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cpu, cc2538: gpio helper functions
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@smlng
smlng committed Jul 6, 2017
1 parent 39c6051 commit 69f1584
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Showing 2 changed files with 126 additions and 64 deletions.
100 changes: 96 additions & 4 deletions cpu/cc2538/include/periph_cpu.h
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Original file line number Diff line number Diff line change
@@ -1,19 +1,21 @@
/*
* Copyright (C) 2015-2016 Freie Universität Berlin
* 2017 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 cpu_cc2538
* @ingroup cpu_cc2538
* @{
*
* @file
* @brief CPU specific definitions for internal peripheral handling
* @brief CPU specific definitions for internal peripheral handling
*
* @author Hauke Petersen <[email protected]>
* @author Hauke Petersen <[email protected]>
* @author Sebastian Meiling <[email protected]>
*/

#ifndef PERIPH_CPU_H
Expand Down Expand Up @@ -44,13 +46,103 @@ extern "C" {
typedef uint32_t gpio_t;
/** @} */

/**
* @name Internal GPIO shift and masking
* @{
*/
#define PORTNUM_MASK (0x00007000) /**< bit mask for GPIO port [0-3] */
#define PORTNUM_SHIFT (12U) /**< bit shift for GPIO port */
#define PIN_MASK (0x00000007) /**< bit mask for GPIO pin [0-7] */
#define GPIO_MASK (0xfffff000) /**< bit mask for GPIO port addr */
/** @} */

/**
* @brief Define a custom GPIO_PIN macro
*
* For the CC2538, we use OR the gpio ports base register address with the
* actual pin number.
*/
#define GPIO_PIN(port, pin) (gpio_t)(((uint32_t)GPIO_A + (port << 12)) | pin)
#define GPIO_PIN(port, pin) (gpio_t)(((uint32_t)GPIO_A + \
(port << PORTNUM_SHIFT)) | pin)

/**
* @brief Access GPIO low-level device
*
* @param[in] pin gpio pin
*
* @return pointer to gpio low level device address
*/
static inline cc2538_gpio_t *gpio(gpio_t pin)
{
return (cc2538_gpio_t *)(pin & GPIO_MASK);
}

/**
* @brief Helper function to get port number for gpio pin
*
* @param[in] pin gpio pin
*
* @return port number of gpio pin, [0=A - 3=D]
*/
static inline int gpio_port_num(gpio_t pin)
{
return (int)((pin & PORTNUM_MASK) >> PORTNUM_SHIFT) - 1;
}

/**
* @brief Helper function to get pin number for gpio pin
*
* @param[in] pin gpio pin
*
* @return pin number of gpio pin, [0 - 7]
*/
static inline int gpio_pin_num(gpio_t pin)
{
return (int)(pin & PIN_MASK);
}
/**
* @brief Helper function to get bit mask for gpio pin number
*
* @param[in] pin gpio pin
*
* @return bit mask for gpio pin number, 2^[0 - 7]
*/
static inline uint32_t gpio_pin_mask(gpio_t pin)
{
return (1 << (pin & PIN_MASK));
}

/**
* @brief Helper function to get CC2538 gpio number from port and pin
*
* @param[in] pin gpio pin
*
* @return number of gpio pin, [0 - 31]
*/
static inline int gpio_pp_num(gpio_t pin)
{
return (gpio_port_num(pin) * 8) + gpio_pin_num(pin);
}

/**
* @brief Helper function to enable gpio hardware control
*
* @param[in] pin gpio pin
*/
static inline void gpio_hw_ctrl(gpio_t pin)
{
gpio(pin)->AFSEL |= gpio_pin_mask(pin);
}

/**
* @brief Helper function to enable gpio software control
*
* @param[in] pin gpio pin
*/
static inline void gpio_sw_ctrl(gpio_t pin)
{
gpio(pin)->AFSEL &= ~gpio_pin_mask(pin);
}

/**
* @brief Define a custom GPIO_UNDEF value
Expand Down
90 changes: 30 additions & 60 deletions cpu/cc2538/periph/gpio.c
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Original file line number Diff line number Diff line change
Expand Up @@ -17,7 +17,7 @@
*
* @author Ian Martin <[email protected]>
* @author Hauke Petersen <[email protected]>
*
* @author Sebastian Meiling <[email protected]>
* @}
*/

Expand All @@ -26,37 +26,8 @@
#include "cpu.h"
#include "periph/gpio.h"

#define GPIO_MASK (0xfffff000)
#define PORTNUM_MASK (0x00007000)
#define PORTNUM_SHIFT (12U)
#define PIN_MASK (0x00000007)
#define MODE_NOTSUP (0xff)

static inline cc2538_gpio_t *gpio(gpio_t pin)
{
return (cc2538_gpio_t *)(pin & GPIO_MASK);
}

static inline int port_num(gpio_t pin)
{
return (int)((pin & PORTNUM_MASK) >> PORTNUM_SHIFT) - 1;
}

static inline int pin_num(gpio_t pin)
{
return (int)(pin & PIN_MASK);
}

static inline uint32_t pin_mask(gpio_t pin)
{
return (1 << (pin & PIN_MASK));
}

static inline int pp_num(gpio_t pin)
{
return (port_num(pin) * 8) + pin_num(pin);
}

static gpio_isr_ctx_t isr_ctx[4][8];

int gpio_init(gpio_t pin, gpio_mode_t mode)
Expand All @@ -66,22 +37,21 @@ int gpio_init(gpio_t pin, gpio_mode_t mode)
return -1;
}


/* disable any alternate function and any eventual interrupts */
gpio(pin)->IE &= ~pin_mask(pin);
gpio(pin)->AFSEL &= ~pin_mask(pin);
gpio(pin)->IE &= ~gpio_pin_mask(pin);
gpio(pin)->AFSEL &= ~gpio_pin_mask(pin);
/* configure pull configuration */
IOC->OVER[pp_num(pin)] = mode;
IOC->OVER[gpio_pp_num(pin)] = mode;

/* set pin direction */
if (mode == IOC_OVERRIDE_OE) {
gpio(pin)->DIR |= pin_mask(pin);
gpio(pin)->DIR |= gpio_pin_mask(pin);
}
else {
gpio(pin)->DIR &= ~pin_mask(pin);
gpio(pin)->DIR &= ~gpio_pin_mask(pin);
}
/* clear pin */
gpio(pin)->DATA &= ~pin_mask(pin);
gpio(pin)->DATA &= ~gpio_pin_mask(pin);

return 0;
}
Expand All @@ -94,80 +64,80 @@ int gpio_init_int(gpio_t pin, gpio_mode_t mode, gpio_flank_t flank,
}

/* store the callback information for later: */
isr_ctx[port_num(pin)][pin_num(pin)].cb = cb;
isr_ctx[port_num(pin)][pin_num(pin)].arg = arg;
isr_ctx[gpio_port_num(pin)][gpio_pin_num(pin)].cb = cb;
isr_ctx[gpio_port_num(pin)][gpio_pin_num(pin)].arg = arg;

/* enable power-up interrupts for this GPIO port: */
SYS_CTRL->IWE |= (1 << port_num(pin));
SYS_CTRL->IWE |= (1 << gpio_port_num(pin));

/* configure the active flank(s) */
gpio(pin)->IS &= ~pin_mask(pin);
gpio(pin)->IS &= ~gpio_pin_mask(pin);
switch(flank) {
case GPIO_FALLING:
gpio(pin)->IBE &= ~pin_mask(pin);
gpio(pin)->IEV &= ~pin_mask(pin);
gpio(pin)->P_EDGE_CTRL |= (1 << pp_num(pin));
gpio(pin)->IBE &= ~gpio_pin_mask(pin);
gpio(pin)->IEV &= ~gpio_pin_mask(pin);
gpio(pin)->P_EDGE_CTRL |= (1 << gpio_pp_num(pin));
break;
case GPIO_RISING:
gpio(pin)->IBE &= ~pin_mask(pin);
gpio(pin)->IEV |= pin_mask(pin);
gpio(pin)->P_EDGE_CTRL &= ~(1 << pp_num(pin));
gpio(pin)->IBE &= ~gpio_pin_mask(pin);
gpio(pin)->IEV |= gpio_pin_mask(pin);
gpio(pin)->P_EDGE_CTRL &= ~(1 << gpio_pp_num(pin));
break;
case GPIO_BOTH:
gpio(pin)->IBE |= pin_mask(pin);
gpio(pin)->IBE |= gpio_pin_mask(pin);
break;
default:
return -1;
}

/* reset interrupt status */
gpio(pin)->IC = pin_mask(pin);
gpio(pin)->PI_IEN |= (1 << pp_num(pin));
gpio(pin)->IC = gpio_pin_mask(pin);
gpio(pin)->PI_IEN |= (1 << gpio_pp_num(pin));
/* enable global interrupt for the selected GPIO port */
NVIC_EnableIRQ(GPIO_PORT_A_IRQn + port_num(pin));
NVIC_EnableIRQ(GPIO_PORT_A_IRQn + gpio_port_num(pin));
/* unmask pin interrupt */
gpio(pin)->IE |= pin_mask(pin);
gpio(pin)->IE |= gpio_pin_mask(pin);

return 0;
}

void gpio_irq_enable(gpio_t pin)
{
gpio(pin)->IE |= pin_mask(pin);
gpio(pin)->IE |= gpio_pin_mask(pin);
}

void gpio_irq_disable(gpio_t pin)
{
gpio(pin)->IE &= ~pin_mask(pin);
gpio(pin)->IE &= ~gpio_pin_mask(pin);
}

int gpio_read(gpio_t pin)
{
return (int)(gpio(pin)->DATA & pin_mask(pin));
return (int)(gpio(pin)->DATA & gpio_pin_mask(pin));
}

void gpio_set(gpio_t pin)
{
gpio(pin)->DATA |= pin_mask(pin);
gpio(pin)->DATA |= gpio_pin_mask(pin);
}

void gpio_clear(gpio_t pin)
{
gpio(pin)->DATA &= ~pin_mask(pin);
gpio(pin)->DATA &= ~gpio_pin_mask(pin);
}

void gpio_toggle(gpio_t pin)
{
gpio(pin)->DATA ^= pin_mask(pin);
gpio(pin)->DATA ^= gpio_pin_mask(pin);
}

void gpio_write(gpio_t pin, int value)
{
if (value) {
gpio(pin)->DATA |= pin_mask(pin);
gpio(pin)->DATA |= gpio_pin_mask(pin);
}
else {
gpio(pin)->DATA &= ~pin_mask(pin);
gpio(pin)->DATA &= ~gpio_pin_mask(pin);
}
}

Expand Down

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