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stm32: Support reading chip based temperature sensor on stm32f1/2/4 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2020-10-07 11:15:02 -04:00
parent d9b7891133
commit d985b53ccb
1 changed files with 24 additions and 5 deletions
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27
src/stm32/adc.c
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@ -1,6 +1,6 @@
// ADC functions on STM32 // ADC functions on STM32
// //
// Copyright (C) 2019 Kevin O'Connor <kevin@koconnor.net> // Copyright (C) 2019-2020 Kevin O'Connor <kevin@koconnor.net>
// //
// This file may be distributed under the terms of the GNU GPLv3 license. // This file may be distributed under the terms of the GNU GPLv3 license.
@ -15,11 +15,23 @@
DECL_CONSTANT("ADC_MAX", 4095); DECL_CONSTANT("ADC_MAX", 4095);
#define ADC_TEMPERATURE_PIN 0xfe
DECL_ENUMERATION("pin", "ADC_TEMPERATURE", ADC_TEMPERATURE_PIN);
static const uint8_t adc_pins[] = { static const uint8_t adc_pins[] = {
GPIO('A', 0), GPIO('A', 1), GPIO('A', 2), GPIO('A', 3), GPIO('A', 0), GPIO('A', 1), GPIO('A', 2), GPIO('A', 3),
GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7), GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7),
GPIO('B', 0), GPIO('B', 1), GPIO('C', 0), GPIO('C', 1), GPIO('B', 0), GPIO('B', 1), GPIO('C', 0), GPIO('C', 1),
GPIO('C', 2), GPIO('C', 3), GPIO('C', 4), GPIO('C', 5), GPIO('C', 2), GPIO('C', 3), GPIO('C', 4), GPIO('C', 5),
#if CONFIG_MACH_STM32F1
ADC_TEMPERATURE_PIN,
#elif CONFIG_MACH_STM32F2 || CONFIG_MACH_STM32F407
ADC_TEMPERATURE_PIN, 0x00, 0x00,
#elif CONFIG_MACH_STM32F446
0x00, 0x00, ADC_TEMPERATURE_PIN,
#endif
#if CONFIG_MACH_STM32F4 #if CONFIG_MACH_STM32F4
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
GPIO('F', 6), GPIO('F', 7), GPIO('F', 8), GPIO('F', 9), GPIO('F', 6), GPIO('F', 7), GPIO('F', 8), GPIO('F', 9),
@ -29,7 +41,8 @@ static const uint8_t adc_pins[] = {
}; };
#if CONFIG_MACH_STM32F1 #if CONFIG_MACH_STM32F1
#define CR2_FLAGS (ADC_CR2_ADON | (7 << ADC_CR2_EXTSEL_Pos) | ADC_CR2_EXTTRIG) #define CR2_FLAGS (ADC_CR2_ADON | (7 << ADC_CR2_EXTSEL_Pos) | ADC_CR2_EXTTRIG \
| ADC_CR2_TSVREFE)
#else #else
#define CR2_FLAGS ADC_CR2_ADON #define CR2_FLAGS ADC_CR2_ADON
#endif #endif
@ -71,11 +84,11 @@ gpio_adc_setup(uint32_t pin)
ADC_TypeDef *adc = ADC1; ADC_TypeDef *adc = ADC1;
uint32_t adc_base = ADC1_BASE; uint32_t adc_base = ADC1_BASE;
#if CONFIG_MACH_STM32F4 #if CONFIG_MACH_STM32F4
if (chan >= 16) { if (chan >= 19) {
// On the STM32F4, some ADC channels are only available from ADC3 // On the STM32F4, some ADC channels are only available from ADC3
adc = ADC3; adc = ADC3;
adc_base += 0x800; adc_base += 0x800;
chan -= 16; chan -= 19;
} }
#endif #endif
@ -94,7 +107,13 @@ gpio_adc_setup(uint32_t pin)
adc->CR2 = CR2_FLAGS; adc->CR2 = CR2_FLAGS;
} }
if (pin == ADC_TEMPERATURE_PIN) {
#if !CONFIG_MACH_STM32F1
ADC123_COMMON->CCR = ADC_CCR_TSVREFE;
#endif
} else {
gpio_peripheral(pin, GPIO_ANALOG, 0); gpio_peripheral(pin, GPIO_ANALOG, 0);
}
return (struct gpio_adc){ .adc = adc, .chan = chan }; return (struct gpio_adc){ .adc = adc, .chan = chan };
} }