Diff: nRF51822/nordic/nrf-sdk/nrf_gpio.h

Revision:

1:48f6e08a3ac2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nRF51822/nordic/nrf-sdk/nrf_gpio.h	Wed Aug 20 13:24:20 2014 +0000
@@ -0,0 +1,422 @@
+#ifndef NRF_GPIO_H__
+#define NRF_GPIO_H__
+
+#include "nrf51.h"
+#include "nrf51_bitfields.h"
+
+/**
+ * @defgroup nrf_gpio GPIO abstraction
+ * @{
+ * @ingroup nrf_drivers
+ * @brief GPIO pin abstraction and port abstraction for reading and writing byte-wise to GPIO ports.
+ *
+ * Here, the GPIO ports are defined as follows:
+ * - Port 0 -> pin 0-7
+ * - Port 1 -> pin 8-15
+ * - Port 2 -> pin 16-23
+ * - Port 3 -> pin 24-31
+ */
+
+/**
+ * @enum nrf_gpio_port_dir_t
+ * @brief Enumerator used for setting the direction of a GPIO port.
+ */
+typedef enum
+{
+    NRF_GPIO_PORT_DIR_OUTPUT,       ///<  Output
+    NRF_GPIO_PORT_DIR_INPUT         ///<  Input
+} nrf_gpio_port_dir_t;
+
+/**
+ * @enum nrf_gpio_pin_dir_t
+ * Pin direction definitions.
+ */
+typedef enum
+{
+    NRF_GPIO_PIN_DIR_INPUT,   ///< Input
+    NRF_GPIO_PIN_DIR_OUTPUT   ///< Output
+} nrf_gpio_pin_dir_t;
+
+/**
+ * @enum nrf_gpio_port_select_t
+ * @brief Enumerator used for selecting between port 0 - 3.
+ */
+typedef enum
+{
+    NRF_GPIO_PORT_SELECT_PORT0 = 0,           ///<  Port 0 (GPIO pin 0-7)
+    NRF_GPIO_PORT_SELECT_PORT1,               ///<  Port 1 (GPIO pin 8-15)
+    NRF_GPIO_PORT_SELECT_PORT2,               ///<  Port 2 (GPIO pin 16-23)
+    NRF_GPIO_PORT_SELECT_PORT3,               ///<  Port 3 (GPIO pin 24-31)
+} nrf_gpio_port_select_t;
+
+/**
+ * @enum nrf_gpio_pin_pull_t
+ * @brief Enumerator used for selecting the pin to be pulled down or up at the time of pin configuration
+ */
+typedef enum
+{
+    NRF_GPIO_PIN_NOPULL   = GPIO_PIN_CNF_PULL_Disabled,                 ///<  Pin pullup resistor disabled
+    NRF_GPIO_PIN_PULLDOWN = GPIO_PIN_CNF_PULL_Pulldown,                 ///<  Pin pulldown resistor enabled
+    NRF_GPIO_PIN_PULLUP   = GPIO_PIN_CNF_PULL_Pullup,                   ///<  Pin pullup resistor enabled
+} nrf_gpio_pin_pull_t;
+
+/**
+ * @enum nrf_gpio_pin_sense_t
+ * @brief Enumerator used for selecting the pin to sense high or low level on the pin input.
+ */
+typedef enum
+{
+    NRF_GPIO_PIN_NOSENSE    = GPIO_PIN_CNF_SENSE_Disabled,              ///<  Pin sense level disabled.
+    NRF_GPIO_PIN_SENSE_LOW  = GPIO_PIN_CNF_SENSE_Low,                   ///<  Pin sense low level.
+    NRF_GPIO_PIN_SENSE_HIGH = GPIO_PIN_CNF_SENSE_High,                  ///<  Pin sense high level.
+} nrf_gpio_pin_sense_t;
+
+/**
+ * @brief Function for configuring the GPIO pin range as outputs with normal drive strength.
+ *        This function can be used to configure pin range as simple output with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases).
+ *
+ * @param pin_range_start specifies the start number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
+ *
+ * @param pin_range_end specifies the end number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
+ *
+ * @note For configuring only one pin as output use @ref nrf_gpio_cfg_output
+ *       Sense capability on the pin is disabled, and input is disconnected from the buffer as the pins are configured as output.
+ */
+static __INLINE void nrf_gpio_range_cfg_output(uint32_t pin_range_start, uint32_t pin_range_end)
+{
+    /*lint -e{845} // A zero has been given as right argument to operator '|'" */
+    for (; pin_range_start <= pin_range_end; pin_range_start++)
+    {
+        NRF_GPIO->PIN_CNF[pin_range_start] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                                        | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
+                                        | (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
+                                        | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+    }
+}
+
+/**
+ * @brief Function for configuring the GPIO pin range as inputs with given initial value set, hiding inner details.
+ *        This function can be used to configure pin range as simple input.
+ *
+ * @param pin_range_start specifies the start number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
+ *
+ * @param pin_range_end specifies the end number (inclusive) in the range of pin numbers to be configured (allowed values 0-30)
+ *
+ * @param pull_config State of the pin range pull resistor (no pull, pulled down or pulled high)
+ *
+ * @note  For configuring only one pin as input use @ref nrf_gpio_cfg_input
+ *        Sense capability on the pin is disabled, and input is connected to buffer so that the GPIO->IN register is readable
+ */
+static __INLINE void nrf_gpio_range_cfg_input(uint32_t pin_range_start, uint32_t pin_range_end, nrf_gpio_pin_pull_t pull_config)
+{
+    /*lint -e{845} // A zero has been given as right argument to operator '|'" */
+    for (; pin_range_start <= pin_range_end; pin_range_start++)
+    {
+        NRF_GPIO->PIN_CNF[pin_range_start] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                                        | (pull_config << GPIO_PIN_CNF_PULL_Pos)
+                                        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
+                                        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
+    }
+}
+
+/**
+ * @brief Function for configuring the given GPIO pin number as output with given initial value set, hiding inner details.
+ *        This function can be used to configure pin range as simple input with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases).
+ *
+ * @param pin_number specifies the pin number of gpio pin numbers to be configured (allowed values 0-30)
+ *
+ * @note  Sense capability on the pin is disabled, and input is disconnected from the buffer as the pins are configured as output.
+ */
+static __INLINE void nrf_gpio_cfg_output(uint32_t pin_number)
+{
+    /*lint -e{845} // A zero has been given as right argument to operator '|'" */
+    NRF_GPIO->PIN_CNF[pin_number] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+                                            | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                                            | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
+                                            | (GPIO_PIN_CNF_INPUT_Disconnect << GPIO_PIN_CNF_INPUT_Pos)
+                                            | (GPIO_PIN_CNF_DIR_Output << GPIO_PIN_CNF_DIR_Pos);
+}
+
+/**
+ * @brief Function for configuring the given GPIO pin number as input with given initial value set, hiding inner details.
+ *        This function can be used to configure pin range as simple input with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases).
+ *
+ * @param pin_number specifies the pin number of gpio pin numbers to be configured (allowed values 0-30)
+ *
+ * @param pull_config State of the pin range pull resistor (no pull, pulled down or pulled high)
+ *
+ * @note  Sense capability on the pin is disabled, and input is connected to buffer so that the GPIO->IN register is readable
+ */
+static __INLINE void nrf_gpio_cfg_input(uint32_t pin_number, nrf_gpio_pin_pull_t pull_config)
+{
+    /*lint -e{845} // A zero has been given as right argument to operator '|'" */
+    NRF_GPIO->PIN_CNF[pin_number] = (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                                        | (pull_config << GPIO_PIN_CNF_PULL_Pos)
+                                        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
+                                        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
+}
+
+/**
+ * @brief Function for configuring the given GPIO pin number as input with given initial value set, hiding inner details.
+ *        This function can be used to configure pin range as simple input with gate driving GPIO_PIN_CNF_DRIVE_S0S1 (normal cases).
+ *        Sense capability on the pin is configurable, and input is connected to buffer so that the GPIO->IN register is readable.
+ *
+ * @param pin_number specifies the pin number of gpio pin numbers to be configured (allowed values 0-30).
+ *
+ * @param pull_config state of the pin pull resistor (no pull, pulled down or pulled high).
+ *
+ * @param sense_config sense level of the pin (no sense, sense low or sense high).
+ */
+static __INLINE void nrf_gpio_cfg_sense_input(uint32_t pin_number, nrf_gpio_pin_pull_t pull_config, nrf_gpio_pin_sense_t sense_config)
+{
+    /*lint -e{845} // A zero has been given as right argument to operator '|'" */
+    NRF_GPIO->PIN_CNF[pin_number] = (sense_config << GPIO_PIN_CNF_SENSE_Pos)
+                                        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+                                        | (pull_config << GPIO_PIN_CNF_PULL_Pos)
+                                        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
+                                        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
+}
+
+/**
+ * @brief Function for setting the direction for a GPIO pin.
+ *
+ * @param pin_number specifies the pin number [0:31] for which to
+ * set the direction.
+ *
+ * @param direction specifies the direction
+ */
+static __INLINE void nrf_gpio_pin_dir_set(uint32_t pin_number, nrf_gpio_pin_dir_t direction)
+{
+    if(direction == NRF_GPIO_PIN_DIR_INPUT)
+    {
+        NRF_GPIO->PIN_CNF[pin_number] =
+          (GPIO_PIN_CNF_SENSE_Disabled << GPIO_PIN_CNF_SENSE_Pos)
+        | (GPIO_PIN_CNF_DRIVE_S0S1 << GPIO_PIN_CNF_DRIVE_Pos)
+        | (GPIO_PIN_CNF_PULL_Disabled << GPIO_PIN_CNF_PULL_Pos)
+        | (GPIO_PIN_CNF_INPUT_Connect << GPIO_PIN_CNF_INPUT_Pos)
+        | (GPIO_PIN_CNF_DIR_Input << GPIO_PIN_CNF_DIR_Pos);
+    }
+    else
+    {
+        NRF_GPIO->DIRSET = (1UL << pin_number);
+    }
+}
+
+/**
+ * @brief Function for setting a GPIO pin.
+ *
+ * Note that the pin must be configured as an output for this
+ * function to have any effect.
+ *
+ * @param pin_number specifies the pin number [0:31] to
+ * set.
+ */
+static __INLINE void nrf_gpio_pin_set(uint32_t pin_number)
+{
+    NRF_GPIO->OUTSET = (1UL << pin_number);
+}
+
+/**
+ * @brief Function for clearing a GPIO pin.
+ *
+ * Note that the pin must be configured as an output for this
+ * function to have any effect.
+ *
+ * @param pin_number specifies the pin number [0:31] to
+ * clear.
+ */
+static __INLINE void nrf_gpio_pin_clear(uint32_t pin_number)
+{
+    NRF_GPIO->OUTCLR = (1UL << pin_number);
+}
+
+/**
+ * @brief Function for toggling a GPIO pin.
+ *
+ * Note that the pin must be configured as an output for this
+ * function to have any effect.
+ *
+ * @param pin_number specifies the pin number [0:31] to
+ * toggle.
+ */
+static __INLINE void nrf_gpio_pin_toggle(uint32_t pin_number)
+{
+    const uint32_t pin_bit   = 1UL << pin_number;
+    const uint32_t pin_state = ((NRF_GPIO->OUT >> pin_number) & 1UL);
+    
+    if (pin_state == 0)
+    {
+        // Current state low, set high.
+        NRF_GPIO->OUTSET = pin_bit;        
+    }
+    else
+    {
+        // Current state high, set low.    
+        NRF_GPIO->OUTCLR = pin_bit;       
+    }
+}
+
+/**
+ * @brief Function for writing a value to a GPIO pin.
+ *
+ * Note that the pin must be configured as an output for this
+ * function to have any effect.
+ *
+ * @param pin_number specifies the pin number [0:31] to
+ * write.
+ *
+ * @param value specifies the value to be written to the pin.
+ * @arg 0 clears the pin
+ * @arg >=1 sets the pin.
+ */
+static __INLINE void nrf_gpio_pin_write(uint32_t pin_number, uint32_t value)
+{
+    if (value == 0)
+    {
+        nrf_gpio_pin_clear(pin_number);
+    }
+    else
+    {
+        nrf_gpio_pin_set(pin_number);
+    }
+}
+
+/**
+ * @brief Function for reading the input level of a GPIO pin.
+ *
+ * Note that the pin must have input connected for the value
+ * returned from this function to be valid.
+ *
+ * @param pin_number specifies the pin number [0:31] to
+ * read.
+ *
+ * @return
+ * @retval 0 if the pin input level is low.
+ * @retval 1 if the pin input level is high.
+ * @retval > 1 should never occur.
+ */
+static __INLINE uint32_t nrf_gpio_pin_read(uint32_t pin_number)
+{
+    return  ((NRF_GPIO->IN >> pin_number) & 1UL);
+}
+
+/**
+ * @brief Generic function for writing a single byte of a 32 bit word at a given
+ * address.
+ *
+ * This function should not be called from outside the nrf_gpio
+ * abstraction layer.
+ *
+ * @param word_address is the address of the word to be written.
+ *
+ * @param byte_no is the the word byte number (0-3) to be written.
+ *
+ * @param value is the value to be written to byte "byte_no" of word
+ * at address "word_address"
+ */
+static __INLINE void nrf_gpio_word_byte_write(volatile uint32_t * word_address, uint8_t byte_no, uint8_t value)
+{
+    *((volatile uint8_t*)(word_address) + byte_no) = value;
+}
+
+/**
+ * @brief Generic function for reading a single byte of a 32 bit word at a given
+ * address.
+ *
+ * This function should not be called from outside the nrf_gpio
+ * abstraction layer.
+ *
+ * @param word_address is the address of the word to be read.
+ *
+ * @param byte_no is the the byte number (0-3) of the word to be read.
+ *
+ * @return byte "byte_no" of word at address "word_address".
+ */
+static __INLINE uint8_t nrf_gpio_word_byte_read(const volatile uint32_t* word_address, uint8_t byte_no)
+{
+    return (*((const volatile uint8_t*)(word_address) + byte_no));
+}
+
+/**
+ * @brief Function for setting the direction of a port.
+ *
+ * @param port is the port for which to set the direction.
+ *
+ * @param dir direction to be set for this port.
+ */
+static __INLINE void nrf_gpio_port_dir_set(nrf_gpio_port_select_t port, nrf_gpio_port_dir_t dir)
+{
+    if (dir == NRF_GPIO_PORT_DIR_OUTPUT)
+    {
+        nrf_gpio_word_byte_write(&NRF_GPIO->DIRSET, port, 0xFF);
+    }
+    else
+    {
+        nrf_gpio_range_cfg_input(port*8, (port+1)*8-1, NRF_GPIO_PIN_NOPULL);
+    }
+}
+
+/**
+ * @brief Function for reading a GPIO port.
+ *
+ * @param port is the port to read.
+ *
+ * @return the input value on this port.
+ */
+static __INLINE uint8_t nrf_gpio_port_read(nrf_gpio_port_select_t port)
+{
+    return nrf_gpio_word_byte_read(&NRF_GPIO->IN, port);
+}
+
+/**
+ * @brief Function for writing to a GPIO port.
+ *
+ * @param port is the port to write.
+ *
+ * @param value is the value to write to this port.
+ *
+ * @sa nrf_gpio_port_dir_set()
+ */
+static __INLINE void nrf_gpio_port_write(nrf_gpio_port_select_t port, uint8_t value)
+{
+    nrf_gpio_word_byte_write(&NRF_GPIO->OUT, port, value);
+}
+
+/**
+ * @brief Function for setting individual pins on GPIO port.
+ *
+ * @param port is the port for which to set the pins.
+ *
+ * @param set_mask is a mask specifying which pins to set. A bit
+ * set to 1 indicates that the corresponding port pin shall be
+ * set.
+ *
+ * @sa nrf_gpio_port_dir_set()
+ */
+static __INLINE void nrf_gpio_port_set(nrf_gpio_port_select_t port, uint8_t set_mask)
+{
+    nrf_gpio_word_byte_write(&NRF_GPIO->OUTSET, port, set_mask);
+}
+
+/**
+ * @brief Function for clearing individual pins on GPIO port.
+ *
+ * @param port is the port for which to clear the pins.
+ *
+ * @param clr_mask is a mask specifying which pins to clear. A bit
+ * set to 1 indicates that the corresponding port pin shall be
+ * cleared.
+ *
+ * @sa nrf_gpio_port_dir_set()
+ */
+static __INLINE void nrf_gpio_port_clear(nrf_gpio_port_select_t port, uint8_t clr_mask)
+{
+    nrf_gpio_word_byte_write(&NRF_GPIO->OUTCLR, port, clr_mask);
+}
+
+/** @} */
+
+#endif