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cpu/board: added ADC driver for stm32f4discovery

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This commit is contained in:
Hauke Petersen 2014-07-17 00:57:19 +02:00
parent 5e8517d956
commit b451de05e4
2 changed files with 209 additions and 43 deletions
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67
boards/stm32f4discovery/include/periph_conf.h
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@ -109,57 +109,38 @@
* @name ADC configuration
* @{
*/
#define ADC_NUMOF (0U)
#define ADC_0_EN 0
#define ADC_1_EN 0
#define ADC_NUMOF (2U)
#define ADC_0_EN 1
#define ADC_1_EN 1
#define ADC_MAX_CHANNELS 2
/* ADC 0 configuration */
#define ADC_0_DEV ADC1 /* TODO !!!!!!! */
#define ADC_0_SAMPLE_TIMER
#define ADC_0_DEV ADC1
#define ADC_0_CHANNELS 2
#define ADC_0_CLKEN() (RCC->APB2ENR |= RCC_APB2ENR_ADC1EN)
#define ADC_0_CLKDIS() (RCC->APB2ENR &= ~(RCC_APB2ENR_ADC1EN))
#define ADC_0_PORT GPIOA
#define ADC_0_PORT_CLKEN() (RCC->AHB1ENR |= RCC_AHB1ENR_GPIOAEN)
/* ADC 0 channel 0 pin config */
#define ADC_0_C0_PORT
#define ADC_0_C0_PIN
#define ADC_0_C0_CLKEN()
#define ADC_0_C0_AFCFG()
#define ADC_0_CH0 1
#define ADC_0_CH0_PIN 1
/* ADC 0 channel 1 pin config */
#define ADC_0_C1_PORT
#define ADC_0_C1_PIN
#define ADC_0_C1_CLKEN()
#define ADC_0_C1_AFCFG()
/* ADC 0 channel 2 pin config */
#define ADC_0_C2_PORT
#define ADC_0_C2_PIN
#define ADC_0_C2_CLKEN()
#define ADC_0_C2_AFCFG()
/* ADC 0 channel 3 pin config */
#define ADC_0_C3_PORT
#define ADC_0_C3_PIN
#define ADC_0_C3_CLKEN()
#define ADC_0_C3_AFCFG()
#define ADC_0_CH1 4
#define ADC_0_CH1_PIN 4
/* ADC 0 configuration */
#define ADC_1_DEV ADC2 /* TODO !!!!!!! */
#define ADC_1_SAMPLE_TIMER
#define ADC_1_DEV ADC2
#define ADC_1_CHANNELS 2
#define ADC_1_CLKEN() (RCC->APB2ENR |= RCC_APB2ENR_ADC2EN)
#define ADC_1_CLKDIS() (RCC->APB2ENR &= ~(RCC_APB2ENR_ADC2EN))
#define ADC_1_PORT GPIOC
#define ADC_1_PORT_CLKEN() (RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN)
/* ADC 0 channel 0 pin config */
#define ADC_1_C0_PORT
#define ADC_1_C0_PIN
#define ADC_1_C0_CLKEN()
#define ADC_1_C0_AFCFG()
#define ADC_1_CH0 11
#define ADC_1_CH0_PIN 1
/* ADC 0 channel 1 pin config */
#define ADC_1_C1_PORT
#define ADC_1_C1_PIN
#define ADC_1_C1_CLKEN()
#define ADC_1_C1_AFCFG()
/* ADC 0 channel 2 pin config */
#define ADC_1_C2_PORT
#define ADC_1_C2_PIN
#define ADC_1_C2_CLKEN()
#define ADC_1_C2_AFCFG()
/* ADC 0 channel 3 pin config */
#define ADC_1_C3_PORT
#define ADC_1_C3_PIN
#define ADC_1_C3_CLKEN()
#define ADC_1_C3_AFCFG()
#define ADC_1_CH1 12
#define ADC_1_CH1_PIN 2
/** @} */

185
cpu/stm32f4/periph/adc.c Normal file
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@ -0,0 +1,185 @@
/*
* Copyright (C) 2014 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup cpu_stm32f4
* @{
*
* @file
* @brief Low-level ADC driver implementation
*
* @author Hauke Petersen <hauke.petersen@fu-berlin.de>
*
* @}
*/
#include "cpu.h"
#include "periph/adc.h"
#include "periph_conf.h"
/* guard in case that no ADC device is defined */
#if ADC_NUMOF
typedef struct {
int max_value;
} adc_config_t;
adc_config_t adc_config[ADC_NUMOF];
int adc_init(adc_t dev, adc_precision_t precision)
{
ADC_TypeDef *adc = 0;
adc_poweron(dev);
switch (dev) {
#if ADC_0_EN
case ADC_0:
adc = ADC_0_DEV;
ADC_0_PORT_CLKEN();
ADC_0_PORT->MODER |= (3 << (ADC_0_CH0_PIN * 2) | 3 << (ADC_0_CH1_PIN * 2));
break;
#endif
#if ADC_1_EN
case ADC_1:
adc = ADC_1_DEV;
ADC_1_PORT_CLKEN();
ADC_1_PORT->MODER |= (3 << (ADC_1_CH0_PIN * 2) | 3 << (ADC_1_CH1_PIN * 2));
break;
#endif
default:
return -1;
}
/* reset control registers */
adc->CR1 = 0;
adc->CR2 = 0;
adc->SQR1 = 0;
/* set precision */
switch (precision) {
case ADC_RES_6BIT:
adc->CR1 |= ADC_CR1_RES_0 | ADC_CR1_RES_1;
adc_config[dev].max_value = 0x3f;
break;
case ADC_RES_8BIT:
adc->CR1 |= ADC_CR1_RES_1;
adc_config[dev].max_value = 0xff;
break;
case ADC_RES_10BIT:
adc->CR1 |= ADC_CR1_RES_0;
adc_config[dev].max_value = 0x3ff;
break;
case ADC_RES_12BIT:
adc_config[dev].max_value = 0xfff;
break;
case ADC_RES_14BIT:
case ADC_RES_16BIT:
adc_poweroff(dev);
return -1;
break;
}
/* set clock prescaler */
ADC->CCR = (3 << 16); /* ADC clock = 10,5MHz */
/* enable the ADC module */
adc->CR2 |= ADC_CR2_ADON;
return 0;
}
int adc_sample(adc_t dev, int channel)
{
ADC_TypeDef *adc = 0;
switch (dev) {
#if ADC_0_EN
case ADC_0:
adc = ADC_0_DEV;
switch (channel) {
case 0:
adc->SQR3 = ADC_0_CH0 & 0x1f;
break;
case 1:
adc->SQR3 = ADC_0_CH1 & 0x1f;
break;
default:
return -1;
}
break;
#endif
#if ADC_1_EN
case ADC_1:
adc = ADC_1_DEV;
switch (channel) {
case 0:
adc->SQR3 = ADC_1_CH0 & 0x1f;
break;
case 1:
adc->SQR3 = ADC_1_CH1 & 0x1f;
break;
default:
return -1;
}
break;
#endif
}
/* start single conversion */
adc->CR2 |= ADC_CR2_SWSTART;
/* wait until conversion is complete */
while (!(adc->SR & ADC_SR_EOC));
/* read and return result */
return (int)adc->DR;
}
void adc_poweron(adc_t dev)
{
switch (dev) {
#if ADC_0_EN
case ADC_0:
ADC_0_CLKEN();
break;
#endif
#if ADC_1_EN
case ADC_1:
ADC_1_CLKEN();
break;
#endif
}
}
void adc_poweroff(adc_t dev)
{
switch (dev) {
#if ADC_0_EN
case ADC_0:
ADC_0_CLKDIS();
break;
#endif
#if ADC_1_EN
case ADC_1:
ADC_1_CLKDIS();
break;
#endif
}
}
int adc_map(adc_t dev, int value, int min, int max)
{
return (int)adc_mapf(dev, value, (float)min, (float)max);
}
float adc_mapf(adc_t dev, int value, float min, float max)
{
return ((max - min) / ((float)adc_config[dev].max_value)) * value;
}
#endif /* ADC_NUMOF */