RIOT-OS/RIOT
RIOT-OS/RIOT
1
0
Fork 0
mirror of https://github.com/RIOT-OS/RIOT.git synced 2025-01-18 12:52:44 +01:00
Code Releases Activity

Merge pull request #17400 from maribu/cpu/nrf5x_common/periph_temperature

Browse Source 
cpu/nrf5x_common/periph_temperature: Increase resolution
This commit is contained in:
benpicco 2021-12-15 18:53:50 +01:00 committed by GitHub
commit 570d29c05c
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 12 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
cpu/nrf5x_common/periph/temperature.c
View File

@ -24,7 +24,11 @@
#include "saul_reg.h"
#include "phydat.h"
void temperature_read(int16_t *temp)
/**
* @brief Read the temperature in E-02 °C
* @return The measured temperature in E-02 °C (e.g. 1825 would mean 18.25 °C)
*/
static int16_t temperature_read(void)
{
/* Start temperature measurement task */
NRF_TEMP->TASKS_START = 1;
@ -32,22 +36,24 @@ void temperature_read(int16_t *temp)
/* Wait for temperature measurement to be ready */
while (!NRF_TEMP->EVENTS_DATARDY); /* takes 36us according to manual */
/* temperature is in 0.25°C step, so just divide by 4 */
*temp = (int16_t)NRF_TEMP->TEMP >> 2;
/* temperature is in 0.25°C step, multiply by 25 to convert to E-02 °C */
int32_t temp = NRF_TEMP->TEMP * 25;
/* Clear data ready bit and stop temperature measurement task */
NRF_TEMP->EVENTS_DATARDY = 0;
NRF_TEMP->TASKS_STOP = 1;
return temp;
}
static int _read_temperature(const void *dev, phydat_t *res)
{
(void) dev;
temperature_read(&res->val[0]);
(void)dev;
res->val[0] = temperature_read();
res->val[1] = 0;
res->val[2] = 0;
res->unit = UNIT_TEMP_C;
res->scale = 0;
res->scale = -2;
return 1;
}