Diff: targets/hal/TARGET_NXP/TARGET_LPC23XX/pwmout_api.c

Revision:

43:b3acfef78949

Parent:

42:7ca0bbba899b

--- a/targets/hal/TARGET_NXP/TARGET_LPC23XX/pwmout_api.c	Sun Oct 27 16:30:04 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,172 +0,0 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2013 ARM Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-#include "pwmout_api.h"
-#include "cmsis.h"
-#include "pinmap.h"
-#include "error.h"
-
-#define TCR_CNT_EN       0x00000001
-#define TCR_RESET        0x00000002
-
-//  PORT ID, PWM ID, Pin function
-static const PinMap PinMap_PWM[] = {
-    {P1_18, PWM_1, 2},
-    {P1_20, PWM_2, 2},
-    {P1_21, PWM_3, 2},
-    {P1_23, PWM_4, 2},
-    {P1_24, PWM_5, 2},
-    {P1_26, PWM_6, 2},
-    {P2_0 , PWM_1, 1},
-    {P2_1 , PWM_2, 1},
-    {P2_2 , PWM_3, 1},
-    {P2_3 , PWM_4, 1},
-    {P2_4 , PWM_5, 1},
-    {P2_5 , PWM_6, 1},
-    {P3_25, PWM_2, 3},
-    {P3_26, PWM_3, 3},
-    {NC, NC, 0}
-};
-
-__IO uint32_t *PWM_MATCH[] = {
-    &(LPC_PWM1->MR0),
-    &(LPC_PWM1->MR1),
-    &(LPC_PWM1->MR2),
-    &(LPC_PWM1->MR3),
-    &(LPC_PWM1->MR4),
-    &(LPC_PWM1->MR5),
-    &(LPC_PWM1->MR6)
-};
-
-#define TCR_PWM_EN       0x00000008
-
-static unsigned int pwm_clock_mhz;
-
-void pwmout_init(pwmout_t* obj, PinName pin) {
-    // determine the channel
-    PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
-    if (pwm == (PWMName)NC)
-        error("PwmOut pin mapping failed");
-    
-    obj->pwm = pwm;
-    obj->MR = PWM_MATCH[pwm];
-    
-    // ensure the power is on
-    LPC_SC->PCONP |= 1 << 6;
-    
-    // ensure clock to /4
-    LPC_SC->PCLKSEL0 &= ~(0x3 << 12);     // pclk = /4
-    LPC_PWM1->PR = 0;                     // no pre-scale
-    
-    // ensure single PWM mode
-    LPC_PWM1->MCR = 1 << 1; // reset TC on match 0
-    
-    // enable the specific PWM output
-    LPC_PWM1->PCR |= 1 << (8 + pwm);
-    
-    pwm_clock_mhz = SystemCoreClock / 4000000;
-    
-    // default to 20ms: standard for servos, and fine for e.g. brightness control
-    pwmout_period_ms(obj, 20);
-    pwmout_write    (obj, 0);
-    
-    // Wire pinout
-    pinmap_pinout(pin, PinMap_PWM);
-}
-
-void pwmout_free(pwmout_t* obj) {
-    // [TODO]
-}
-
-void pwmout_write(pwmout_t* obj, float value) {
-    if (value < 0.0f) {
-        value = 0.0;
-    } else if (value > 1.0f) {
-        value = 1.0;
-    }
-    
-    // set channel match to percentage
-    uint32_t v = (uint32_t)((float)(LPC_PWM1->MR0) * value);
-    
-    // workaround for PWM1[1] - Never make it equal MR0, else we get 1 cycle dropout
-    if (v == LPC_PWM1->MR0) {
-        v++;
-    }
-    
-    *obj->MR = v;
-    
-    // accept on next period start
-    LPC_PWM1->LER |= 1 << obj->pwm;
-}
-
-float pwmout_read(pwmout_t* obj) {
-    float v = (float)(*obj->MR) / (float)(LPC_PWM1->MR0);
-    return (v > 1.0f) ? (1.0f) : (v);
-}
-
-void pwmout_period(pwmout_t* obj, float seconds) {
-    pwmout_period_us(obj, seconds * 1000000.0f);
-}
-
-void pwmout_period_ms(pwmout_t* obj, int ms) {
-    pwmout_period_us(obj, ms * 1000);
-}
-
-// Set the PWM period, keeping the duty cycle the same.
-void pwmout_period_us(pwmout_t* obj, int us) {
-    // calculate number of ticks
-    uint32_t ticks = pwm_clock_mhz * us;
-    
-    // set reset
-    LPC_PWM1->TCR = TCR_RESET;
-    
-    // set the global match register
-    LPC_PWM1->MR0 = ticks;
-    
-    // Scale the pulse width to preserve the duty ratio
-    if (LPC_PWM1->MR0 > 0) {
-        *obj->MR = (*obj->MR * ticks) / LPC_PWM1->MR0;
-    }
-    
-    // set the channel latch to update value at next period start
-    LPC_PWM1->LER |= 1 << 0;
-    
-    // enable counter and pwm, clear reset
-    LPC_PWM1->TCR = TCR_CNT_EN | TCR_PWM_EN;
-}
-
-void pwmout_pulsewidth(pwmout_t* obj, float seconds) {
-    pwmout_pulsewidth_us(obj, seconds * 1000000.0f);
-}
-
-void pwmout_pulsewidth_ms(pwmout_t* obj, int ms) {
-    pwmout_pulsewidth_us(obj, ms * 1000);
-}
-
-void pwmout_pulsewidth_us(pwmout_t* obj, int us) {
-    // calculate number of ticks
-    uint32_t v = pwm_clock_mhz * us;
-    
-    // workaround for PWM1[1] - Never make it equal MR0, else we get 1 cycle dropout
-    if (v == LPC_PWM1->MR0) {
-        v++;
-    }
-    
-    // set the match register value
-    *obj->MR = v;
-    
-    // set the channel latch to update value at next period start
-    LPC_PWM1->LER |= 1 << obj->pwm;
-}