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/*
* ADC functions on STM32F0
*
* Copyright (C) 2019 Eug Krashtan <eug.krashtan@gmail.com>
* This file may be distributed under the terms of the GNU GPLv3 license.
*
*/
#include <stdbool.h> // bool
#include "board/gpio.h" // gpio_adc_setup
#include "board/io.h" // readb
#include "stm32f0xx_hal.h"
#include "internal.h" // GPIO
#include "compiler.h" // ARRAY_SIZE
#include "command.h" // shutdown
#include "sched.h" // sched_shutdown
DECL_CONSTANT("ADC_MAX", 4095);
#define ADC_DELAY (240 * 8)
static bool adc_busy;
static uint8_t adc_current_channel;
ADC_HandleTypeDef hadc;
static const uint8_t adc_pins[] = {
GPIO('A', 0), GPIO('A', 1),
#if !(CONFIG_SERIAL)
GPIO('A', 2), GPIO('A', 3),
#endif
GPIO('A', 4), GPIO('A', 5), GPIO('A', 6), GPIO('A', 7),
GPIO('B', 1),
// Fake ADC on this GPIO (returns tempsensor value)
GPIO('B', 8)
};
static const uint32_t adc_channels[] = {
ADC_CHANNEL_0,
ADC_CHANNEL_1,
#if !(CONFIG_SERIAL)
ADC_CHANNEL_2,
ADC_CHANNEL_3,
#endif
ADC_CHANNEL_4,
ADC_CHANNEL_5,
ADC_CHANNEL_6,
ADC_CHANNEL_7,
ADC_CHANNEL_9,
// For tests
ADC_CHANNEL_TEMPSENSOR
};
struct gpio_adc
gpio_adc_setup(uint8_t pin)
{
// Find pin in adc_pins table
int chan;
ADC_ChannelConfTypeDef sConfig = {0};
for (chan=0; ; chan++) {
if (chan >= ARRAY_SIZE(adc_pins))
shutdown("Not a valid ADC pin");
if (adc_pins[chan] == pin) {
sConfig.Channel = adc_channels[chan];
break;
}
}
/**ADC GPIO Configuration
*/
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = 1 << (pin % 16);;
GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
GPIO_InitStruct.Pull = GPIO_NOPULL;
HAL_GPIO_Init((pin<8)?GPIOA:GPIOB, &GPIO_InitStruct);
/**Configure for the selected ADC regular channel to be converted.
*/
sConfig.Rank = ADC_RANK_CHANNEL_NUMBER;
sConfig.SamplingTime = ADC_SAMPLETIME_239CYCLES_5;
HAL_ADC_ConfigChannel(&hadc, &sConfig);
HAL_ADCEx_Calibration_Start(&hadc);
return (struct gpio_adc){ .pin = adc_channels[chan] };
}
// Try to sample a value. Returns zero if sample ready, otherwise
// returns the number of clock ticks the caller should wait before
// retrying this function.
uint32_t
gpio_adc_sample(struct gpio_adc g)
{
/* ADC not busy, start conversion */
if (!readb(&adc_busy)) {
HAL_ADC_Start(&hadc);
adc_busy = true;
adc_current_channel = g.pin;
return ADC_DELAY;
/* ADC finished conversion for this channel */
} else if (HAL_ADC_PollForConversion(&hadc, 100) == HAL_OK) {
__HAL_ADC_CLEAR_FLAG(&hadc, ADC_FLAG_EOS);
adc_busy = false;
return 0;
}
/* Wants to sample another channel, or not finished yet */
return ADC_DELAY;
}
// Read a value; use only after gpio_adc_sample() returns zero
uint16_t
gpio_adc_read(struct gpio_adc g)
{
return HAL_ADC_GetValue(&hadc);
}
// Cancel a sample that may have been started with gpio_adc_sample()
void
gpio_adc_cancel_sample(struct gpio_adc g)
{
if (readb(&adc_busy) && readl(&adc_current_channel) == g.pin) {
adc_busy = false;
HAL_ADC_Stop(&hadc);
}
}
/**
* @brief ADC Initialization Function
* @param None
* @retval None
*/
void AdcInit(void)
{
/**Configure the global features of the ADC (Clock,
* Resolution, Data Alignment and number of conversion)
*/
hadc.Instance = ADC1;
hadc.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc.Init.Resolution = ADC_RESOLUTION_12B;
hadc.Init.DataAlign = ADC_DATAALIGN_RIGHT;
hadc.Init.ScanConvMode = ADC_SCAN_DIRECTION_FORWARD;
hadc.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc.Init.LowPowerAutoWait = DISABLE;
hadc.Init.LowPowerAutoPowerOff = DISABLE;
hadc.Init.ContinuousConvMode = DISABLE;
hadc.Init.DiscontinuousConvMode = DISABLE;
hadc.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc.Init.DMAContinuousRequests = DISABLE;
hadc.Init.Overrun = ADC_OVR_DATA_OVERWRITTEN;
HAL_ADC_Init(&hadc);
}
DECL_INIT(AdcInit);
/**
* @brief ADC MSP Initialization
* @param hadc: ADC handle pointer
* @retval None
*/
void HAL_ADC_MspInit(ADC_HandleTypeDef* hadc)
{
if(hadc->Instance==ADC1)
{
/* Peripheral clock enable */
__HAL_RCC_ADC1_CLK_ENABLE();
__HAL_RCC_GPIOA_CLK_ENABLE();
}
}
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