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Merge pull request #4029 from ks156/pwm

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cpu/lpc11u34 : Peripheral addition : PWM
This commit is contained in:
Thomas Eichinger 2015-10-08 17:00:52 +02:00
commit 89c0f42b00
3 changed files with 269 additions and 6 deletions
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1
boards/weio/Makefile.features
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@ -2,4 +2,5 @@ FEATURES_PROVIDED += cpp
FEATURES_PROVIDED += periph_uart
FEATURES_PROVIDED += periph_timer
FEATURES_PROVIDED += periph_gpio
FEATURES_PROVIDED += periph_pwm
FEATURES_MCU_GROUP = cortex_m0

56
boards/weio/include/periph_conf.h
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@ -33,15 +33,15 @@ extern "C" {
#define TIMER_IRQ_PRIO 1
/* Timer 0 configuration */
#define TIMER_0_DEV LPC_CT32B0
#define TIMER_0_DEV LPC_CT32B1
#define TIMER_0_CHANNELS 4
#define TIMER_0_PRESCALER (48U)
#define TIMER_0_MAX_VALUE (0xffffffff)
#define TIMER_0_CLKEN() (LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 9))
#define TIMER_0_CLKDIS() (LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 9))
#define TIMER_0_ISR isr_ct32b0
#define TIMER_0_IRQ TIMER_32_0_IRQn
/** @} */
#define TIMER_0_CLKEN() (LPC_SYSCON->SYSAHBCLKCTRL |= (1 << 10))
#define TIMER_0_CLKDIS() (LPC_SYSCON->SYSAHBCLKCTRL &= ~(1 << 10))
#define TIMER_0_ISR isr_ct32b1
#define TIMER_0_IRQ TIMER_32_1_IRQn
/* @} */
/**
* @brief UART configuration
@ -206,6 +206,50 @@ extern "C" {
#define GPIO_31_PIN 23
/** @} */
/**
* @brief PWM configuration
* @{
*/
#define PWM_0_EN 1
#define PWM_0_CHANNELS 3
#define PWM_1_EN 1
#define PWM_1_CHANNELS 3
#define PWM_NUMOF (2U)
/* PWM0 common configuration */
#define PWM_0_DEV LPC_CT16B0
#define PWM_0_CLK BIT7
/* PWM_0 channel configuration */
#define PWM_0_CH0_EN 1
#define PWM_0_CH0_IOCON LPC_IOCON->PIO1_13
#define PWM_0_CH0_AF 0x82
#define PWM_0_CH1_EN 1
#define PWM_0_CH1_IOCON LPC_IOCON->PIO1_14
#define PWM_0_CH1_AF 0x82
#define PWM_0_CH2_EN 1
#define PWM_0_CH2_IOCON LPC_IOCON->PIO1_15
#define PWM_0_CH2_AF 0x82
/* PWM1 common configuration */
#define PWM_1_DEV LPC_CT32B0
#define PWM_1_CLK BIT9
/* PWM_1 channel configuration */
#define PWM_1_CH0_EN 1
#define PWM_1_CH0_IOCON LPC_IOCON->PIO1_24
#define PWM_1_CH0_AF 0x81
#define PWM_1_CH1_EN 1
#define PWM_1_CH1_IOCON LPC_IOCON->PIO1_25
#define PWM_1_CH1_AF 0x81
#define PWM_1_CH2_EN 1
#define PWM_1_CH2_IOCON LPC_IOCON->PIO1_26
#define PWM_1_CH2_AF 0x81
/* @} */
#ifdef __cplusplus
}
#endif

218
cpu/lpc11u34/periph/pwm.c Normal file
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@ -0,0 +1,218 @@
/*
* Copyright (C) 2015 Freie Universität Berlin
*
* This file is subject to the terms and conditions of the GNU Lesser General
* Public License v2.1. See the file LICENSE in the top level directory for more
* details.
*/
/**
* @ingroup lpc11u34
* @{
*
* @file
* @brief CPU specific low-level PWM driver implementation for LPC11U34
*
* @author Paul RATHGEB <paul.rathgeb@skynet.be>
*
* @}
*/
#include "bitarithm.h"
#include "periph/gpio.h"
#include "periph/pwm.h"
#include "board.h"
#include "periph_conf.h"
/* guard file in case no PWM device is defined */
#if (PWM_0_EN || PWM_1_EN)
/**
* @note The LPC11U34 doesn't support centerized alignements
*/
int pwm_init(pwm_t dev, pwm_mode_t mode, unsigned int frequency, unsigned int resolution)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
/* This CPU doesn't support a centerized alignement */
if (mode == PWM_CENTER) {
return -1;
}
/* Check if the frequency and resolution is applicable */
if (F_CPU/(resolution*frequency) <= 0) {
return -2;
}
#if PWM_0_CH0_EN
PWM_0_CH0_IOCON = (PWM_0_CH0_IOCON & ~(BIT7 | 7)) | PWM_0_CH0_AF;
#endif
#if PWM_0_CH1_EN
PWM_0_CH1_IOCON = (PWM_0_CH1_IOCON & ~(BIT7 | 7)) | PWM_0_CH1_AF;
#endif
#if PWM_0_CH2_EN
PWM_0_CH2_IOCON = (PWM_0_CH2_IOCON & ~(BIT7 | 7)) | PWM_0_CH2_AF;
#endif
/* The configuration involve that the peripheral is powered */
pwm_poweron(dev);
/* Enable timer and keep it in reset state */
PWM_0_DEV->TCR = BIT0 | BIT1;
/* Set the prescaler (F_CPU / resolution) */
PWM_0_DEV->PR = (F_CPU/(resolution*frequency));
/* Reset timer on MR3 */
PWM_0_DEV->MCR = BIT10;
/* Set PWM period */
PWM_0_DEV->MR0 = (resolution);
PWM_0_DEV->MR1 = (resolution);
PWM_0_DEV->MR2 = (resolution);
PWM_0_DEV->MR3 = (resolution)-1;
/* Set mode for channels 0..2 */
PWM_0_DEV->EMR |= ((mode+1) << 4);
PWM_0_DEV->EMR |= ((mode+1) << 6);
PWM_0_DEV->EMR |= ((mode+1) << 8);
/* Enable PWM channels 0..2 */
PWM_0_DEV->PWMC = BIT0 | BIT1 | BIT2;
#endif /* PWM_0_EN */
#if PWM_1_EN
case PWM_1:
/* This CPU doesn't support a centerized alignement */
if (mode == PWM_CENTER) {
return -1;
}
/* Check if the frequency and resolution is applicable */
if (F_CPU/(resolution*frequency) <= 0) {
return -2;
}
#if PWM_1_CH0_EN
PWM_1_CH0_IOCON = (PWM_1_CH0_IOCON & ~(BIT7 | 7)) | PWM_1_CH0_AF;
#endif
#if PWM_1_CH1_EN
PWM_1_CH1_IOCON = (PWM_1_CH1_IOCON & ~(BIT7 | 7)) | PWM_1_CH1_AF;
#endif
#if PWM_1_CH2_EN
PWM_1_CH2_IOCON = (PWM_1_CH2_IOCON & ~(BIT7 | 7)) | PWM_1_CH2_AF;
#endif
/* The configuration involve that the peripheral is powered */
pwm_poweron(dev);
/* Enable timer and keep it in reset state */
PWM_1_DEV->TCR = BIT0 | BIT1;
/* Set the prescaler (F_CPU / resolution) */
PWM_1_DEV->PR = (F_CPU/(resolution*frequency));
/* Reset timer on MR3 */
PWM_1_DEV->MCR = BIT10;
/* Set PWM period */
PWM_1_DEV->MR0 = (resolution);
PWM_1_DEV->MR1 = (resolution);
PWM_1_DEV->MR2 = (resolution);
PWM_1_DEV->MR3 = (resolution)-1;
/* Set mode for channels 0..2 */
PWM_1_DEV->EMR |= ((mode+1) << 4);
PWM_1_DEV->EMR |= ((mode+1) << 6);
PWM_1_DEV->EMR |= ((mode+1) << 8);
/* Enable PWM channels 0..2 */
PWM_1_DEV->PWMC = BIT0 | BIT1 | BIT2;
#endif /* PWM_1_EN */
}
return frequency;
}
int pwm_set(pwm_t dev, int channel, unsigned int value)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
if (channel <= 2) {
PWM_0_DEV->MR[channel] = PWM_0_DEV->MR3 - value;
}
break;
#endif
#if PWM_1_EN
case PWM_1:
if (channel <= 2) {
PWM_1_DEV->MR[channel] = PWM_1_DEV->MR3 - value;
}
break;
#endif
}
return 0;
}
void pwm_start(pwm_t dev)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
/* Start the counter */
PWM_0_DEV->TCR &= ~BIT1;
break;
#endif
#if PWM_1_EN
case PWM_1:
/* Start the counter */
PWM_1_DEV->TCR &= ~BIT1;
break;
#endif
}
}
void pwm_stop(pwm_t dev)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
/* Stop the counter */
PWM_0_DEV->TCR |= BIT1;
break;
#endif
#if PWM_1_EN
case PWM_1:
/* Stop the counter */
PWM_1_DEV->TCR |= BIT1;
break;
#endif
}
}
void pwm_poweron(pwm_t dev)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
/* Enable clock for PWM_0 */
LPC_SYSCON->SYSAHBCLKCTRL |= PWM_0_CLK;
break;
#endif
#if PWM_1_EN
case PWM_1:
/* Enable clock for PWM_1 */
LPC_SYSCON->SYSAHBCLKCTRL |= PWM_1_CLK;
break;
#endif
}
}
void pwm_poweroff(pwm_t dev)
{
switch (dev) {
#if PWM_0_EN
case PWM_0:
/* Disable clock for PWM_0 */
LPC_SYSCON->SYSAHBCLKCTRL &= ~PWM_0_CLK;
break;
#endif
#if PWM_1_EN
case PWM_1:
/* Disable clock for PWM_1 */
LPC_SYSCON->SYSAHBCLKCTRL &= ~PWM_1_CLK;
break;
#endif
}
}
#endif /* (PWM_0_EN || PWM_1_EN) */