Diff: vendor/Freescale/KL25Z/hal/pwmout_api.c

Revision:

10:3bc89ef62ce7

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/Freescale/KL25Z/hal/pwmout_api.c	Fri Jun 14 17:49:17 2013 +0100
@@ -0,0 +1,121 @@
+/* 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"
+
+static const PinMap PinMap_PWM[] = {
+    // LEDs
+    {LED_RED  , PWM_9 , 3}, // PTB18, TPM2 CH0
+    {LED_GREEN, PWM_10, 3}, // PTB19, TPM2 CH1
+    {LED_BLUE , PWM_2 , 4}, // PTD1 , TPM0 CH1
+
+    // Arduino digital pinout
+    {D0,  PWM_9 , 3}, // PTA1 , TPM2 CH0
+    {D1,  PWM_10, 3}, // PTA2 , TPM2 CH1
+    {D2,  PWM_5 , 4}, // PTD4 , TPM0 CH4
+    {D3,  PWM_7 , 3}, // PTA12, TPM1 CH0
+    {D4,  PWM_2 , 3}, // PTA4 , TPM0 CH1
+    {D5,  PWM_3 , 3}, // PTA5 , TPM0 CH2
+    {D6,  PWM_5 , 3}, // PTC8 , TPM0 CH4
+    {D7,  PWM_6 , 3}, // PTC9 , TPM0 CH5
+    {D8,  PWM_8 , 3}, // PTA13, TPM1 CH1
+    {D9,  PWM_6 , 4}, // PTD5 , TPM0 CH5
+    {D10, PWM_1 , 4}, // PTD0 , TPM0 CH0
+    {D11, PWM_3 , 4}, // PTD2 , TPM0 CH2
+    {D12, PWM_4 , 4}, // PTD3 , TPM0 CH3
+    {D13, PWM_2 , 4}, // PTD1 , TPM0 CH1
+    {NC , NC    , 0}
+};
+
+#define PWM_CLOCK_MHZ       (0.75) // (48)MHz / 64 = (0.75)MHz
+
+void pwmout_init(pwmout_t* obj, PinName pin) {
+    // determine the channel
+    PWMName pwm = (PWMName)pinmap_peripheral(pin, PinMap_PWM);
+    if (pwm == (uint32_t)NC)
+        error("PwmOut pin mapping failed");
+
+    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);
+    SIM->SOPT2 |= SIM_SOPT2_TPMSRC(1); // Clock source: MCGFLLCLK or MCGPLLCLK
+
+    TPM_Type *tpm = (TPM_Type *)(TPM0_BASE + 0x1000 * tpm_n);
+    tpm->SC = TPM_SC_CMOD(1) | TPM_SC_PS(6); // (48)MHz / 64 = (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) * value);
+    *obj->CNT = 0;
+}
+
+float pwmout_read(pwmout_t* obj) {
+    float v = (float)(*obj->CnV) / (float)(*obj->MOD);
+    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 = PWM_CLOCK_MHZ * us;
+    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 = PWM_CLOCK_MHZ * us;
+}