From d05151fdef59ff586350ccd0b0f24e06d3709db3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ren=C3=A9=20Herthel?= <rene.herthel@haw-hamburg.de>
Date: Mon, 13 Apr 2015 14:25:42 +0200
Subject: [PATCH] cpu/mega2560: initial import of a gpio driver
---
boards/arduino-mega2560/Makefile.features | 1 +
boards/arduino-mega2560/include/periph_conf.h | 26 --
cpu/atmega2560/include/periph_cpu.h | 27 +-
cpu/atmega2560/periph/Makefile | 1 +
cpu/atmega2560/periph/gpio.c | 259 ++++++++++++++++++
5 files changed, 285 insertions(+), 29 deletions(-)
create mode 100644 cpu/atmega2560/periph/gpio.c
diff --git a/boards/arduino-mega2560/Makefile.features b/boards/arduino-mega2560/Makefile.features
index 675243084d..098dfa3e53 100644
--- a/boards/arduino-mega2560/Makefile.features
+++ b/boards/arduino-mega2560/Makefile.features
@@ -1,2 +1,3 @@
FEATURES_PROVIDED += periph_uart
+FEATURES_PROVIDED += periph_gpio
FEATURES_MCU_GROUP = avr8
diff --git a/boards/arduino-mega2560/include/periph_conf.h b/boards/arduino-mega2560/include/periph_conf.h
index 22549013bc..19f1d3dc1f 100644
--- a/boards/arduino-mega2560/include/periph_conf.h
+++ b/boards/arduino-mega2560/include/periph_conf.h
@@ -227,12 +227,6 @@ extern "C" {
#define UART3_RECEIVED_DATA (UART3_CTRL_STAT_A & (1 << UART3_RX_COMPLETE))
#define UART3_DTREG_EMPTY (UART3_CTRL_STAT_A & (1 << UART3_DATA_EMPTY))
-
-
-/* TODO: add defines for device agnostic implementation */
-/** @} */
-
-
/**
* @brief ADC configuration
*/
@@ -261,26 +255,6 @@ extern "C" {
#define I2C_0_EN 0
#define I2C_0_EN 0
-/**
- * @brief GPIO configuration
- */
-#define GPIO_0_EN 0
-#define GPIO_1_EN 0
-#define GPIO_2_EN 0
-#define GPIO_3_EN 0
-#define GPIO_4_EN 0
-#define GPIO_5_EN 0
-#define GPIO_6_EN 0
-#define GPIO_7_EN 0
-#define GPIO_8_EN 0
-#define GPIO_9_EN 0
-#define GPIO_10_EN 0
-#define GPIO_11_EN 0
-#define GPIO_12_EN 0
-#define GPIO_13_EN 0
-#define GPIO_14_EN 0
-#define GPIO_15_EN 0
-
#ifdef __cplusplus
}
#endif
diff --git a/cpu/atmega2560/include/periph_cpu.h b/cpu/atmega2560/include/periph_cpu.h
index f4b1548294..7d38894e90 100644
--- a/cpu/atmega2560/include/periph_cpu.h
+++ b/cpu/atmega2560/include/periph_cpu.h
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2015 Freie Universität Berlin
+ * Copyright (C) 2015 HAW Hamburg
*
* 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
@@ -13,19 +13,40 @@
* @file
* @brief CPU specific definitions for internal peripheral handling
*
- * @author Hauke Petersen <hauke.peterse@fu-berlin.de>
+ * @author René Herthel <rene-herthel@outlook.de>
*/
#ifndef PERIPH_CPU_H_
#define PERIPH_CPU_H_
#include "periph/dev_enums.h"
+#include <avr/io.h>
#ifdef __cplusplus
extern "C" {
#endif
-/* nothing defined here so far... */
+/**
+ * @brief Define a CPU specific GPIO pin generator macro
+ */
+#define GPIO(x, y) ((x << 4) | y)
+
+/**
+ * @brief Available ports on the ATmega2560 family
+ */
+enum {
+ PORT_A = 0, /**< port A */
+ PORT_B = 1, /**< port B */
+ PORT_C = 2, /**< port C */
+ PORT_D = 3, /**< port D */
+ PORT_E = 4, /**< port E */
+ PORT_F = 5, /**< port F */
+ PORT_G = 6, /**< port G */
+ PORT_H = 7, /**< port H */
+ PORT_J = 8, /**< port J */
+ PORT_K = 9, /**< port K */
+ PORT_L = 10 /**< port L */
+};
#ifdef __cplusplus
}
diff --git a/cpu/atmega2560/periph/Makefile b/cpu/atmega2560/periph/Makefile
index 87a55ed684..6d1887b640 100644
--- a/cpu/atmega2560/periph/Makefile
+++ b/cpu/atmega2560/periph/Makefile
@@ -1,2 +1,3 @@
MODULE = periph
+
include $(RIOTBASE)/Makefile.base
diff --git a/cpu/atmega2560/periph/gpio.c b/cpu/atmega2560/periph/gpio.c
new file mode 100644
index 0000000000..275e1dc7eb
--- /dev/null
+++ b/cpu/atmega2560/periph/gpio.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (C) 2015 HAW Hamburg
+
+ *
+ * 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 driver_periph
+ * @{
+ *
+ * @file
+ * @brief Low-level GPIO driver implementation for ATmega2560
+ *
+ * @author René Herthel <rene-herthel@outlook.de>
+ *
+ * @}
+ */
+
+
+#include <stdio.h>
+
+#include <avr/interrupt.h>
+
+#include "cpu.h"
+#include "periph/gpio.h"
+#include "periph_conf.h"
+
+#define GPIO_BASE_PORT_A (0x20)
+#define GPIO_OFFSET_PORT_H (0xCB)
+#define GPIO_OFFSET_PIN_PORT (0x02)
+#define GPIO_OFFSET_PIN_PIN (0x03)
+#define GPIO_EXT_INT_NUMOF (7U)
+
+typedef struct {
+ gpio_cb_t cb;
+ void *arg;
+} gpio_state_t;
+
+static gpio_state_t config[GPIO_EXT_INT_NUMOF];
+
+/**
+ * @brief Extract the pin number of the given pin
+ */
+static inline uint8_t _pin_num(gpio_t pin)
+{
+ return (pin & 0x0f);
+}
+
+/**
+ * @brief Extract the port number of the given pin
+ */
+static inline uint8_t _port_num(gpio_t pin)
+{
+ return (pin >> 4) & 0x0f;
+}
+
+/**
+ * @brief Generate the PORTx address of the give pin.
+ */
+static inline uint16_t _port_addr(gpio_t pin)
+{
+ uint8_t port_num = _port_num(pin);
+ uint16_t port_addr = port_num * GPIO_OFFSET_PIN_PIN;
+
+ port_addr += GPIO_BASE_PORT_A;
+ port_addr += GPIO_OFFSET_PIN_PORT;
+
+ if (port_num > PORT_G) {
+ port_addr += GPIO_OFFSET_PORT_H;
+ }
+
+ return port_addr;
+}
+
+/**
+ * @brief Generate the DDRx address of the given pin
+ */
+static inline uint8_t _ddr_addr(gpio_t pin)
+{
+ return (_port_addr(pin) - 0x01);
+}
+
+/**
+ * @brief Generate the PINx address of the given pin.
+ */
+static inline uint8_t _pin_addr(gpio_t pin)
+{
+ return (_port_addr(pin) - 0x02);
+}
+
+int gpio_init(gpio_t pin, gpio_dir_t dir, gpio_pp_t pullup)
+{
+ int res;
+
+ if (dir == GPIO_DIR_OUT) {
+ _SFR_MEM8(_ddr_addr(pin)) |= (1 << _pin_num(pin));
+ res = bit_is_set(_SFR_MEM8(_ddr_addr(pin)), _pin_num(pin));
+ }
+ else {
+ _SFR_MEM8(_ddr_addr(pin)) &= ~(1 << _pin_num(pin));
+ res = bit_is_clear(_SFR_MEM8(_ddr_addr(pin)), _pin_num(pin));
+ }
+
+ return (res == 0) ? -1 : 0;
+}
+
+int gpio_init_int(gpio_t pin, gpio_pp_t pullup, gpio_flank_t flank,
+ gpio_cb_t cb, void *arg)
+{
+ uint8_t pin_num = _pin_num(pin);
+
+ if ((_port_num(pin) == PORT_D && pin_num > 3)
+ || (_port_num(pin) == PORT_E && pin_num < 4)) {
+ return -1;
+ }
+
+ if (gpio_init(pin, GPIO_DIR_IN, pullup) < 0) {
+ return -1;
+ }
+
+ gpio_set(pin);
+
+ /* clear global interrupt flag */
+ cli();
+
+ EIMSK |= (1 << pin_num);
+
+ /* configure the flank */
+ switch (flank) {
+ case GPIO_RISING:
+ if (pin_num < 4) {
+ EICRA |= (3 << pin_num * 2);
+ }
+ else {
+ EICRB |= (3 << (pin_num * 2) % 4);
+ }
+ break;
+ case GPIO_FALLING:
+ if (pin_num < 4) {
+ EICRA |= (2 << pin_num * 2);
+ }
+ else {
+ EICRB |= (2 << (pin_num * 2) % 4);
+ }
+ break;
+ case GPIO_BOTH:
+ if (pin_num < 4) {
+ EICRA |= (1 << pin_num * 2);
+ }
+ else {
+ EICRB |= (1 << (pin_num * 2) % 4);
+ }
+ break;
+ default:
+ return -1;
+ };
+
+ /* set callback */
+ config[pin_num].cb = cb;
+ config[pin_num].arg = arg;
+
+ /* set global interrupt flag */
+ sei();
+
+ return 0;
+}
+
+void gpio_irq_enable(gpio_t pin)
+{
+ EIMSK |= (1 << _pin_num(pin));
+}
+
+void gpio_irq_disable(gpio_t pin)
+{
+ EIMSK &= ~(1 << _pin_num(pin));
+}
+
+int gpio_read(gpio_t pin)
+{
+ return (_SFR_MEM8(_pin_addr(pin)) & (1 << _pin_num(pin)));
+}
+
+void gpio_set(gpio_t pin)
+{
+ _SFR_MEM8(_port_addr(pin)) |= (1 << _pin_num(pin));
+}
+
+void gpio_clear(gpio_t pin)
+{
+ _SFR_MEM8(_port_addr(pin)) &= ~(1 << _pin_num(pin));
+}
+
+void gpio_toggle(gpio_t pin)
+{
+ if (gpio_read(pin)) {
+ gpio_clear(pin);
+ }
+ else {
+ gpio_set(pin);
+ }
+}
+
+void gpio_write(gpio_t pin, int value)
+{
+ if (value) {
+ gpio_set(pin);
+ }
+ else {
+ gpio_clear(pin);
+ }
+}
+
+static inline void irq_handler(uint8_t pin_num)
+{
+ config[pin_num].cb(config[pin_num].arg);
+}
+
+ISR(INT0_vect, ISR_BLOCK)
+{
+ irq_handler(0); /**< predefined interrupt pin */
+}
+
+ISR(INT1_vect, ISR_BLOCK)
+{
+ irq_handler(1); /**< predefined interrupt pin */
+}
+
+ISR(INT2_vect, ISR_BLOCK)
+{
+ irq_handler(2); /**< predefined interrupt pin */
+}
+
+ISR(INT3_vect, ISR_BLOCK)
+{
+ irq_handler(3); /**< predefined interrupt pin */
+}
+
+ISR(INT4_vect, ISR_BLOCK)
+{
+ irq_handler(4); /**< predefined interrupt pin */
+}
+
+ISR(INT5_vect, ISR_BLOCK)
+{
+ irq_handler(5); /**< predefined interrupt pin */
+}
+
+ISR(INT6_vect, ISR_BLOCK)
+{
+ irq_handler(6); /**< predefined interrupt pin */
+}
+
+ISR(INT7_vect, ISR_BLOCK)
+{
+ irq_handler(7); /**< predefined interrupt pin */
+}
--
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