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atsamd: Support reading chip based temperature sensor 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-10-07 13:59:26 -04:00
parent 9142200b3a
commit be4ad29fa3
1 changed files with 15 additions and 1 deletions
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16
src/atsamd/adc.c
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@ -1,6 +1,6 @@
// Analog to Digital Converter support
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
// Copyright (C) 2018-2020 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
@ -9,6 +9,8 @@
#include "internal.h" // GPIO
#include "sched.h" // sched_shutdown
#define ADC_TEMPERATURE_PIN 0xfe
DECL_ENUMERATION("pin", "ADC_TEMPERATURE", ADC_TEMPERATURE_PIN);
#if CONFIG_MACH_SAMD21
@ -128,6 +130,18 @@ gpio_adc_setup(uint8_t pin)
// Enable ADC
adc_init();
if (pin == ADC_TEMPERATURE_PIN) {
#if CONFIG_MACH_SAMD21
SYSCTRL->VREF.reg |= SYSCTRL_VREF_TSEN;
return (struct gpio_adc){ .regs=ADC,
.chan=ADC_INPUTCTRL_MUXPOS_TEMP_Val };
#else
SUPC->VREF.reg |= SUPC_VREF_TSEN;
return (struct gpio_adc){ .regs=ADC0,
.chan=ADC_INPUTCTRL_MUXPOS_PTAT_Val };
#endif
}
// Set pin in ADC mode
gpio_peripheral(pin, 'B', 0);