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cpu/nrf52: add SAUL driver for VDDH sensor

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This commit is contained in:
Benjamin Valentin 2021-02-13 23:37:02 +01:00
parent c3170b93d8
commit f3c1106c9e
4 changed files with 71 additions and 0 deletions
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4
cpu/nrf52/Makefile.dep
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@ -22,5 +22,9 @@ ifneq (,$(filter periph_uart_nonblocking,$(USEMODULE)))
USEMODULE += tsrb
endif
ifneq (,$(filter saul_nrf_vddh,$(USEMODULE)))
FEATURES_REQUIRED += periph_adc
endif
include $(RIOTCPU)/nrf5x_common/Makefile.dep
include $(RIOTCPU)/cortexm_common/Makefile.dep

62
drivers/saul/init_devs/auto_init_saul_nrf_vddh.c Normal file
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@ -0,0 +1,62 @@
/*
* Copyright (C) 2021 ML!PA Consulting GmbH
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*
*/
/**
* @ingroup sys_auto_init_saul
* @{
*
* @file
* @brief Auto initialization of internal voltage sensor directly mapped to SAUL reg
*
* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
*
* @}
*/
#include "cpu.h"
#include "log.h"
#include "saul_reg.h"
#include "saul/periph.h"
#include "periph/adc.h"
static int _read_voltage(const void *dev, phydat_t *res)
{
(void)dev;
/* GPIO reference voltage / external output supply voltage in high voltage mode */
const uint8_t vref_deci_volt[] = { 18, 21, 24, 27, 30, 33, 0, 18 };
uint8_t idx = NRF_UICR->REGOUT0 & UICR_REGOUT0_VOUT_Msk;
int raw = adc_sample(NRF52_VDDHDIV5, ADC_RES_12BIT) * 5 * vref_deci_volt[idx] * 100;
res->val[0] = raw >> 12;
res->unit = UNIT_V;
res->scale = -3;
return 1;
}
static saul_driver_t nrf_vddh_saul_driver = {
.read = _read_voltage,
.write = saul_notsup,
.type = SAUL_SENSE_VOLTAGE,
};
void auto_init_nrf_vddh(void)
{
static saul_reg_t saul_reg_entry = {
.dev = NULL,
.name = "NRF_VDDH",
.driver = &nrf_vddh_saul_driver,
};
adc_init(NRF52_VDDHDIV5);
/* add to registry */
saul_reg_add(&(saul_reg_entry));
}

4
drivers/saul/init_devs/init.c
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@ -43,6 +43,10 @@ void saul_init_devs(void)
extern void auto_init_nrf_temperature(void);
auto_init_nrf_temperature();
}
if (IS_USED(MODULE_SAUL_NRF_VDDH)) {
extern void auto_init_nrf_vddh(void);
auto_init_nrf_vddh();
}
if (IS_USED(MODULE_AD7746)) {
extern void auto_init_ad7746(void);
auto_init_ad7746();

1
makefiles/pseudomodules.inc.mk
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@ -121,6 +121,7 @@ PSEUDOMODULES += saul_adc
PSEUDOMODULES += saul_default
PSEUDOMODULES += saul_gpio
PSEUDOMODULES += saul_nrf_temperature
PSEUDOMODULES += saul_nrf_vddh
PSEUDOMODULES += saul_pwm
PSEUDOMODULES += scanf_float
PSEUDOMODULES += sched_cb