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henryk
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/***************************************************************
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*
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* OpenBeacon.org - LED support
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*
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* Copyright 2007 Milosch Meriac <meriac@openbeacon.de>
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5b3bd67f
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henryk
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* Copyright 2008 Henryk Plötz <henryk@ploetzli.ch>
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633c646a
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henryk
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*
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***************************************************************
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <FreeRTOS.h>
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#include <AT91SAM7.h>
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#include <lib_AT91SAM7.h>
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#include <string.h>
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#include <board.h>
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#include <task.h>
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#include "led.h"
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#include "gammatable.inc"
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/**********************************************************************/
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#define BLINK_TIME 5
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#define PWM_PERIOD GAMMA_MAX
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const struct channel_definition {
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int channel_no;
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enum { PERIPH_NONE=0, PERIPH_A, PERIPH_B} periph;
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AT91PS_PWMC_CH channel;
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}
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pwm_channels[] = {
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[0] = {0, PERIPH_A, AT91C_BASE_PWMC_CH0},
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[1] = {1, PERIPH_A, AT91C_BASE_PWMC_CH1},
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[2] = {2, PERIPH_A, AT91C_BASE_PWMC_CH2},
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[7] = {3, PERIPH_B, AT91C_BASE_PWMC_CH3},
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[11] = {0, PERIPH_B, AT91C_BASE_PWMC_CH0},
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[12] = {1, PERIPH_B, AT91C_BASE_PWMC_CH1},
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[13] = {2, PERIPH_B, AT91C_BASE_PWMC_CH2},
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[14] = {3, PERIPH_B, AT91C_BASE_PWMC_CH3},
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[23] = {0, PERIPH_B, AT91C_BASE_PWMC_CH0},
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[24] = {1, PERIPH_B, AT91C_BASE_PWMC_CH1},
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[25] = {2, PERIPH_B, AT91C_BASE_PWMC_CH2},
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};
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static const struct channel_definition* find_channel(unsigned int led)
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{
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unsigned int pos = ffs(led);
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if(pos==0) return 0;
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if(pos-1 >= sizeof(pwm_channels) / sizeof(pwm_channels[0]) ) return 0;
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if(pwm_channels[pos-1].periph == PERIPH_NONE) return 0;
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return &pwm_channels[pos-1];
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}
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// Brightness is in per thousand
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void vLedSetBrightness(unsigned int led, int brightness)
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{
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const struct channel_definition *c = find_channel(led);
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if(c==0) return;
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if(brightness < 0) brightness = 0;
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if(brightness > GAMMA_LEN-1) brightness = GAMMA_LEN-1;
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int duty = gammatable[brightness];
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if(duty > 1) {
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c->channel->PWMC_CUPDR = duty;
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if(c->periph == PERIPH_A) {
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
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} else if(c->periph == PERIPH_B) {
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
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}
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} else {
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vLedSet(led, 0);
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}
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}
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void vLedSet(int led, bool_t on)
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{
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if(on)
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AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, led );
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else
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AT91F_PIO_SetOutput( AT91C_BASE_PIOA, led );
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AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, led );
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}
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void vLedBlink(int led)
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{
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volatile int i=0;
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vLedSet(led, 1);
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for(i=0; i<BLINK_TIME; i++) {vLedSet(led,0);vLedSet(led,1);}
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vLedSet(led, 0);
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}
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/**********************************************************************/
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void vLedSetRed(bool_t on)
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{
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vLedSet(LED_RED, on);
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}
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void vLedBlinkRed(void)
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{
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vLedBlink(LED_RED);
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}
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/**********************************************************************/
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void vLedSetGreen(bool_t on)
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{
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vLedSet(LED_GREEN, on);
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}
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/**********************************************************************/
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void vLedBlinkGreen(void)
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{
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vLedBlink(LED_GREEN);
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}
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/**********************************************************************/
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void vLedHaltBlinking(int reason)
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{
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volatile u_int32_t i=0;
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while(1)
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{
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AT91F_PIO_ClearOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
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for(i=0; i<MCK/40; i++) ;
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switch(reason) {
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case 1:
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vLedSetGreen(1);
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vLedSetRed(0);
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break;
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case 2:
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vLedSetGreen(0);
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vLedSetRed(1);
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break;
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case 3:
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vLedSetGreen(1);
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vLedSetRed(1);
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break;
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case 0:
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default:
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vLedSetGreen(0);
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vLedSetRed(0);
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break;
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}
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for(i=0; i<MCK/20; i++) ;
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AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
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for(i=0; i<MCK/40; i++) ;
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}
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}
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/**********************************************************************/
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static void init_led_pwm(unsigned int led)
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{
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const struct channel_definition *c = find_channel(led);
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if(c==0) return;
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// Set PIO mapping
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if(c->periph == PERIPH_A) {
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, led, 0);
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} else if(c->periph == PERIPH_B) {
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AT91F_PIO_CfgPeriph(AT91C_BASE_PIOA, 0, led);
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} else
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return;
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// Configure channel: clock = MCK, period = PWM_PERIOD, CPOL=1, duty cycle variable
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c->channel->PWMC_CMR = 0x0 | AT91C_PWMC_CPOL;
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c->channel->PWMC_CDTYR = 1;
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c->channel->PWMC_CPRDR = PWM_PERIOD;
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AT91C_BASE_PWMC->PWMC_ENA = (1<<(c->channel_no));
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vLedSetBrightness(led, 0);
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}
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void vLedInit(void)
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{
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// turn off LED's
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AT91F_PIO_CfgOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
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AT91F_PIO_SetOutput( AT91C_BASE_PIOA, LED_RED | LED_GREEN );
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AT91F_PMC_EnablePeriphClock(AT91C_BASE_PMC,
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((unsigned int) 1 << AT91C_ID_PWMC));
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init_led_pwm(LED_GREEN);
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init_led_pwm(LED_RED);
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}
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