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/***************************************************************
*
* OpenBeacon.org - LED support
*
* Copyright 2007 Milosch Meriac <meriac@openbeacon.de>
* Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
*
***************************************************************
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <FreeRTOS.h>
#include <AT91SAM7.h>
#include <lib_AT91SAM7.h>
#include <string.h>
#include <board.h>
#include <task.h>
#include "led.h"
#include "gammatable.inc"
/**********************************************************************/
#define BLINK_TIME 5
#define PWM_PERIOD GAMMA_MAX
const struct channel_definition {
int channel_no;
enum { PERIPH_NONE=0, PERIPH_A, PERIPH_B} periph;
AT91PS_PWMC_CH channel;
}
pwm_channels[] = {
[0] = {0, PERIPH_A, AT91C_BASE_PWMC_CH0},
[1] = {1, PERIPH_A, AT91C_BASE_PWMC_CH1},
[2] = {2, PERIPH_A, AT91C_BASE_PWMC_CH2},
[7] = {3, PERIPH_B, AT91C_BASE_PWMC_CH3},
[11] = {0, PERIPH_B, AT91C_BASE_PWMC_CH0},
[12] = {1, PERIPH_B, AT91C_BASE_PWMC_CH1},
[13] = {2, PERIPH_B, AT91C_BASE_PWMC_CH2},
[14] = {3, PERIPH_B, AT91C_BASE_PWMC_CH3},
[23] = {0, PERIPH_B, AT91C_BASE_PWMC_CH0},
[24] = {1, PERIPH_B, AT91C_BASE_PWMC_CH1},
[25] = {2, PERIPH_B, AT91C_BASE_PWMC_CH2},
};
static const struct channel_definition* find_channel(unsigned int led)
{
unsigned int pos = ffs(led);
if(pos==0) return 0;
if(pos-1 >= sizeof(pwm_channels) / sizeof(pwm_channels[0]) ) return 0;
if(pwm_channels[pos-1].periph == PERIPH_NONE) return 0;
return &pwm_channels[pos-1];
}
// Brightness is in per thousand
void vLedSetBrightness(unsigned int led, int brightness)
{
const struct channel_definition *c = find_channel(led);
if(c==0) return;
if(brightness < 0) brightness = 0;
if(brightness > GAMMA_LEN-1) brightness = GAMMA_LEN-1;
int duty = gammatable[brightness];
if(duty > 1) {
c->channel->PWMC_CUPDR = duty;
if(c->periph == PERIPH_A) {
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
} else if(c->periph == PERIPH_B) {
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
}
} else {
vLedSet(led, 0);
}
}
void vLedSet(int led, bool_t on)
{
if(on)
AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, led );
else
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, led );
AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, led );
}
void vLedBlink(int led)
{
volatile int i=0;
vLedSet(led, 1);
for(i=0; i<BLINK_TIME; i++) {vLedSet(led,0);vLedSet(led,1);}
vLedSet(led, 0);
}
/**********************************************************************/
void vLedSetRed(bool_t on)
{
vLedSet(LED_RED, on);
}
void vLedBlinkRed(void)
{
vLedBlink(LED_RED);
}
/**********************************************************************/
void vLedSetGreen(bool_t on)
{
vLedSet(LED_GREEN, on);
}
/**********************************************************************/
void vLedBlinkGreen(void)
{
vLedBlink(LED_GREEN);
}
/**********************************************************************/
void vLedHaltBlinking(int reason)
{
volatile u_int32_t i=0;
while(1)
{
AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
for(i=0; i<MCK/40; i++) ;
switch(reason) {
case 1:
vLedSetGreen(1);
vLedSetRed(0);
break;
case 2:
vLedSetGreen(0);
vLedSetRed(1);
break;
case 3:
vLedSetGreen(1);
vLedSetRed(1);
break;
case 0:
default:
vLedSetGreen(0);
vLedSetRed(0);
break;
}
for(i=0; i<MCK/20; i++) ;
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
for(i=0; i<MCK/40; i++) ;
}
}
/**********************************************************************/
static void init_led_pwm(unsigned int led)
{
const struct channel_definition *c = find_channel(led);
if(c==0) return;
// Set PIO mapping
if(c->periph == PERIPH_A) {
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
} else if(c->periph == PERIPH_B) {
AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
} else
return;
// Configure channel: clock = MCK, period = PWM_PERIOD, CPOL=1, duty cycle variable
c->channel->PWMC_CMR = 0x0 | AT91C_PWMC_CPOL;
c->channel->PWMC_CDTYR = 1;
c->channel->PWMC_CPRDR = PWM_PERIOD;
AT91C_BASE_PWMC->PWMC_ENA = (1<<(c->channel_no));
vLedSetBrightness(led, 0);
}
void vLedInit(void)
{
// turn off LED's
AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC,
((unsigned int) 1 << AT91C_ID_PWMC));
init_led_pwm(LED_GREEN);
init_led_pwm(LED_RED);
}
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