sct_trafficlight.c

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/*
 * @brief State Configurable Timer Traffic Lights example
 *
 * @note
 * Copyright(C) NXP Semiconductors, 2012
 * All rights reserved.
 *
 * @par
 * Software that is described herein is for illustrative purposes only
 * which provides customers with programming information regarding the
 * LPC products.  This software is supplied "AS IS" without any warranties of
 * any kind, and NXP Semiconductors and its licensor disclaim any and
 * all warranties, express or implied, including all implied warranties of
 * merchantability, fitness for a particular purpose and non-infringement of
 * intellectual property rights.  NXP Semiconductors assumes no responsibility
 * or liability for the use of the software, conveys no license or rights under any
 * patent, copyright, mask work right, or any other intellectual property rights in
 * or to any products. NXP Semiconductors reserves the right to make changes
 * in the software without notification. NXP Semiconductors also makes no
 * representation or warranty that such application will be suitable for the
 * specified use without further testing or modification.
 *
 * @par
 * Permission to use, copy, modify, and distribute this software and its
 * documentation is hereby granted, under NXP Semiconductors' and its
 * licensor's relevant copyrights in the software, without fee, provided that it
 * is used in conjunction with NXP Semiconductors microcontrollers.  This
 * copyright, permission, and disclaimer notice must appear in all copies of
 * this code.
 */

#include <stdlib.h>
#include <string.h>
#include "board.h"
#include "sct_fsm.h"

/*****************************************************************************
 * Private types/enumerations/variables
 ****************************************************************************/
#ifdef BOARD_HITEX_EVA_18504350
#define MCSEL_BIT           23
#define MCSEL_PORT          6
#endif

static uint16_t delay;

/*****************************************************************************
 * Public types/enumerations/variables
 ****************************************************************************/

/*****************************************************************************
 * Private functions
 ****************************************************************************/

/* Initialise the SCT Pins */
void SCT_PinsConfigure(void)
{
#ifdef BOARD_HITEX_EVA_18504350
 /* Enable signals on MC connector X19 */
 Chip_SCU_PinMuxSet(0xD, 9, (SCU_MODE_MODE_INACT | SCU_MODE_FUNC4));  /* PD_9:  GPIO 6.23, MCSEL */
 Chip_GPIO_WriteDirBit(LPC_GPIO_PORT, MCSEL_PORT, MCSEL_BIT, true);
 Chip_GPIO_WritePortBit(LPC_GPIO_PORT, MCSEL_PORT, MCSEL_BIT, false);

 /* Pin configuration for SCT */
 /* PD_7:  SCTIN_5 used for the CROSS_REQUEST input (button) */
 Chip_SCU_PinMuxSet(0xD, 7, (SCU_MODE_MODE_REPEATER | SCU_MODE_INBUFF_EN | SCU_MODE_FUNC1));

 /* PD_10:  SCTIN_1, used for SCT clock input */
 /* Connect JP13 pin 1 with connector X19  pin2 */
 Chip_SCU_PinMuxSet(0xD, 10, (SCU_MODE_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_HIGHSPEEDSLEW_EN | SCU_MODE_FUNC1));

 Chip_SCU_PinMuxSet(0xE, 6, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC1)); /* PE_6:  SCTOUT_2 connected to RGB green */
 Chip_SCU_PinMuxSet(0xE, 5, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC1)); /* PE_5:  SCTOUT_3 connected to RGB red */
 Chip_SCU_PinMuxSet(0xE, 8, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC1)); /* P4_4:  SCTOUT_4 connected to RGB blue */
 Chip_SCU_PinMuxSet(0xE, 7, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC1)); /* P4_3:  SCTOUT_5 */
 Chip_SCU_PinMuxSet(0xD, 3, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC1)); /* PD_3:  SCTOUT_6 */

 /* Global configuration of the SCT */
 /* use external clock, rising edge, on CTIN1 */
 /* For Hitex4350, external clock is IRC clock /16 = 12 MHz / 16 = 750 KHz */
 /* For Hitex1850, external clock is IRC clock /16 = 12 MHz / 16 = 750 KHz */
 Chip_SCT_Config(LPC_SCT, (SCT_CONFIG_16BIT_COUNTER | (0x2 << 1) | (0x2 << 3)));

#elif defined(BOARD_KEIL_MCB_18574357)

 /* PD_10:  SCTIN_2, used for SCT clock input */
 /* Connect PF_8 pin to CLK3 */
 Chip_SCU_PinMuxSet(0xF, 8, (SCU_MODE_MODE_INACT | SCU_MODE_INBUFF_EN | SCU_MODE_HIGHSPEEDSLEW_EN | SCU_MODE_FUNC2));

 Chip_SCU_PinMuxSet(0xD, 11, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC6)); /* PD_11:  SCTOUT_14 connected to LED1 */
 Chip_SCU_PinMuxSet(0xD, 12, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC6)); /* PD_12:  SCTOUT_10 connected to LED2 */
 Chip_SCU_PinMuxSet(0xD, 13, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC6)); /* PD_13:  SCTOUT_13 connected to LED3 */
 Chip_SCU_PinMuxSet(0xD, 14, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC6)); /* PD_14:  SCTOUT_11 connected to LED4 */
 Chip_SCU_PinMuxSet(0xD, 15, (SCU_MODE_MODE_PULLUP | SCU_MODE_FUNC6)); /* PD_15:  SCTOUT_8 connected to LED5 */

 /* Global configuration of the SCT */
 /* use external clock, rising edge, on CTIN2 */
 /* For Keil4357, external clock is IRC clock /16 = 12 MHz / 16 = 750 KHz */
 /* For Keil1857, external clock is IRC clock /16 = 12 MHz / 16 = 750 KHz */
 Chip_SCT_Config(LPC_SCT, (SCT_CONFIG_16BIT_COUNTER | (0x2 << 1) | (0x4 << 3)));

#else
#error Board not supported!
#endif

}

/*****************************************************************************
 * Public functions
 ****************************************************************************/

void SCT_IRQHandler(void)
{
 /* Acknowledge the interrupt source */
 if (LPC_SCT->EVFLAG & (1 << SCT_IRQ_EVENT_crossingTimeout)) {

  LPC_SCT->EVFLAG |= (1 << SCT_IRQ_EVENT_crossingTimeout);

  /* determine the captured RPM measurement */
  delay = (rand() % 22 + 1) * 2929;
  reload_cross_timeout(delay);
 }
}

int main(void)
{
 uint32_t SCT_FRQ;

 Board_Init();

 /* Initialize SCT */
 Chip_SCT_Init(LPC_SCT);

 LPC_SCU->SFSCLK[3] = SCU_MODE_MODE_REPEATER | SCU_MODE_FUNC1; /* function 1; CGU clk out, pull up */

 /* Attach IRC clock to divider B with a divider of 16 */
 Chip_Clock_SetDivider(CLK_IDIV_B, CLKIN_IRC, 16);

 /* Route divider B output to Clock output base clock and enable base out clock */
 Chip_Clock_SetBaseClock(CLK_BASE_OUT, CLKIN_IDIVB, true, false);

 /* Configure SCT pins */
 SCT_PinsConfigure();

 SCT_FRQ = Chip_Clock_GetRate(CLK_MX_SCT);
 DEBUGOUT("SCT_FRQ: %d\r\n", SCT_FRQ);

 Chip_SCT_ControlSetClr(LPC_SCT, SCT_CTRL_CLRCTR_L | SCT_CTRL_HALT_L | SCT_CTRL_PRE_L(256 - 1)
         | SCT_CTRL_HALT_H | SCT_CTRL_CLRCTR_H | SCT_CTRL_PRE_H(256 - 1),
         ENABLE);

 /* Now use the FSM code to configure the state machine */
 sct_fsm_init();

 /* initialize random seed: */
 srand(0x5EED);

 /*  12000000 / 256 / 16 = 2929 Hz
  * 65535 / 2929 =~ 22 */
 /* generate a random delay from 1 to 22 seconds */
 delay = (rand() % 22 + 1) * 2929;

 NVIC_ClearPendingIRQ(SCT_IRQn);
 NVIC_EnableIRQ(SCT_IRQn);

 /* Start the SCT */
 Chip_SCT_ControlSetClr(LPC_SCT, SCT_CTRL_STOP_L | SCT_CTRL_HALT_L | SCT_CTRL_STOP_H | SCT_CTRL_HALT_H, DISABLE);

 while (1) {
  __WFI();
 }
}