Stuart Northfield / mbed-src

mbed library sources

Fork of mbed-src by mbed official

targets/hal/TARGET_RENESAS/TARGET_RZ_A1H/pwmout_api.c@390:35c2c1cf29cd, 2014-11-06 (annotated)

Committer:
mbed_official
Date:
Thu Nov 06 11:00:10 2014 +0000
Revision:
390:35c2c1cf29cd
Synchronized with git revision 8724eb616b6e07a3bd111d3022652eb5bbefe9b7



Full URL: https://github.com/mbedmicro/mbed/commit/8724eb616b6e07a3bd111d3022652eb5bbefe9b7/



[RZ/A1H] mbed-RZ first release

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 390:35c2c1cf29cd 1 /* mbed Microcontroller Library
mbed_official 390:35c2c1cf29cd 2 * Copyright (c) 2006-2013 ARM Limited
mbed_official 390:35c2c1cf29cd 3 *
mbed_official 390:35c2c1cf29cd 4 * Licensed under the Apache License, Version 2.0 (the "License");
mbed_official 390:35c2c1cf29cd 5 * you may not use this file except in compliance with the License.
mbed_official 390:35c2c1cf29cd 6 * You may obtain a copy of the License at
mbed_official 390:35c2c1cf29cd 7 *
mbed_official 390:35c2c1cf29cd 8 * http://www.apache.org/licenses/LICENSE-2.0
mbed_official 390:35c2c1cf29cd 9 *
mbed_official 390:35c2c1cf29cd 10 * Unless required by applicable law or agreed to in writing, software
mbed_official 390:35c2c1cf29cd 11 * distributed under the License is distributed on an "AS IS" BASIS,
mbed_official 390:35c2c1cf29cd 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbed_official 390:35c2c1cf29cd 13 * See the License for the specific language governing permissions and
mbed_official 390:35c2c1cf29cd 14 * limitations under the License.
mbed_official 390:35c2c1cf29cd 15 */
mbed_official 390:35c2c1cf29cd 16 #include "mbed_assert.h"
mbed_official 390:35c2c1cf29cd 17 #include "pwmout_api.h"
mbed_official 390:35c2c1cf29cd 18 #include "cmsis.h"
mbed_official 390:35c2c1cf29cd 19 #include "pinmap.h"
mbed_official 390:35c2c1cf29cd 20
mbed_official 390:35c2c1cf29cd 21 #include "cpg_iodefine.h"
mbed_official 390:35c2c1cf29cd 22 #include "pwm_iodefine.h"
mbed_official 390:35c2c1cf29cd 23
mbed_official 390:35c2c1cf29cd 24 #define TCR_CNT_EN 0x00000001
mbed_official 390:35c2c1cf29cd 25 #define TCR_RESET 0x00000002
mbed_official 390:35c2c1cf29cd 26
mbed_official 390:35c2c1cf29cd 27 // PORT ID, PWM ID, Pin function
mbed_official 390:35c2c1cf29cd 28 static const PinMap PinMap_PWM[] = {
mbed_official 390:35c2c1cf29cd 29 {LED_RED , 0, 4},
mbed_official 390:35c2c1cf29cd 30 {LED_GREEN, 1, 4},
mbed_official 390:35c2c1cf29cd 31 {LED_BLUE , 2, 4},
mbed_official 390:35c2c1cf29cd 32 {P4_7 , 3, 4},
mbed_official 390:35c2c1cf29cd 33 {P8_14 , 4, 6},
mbed_official 390:35c2c1cf29cd 34 {P8_15 , 5, 6},
mbed_official 390:35c2c1cf29cd 35 {P8_13 , 6, 6},
mbed_official 390:35c2c1cf29cd 36 {P8_11 , 7, 6},
mbed_official 390:35c2c1cf29cd 37 {NC, NC, 0}
mbed_official 390:35c2c1cf29cd 38 };
mbed_official 390:35c2c1cf29cd 39
mbed_official 390:35c2c1cf29cd 40 static __IO uint16_t PORT[] = {
mbed_official 390:35c2c1cf29cd 41 PWM2E,
mbed_official 390:35c2c1cf29cd 42 PWM2F,
mbed_official 390:35c2c1cf29cd 43 PWM2G,
mbed_official 390:35c2c1cf29cd 44 PWM2H,
mbed_official 390:35c2c1cf29cd 45 PWM1G,
mbed_official 390:35c2c1cf29cd 46 PWM1H,
mbed_official 390:35c2c1cf29cd 47 PWM1F,
mbed_official 390:35c2c1cf29cd 48 PWM1D,
mbed_official 390:35c2c1cf29cd 49 };
mbed_official 390:35c2c1cf29cd 50 static __IO uint16_t *PWM_MATCH[] = {
mbed_official 390:35c2c1cf29cd 51 &PWMPWBFR_2E,
mbed_official 390:35c2c1cf29cd 52 &PWMPWBFR_2E,
mbed_official 390:35c2c1cf29cd 53 &PWMPWBFR_2G,
mbed_official 390:35c2c1cf29cd 54 &PWMPWBFR_2G,
mbed_official 390:35c2c1cf29cd 55 &PWMPWBFR_1G,
mbed_official 390:35c2c1cf29cd 56 &PWMPWBFR_1G,
mbed_official 390:35c2c1cf29cd 57 &PWMPWBFR_1E,
mbed_official 390:35c2c1cf29cd 58 &PWMPWBFR_1C,
mbed_official 390:35c2c1cf29cd 59 };
mbed_official 390:35c2c1cf29cd 60
mbed_official 390:35c2c1cf29cd 61 #define TCR_PWM_EN 0x00000008
mbed_official 390:35c2c1cf29cd 62
mbed_official 390:35c2c1cf29cd 63 static unsigned int pwm_clock_mhz;
mbed_official 390:35c2c1cf29cd 64
mbed_official 390:35c2c1cf29cd 65 void pwmout_init(pwmout_t* obj, PinName pin) {
mbed_official 390:35c2c1cf29cd 66 // determine the channel
mbed_official 390:35c2c1cf29cd 67 PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
mbed_official 390:35c2c1cf29cd 68 MBED_ASSERT(pwm != (PWMName)NC);
mbed_official 390:35c2c1cf29cd 69
mbed_official 390:35c2c1cf29cd 70 obj->pwm = pwm;
mbed_official 390:35c2c1cf29cd 71 obj->MR = PWM_MATCH[pwm];
mbed_official 390:35c2c1cf29cd 72 obj->flag = (PORT[pwm]&1)<<12;
mbed_official 390:35c2c1cf29cd 73
mbed_official 390:35c2c1cf29cd 74 // power on
mbed_official 390:35c2c1cf29cd 75 CPGSTBCR3 &= ~(1<<0);
mbed_official 390:35c2c1cf29cd 76
mbed_official 390:35c2c1cf29cd 77 // clk mode settings PWM mode
mbed_official 390:35c2c1cf29cd 78 PWMPWCR_1_BYTE_L = 0xc4;
mbed_official 390:35c2c1cf29cd 79 PWMPWCR_2_BYTE_L = 0xc4;
mbed_official 390:35c2c1cf29cd 80
mbed_official 390:35c2c1cf29cd 81 // output settings
mbed_official 390:35c2c1cf29cd 82 PWMPWPR_1_BYTE_L = 0x00;
mbed_official 390:35c2c1cf29cd 83 PWMPWPR_2_BYTE_L = 0x00;
mbed_official 390:35c2c1cf29cd 84
mbed_official 390:35c2c1cf29cd 85 // cycle reg.
mbed_official 390:35c2c1cf29cd 86 PWMPWCYR_1 = 0x3ff;
mbed_official 390:35c2c1cf29cd 87 PWMPWCYR_2 = 0x3ff;
mbed_official 390:35c2c1cf29cd 88
mbed_official 390:35c2c1cf29cd 89 //pwm_clock_mhz = SystemCoreClock / 4000000;
mbed_official 390:35c2c1cf29cd 90
mbed_official 390:35c2c1cf29cd 91 PWMPWCR_1_BYTE_L = 0xcc;
mbed_official 390:35c2c1cf29cd 92 PWMPWCR_2_BYTE_L = 0xcc;
mbed_official 390:35c2c1cf29cd 93 // default to 20ms: standard for servos, and fine for e.g. brightness control
mbed_official 390:35c2c1cf29cd 94 //pwmout_period_ms(obj, 20);
mbed_official 390:35c2c1cf29cd 95 //pwmout_write (obj, 0);
mbed_official 390:35c2c1cf29cd 96
mbed_official 390:35c2c1cf29cd 97 // Wire pinout
mbed_official 390:35c2c1cf29cd 98 pinmap_pinout(pin, PinMap_PWM);
mbed_official 390:35c2c1cf29cd 99
mbed_official 390:35c2c1cf29cd 100 }
mbed_official 390:35c2c1cf29cd 101
mbed_official 390:35c2c1cf29cd 102 void pwmout_free(pwmout_t* obj) {
mbed_official 390:35c2c1cf29cd 103 // [TODO]
mbed_official 390:35c2c1cf29cd 104 }
mbed_official 390:35c2c1cf29cd 105
mbed_official 390:35c2c1cf29cd 106 void pwmout_write(pwmout_t* obj, float value) {
mbed_official 390:35c2c1cf29cd 107 if (value < 0.0f) {
mbed_official 390:35c2c1cf29cd 108 value = 0.0;
mbed_official 390:35c2c1cf29cd 109 } else if (value > 1.0f) {
mbed_official 390:35c2c1cf29cd 110 value = 1.0;
mbed_official 390:35c2c1cf29cd 111 }
mbed_official 390:35c2c1cf29cd 112
mbed_official 390:35c2c1cf29cd 113 // set channel match to percentage
mbed_official 390:35c2c1cf29cd 114 uint16_t v = (uint32_t)((float)0x3ff* value);
mbed_official 390:35c2c1cf29cd 115
mbed_official 390:35c2c1cf29cd 116 v |= (obj->flag);
mbed_official 390:35c2c1cf29cd 117
mbed_official 390:35c2c1cf29cd 118 // workaround for PWM1[1] - Never make it equal MR0, else we get 1 cycle dropout
mbed_official 390:35c2c1cf29cd 119 *obj->MR = v;
mbed_official 390:35c2c1cf29cd 120
mbed_official 390:35c2c1cf29cd 121 // accept on next period start
mbed_official 390:35c2c1cf29cd 122 //LPC_PWM1->LER |= 1 << obj->pwm;
mbed_official 390:35c2c1cf29cd 123 }
mbed_official 390:35c2c1cf29cd 124
mbed_official 390:35c2c1cf29cd 125 float pwmout_read(pwmout_t* obj) {
mbed_official 390:35c2c1cf29cd 126 float v = (float)((*obj->MR&0x3ff)) / 0x3ff;
mbed_official 390:35c2c1cf29cd 127 return (v > 1.0f) ? (1.0f) : (v);
mbed_official 390:35c2c1cf29cd 128 }
mbed_official 390:35c2c1cf29cd 129
mbed_official 390:35c2c1cf29cd 130 void pwmout_period(pwmout_t* obj, float seconds) {
mbed_official 390:35c2c1cf29cd 131 pwmout_period_us(obj, seconds * 1000000.0f);
mbed_official 390:35c2c1cf29cd 132 }
mbed_official 390:35c2c1cf29cd 133
mbed_official 390:35c2c1cf29cd 134 void pwmout_period_ms(pwmout_t* obj, int ms) {
mbed_official 390:35c2c1cf29cd 135 pwmout_period_us(obj, ms * 1000);
mbed_official 390:35c2c1cf29cd 136 }
mbed_official 390:35c2c1cf29cd 137
mbed_official 390:35c2c1cf29cd 138 // Set the PWM period, keeping the duty cycle the same.
mbed_official 390:35c2c1cf29cd 139 void pwmout_period_us(pwmout_t* obj, int us) {
mbed_official 390:35c2c1cf29cd 140 // calculate number of ticks
mbed_official 390:35c2c1cf29cd 141 uint16_t ticks = 0x3ff * us;
mbed_official 390:35c2c1cf29cd 142
mbed_official 390:35c2c1cf29cd 143 // stop timer
mbed_official 390:35c2c1cf29cd 144 *obj->MR = ticks;
mbed_official 390:35c2c1cf29cd 145
mbed_official 390:35c2c1cf29cd 146 // Scale the pulse width to preserve the duty ratio
mbed_official 390:35c2c1cf29cd 147
mbed_official 390:35c2c1cf29cd 148 // set the channel latch to update value at next period start
mbed_official 390:35c2c1cf29cd 149 // LPC_PWM1->LER |= 1 << 0;
mbed_official 390:35c2c1cf29cd 150
mbed_official 390:35c2c1cf29cd 151 // enable counter and pwm, clear reset
mbed_official 390:35c2c1cf29cd 152 // LPC_PWM1->TCR = TCR_CNT_EN | TCR_PWM_EN;
mbed_official 390:35c2c1cf29cd 153 }
mbed_official 390:35c2c1cf29cd 154
mbed_official 390:35c2c1cf29cd 155 void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
mbed_official 390:35c2c1cf29cd 156 pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
mbed_official 390:35c2c1cf29cd 157 }
mbed_official 390:35c2c1cf29cd 158
mbed_official 390:35c2c1cf29cd 159 void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
mbed_official 390:35c2c1cf29cd 160 pwmout_pulsewidth_us(obj, ms * 1000);
mbed_official 390:35c2c1cf29cd 161 }
mbed_official 390:35c2c1cf29cd 162
mbed_official 390:35c2c1cf29cd 163 void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
mbed_official 390:35c2c1cf29cd 164 // calculate number of ticks
mbed_official 390:35c2c1cf29cd 165 uint32_t v = pwm_clock_mhz * us;
mbed_official 390:35c2c1cf29cd 166
mbed_official 390:35c2c1cf29cd 167 // workaround for PWM1[1] - Never make it equal MR0, else we get 1 cycle dropout
mbed_official 390:35c2c1cf29cd 168
mbed_official 390:35c2c1cf29cd 169 // set the match register value
mbed_official 390:35c2c1cf29cd 170 *obj->MR = v;
mbed_official 390:35c2c1cf29cd 171
mbed_official 390:35c2c1cf29cd 172 // set the channel latch to update value at next period start
mbed_official 390:35c2c1cf29cd 173 //LPC_PWM1->LER |= 1 << obj->pwm;
mbed_official 390:35c2c1cf29cd 174 }