG_ESPRESSIF_DEDICATED_GPIO && make
olddefconfig && make -j && make download ESPTOOL_PORT=/dev/ttyUSB0
ESPTOOL_BAUD=115200 ESPTOOL_BINDIR=../esp-bins
```
#### esp32s3
```
make distclean && ./tools/configure.sh esp32s3-devkit:gpio && kconfig-tweak
-d NDEBUG; kconfig-tweak -e CONFIG_ESPRESSIF_DEDICATED_GPIO && make
olddefconfig && make -j && make download ESPTOOL_PORT=/dev/ttyUSB0
ESPTOOL_BAUD=115200 ESPTOOL_BINDIR=../esp-bins
```
Sample app I used:
```
#include <nuttx/config.h>
#include <inttypes.h>
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <syslog.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <nuttx/ioexpander/gpio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <debug.h>
#define ESP_DEDIC_GPIO_PATH "/dev/gpio3"
#define COUNT_LIMIT 5
int main(int argc, char *argv[])
{
int fd;
int count = 0;
int rd_val = 0;
struct gpio_bundle_wr_arg_s wr_arg =
{
0
};
fd = open(ESP_DEDIC_GPIO_PATH, O_RDWR);
wr_arg.mask = 0xffff;
wr_arg.value = 1;
while (count < COUNT_LIMIT)
{
ioctl(fd, GPIOC_BUNDLE_WR, &wr_arg);
ioctl(fd, GPIOC_BUNDLE_RD, &rd_val);
printf("Read value: %d\n", rd_val);
wr_arg.value = !wr_arg.value;
count++;
usleep(1000000);
}
close(fd);
return OK;
}
```
### Results
<!-- Provide tests' results and runtime logs -->
Output should look like this:
```
esp_dedic_gpio_bundle_write: Writing 1 with mask: 65535
esp_dedic_gpio_bundle_read: Reading int pin...
Read value: 1
esp_dedic_gpio_bundle_write: Writing 0 with mask: 65535
esp_dedic_gpio_bundle_read: Reading int pin...
Read value: 0
esp_dedic_gpio_bundle_write: Writing 1 with mask: 65535
esp_dedic_gpio_bundle_read: Reading int pin...
Read value: 1
esp_dedic_gpio_bundle_write: Writing 0 with mask: 65535
esp_dedic_gpio_bundle_read: Reading int pin...
Read value: 0
esp_dedic_gpio_bundle_write: Writing 1 with mask: 65535
esp_dedic_gpio_bundle_read: Reading int pin...
Read value: 1
nsh>
```
I tested blink test without any delay and these are the results
#### C6 results with using POSIX calls
| Freq\Number of GPIO's | 1 | 2 |
|--------------------------------|-----------|-----------|
| Dedicated GPIO Blink Freq(khz) | 285 - 290 | 285 |
| Normal GPIO Blink Freq(khz) | 240 | 120 - 123 |
#### S3 results with using POSIX calls
| Freq\Number of GPIO's | 1 | 2 |
|--------------------------------|-----------|-----------|
| Dedicated GPIO Blink Freq(khz) | 475 | 475 |
| Normal GPIO Blink Freq(khz) | 421 | 210 |
#### S3 results with using arch calls (esp32s3_gpiowrite, ...)
| Freq\Number of GPIO's | 1 | 2 |
|--------------------------------|-----------|-----------|
| Dedicated GPIO Blink Freq(khz) | 5300 | 5300 |
| Normal GPIO Blink Freq(khz) | 4000 | 2000 |
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