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stm32h7:adc fix temperature sensing

This commit is contained in:
David Sidrane 2021-03-19 02:32:08 -07:00 committed by Lorenz Meier
parent cc098f9dff
commit 833501dee6
1 changed files with 15 additions and 0 deletions
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15
platforms/nuttx/src/px4/stm/stm32h7/adc/adc.cpp
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@ -40,6 +40,14 @@
#include <stm32_adc.h>
#include <stm32_gpio.h>
/*
* If there is only one ADC in use in PX4 and it is not
* ADC3 we still need ADC3 for temperature sensing.
*/
#if SYSTEM_ADC_COUNT == 1 && SYSTEM_ADC_BASE != STM32_ADC3_BASE
# undef SYSTEM_ADC_COUNT
# define SYSTEM_ADC_COUNT 2
#endif
/*
* Register accessors.
@ -280,8 +288,15 @@ uint32_t px4_arch_adc_sample(uint32_t base_address, unsigned channel)
/* Add a channel mapping for ADC3 on the H7 */
if (channel == PX4_ADC_INTERNAL_TEMP_SENSOR_CHANNEL) {
static bool once = false;
channel = ADC3_INTERNAL_TEMP_SENSOR_CHANNEL;
base_address = STM32_ADC3_BASE;
// Init it once (px4_arch_adc_init does this as well, but this is less cycles)
if (!once) {
once = true;
px4_arch_adc_init(base_address);
}
}