sai kiran / mbed-src

Watchdog Timer

Fork of mbed-src by mbed official

targets/hal/TARGET_Maxim/TARGET_MAX32610/pwmout_api.c@604:3c75ef011213, 2015-08-13 (annotated)

Committer:
mbed_official
Date:
Thu Aug 13 10:30:09 2015 +0100
Revision:
604:3c75ef011213
Parent:
600:efb83a170500 
Synchronized with git revision 7cbf9896cc73d825b242028a5f95030a9e1016a4



Full URL: https://github.com/mbedmicro/mbed/commit/7cbf9896cc73d825b242028a5f95030a9e1016a4/



Added requirements.txt file

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 507:d4fc7603a669 1 /*******************************************************************************
mbed_official 507:d4fc7603a669 2 * Copyright (C) 2015 Maxim Integrated Products, Inc., All Rights Reserved.
mbed_official 507:d4fc7603a669 3 *
mbed_official 507:d4fc7603a669 4 * Permission is hereby granted, free of charge, to any person obtaining a
mbed_official 507:d4fc7603a669 5 * copy of this software and associated documentation files (the "Software"),
mbed_official 507:d4fc7603a669 6 * to deal in the Software without restriction, including without limitation
mbed_official 507:d4fc7603a669 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
mbed_official 507:d4fc7603a669 8 * and/or sell copies of the Software, and to permit persons to whom the
mbed_official 507:d4fc7603a669 9 * Software is furnished to do so, subject to the following conditions:
mbed_official 507:d4fc7603a669 10 *
mbed_official 507:d4fc7603a669 11 * The above copyright notice and this permission notice shall be included
mbed_official 507:d4fc7603a669 12 * in all copies or substantial portions of the Software.
mbed_official 507:d4fc7603a669 13 *
mbed_official 507:d4fc7603a669 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
mbed_official 507:d4fc7603a669 15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
mbed_official 507:d4fc7603a669 16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
mbed_official 507:d4fc7603a669 17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
mbed_official 507:d4fc7603a669 18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
mbed_official 507:d4fc7603a669 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
mbed_official 507:d4fc7603a669 20 * OTHER DEALINGS IN THE SOFTWARE.
mbed_official 507:d4fc7603a669 21 *
mbed_official 507:d4fc7603a669 22 * Except as contained in this notice, the name of Maxim Integrated
mbed_official 507:d4fc7603a669 23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
mbed_official 507:d4fc7603a669 24 * Products, Inc. Branding Policy.
mbed_official 507:d4fc7603a669 25 *
mbed_official 507:d4fc7603a669 26 * The mere transfer of this software does not imply any licenses
mbed_official 507:d4fc7603a669 27 * of trade secrets, proprietary technology, copyrights, patents,
mbed_official 507:d4fc7603a669 28 * trademarks, maskwork rights, or any other form of intellectual
mbed_official 507:d4fc7603a669 29 * property whatsoever. Maxim Integrated Products, Inc. retains all
mbed_official 507:d4fc7603a669 30 * ownership rights.
mbed_official 507:d4fc7603a669 31 *******************************************************************************
mbed_official 507:d4fc7603a669 32 */
mbed_official 507:d4fc7603a669 33
mbed_official 507:d4fc7603a669 34 #include "mbed_assert.h"
mbed_official 507:d4fc7603a669 35 #include "cmsis.h"
mbed_official 507:d4fc7603a669 36 #include "pwmout_api.h"
mbed_official 507:d4fc7603a669 37 #include "pinmap.h"
mbed_official 507:d4fc7603a669 38 #include "ioman_regs.h"
mbed_official 507:d4fc7603a669 39 #include "clkman_regs.h"
mbed_official 507:d4fc7603a669 40 #include "PeripheralPins.h"
mbed_official 507:d4fc7603a669 41
mbed_official 507:d4fc7603a669 42 //******************************************************************************
mbed_official 507:d4fc7603a669 43 void pwmout_init(pwmout_t* obj, PinName pin)
mbed_official 507:d4fc7603a669 44 {
mbed_official 507:d4fc7603a669 45 // Make sure the pin is free for GPIO use
mbed_official 507:d4fc7603a669 46 unsigned int port = (unsigned int)pin >> PORT_SHIFT;
mbed_official 507:d4fc7603a669 47 unsigned int port_pin = (unsigned int)pin & ~(0xFFFFFFFF << PORT_SHIFT);
mbed_official 507:d4fc7603a669 48 MBED_ASSERT(MXC_GPIO->free[port] & (0x1 << port_pin));
mbed_official 507:d4fc7603a669 49
mbed_official 507:d4fc7603a669 50 int i = 0;
mbed_official 507:d4fc7603a669 51 PinMap pwm = PinMap_PWM[0];
mbed_official 507:d4fc7603a669 52
mbed_official 507:d4fc7603a669 53 // Check if there is a pulse train already active on this port
mbed_official 507:d4fc7603a669 54 int pin_func = (MXC_GPIO->func_sel[port] & (0xF << (port_pin*4))) >> (port_pin*4);
mbed_official 604:3c75ef011213 55 MBED_ASSERT((pin_func < 1) || (pin_func > 3));
mbed_official 604:3c75ef011213 56
mbed_official 604:3c75ef011213 57 // Search through PinMap_PWM to find the pin
mbed_official 604:3c75ef011213 58 while(pwm.pin != pin) {
mbed_official 604:3c75ef011213 59 pwm = PinMap_PWM[++i];
mbed_official 604:3c75ef011213 60 }
mbed_official 604:3c75ef011213 61
mbed_official 604:3c75ef011213 62 // Find a free PT instance on this pin
mbed_official 604:3c75ef011213 63 while(pwm.pin == pin) {
mbed_official 604:3c75ef011213 64
mbed_official 604:3c75ef011213 65 // Check to see if this PT instance is free
mbed_official 604:3c75ef011213 66 if((((mxc_pt_regs_t*)pwm.peripheral)->rate_length &
mbed_official 604:3c75ef011213 67 MXC_F_PT_RATE_LENGTH_MODE)) {
mbed_official 604:3c75ef011213 68 break;
mbed_official 507:d4fc7603a669 69 }
mbed_official 507:d4fc7603a669 70
mbed_official 604:3c75ef011213 71 pwm = PinMap_PWM[++i];
mbed_official 507:d4fc7603a669 72
mbed_official 604:3c75ef011213 73 // Raise an assertion if we can not allocate another PT instance.
mbed_official 604:3c75ef011213 74 MBED_ASSERT(pwm.pin == pin);
mbed_official 507:d4fc7603a669 75 }
mbed_official 507:d4fc7603a669 76
mbed_official 507:d4fc7603a669 77 // Enable the clock
mbed_official 507:d4fc7603a669 78 MXC_CLKMAN->clk_ctrl_2_pt = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
mbed_official 507:d4fc7603a669 79
mbed_official 507:d4fc7603a669 80 // Set the obj pointer to the propper PWM instance
mbed_official 507:d4fc7603a669 81 obj->pwm = (mxc_pt_regs_t*)pwm.peripheral;
mbed_official 507:d4fc7603a669 82
mbed_official 507:d4fc7603a669 83 // Initialize object period and pulse width
mbed_official 507:d4fc7603a669 84 obj->period = -1;
mbed_official 507:d4fc7603a669 85 obj->pulse_width = -1;
mbed_official 507:d4fc7603a669 86
mbed_official 507:d4fc7603a669 87 // Disable the output
mbed_official 507:d4fc7603a669 88 obj->pwm->train = 0x0;
mbed_official 507:d4fc7603a669 89 obj->pwm->rate_length = 0x0;
mbed_official 507:d4fc7603a669 90
mbed_official 507:d4fc7603a669 91 // Configure the pin
mbed_official 507:d4fc7603a669 92 pin_mode(pin, (PinMode)PullNone);
mbed_official 507:d4fc7603a669 93 pin_function(pin, pwm.function);
mbed_official 507:d4fc7603a669 94
mbed_official 507:d4fc7603a669 95 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 507:d4fc7603a669 96 pwmout_period_us(obj, 20000);
mbed_official 507:d4fc7603a669 97 pwmout_write (obj, 0);
mbed_official 507:d4fc7603a669 98
mbed_official 604:3c75ef011213 99 // Set the drive mode to normal
mbed_official 604:3c75ef011213 100 MXC_SET_FIELD(&MXC_GPIO->out_mode[port], (0x7 << (port_pin*4)), (MXC_V_GPIO_OUT_MODE_NORMAL_DRIVE << (port_pin*4)));
mbed_official 604:3c75ef011213 101
mbed_official 507:d4fc7603a669 102 // Enable the global pwm
mbed_official 507:d4fc7603a669 103 MXC_PTG->ctrl = MXC_F_PT_CTRL_ENABLE_ALL;
mbed_official 507:d4fc7603a669 104 }
mbed_official 507:d4fc7603a669 105
mbed_official 507:d4fc7603a669 106 //******************************************************************************
mbed_official 507:d4fc7603a669 107 void pwmout_free(pwmout_t* obj)
mbed_official 507:d4fc7603a669 108 {
mbed_official 507:d4fc7603a669 109 // Set the registers to the reset value
mbed_official 507:d4fc7603a669 110 obj->pwm->train = 0;
mbed_official 507:d4fc7603a669 111 obj->pwm->rate_length = 0x08000000;
mbed_official 507:d4fc7603a669 112 }
mbed_official 507:d4fc7603a669 113
mbed_official 507:d4fc7603a669 114 //******************************************************************************
mbed_official 507:d4fc7603a669 115 static void pwmout_update(pwmout_t* obj)
mbed_official 507:d4fc7603a669 116 {
mbed_official 507:d4fc7603a669 117 // Calculate and set the divider ratio
mbed_official 507:d4fc7603a669 118 int div = (obj->period * (SystemCoreClock/1000000))/32;
mbed_official 507:d4fc7603a669 119 if (div < 2){
mbed_official 507:d4fc7603a669 120 div = 2;
mbed_official 507:d4fc7603a669 121 }
mbed_official 507:d4fc7603a669 122 MXC_SET_FIELD(&obj->pwm->rate_length, MXC_F_PT_RATE_LENGTH_RATE_CONTROL, div);
mbed_official 507:d4fc7603a669 123
mbed_official 507:d4fc7603a669 124 // Change the duty cycle to adjust the pulse width
mbed_official 507:d4fc7603a669 125 obj->pwm->train = (0xFFFFFFFF << (32-((32*obj->pulse_width)/obj->period)));
mbed_official 507:d4fc7603a669 126 }
mbed_official 507:d4fc7603a669 127
mbed_official 507:d4fc7603a669 128
mbed_official 507:d4fc7603a669 129 //******************************************************************************
mbed_official 507:d4fc7603a669 130 void pwmout_write(pwmout_t* obj, float percent)
mbed_official 507:d4fc7603a669 131 {
mbed_official 507:d4fc7603a669 132 // Saturate percent if outside of range
mbed_official 507:d4fc7603a669 133 if(percent < 0.0) {
mbed_official 507:d4fc7603a669 134 percent = 0.0;
mbed_official 507:d4fc7603a669 135 } else if(percent > 1.0) {
mbed_official 507:d4fc7603a669 136 percent = 1.0;
mbed_official 507:d4fc7603a669 137 }
mbed_official 507:d4fc7603a669 138
mbed_official 507:d4fc7603a669 139 // Resize the pulse width to set the duty cycle
mbed_official 507:d4fc7603a669 140 pwmout_pulsewidth_us(obj, (int)(percent*obj->period));
mbed_official 507:d4fc7603a669 141 }
mbed_official 507:d4fc7603a669 142
mbed_official 507:d4fc7603a669 143 //******************************************************************************
mbed_official 507:d4fc7603a669 144 float pwmout_read(pwmout_t* obj)
mbed_official 507:d4fc7603a669 145 {
mbed_official 507:d4fc7603a669 146 // Check for when pulsewidth or period equals 0
mbed_official 507:d4fc7603a669 147 if((obj->pulse_width == 0) || (obj->period == 0)){
mbed_official 507:d4fc7603a669 148 return 0;
mbed_official 507:d4fc7603a669 149 }
mbed_official 507:d4fc7603a669 150
mbed_official 507:d4fc7603a669 151 // Return the duty cycle
mbed_official 507:d4fc7603a669 152 return ((float)obj->pulse_width / (float)obj->period);
mbed_official 507:d4fc7603a669 153 }
mbed_official 507:d4fc7603a669 154
mbed_official 507:d4fc7603a669 155 //******************************************************************************
mbed_official 507:d4fc7603a669 156 void pwmout_period(pwmout_t* obj, float seconds)
mbed_official 507:d4fc7603a669 157 {
mbed_official 507:d4fc7603a669 158 pwmout_period_us(obj, (int)(seconds * 1000000.0));
mbed_official 507:d4fc7603a669 159 }
mbed_official 507:d4fc7603a669 160
mbed_official 507:d4fc7603a669 161 //******************************************************************************
mbed_official 507:d4fc7603a669 162 void pwmout_period_ms(pwmout_t* obj, int ms)
mbed_official 507:d4fc7603a669 163 {
mbed_official 507:d4fc7603a669 164 pwmout_period_us(obj, ms*1000);
mbed_official 507:d4fc7603a669 165 }
mbed_official 507:d4fc7603a669 166
mbed_official 507:d4fc7603a669 167 //******************************************************************************
mbed_official 507:d4fc7603a669 168 void pwmout_period_us(pwmout_t* obj, int us)
mbed_official 507:d4fc7603a669 169 {
mbed_official 507:d4fc7603a669 170 // Check the range of the period
mbed_official 507:d4fc7603a669 171 MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
mbed_official 507:d4fc7603a669 172
mbed_official 507:d4fc7603a669 173 // Set pulse width to half the period if uninitialized
mbed_official 507:d4fc7603a669 174 if(obj->pulse_width == -1){
mbed_official 507:d4fc7603a669 175 obj->pulse_width = us/2;
mbed_official 507:d4fc7603a669 176 }
mbed_official 507:d4fc7603a669 177
mbed_official 507:d4fc7603a669 178 // Save the period
mbed_official 507:d4fc7603a669 179 obj->period = us;
mbed_official 507:d4fc7603a669 180
mbed_official 507:d4fc7603a669 181 // Update the registers
mbed_official 507:d4fc7603a669 182 pwmout_update(obj);
mbed_official 507:d4fc7603a669 183 }
mbed_official 507:d4fc7603a669 184
mbed_official 507:d4fc7603a669 185 //******************************************************************************
mbed_official 507:d4fc7603a669 186 void pwmout_pulsewidth(pwmout_t* obj, float seconds)
mbed_official 507:d4fc7603a669 187 {
mbed_official 507:d4fc7603a669 188 pwmout_pulsewidth_us(obj, (int)(seconds * 1000000.0));
mbed_official 507:d4fc7603a669 189 }
mbed_official 507:d4fc7603a669 190
mbed_official 507:d4fc7603a669 191 //******************************************************************************
mbed_official 507:d4fc7603a669 192 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
mbed_official 507:d4fc7603a669 193 {
mbed_official 507:d4fc7603a669 194 pwmout_pulsewidth_us(obj, ms*1000);
mbed_official 507:d4fc7603a669 195 }
mbed_official 507:d4fc7603a669 196
mbed_official 507:d4fc7603a669 197 //******************************************************************************
mbed_official 507:d4fc7603a669 198 void pwmout_pulsewidth_us(pwmout_t* obj, int us)
mbed_official 507:d4fc7603a669 199 {
mbed_official 507:d4fc7603a669 200 // Check the range of the pulsewidth
mbed_official 507:d4fc7603a669 201 MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
mbed_official 507:d4fc7603a669 202
mbed_official 507:d4fc7603a669 203 // Initialize period to double the pulsewidth if uninitialized
mbed_official 507:d4fc7603a669 204 if(obj->period == -1){
mbed_official 507:d4fc7603a669 205 obj->period = 2*us;
mbed_official 507:d4fc7603a669 206 }
mbed_official 507:d4fc7603a669 207
mbed_official 507:d4fc7603a669 208 // Save the pulsewidth
mbed_official 507:d4fc7603a669 209 obj->pulse_width = us;
mbed_official 507:d4fc7603a669 210
mbed_official 507:d4fc7603a669 211 // Update the register
mbed_official 507:d4fc7603a669 212 pwmout_update(obj);
mbed_official 507:d4fc7603a669 213 }