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Fix STM32 set right port mode bits for analog port

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This commit is contained in:
Harald Barth
2023-04-10 01:47:00 +02:00
parent 49c0a1a55a
commit bfa33a9df7
4 changed files with 21 additions and 6 deletions
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17
DCCTimerSTM32.cpp
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@@ -240,7 +240,10 @@ int ADCee::init(uint8_t pin) {
int value = 0;
PinName stmpin = analogInputToPinName(pin);
uint32_t stmgpio = stmpin / 16; // 16-bits per GPIO port group on STM32
if (stmpin == NC) // do not continue if this is not an analog pin at all
return -1024; // some silly value as error
uint32_t stmgpio = STM_PORT(stmpin); // converts to the GPIO port (16-bits per port group on STM32)
uint32_t adcchan = STM_PIN_CHANNEL(pinmap_function(stmpin, PinMap_ADC)); // find ADC channel (only valid for ADC1!)
GPIO_TypeDef * gpioBase;
@@ -258,12 +261,20 @@ int ADCee::init(uint8_t pin) {
RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN; //Power up PORTC
gpioBase = GPIOC;
break;
default:
return -1023; // some silly value as error
}
// Set pin mux mode to analog input
gpioBase->MODER |= (0b011 << (stmpin << 1)); // Set pin mux to analog mode
// Set pin mux mode to analog input, the 32 bit port mode register has 2 bits per pin
gpioBase->MODER |= (0b011 << (STM_PIN(stmpin) << 1)); // Set pin mux to analog mode (binary 11)
// Set the sampling rate for that analog input
// This is F411x specific! Different on for example F334
// STM32F11xC/E Reference manual
// 11.12.4 ADC sample time register 1 (ADC_SMPR1) (channels 10 to 18)
// 11.12.5 ADC sample time register 2 (ADC_SMPR2) (channels 0 to 9)
if (adcchan > 18)
return -1022; // silly value as error
if (adcchan < 10)
ADC1->SMPR2 |= (0b111 << (adcchan * 3)); // Channel sampling rate 480 cycles
else