kywwilson11 opened a new pull request, #16746:
URL: https://github.com/apache/nuttx/pull/16746
## Summary
This commit adds full support for the on‑die digital temperature sensor
(DTS) in the STM32H5 family:
- **Driver**: Implements `stm32h5_dts` low‑level driver
(`chip/stm32_dts.[ch]`) with:
- Software trigger, CFGR1 configuration (sample time, reference clock,
trigger source)
- Raw → frequency → °C conversion using factory calibration registers
- Interrupt support for end‑of‑measurement, high/low threshold (both
synchronous and LSE‑only asynchronous wakeup)
- `get_info()` updated with realistic sensor parameters
- Currently no support for HW Triggers. set_interval not developed. Need
LP Timer support first.
- **Kconfig**: New options under `Drivers → Sensors → STM32H5 DTS`:
- `CONFIG_STM32H5_DTS` to enable the driver
- `CONFIG_STM32H5_DTS_REFCLK_LSE` to select LSE vs PCLK
- `CONFIG_STM32H5_DTS_SMP_TIME` for TS1_SMP_TIME
- Interrupt‑enable flags for ITEF/ITLF/ITHF and AITEF/AITLF/AITHF
- **Build**: Updated `Kconfig` and `Make.defs` so the peripheral clock
(APB1HENR DTSEN) and driver files are included when enabled
- **uORB**: Exposes `/dev/uorb/sensor_tempN` via the NuttX sensors framework
## Impact
- **New functionality**: Enables temperature sensing on with DTS
STM32H5‑based boards (e.g., NUCLEO‑H563ZI)
- **Build-time**: Zero impact unless `CONFIG_STM32H5_DTS=y`
- **Runtime**: Negligible idle overhead; active only during measurements or
threshold events
- **Compatibility**: No changes to other families; coexists with existing
sensors drivers
## Testing
Modes: PCLK and LSE
Interupts: Did not test hardware trigger mode. But enabled interrupts while
in SW trigger mode. isr was accessed and fetch was not affected.
Samples: Tested number of samples. Verified with debugger.
Wrote a very simple external app to test. See below.
Not shown here but I heated and cooled the chip and watched changes. Below
output is with 125MHz PCLK1.
Example Output:
```console
NuttShell (NSH) NuttX-12.10.0
nsh> dts
Time: 2550000 µs Temp: 29.39 °C
nsh> dts
Time: 3840000 µs Temp: 29.39 °C
nsh> dts
Time: 4950000 µs Temp: 29.39 °C
nsh> dts
Time: 6060000 µs Temp: 29.26 °C
nsh> dts
Time: 7740000 µs Temp: 29.39 °C
nsh>
```
Kconfig options:
<img width="723" height="318" alt="dts_kconfig"
src="https://github.com/user-attachments/assets/3c91eb84-5c2c-476a-95e3-e1a3b6635590";
/>
External Test Application:
```
#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <nuttx/sensors/ioctl.h>
#include <nuttx/sensors/sensor.h>
#include <nuttx/uorb.h>
int main(void)
{
int usfd = open("/dev/usensor", O_RDWR);
if (usfd < 0)
{
perror("open /dev/usensor");
return 1;
}
struct sensor_reginfo_s reginfo =
{
.path = "/dev/uorb/sensor_temp", /* note: no trailing ‘0’ */
.esize = sizeof(struct sensor_temp),
.nbuffer= 1
};
if (ioctl(usfd, SNIOC_REGISTER, (unsigned long)®info) < 0)
{
}
close(usfd);
int fd = open("/dev/uorb/sensor_temp0", O_RDONLY | O_NONBLOCK);
if (fd < 0) { perror("open"); return 1; }
struct sensor_temp report;
for (int i = 0; i < 1; i++)
{
if (read(fd, &report, sizeof(report)) != sizeof(report))
{
perror("read");
break;
}
printf("Time: %llu µs Temp: %.2f °C\n",
(unsigned long long)report.timestamp,
report.temperature);
}
close(fd);
return 0;
}
```
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