FastPWM
Fork of FastPWM by
Diff: Device/FastPWM_LPC_SCT.cpp
- Revision:
- 29:3e4d3b900850
- Child:
- 30:87e38b846651
diff -r 3c8a0d977bc3 -r 3e4d3b900850 Device/FastPWM_LPC_SCT.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/Device/FastPWM_LPC_SCT.cpp Sun Mar 13 11:43:18 2016 +0000 @@ -0,0 +1,55 @@ +//For targets which use the SCT +#if defined(TARGET_LPC81X) || defined(TARGET_LPC82X) + +#ifdef TARGET_LPC82X +#define CTRL_U CTRL +#endif + +#include "FastPWM.h" + +void FastPWM::initFastPWM( void ) { + //Mbed uses the timer as a single unified 32-bit timer, who are we to argue with this, and it is easier + bits = 32; + + //With 32-bit we fix prescaler to 1 + _pwm.pwm->CTRL_U |= (1 << 2) | (1 << 3); + _pwm.pwm->CTRL_U &= ~(0x7F << 5); + _pwm.pwm->CTRL_U &= ~(1 << 2); + +} + +void FastPWM::pulsewidth_ticks( uint32_t ticks ) { + #ifdef TARGET_LPC81X + _pwm.pwm->MATCHREL[_pwm.pwm_ch + 1].U = ticks; + #else + _pwm.pwm->MATCHREL[_pwm.pwm_ch + 1] = ticks; + #endif +} + +void FastPWM::period_ticks( uint32_t ticks ) { + #ifdef TARGET_LPC81X + _pwm.pwm->MATCHREL[0].U = ticks; + #else + _pwm.pwm->MATCHREL[0] = ticks; + #endif +} + +uint32_t FastPWM::getPeriod( void ) { + #ifdef TARGET_LPC81X + return _pwm.pwm->MATCHREL[0].U; + #else + return _pwm.pwm->MATCHREL[0]; + #endif +} + +//Maybe implemented later, but needing to change the prescaler for a 32-bit +//timer used in PWM mode is kinda unlikely. +//If you really need to do it, rejoice, you can make it run so slow a period is over 40,000 year +uint32_t FastPWM::setPrescaler(uint32_t reqScale) { + //Disable dynamic prescaling + dynamicPrescaler = false; + + return 1; +} + +#endif \ No newline at end of file