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boards/arduino-atmega-common: support for PWM

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Victor Arino 2017-08-03 14:02:21 +02:00 committed by Sebastian Meiling
parent 2ebb187ca9
commit 8ff8aefb72
3 changed files with 45 additions and 0 deletions
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1
boards/common/arduino-atmega/Makefile.features
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@ -9,6 +9,7 @@ FEATURES_PROVIDED += periph_uart
# Various other features (if any) # Various other features (if any)
ifeq (,$(filter jiminy-mega256rfr2,$(BOARD))) ifeq (,$(filter jiminy-mega256rfr2,$(BOARD)))
FEATURES_PROVIDED += arduino FEATURES_PROVIDED += arduino
FEATURES_PROVIDED += periph_pwm
endif endif
# The board MPU family (used for grouping by the CI system) # The board MPU family (used for grouping by the CI system)

42
boards/common/arduino-atmega/include/periph_conf.h
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@ -24,6 +24,8 @@
#ifndef PERIPH_CONF_H #ifndef PERIPH_CONF_H
#define PERIPH_CONF_H #define PERIPH_CONF_H
#include "periph_cpu.h"
#ifdef __cplusplus #ifdef __cplusplus
extern "C" { extern "C" {
#endif #endif
@ -163,6 +165,46 @@ extern "C" {
#endif #endif
/** @} */ /** @} */
/**
* @name PWM configuration
*
* The current implementation supports only 8-bit timers for PWM generation.
* These timers are typically timer 0 and timer 2 in Atmega2560/1281/328p.
*
* Setting the first channel to GPIO_UNDEF allows multiple resolutions for the
* PWM channel. Otherwise the resolution is fixed to 256, allowing duty cycle
* values ranging from 0 to 255.
*
* @{
*/
#if defined(CPU_ATMEGA328P)
#define PWM_PINS_CH0 { GPIO_PIN(PORT_D, 6), GPIO_PIN(PORT_D, 5) }
#define PWM_PINS_CH1 { GPIO_PIN(PORT_B, 3), GPIO_PIN(PORT_D, 3) }
#elif defined(CPU_ATMEGA2560)
#define PWM_PINS_CH0 { GPIO_PIN(PORT_B, 7), GPIO_PIN(PORT_G, 5) }
#define PWM_PINS_CH1 { GPIO_PIN(PORT_B, 4), GPIO_PIN(PORT_H, 6) }
#elif defined(CPU_ATMEGA1281)
#define PWM_PINS_CH0 { GPIO_PIN(PORT_B, 7), GPIO_PIN(PORT_G, 5) }
#define PWM_PINS_CH1 { GPIO_PIN(PORT_B, 4), GPIO_UNDEF }
#endif
static const pwm_conf_t pwm_conf[] = {
{
.dev = MINI_TIMER0,
.pin_ch = PWM_PINS_CH0,
.div = MINI_TIMER0_DIV,
},
{
.dev = MINI_TIMER2,
.pin_ch = PWM_PINS_CH1,
.div = MINI_TIMER2_DIV,
}
};
#define PWM_NUMOF (sizeof(pwm_conf) / sizeof(pwm_conf[0]))
/** @} */
#ifdef __cplusplus #ifdef __cplusplus
} }
#endif #endif

2
tests/periph_pwm/Makefile
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@ -1,6 +1,8 @@
BOARD ?= samr21-xpro BOARD ?= samr21-xpro
include ../Makefile.tests_common include ../Makefile.tests_common
BOARD_INSUFFICIENT_MEMORY := arduino-duemilanove arduino-uno
FEATURES_REQUIRED = periph_pwm FEATURES_REQUIRED = periph_pwm
USEMODULE += xtimer USEMODULE += xtimer