Johannes Stratmann / mbed-dev

added prescaler for 16 bit pwm in LPC1347 target

Fork of mbed-dev by mbed official

targets/hal/TARGET_Silicon_Labs/TARGET_EFM32/emlib/src/em_gpio.c@0:9b334a45a8ff, 2015-10-01 (annotated)

Committer:
bogdanm
Date:
Thu Oct 01 15:25:22 2015 +0300
Revision:
0:9b334a45a8ff
Child:
50:a417edff4437
Initial commit on mbed-dev



Replaces mbed-src (now inactive)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 0:9b334a45a8ff 1 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 2 * @file em_gpio.c
bogdanm 0:9b334a45a8ff 3 * @brief General Purpose IO (GPIO) peripheral API
bogdanm 0:9b334a45a8ff 4 * devices.
bogdanm 0:9b334a45a8ff 5 * @version 3.20.12
bogdanm 0:9b334a45a8ff 6 *******************************************************************************
bogdanm 0:9b334a45a8ff 7 * @section License
bogdanm 0:9b334a45a8ff 8 * <b>(C) Copyright 2014 Silicon Labs, http://www.silabs.com</b>
bogdanm 0:9b334a45a8ff 9 *******************************************************************************
bogdanm 0:9b334a45a8ff 10 *
bogdanm 0:9b334a45a8ff 11 * Permission is granted to anyone to use this software for any purpose,
bogdanm 0:9b334a45a8ff 12 * including commercial applications, and to alter it and redistribute it
bogdanm 0:9b334a45a8ff 13 * freely, subject to the following restrictions:
bogdanm 0:9b334a45a8ff 14 *
bogdanm 0:9b334a45a8ff 15 * 1. The origin of this software must not be misrepresented; you must not
bogdanm 0:9b334a45a8ff 16 * claim that you wrote the original software.
bogdanm 0:9b334a45a8ff 17 * 2. Altered source versions must be plainly marked as such, and must not be
bogdanm 0:9b334a45a8ff 18 * misrepresented as being the original software.
bogdanm 0:9b334a45a8ff 19 * 3. This notice may not be removed or altered from any source distribution.
bogdanm 0:9b334a45a8ff 20 *
bogdanm 0:9b334a45a8ff 21 * DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
bogdanm 0:9b334a45a8ff 22 * obligation to support this Software. Silicon Labs is providing the
bogdanm 0:9b334a45a8ff 23 * Software "AS IS", with no express or implied warranties of any kind,
bogdanm 0:9b334a45a8ff 24 * including, but not limited to, any implied warranties of merchantability
bogdanm 0:9b334a45a8ff 25 * or fitness for any particular purpose or warranties against infringement
bogdanm 0:9b334a45a8ff 26 * of any proprietary rights of a third party.
bogdanm 0:9b334a45a8ff 27 *
bogdanm 0:9b334a45a8ff 28 * Silicon Labs will not be liable for any consequential, incidental, or
bogdanm 0:9b334a45a8ff 29 * special damages, or any other relief, or for any claim by any third party,
bogdanm 0:9b334a45a8ff 30 * arising from your use of this Software.
bogdanm 0:9b334a45a8ff 31 *
bogdanm 0:9b334a45a8ff 32 ******************************************************************************/
bogdanm 0:9b334a45a8ff 33
bogdanm 0:9b334a45a8ff 34
bogdanm 0:9b334a45a8ff 35 #include "em_gpio.h"
bogdanm 0:9b334a45a8ff 36
bogdanm 0:9b334a45a8ff 37 #if defined(GPIO_COUNT) && (GPIO_COUNT > 0)
bogdanm 0:9b334a45a8ff 38 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 39 * @addtogroup EM_Library
bogdanm 0:9b334a45a8ff 40 * @{
bogdanm 0:9b334a45a8ff 41 ******************************************************************************/
bogdanm 0:9b334a45a8ff 42
bogdanm 0:9b334a45a8ff 43 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 44 * @addtogroup GPIO
bogdanm 0:9b334a45a8ff 45 * @brief General Purpose Input/Output (GPIO) API
bogdanm 0:9b334a45a8ff 46 * @{
bogdanm 0:9b334a45a8ff 47 ******************************************************************************/
bogdanm 0:9b334a45a8ff 48
bogdanm 0:9b334a45a8ff 49 /*******************************************************************************
bogdanm 0:9b334a45a8ff 50 ******************************* DEFINES ***********************************
bogdanm 0:9b334a45a8ff 51 ******************************************************************************/
bogdanm 0:9b334a45a8ff 52
bogdanm 0:9b334a45a8ff 53 /** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
bogdanm 0:9b334a45a8ff 54
bogdanm 0:9b334a45a8ff 55 /** Validation of pin typically usable in assert statements. */
bogdanm 0:9b334a45a8ff 56 #define GPIO_DRIVEMODE_VALID(mode) ((mode) <= 3)
bogdanm 0:9b334a45a8ff 57
bogdanm 0:9b334a45a8ff 58 /** @endcond */
bogdanm 0:9b334a45a8ff 59
bogdanm 0:9b334a45a8ff 60
bogdanm 0:9b334a45a8ff 61 /*******************************************************************************
bogdanm 0:9b334a45a8ff 62 ************************** GLOBAL FUNCTIONS *******************************
bogdanm 0:9b334a45a8ff 63 ******************************************************************************/
bogdanm 0:9b334a45a8ff 64
bogdanm 0:9b334a45a8ff 65 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 66 * @brief
bogdanm 0:9b334a45a8ff 67 * Sets the pin location of the debug pins (Serial Wire interface).
bogdanm 0:9b334a45a8ff 68 *
bogdanm 0:9b334a45a8ff 69 * @note
bogdanm 0:9b334a45a8ff 70 * Changing the pins used for debugging uncontrolled, may result in a lockout.
bogdanm 0:9b334a45a8ff 71 *
bogdanm 0:9b334a45a8ff 72 * @param[in] location
bogdanm 0:9b334a45a8ff 73 * The debug pin location to use (0-3).
bogdanm 0:9b334a45a8ff 74 ******************************************************************************/
bogdanm 0:9b334a45a8ff 75 void GPIO_DbgLocationSet(unsigned int location)
bogdanm 0:9b334a45a8ff 76 {
bogdanm 0:9b334a45a8ff 77 #if defined ( _GPIO_ROUTE_SWLOCATION_MASK )
bogdanm 0:9b334a45a8ff 78 EFM_ASSERT(location < AFCHANLOC_MAX);
bogdanm 0:9b334a45a8ff 79
bogdanm 0:9b334a45a8ff 80 GPIO->ROUTE = (GPIO->ROUTE & ~_GPIO_ROUTE_SWLOCATION_MASK) |
bogdanm 0:9b334a45a8ff 81 (location << _GPIO_ROUTE_SWLOCATION_SHIFT);
bogdanm 0:9b334a45a8ff 82 #else
bogdanm 0:9b334a45a8ff 83 (void)location;
bogdanm 0:9b334a45a8ff 84 #endif
bogdanm 0:9b334a45a8ff 85 }
bogdanm 0:9b334a45a8ff 86
bogdanm 0:9b334a45a8ff 87
bogdanm 0:9b334a45a8ff 88 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 89 * @brief
bogdanm 0:9b334a45a8ff 90 * Sets the drive mode for a GPIO port.
bogdanm 0:9b334a45a8ff 91 *
bogdanm 0:9b334a45a8ff 92 * @param[in] port
bogdanm 0:9b334a45a8ff 93 * The GPIO port to access.
bogdanm 0:9b334a45a8ff 94 *
bogdanm 0:9b334a45a8ff 95 * @param[in] mode
bogdanm 0:9b334a45a8ff 96 * Drive mode to use for port.
bogdanm 0:9b334a45a8ff 97 ******************************************************************************/
bogdanm 0:9b334a45a8ff 98 void GPIO_DriveModeSet(GPIO_Port_TypeDef port, GPIO_DriveMode_TypeDef mode)
bogdanm 0:9b334a45a8ff 99 {
bogdanm 0:9b334a45a8ff 100 EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_DRIVEMODE_VALID(mode));
bogdanm 0:9b334a45a8ff 101
bogdanm 0:9b334a45a8ff 102 GPIO->P[port].CTRL = (GPIO->P[port].CTRL & ~(_GPIO_P_CTRL_DRIVEMODE_MASK))
bogdanm 0:9b334a45a8ff 103 | (mode << _GPIO_P_CTRL_DRIVEMODE_SHIFT);
bogdanm 0:9b334a45a8ff 104 }
bogdanm 0:9b334a45a8ff 105
bogdanm 0:9b334a45a8ff 106
bogdanm 0:9b334a45a8ff 107 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 108 * @brief
bogdanm 0:9b334a45a8ff 109 * Configure GPIO interrupt.
bogdanm 0:9b334a45a8ff 110 *
bogdanm 0:9b334a45a8ff 111 * @details
bogdanm 0:9b334a45a8ff 112 * If reconfiguring a GPIO interrupt that is already enabled, it is generally
bogdanm 0:9b334a45a8ff 113 * recommended to disable it first, see GPIO_Disable().
bogdanm 0:9b334a45a8ff 114 *
bogdanm 0:9b334a45a8ff 115 * The actual GPIO interrupt handler must be in place before enabling the
bogdanm 0:9b334a45a8ff 116 * interrupt.
bogdanm 0:9b334a45a8ff 117 *
bogdanm 0:9b334a45a8ff 118 * Notice that any pending interrupt for the selected pin is cleared by this
bogdanm 0:9b334a45a8ff 119 * function.
bogdanm 0:9b334a45a8ff 120 *
bogdanm 0:9b334a45a8ff 121 * @note
bogdanm 0:9b334a45a8ff 122 * A certain pin number can only be associated with one port. Ie, if GPIO
bogdanm 0:9b334a45a8ff 123 * interrupt 1 is assigned to port A/pin 1, then it is not possibly to use
bogdanm 0:9b334a45a8ff 124 * pin 1 from any other ports for interrupts. Please refer to the reference
bogdanm 0:9b334a45a8ff 125 * manual.
bogdanm 0:9b334a45a8ff 126 *
bogdanm 0:9b334a45a8ff 127 * @param[in] port
bogdanm 0:9b334a45a8ff 128 * The port to associate with @p pin.
bogdanm 0:9b334a45a8ff 129 *
bogdanm 0:9b334a45a8ff 130 * @param[in] pin
bogdanm 0:9b334a45a8ff 131 * The GPIO interrupt number (= port pin).
bogdanm 0:9b334a45a8ff 132 *
bogdanm 0:9b334a45a8ff 133 * @param[in] risingEdge
bogdanm 0:9b334a45a8ff 134 * Set to true if interrupts shall be enabled on rising edge, otherwise false.
bogdanm 0:9b334a45a8ff 135 *
bogdanm 0:9b334a45a8ff 136 * @param[in] fallingEdge
bogdanm 0:9b334a45a8ff 137 * Set to true if interrupts shall be enabled on falling edge, otherwise false.
bogdanm 0:9b334a45a8ff 138 *
bogdanm 0:9b334a45a8ff 139 * @param[in] enable
bogdanm 0:9b334a45a8ff 140 * Set to true if interrupt shall be enabled after configuration completed,
bogdanm 0:9b334a45a8ff 141 * false to leave disabled. See GPIO_IntDisable() and GPIO_IntEnable().
bogdanm 0:9b334a45a8ff 142 ******************************************************************************/
bogdanm 0:9b334a45a8ff 143 void GPIO_IntConfig(GPIO_Port_TypeDef port,
bogdanm 0:9b334a45a8ff 144 unsigned int pin,
bogdanm 0:9b334a45a8ff 145 bool risingEdge,
bogdanm 0:9b334a45a8ff 146 bool fallingEdge,
bogdanm 0:9b334a45a8ff 147 bool enable)
bogdanm 0:9b334a45a8ff 148 {
bogdanm 0:9b334a45a8ff 149 uint32_t tmp;
bogdanm 0:9b334a45a8ff 150
bogdanm 0:9b334a45a8ff 151 EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_PIN_VALID(pin));
bogdanm 0:9b334a45a8ff 152
bogdanm 0:9b334a45a8ff 153 /* There are two registers controlling the interrupt configuration:
bogdanm 0:9b334a45a8ff 154 * The EXTIPSELL register controls pins 0-7 and EXTIPSELH controls
bogdanm 0:9b334a45a8ff 155 * pins 8-15. */
bogdanm 0:9b334a45a8ff 156 if (pin < 8)
bogdanm 0:9b334a45a8ff 157 {
bogdanm 0:9b334a45a8ff 158 GPIO->EXTIPSELL = (GPIO->EXTIPSELL & ~(0xF << (4 * pin))) |
bogdanm 0:9b334a45a8ff 159 (port << (4 * pin));
bogdanm 0:9b334a45a8ff 160 }
bogdanm 0:9b334a45a8ff 161 else
bogdanm 0:9b334a45a8ff 162 {
bogdanm 0:9b334a45a8ff 163 tmp = pin - 8;
bogdanm 0:9b334a45a8ff 164 GPIO->EXTIPSELH = (GPIO->EXTIPSELH & ~(0xF << (4 * tmp))) |
bogdanm 0:9b334a45a8ff 165 (port << (4 * tmp));
bogdanm 0:9b334a45a8ff 166 }
bogdanm 0:9b334a45a8ff 167
bogdanm 0:9b334a45a8ff 168 /* Enable/disable rising edge */
bogdanm 0:9b334a45a8ff 169 BITBAND_Peripheral(&(GPIO->EXTIRISE), pin, (unsigned int)risingEdge);
bogdanm 0:9b334a45a8ff 170
bogdanm 0:9b334a45a8ff 171 /* Enable/disable falling edge */
bogdanm 0:9b334a45a8ff 172 BITBAND_Peripheral(&(GPIO->EXTIFALL), pin, (unsigned int)fallingEdge);
bogdanm 0:9b334a45a8ff 173
bogdanm 0:9b334a45a8ff 174 /* Clear any pending interrupt */
bogdanm 0:9b334a45a8ff 175 GPIO->IFC = 1 << pin;
bogdanm 0:9b334a45a8ff 176
bogdanm 0:9b334a45a8ff 177 /* Finally enable/disable interrupt */
bogdanm 0:9b334a45a8ff 178 BITBAND_Peripheral(&(GPIO->IEN), pin, (unsigned int)enable);
bogdanm 0:9b334a45a8ff 179 }
bogdanm 0:9b334a45a8ff 180
bogdanm 0:9b334a45a8ff 181
bogdanm 0:9b334a45a8ff 182 /***************************************************************************//**
bogdanm 0:9b334a45a8ff 183 * @brief
bogdanm 0:9b334a45a8ff 184 * Set the mode for a GPIO pin.
bogdanm 0:9b334a45a8ff 185 *
bogdanm 0:9b334a45a8ff 186 * @param[in] port
bogdanm 0:9b334a45a8ff 187 * The GPIO port to access.
bogdanm 0:9b334a45a8ff 188 *
bogdanm 0:9b334a45a8ff 189 * @param[in] pin
bogdanm 0:9b334a45a8ff 190 * The pin number in the port.
bogdanm 0:9b334a45a8ff 191 *
bogdanm 0:9b334a45a8ff 192 * @param[in] mode
bogdanm 0:9b334a45a8ff 193 * The desired pin mode.
bogdanm 0:9b334a45a8ff 194 *
bogdanm 0:9b334a45a8ff 195 * @param[in] out
bogdanm 0:9b334a45a8ff 196 * Value to set for pin in DOUT register. The DOUT setting is important for
bogdanm 0:9b334a45a8ff 197 * even some input mode configurations, determining pull-up/down direction.
bogdanm 0:9b334a45a8ff 198 ******************************************************************************/
bogdanm 0:9b334a45a8ff 199 void GPIO_PinModeSet(GPIO_Port_TypeDef port,
bogdanm 0:9b334a45a8ff 200 unsigned int pin,
bogdanm 0:9b334a45a8ff 201 GPIO_Mode_TypeDef mode,
bogdanm 0:9b334a45a8ff 202 unsigned int out)
bogdanm 0:9b334a45a8ff 203 {
bogdanm 0:9b334a45a8ff 204 EFM_ASSERT(GPIO_PORT_VALID(port) && GPIO_PIN_VALID(pin));
bogdanm 0:9b334a45a8ff 205
bogdanm 0:9b334a45a8ff 206 /* If disabling pin, do not modify DOUT in order to reduce chance for */
bogdanm 0:9b334a45a8ff 207 /* glitch/spike (may not be sufficient precaution in all use cases) */
bogdanm 0:9b334a45a8ff 208 if (mode != gpioModeDisabled)
bogdanm 0:9b334a45a8ff 209 {
bogdanm 0:9b334a45a8ff 210 if (out)
bogdanm 0:9b334a45a8ff 211 {
bogdanm 0:9b334a45a8ff 212 GPIO->P[port].DOUTSET = 1 << pin;
bogdanm 0:9b334a45a8ff 213 }
bogdanm 0:9b334a45a8ff 214 else
bogdanm 0:9b334a45a8ff 215 {
bogdanm 0:9b334a45a8ff 216 GPIO->P[port].DOUTCLR = 1 << pin;
bogdanm 0:9b334a45a8ff 217 }
bogdanm 0:9b334a45a8ff 218 }
bogdanm 0:9b334a45a8ff 219
bogdanm 0:9b334a45a8ff 220 /* There are two registers controlling the pins for each port. The MODEL
bogdanm 0:9b334a45a8ff 221 * register controls pins 0-7 and MODEH controls pins 8-15. */
bogdanm 0:9b334a45a8ff 222 if (pin < 8)
bogdanm 0:9b334a45a8ff 223 {
bogdanm 0:9b334a45a8ff 224 GPIO->P[port].MODEL = (GPIO->P[port].MODEL & ~(0xF << (pin * 4))) |
bogdanm 0:9b334a45a8ff 225 (mode << (pin * 4));
bogdanm 0:9b334a45a8ff 226 }
bogdanm 0:9b334a45a8ff 227 else
bogdanm 0:9b334a45a8ff 228 {
bogdanm 0:9b334a45a8ff 229 GPIO->P[port].MODEH = (GPIO->P[port].MODEH & ~(0xF << ((pin - 8) * 4))) |
bogdanm 0:9b334a45a8ff 230 (mode << ((pin - 8) * 4));
bogdanm 0:9b334a45a8ff 231 }
bogdanm 0:9b334a45a8ff 232
bogdanm 0:9b334a45a8ff 233 if (mode == gpioModeDisabled)
bogdanm 0:9b334a45a8ff 234 {
bogdanm 0:9b334a45a8ff 235 if (out)
bogdanm 0:9b334a45a8ff 236 {
bogdanm 0:9b334a45a8ff 237 GPIO->P[port].DOUTSET = 1 << pin;
bogdanm 0:9b334a45a8ff 238 }
bogdanm 0:9b334a45a8ff 239 else
bogdanm 0:9b334a45a8ff 240 {
bogdanm 0:9b334a45a8ff 241 GPIO->P[port].DOUTCLR = 1 << pin;
bogdanm 0:9b334a45a8ff 242 }
bogdanm 0:9b334a45a8ff 243 }
bogdanm 0:9b334a45a8ff 244 }
bogdanm 0:9b334a45a8ff 245
bogdanm 0:9b334a45a8ff 246 /** @} (end addtogroup GPIO) */
bogdanm 0:9b334a45a8ff 247 /** @} (end addtogroup EM_Library) */
bogdanm 0:9b334a45a8ff 248
bogdanm 0:9b334a45a8ff 249 #endif /* defined(GPIO_COUNT) && (GPIO_COUNT > 0) */