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stm32: No need to use hardware oversampling in stm32h7_adc.c 

Not all chips implement hardware oversampling.  The software already
implements oversampling, and additional hardware oversampling is
unlikely to improve results.  Remove the hardware oversampling to
simplify the code.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2022-12-13 00:07:20 -05:00
parent efdc29f589
commit 876c3ffffd
1 changed files with 0 additions and 25 deletions
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25
src/stm32/stm32h7_adc.c
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@ -24,11 +24,6 @@
#if CONFIG_MACH_STM32H723
#define PCSEL PCSEL_RES0
#endif
// Number of samples is 2^OVERSAMPLES_EXPONENT (exponent can be 0-10)
#define OVERSAMPLES_EXPONENT 3
#define OVERSAMPLES (1 << OVERSAMPLES_EXPONENT)
#elif CONFIG_MACH_STM32L4
#define ADCIN_BANK_SIZE (19)
#define RCC_AHBENR_ADC (RCC->AHB2ENR)
@ -37,9 +32,6 @@
#define ADC_ATICKS (0b100)
#define ADC_RES (0b00)
#define ADC_TS (ADC12_COMMON)
#define OVERSAMPLES (0)
#elif CONFIG_MACH_STM32G4
#define ADCIN_BANK_SIZE (19)
#define RCC_AHBENR_ADC (RCC->AHB2ENR)
@ -49,8 +41,6 @@
#define ADC_RES (0b00)
#define ADC_TS (ADC12_COMMON)
#define ADC_CCR_TSEN (ADC_CCR_VSENSESEL)
#define OVERSAMPLES (0)
#endif
#define ADC_TEMPERATURE_PIN 0xfe
@ -301,21 +291,6 @@ gpio_adc_setup(uint32_t pin)
if (!is_stm32h723_adc3) {
MODIFY_REG(adc->CFGR, ADC_CFGR_RES_Msk, ADC_RES<<ADC_CFGR_RES_Pos);
}
#if CONFIG_MACH_STM32H7
// Set hardware oversampling
MODIFY_REG(adc->CFGR2, ADC_CFGR2_ROVSE_Msk, ADC_CFGR2_ROVSE);
if (is_stm32h723_adc3) {
#ifdef ADC3_CFGR2_OVSR
MODIFY_REG(adc->CFGR2, ADC3_CFGR2_OVSR_Msk,
(OVERSAMPLES_EXPONENT - 1) << ADC3_CFGR2_OVSR_Pos);
#endif
} else {
MODIFY_REG(adc->CFGR2, ADC_CFGR2_OVSR_Msk,
(OVERSAMPLES - 1) << ADC_CFGR2_OVSR_Pos);
}
MODIFY_REG(adc->CFGR2, ADC_CFGR2_OVSS_Msk,
OVERSAMPLES_EXPONENT << ADC_CFGR2_OVSS_Pos);
#endif
}
if (pin == ADC_TEMPERATURE_PIN) {