+++ /dev/null
-/*******************************************************************************
- * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
- * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
- * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
- * OTHER DEALINGS IN THE SOFTWARE.
- *
- * Except as contained in this notice, the name of Maxim Integrated
- * Products, Inc. shall not be used except as stated in the Maxim Integrated
- * Products, Inc. Branding Policy.
- *
- * The mere transfer of this software does not imply any licenses
- * of trade secrets, proprietary technology, copyrights, patents,
- * trademarks, maskwork rights, or any other form of intellectual
- * property whatsoever. Maxim Integrated Products, Inc. retains all
- * ownership rights.
- *******************************************************************************
- */
-
-#include "mbed_assert.h"
-#include "cmsis.h"
-#include "pwmout_api.h"
-#include "pinmap.h"
-#include "ioman_regs.h"
-#include "clkman_regs.h"
-#include "PeripheralPins.h"
-
-//******************************************************************************
-void pwmout_init(pwmout_t* obj, PinName pin)
-{
- // Make sure the pin is free for GPIO use
- unsigned int port = (unsigned int)pin >> PORT_SHIFT;
- unsigned int port_pin = (unsigned int)pin & ~(0xFFFFFFFF << PORT_SHIFT);
- MBED_ASSERT(MXC_GPIO->free[port] & (0x1 << port_pin));
-
- int i = 0;
- PinMap pwm = PinMap_PWM[0];
-
- // Check if there is a pulse train already active on this port
- int pin_func = (MXC_GPIO->func_sel[port] & (0xF << (port_pin*4))) >> (port_pin*4);
- if((pin_func > 0) && (pin_func < 4)) {
- // Search through PinMap_PWM to find the active PT
- while(pwm.pin != (PinName)NC) {
- if((pwm.pin == pin) && (pwm.function == pin_func)) {
- break;
- }
- pwm = PinMap_PWM[++i];
- }
-
- } else {
- // Search through PinMap_PWM to find an available PT
- int i = 0;
- while(pwm.pin != (PinName)NC && (i > -1)) {
- pwm = PinMap_PWM[i++];
- if(pwm.pin == pin) {
- // Check each instance of PT
- while(1) {
- // Check to see if this PT instance is already in use
- if((((mxc_pt_regs_t*)pwm.peripheral)->rate_length &
- MXC_F_PT_RATE_LENGTH_MODE)) {
- i = -1;
- break;
- }
-
- // If all instances are in use, overwrite the last
- pwm = PinMap_PWM[++i];
- if(pwm.pin != pin) {
- pwm = PinMap_PWM[--i];
- i = -1;
- break;
- }
-
- }
- }
- }
- }
-
- // Make sure we found an available PWM generator
- MBED_ASSERT(pwm.pin != (PinName)NC);
-
- // Disable all pwm output
- MXC_PTG->ctrl = 0;
-
- // Enable the clock
- MXC_CLKMAN->clk_ctrl_2_pt = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
-
- // Set the drive mode to normal
- MXC_SET_FIELD(&MXC_GPIO->out_mode[port], (0x7 << (port_pin*4)), (MXC_V_GPIO_OUT_MODE_NORMAL_DRIVE << (port_pin*4)));
-
- // Set the obj pointer to the propper PWM instance
- obj->pwm = (mxc_pt_regs_t*)pwm.peripheral;
-
- // Initialize object period and pulse width
- obj->period = -1;
- obj->pulse_width = -1;
-
- // Disable the output
- obj->pwm->train = 0x0;
- obj->pwm->rate_length = 0x0;
-
- // Configure the pin
- pin_mode(pin, (PinMode)PullNone);
- pin_function(pin, pwm.function);
-
- // default to 20ms: standard for servos, and fine for e.g. brightness control
- pwmout_period_us(obj, 20000);
- pwmout_write (obj, 0);
-
- // Enable the global pwm
- MXC_PTG->ctrl = MXC_F_PT_CTRL_ENABLE_ALL;
-}
-
-//******************************************************************************
-void pwmout_free(pwmout_t* obj)
-{
- // Set the registers to the reset value
- obj->pwm->train = 0;
- obj->pwm->rate_length = 0x08000000;
-}
-
-//******************************************************************************
-static void pwmout_update(pwmout_t* obj)
-{
- // Calculate and set the divider ratio
- int div = (obj->period * (SystemCoreClock/1000000))/32;
- if (div < 2){
- div = 2;
- }
- MXC_SET_FIELD(&obj->pwm->rate_length, MXC_F_PT_RATE_LENGTH_RATE_CONTROL, div);
-
- // Change the duty cycle to adjust the pulse width
- obj->pwm->train = (0xFFFFFFFF << (32-((32*obj->pulse_width)/obj->period)));
-}
-
-
-//******************************************************************************
-void pwmout_write(pwmout_t* obj, float percent)
-{
- // Saturate percent if outside of range
- if(percent < 0.0) {
- percent = 0.0;
- } else if(percent > 1.0) {
- percent = 1.0;
- }
-
- // Resize the pulse width to set the duty cycle
- pwmout_pulsewidth_us(obj, (int)(percent*obj->period));
-}
-
-//******************************************************************************
-float pwmout_read(pwmout_t* obj)
-{
- // Check for when pulsewidth or period equals 0
- if((obj->pulse_width == 0) || (obj->period == 0)){
- return 0;
- }
-
- // Return the duty cycle
- return ((float)obj->pulse_width / (float)obj->period);
-}
-
-//******************************************************************************
-void pwmout_period(pwmout_t* obj, float seconds)
-{
- pwmout_period_us(obj, (int)(seconds * 1000000.0));
-}
-
-//******************************************************************************
-void pwmout_period_ms(pwmout_t* obj, int ms)
-{
- pwmout_period_us(obj, ms*1000);
-}
-
-//******************************************************************************
-void pwmout_period_us(pwmout_t* obj, int us)
-{
- // Check the range of the period
- MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
-
- // Set pulse width to half the period if uninitialized
- if(obj->pulse_width == -1){
- obj->pulse_width = us/2;
- }
-
- // Save the period
- obj->period = us;
-
- // Update the registers
- pwmout_update(obj);
-}
-
-//******************************************************************************
-void pwmout_pulsewidth(pwmout_t* obj, float seconds)
-{
- pwmout_pulsewidth_us(obj, (int)(seconds * 1000000.0));
-}
-
-//******************************************************************************
-void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
-{
- pwmout_pulsewidth_us(obj, ms*1000);
-}
-
-//******************************************************************************
-void pwmout_pulsewidth_us(pwmout_t* obj, int us)
-{
- // Check the range of the pulsewidth
- MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
-
- // Initialize period to double the pulsewidth if uninitialized
- if(obj->period == -1){
- obj->period = 2*us;
- }
-
- // Save the pulsewidth
- obj->pulse_width = us;
-
- // Update the register
- pwmout_update(obj);
-}
projects / qmk_firmware.git / blobdiff