Content originally posted in LPCWare by audriusmerfeldas on Sat Jan 16 16:33:14 MST 2016 Hi there, I am trying to get 3 different PWM signals from the same timer, but there is a problem with timer match register 3. I am getting high level on Port2_8. Both mat0 and mat1 work perfer=ct
#include "LPC11xx.h" /* LPC11xx definitions */
#include "gpio.h"
#include <cr_section_macros.h>
#include <NXP/crp.h>
// Variable to store CRP value in. Will be placed automatically
// by the linker when "Enable Code Read Protect" selected.
// See crp.h header for more information
__CRP const unsigned int CRP_WORD = CRP_NO_CRP ;
int main(void)
{
LPC_TMR32B0->TCR = 0; //Disable Timer0
LPC_SYSCON->SYSAHBCLKCTRL |= (1<<9); // System AHB clock control enable clock to timer32 0
LPC_TMR32B0->EMR = (1<<0)|(1<<1)|(1<<2)|(1<<3)|(1<<5)|(1<<7)|(1<<8)|(1<<11); // Setup the external match register (1<<0 : EM0 connected to pin) : 18.7.10 External Match Register
// 1<<5 : Set the corresponding External Match bit/output to 1
// 1<<10 : Clear the corresponding External Match bit/output to 0 (CT16Bn_MATm pin is LOW if pinned out : (1<<3).
LPC_IOCON->PIO1_6 &= ~0x07; // Clears the FUNC bits : 8.4.23 IOCON_PIO1_6
LPC_IOCON->PIO1_6 |= 0x02; // Selects function CT32B0_MAT0. PIO1_6
LPC_IOCON->PIO1_7 &= ~0x07; // Clears the FUNC bits : 8.4.24 IOCON_PIO1_7
LPC_IOCON->PIO1_7 |= 0x02; // Selects function CT32B0_MAT1. PIO1_7
LPC_IOCON->PIO2_8 &= ~0x07; // Clears the FUNC bits : 8.4.24 IOCON_PIO1_7
LPC_IOCON->PIO2_8 |= 0x02; // Selects function CT32B0_MAT1. PIO1_7
// These are compared against the TC ( Timer Counter )
LPC_TMR32B0->MR2 = 1000-1; // Setup the match registers
LPC_TMR32B0->MR0 = 500; // Match Register 0 - PWM1 value
LPC_TMR32B0->MR1 = 500; //PWM2 value
LPC_TMR32B0->MR3 = 500; //PWM3 value
LPC_TMR32B0->MCR = 1<<7; // OK : Match Control Register : 1<<7 = Reset on MR2
// If needed : 1<<9 = Interrupt on MR3: an interrupt is generated when MR3 matches the value in the TC.
LPC_TMR32B0->PWMC = 0b1111; // OK : PWM Control Register to enable the selected PWMs
// 0x01 : PWM mode is enabled for CT32Bn_MAT0
// 0x02 : PWM mode is enabled for CT32Bn_MAT1
// 0x04 : PWM mode is enabled for CT32Bn_MAT2
// 0x08 : PWM mode is enabled for match channel 3
NVIC_EnableIRQ(TIMER_32_0_IRQn); // Enable the TIMER1 Interrupt
LPC_TMR32B0->TCR = 1; // Enable Timer16
while(1)
{
}
}
Content originally posted in LPCWare by audriusmerfeldas on Sun Jan 17 02:50:28 MST 2016 Waw thanks a lot mate. Havent noticed that for this pin I need to set 0x1. You have saved the day. Thanks
Content originally posted in LPCWare by R2D2 on Sat Jan 16 17:21:09 MST 2016 Quote: audriusmerfeldas ...but there is a problem with timer match register 3. I am getting high level on Port2_8.
:quest:
Then use LPC_IOCON->PIO2_8 setup for CT32B0_MAT3 :O
