+++ /dev/null
-/* 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 "mbed_assert.h"
-#include "pwmout_api.h"
-
-#include "cmsis.h"
-#include "pinmap.h"
-#include "clk_freqs.h"
-#include "PeripheralPins.h"
-
-static float pwm_clock;
-
-void pwmout_init(pwmout_t* obj, PinName pin) {
- // determine the channel
- PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
- MBED_ASSERT(pwm != (PWMName)NC);
-
- uint32_t clkdiv = 0;
- float clkval;
-
-#if defined(TARGET_KL43Z)
- if (mcgirc_frequency()) {
- SIM->SOPT2 |= SIM_SOPT2_TPMSRC(3); // Clock source: MCGIRCLK
- clkval = mcgirc_frequency() / 1000000.0f;
- } else {
- SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: IRC48M
- clkval = CPU_INT_IRC_CLK_HZ / 1000000.0f;
- }
-#else
- if (mcgpllfll_frequency()) {
- SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK
- clkval = mcgpllfll_frequency() / 1000000.0f;
- } else {
- SIM->SOPT2 |= SIM_SOPT2_TPMSRC(2); // Clock source: ExtOsc
- clkval = extosc_frequency() / 1000000.0f;
- }
-#endif
- while (clkval > 1) {
- clkdiv++;
- clkval /= 2.0;
- if (clkdiv == 7)
- break;
- }
-
- pwm_clock = clkval;
- unsigned int port = (unsigned int)pin >> PORT_SHIFT;
- unsigned int tpm_n = (pwm >> TPM_SHIFT);
- unsigned int ch_n = (pwm & 0xFF);
-
- SIM->SCGC5 |= 1 << (SIM_SCGC5_PORTA_SHIFT + port);
- SIM->SCGC6 |= 1 << (SIM_SCGC6_TPM0_SHIFT + tpm_n);
-
- TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n);
- tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(clkdiv); // (clock)MHz / clkdiv ~= (0.75)MHz
- tpm->CONTROLS[ch_n].CnSC = (TPM_CnSC_MSB_MASK | TPM_CnSC_ELSB_MASK); /* No Interrupts; High True pulses on Edge Aligned PWM */
-
- obj->CnV = &tpm->CONTROLS[ch_n].CnV;
- obj->MOD = &tpm->MOD;
- obj->CNT = &tpm->CNT;
-
- // 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) {}
-
-void pwmout_write(pwmout_t* obj, float value) {
- if (value < 0.0) {
- value = 0.0;
- } else if (value > 1.0) {
- value = 1.0;
- }
-
- *obj->CnV = (uint32_t)((float)(*obj->MOD + 1) * value);
- *obj->CNT = 0;
-}
-
-float pwmout_read(pwmout_t* obj) {
- float v = (float)(*obj->CnV) / (float)(*obj->MOD + 1);
- return (v > 1.0) ? (1.0) : (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) {
- float dc = pwmout_read(obj);
- *obj->MOD = (uint32_t)(pwm_clock * (float)us) - 1;
- pwmout_write(obj, dc);
-}
-
-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) {
- *obj->CnV = (uint32_t)(pwm_clock * (float)us);
-}