pwmout - MAX32600 - add read methods for period and pulsewidth

targets/TARGET_Maxim/TARGET_MAX32600/pwmout_api.c

@@ -40,7 +40,7 @@
 #include "PeripheralPins.h"
 
 //******************************************************************************
-void pwmout_init(pwmout_t* obj, PinName pin)
+void pwmout_init(pwmout_t *obj, PinName pin)
 {
     // Make sure the pin is free for GPIO use
     unsigned int port = (unsigned int)pin >> PORT_SHIFT;
@@ -51,20 +51,20 @@ void pwmout_init(pwmout_t* obj, PinName pin)
     PinMap pwm = PinMap_PWM[0];
 
     // Check if there is a pulse train already active on this port
-    int pin_func = (MXC_GPIO->func_sel[port] & (0xF << (port_pin*4))) >> (port_pin*4);
+    int pin_func = (MXC_GPIO->func_sel[port] & (0xF << (port_pin * 4))) >> (port_pin * 4);
     MBED_ASSERT((pin_func < 1) || (pin_func > 3));
 
     // Search through PinMap_PWM to find the pin
-    while(pwm.pin != pin) {
+    while (pwm.pin != pin) {
         pwm = PinMap_PWM[++i];
     }
 
     // Find a free PT instance on this pin
-    while(pwm.pin == pin) {
+    while (pwm.pin == pin) {
 
         // Check to see if this PT instance is free
-        if((((mxc_pt_regs_t*)pwm.peripheral)->rate_length & 
-            MXC_F_PT_RATE_LENGTH_MODE)) {
+        if ((((mxc_pt_regs_t *)pwm.peripheral)->rate_length &
+                MXC_F_PT_RATE_LENGTH_MODE)) {
             break;
         }
 
@@ -78,10 +78,10 @@ void pwmout_init(pwmout_t* obj, PinName pin)
     MXC_CLKMAN->clk_ctrl_2_pt = MXC_E_CLKMAN_CLK_SCALE_ENABLED;
 
     // Set the obj pointer to the propper PWM instance
-    obj->pwm = (mxc_pt_regs_t*)pwm.peripheral;
+    obj->pwm = (mxc_pt_regs_t *)pwm.peripheral;
 
     // Initialize object period and pulse width
-    obj->period = -1; 
+    obj->period = -1;
     obj->pulse_width = -1;
 
     // Disable the output
@@ -94,17 +94,17 @@ void pwmout_init(pwmout_t* obj, PinName pin)
 
     // default to 20ms: standard for servos, and fine for e.g. brightness control
     pwmout_period_us(obj, 20000);
-    pwmout_write    (obj, 0);
+    pwmout_write(obj, 0);
 
     // Set the drive mode to normal
-    MXC_SET_FIELD(&MXC_GPIO->out_mode[port], (0x7 << (port_pin*4)), (MXC_V_GPIO_OUT_MODE_NORMAL_DRIVE << (port_pin*4)));
+    MXC_SET_FIELD(&MXC_GPIO->out_mode[port], (0x7 << (port_pin * 4)), (MXC_V_GPIO_OUT_MODE_NORMAL_DRIVE << (port_pin * 4)));
 
     // Enable the global pwm
     MXC_PTG->ctrl = MXC_F_PT_CTRL_ENABLE_ALL;
 }
 
 //******************************************************************************
-void pwmout_free(pwmout_t* obj)
+void pwmout_free(pwmout_t *obj)
 {
     // Set the registers to the reset value
     obj->pwm->train = 0;
@@ -112,39 +112,39 @@ void pwmout_free(pwmout_t* obj)
 }
 
 //******************************************************************************
-static void pwmout_update(pwmout_t* obj)
+static void pwmout_update(pwmout_t *obj)
 {
     // Calculate and set the divider ratio
-    int div = (obj->period * (SystemCoreClock/1000000))/32;
-    if (div < 2){
+    int div = (obj->period * (SystemCoreClock / 1000000)) / 32;
+    if (div < 2) {
         div = 2;
     }
     MXC_SET_FIELD(&obj->pwm->rate_length, MXC_F_PT_RATE_LENGTH_RATE_CONTROL, div);
 
     // Change the duty cycle to adjust the pulse width
-    obj->pwm->train = (0xFFFFFFFF << (32-((32*obj->pulse_width)/obj->period)));
+    obj->pwm->train = (0xFFFFFFFF << (32 - ((32 * obj->pulse_width) / obj->period)));
 }
 
 
 //******************************************************************************
-void pwmout_write(pwmout_t* obj, float percent)
+void pwmout_write(pwmout_t *obj, float percent)
 {
     // Saturate percent if outside of range
-    if(percent < 0.0) {
+    if (percent < 0.0) {
         percent = 0.0;
-    } else if(percent > 1.0) {
+    } else if (percent > 1.0) {
         percent = 1.0;
     }
 
     // Resize the pulse width to set the duty cycle
-    pwmout_pulsewidth_us(obj, (int)(percent*obj->period));
+    pwmout_pulsewidth_us(obj, (int)(percent * obj->period));
 }
 
 //******************************************************************************
-float pwmout_read(pwmout_t* obj)
+float pwmout_read(pwmout_t *obj)
 {
     // Check for when pulsewidth or period equals 0
-    if((obj->pulse_width == 0) || (obj->period == 0)){
+    if ((obj->pulse_width == 0) || (obj->period == 0)) {
         return 0;
     }
 
@@ -153,26 +153,26 @@ float pwmout_read(pwmout_t* obj)
 }
 
 //******************************************************************************
-void pwmout_period(pwmout_t* obj, float seconds)
+void pwmout_period(pwmout_t *obj, float seconds)
 {
     pwmout_period_us(obj, (int)(seconds * 1000000.0));
 }
 
 //******************************************************************************
-void pwmout_period_ms(pwmout_t* obj, int ms)
+void pwmout_period_ms(pwmout_t *obj, int ms)
 {
-    pwmout_period_us(obj, ms*1000);
+    pwmout_period_us(obj, ms * 1000);
 }
 
 //******************************************************************************
-void pwmout_period_us(pwmout_t* obj, int us)
+void pwmout_period_us(pwmout_t *obj, int us)
 {
     // Check the range of the period
-    MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
+    MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock / 32)));
 
     // Set pulse width to half the period if uninitialized
-    if(obj->pulse_width == -1){
-        obj->pulse_width = us/2;
+    if (obj->pulse_width == -1) {
+        obj->pulse_width = us / 2;
     }
 
     // Save the period
@@ -183,26 +183,32 @@ void pwmout_period_us(pwmout_t* obj, int us)
 }
 
 //******************************************************************************
-void pwmout_pulsewidth(pwmout_t* obj, float seconds)
+int pwmout_read_period_us(pwmout_t *obj)
+{
+    return obj->period;
+}
+
+//******************************************************************************
+void pwmout_pulsewidth(pwmout_t *obj, float seconds)
 {
     pwmout_pulsewidth_us(obj, (int)(seconds * 1000000.0));
 }
 
 //******************************************************************************
-void pwmout_pulsewidth_ms(pwmout_t* obj, int ms)
+void pwmout_pulsewidth_ms(pwmout_t *obj, int ms)
 {
-    pwmout_pulsewidth_us(obj, ms*1000);
+    pwmout_pulsewidth_us(obj, ms * 1000);
 }
 
 //******************************************************************************
-void pwmout_pulsewidth_us(pwmout_t* obj, int us)
+void pwmout_pulsewidth_us(pwmout_t *obj, int us)
 {
     // Check the range of the pulsewidth
-    MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock/32)));
+    MBED_ASSERT((us >= 0) && (us <= (int)(SystemCoreClock / 32)));
 
     // Initialize period to double the pulsewidth if uninitialized
-    if(obj->period == -1){
-        obj->period = 2*us;
+    if (obj->period == -1) {
+        obj->period = 2 * us;
     }
 
     // Save the pulsewidth
@@ -212,6 +218,12 @@ void pwmout_pulsewidth_us(pwmout_t* obj, int us)
     pwmout_update(obj);
 }
 
+//******************************************************************************
+int pwmout_read_pulsewidth_us(pwmout_t *obj)
+{
+    return obj->pulse_width;
+}
+
 const PinMap *pwmout_pinmap()
 {
     return PinMap_PWM;