pwm register macros

// all values are in timer clock cycles of the respective peripheral.
// eCAP 0-2 run at 100 MHz, i.e. pwm values are in units of 10ns
// PRUSS eCAP runs at 200 MHz, i.e. pwm values are in units of 5ns
// ePWM 0-2 run at 100 MHz / prescale divider, configurable per peripheral.
//
// using these macros assumes the corresponding peripheral has already been
// setup as pwm output in advance (from python)

// macros to get/set the pwm values (in range 0 .. period)
#define EPWM0A  ( *(uint16_t volatile *)0x48300212 )
#define EPWM0B  ( *(uint16_t volatile *)0x48300214 )
#define EPWM1A  ( *(uint16_t volatile *)0x48302212 )
#define EPWM1B  ( *(uint16_t volatile *)0x48302214 )
#define EPWM2A  ( *(uint16_t volatile *)0x48304212 )
#define EPWM2B  ( *(uint16_t volatile *)0x48304214 )
#define ECAP0_PWM  ( *(uint32_t volatile *)0x48300114 )
#define ECAP1_PWM  ( *(uint32_t volatile *)0x48302114 )
#define ECAP2_PWM  ( *(uint32_t volatile *)0x48304114 )

// macros to get the pwm periods.
// caution: if an eCAP has been configured to a period of 2**32 cycles then
// this macro will yield 0 instead.
#define EPWM0_PERIOD  ( *(uint16_t const *)0x4830020a + 1 )
#define EPWM1_PERIOD  ( *(uint16_t const *)0x4830220a + 1 )
#define EPWM2_PERIOD  ( *(uint16_t const *)0x4830420a + 1 )
#define ECAP0_PWM_PERIOD  ( *(uint32_t const *)0x48300110 + 1 )
#define ECAP1_PWM_PERIOD  ( *(uint32_t const *)0x48302110 + 1 )
#define ECAP2_PWM_PERIOD  ( *(uint32_t const *)0x48304110 + 1 )