pwm_single_edge.c

00001 /***********************************************************************//**
00002  * @file        pwm_single_edge.c
00003  * @purpose     This program illustrates the PWM signal on 6 Channels
00004  *              in single edge mode
00005  * @version     2.0
00006  * @date        21. May. 2010
00007  * @author      NXP MCU SW Application Team
00008  *---------------------------------------------------------------------
00009  * Software that is described herein is for illustrative purposes only
00010  * which provides customers with programming information regarding the
00011  * products. This software is supplied "AS IS" without any warranties.
00012  * NXP Semiconductors assumes no responsibility or liability for the
00013  * use of the software, conveys no license or title under any patent,
00014  * copyright, or mask work right to the product. NXP Semiconductors
00015  * reserves the right to make changes in the software without
00016  * notification. NXP Semiconductors also make no representation or
00017  * warranty that such application will be suitable for the specified
00018  * use without further testing or modification.
00019  **********************************************************************/
00020 #include "lpc17xx_pwm.h"
00021 #include "lpc17xx_libcfg.h"
00022 #include "lpc17xx_pinsel.h"
00023 
00024 /* Example group ----------------------------------------------------------- */
00025 /** @defgroup PWM_Single_Edge   Single_Edge
00026  * @ingroup PWM_Examples
00027  * @{
00028  */
00029 
00030 /*-------------------------MAIN FUNCTION------------------------------*/
00031 /*********************************************************************//**
00032  * @brief       c_entry: Main PWM program body
00033  * @param[in]   None
00034  * @return      int
00035  **********************************************************************/
00036 int c_entry(void)
00037 {
00038     uint8_t temp, temp2;
00039     PWM_TIMERCFG_Type PWMCfgDat;
00040     PWM_MATCHCFG_Type PWMMatchCfgDat;
00041     PINSEL_CFG_Type PinCfg;
00042 
00043     /* PWM block section -------------------------------------------- */
00044     /* Initialize PWM peripheral, timer mode
00045      * PWM prescale value = 1 (absolute value - tick value) */
00046     PWMCfgDat.PrescaleOption = PWM_TIMER_PRESCALE_TICKVAL;
00047     PWMCfgDat.PrescaleValue = 1;
00048     PWM_Init(LPC_PWM1, PWM_MODE_TIMER, (void *) &PWMCfgDat);
00049 
00050     /*
00051      * Initialize PWM pin connect
00052      */
00053     PinCfg.Funcnum = 1;
00054     PinCfg.OpenDrain = 0;
00055     PinCfg.Pinmode = 0;
00056     PinCfg.Portnum = 2;
00057     for (temp = 0; temp <= 6; temp++){
00058         PinCfg.Pinnum = temp;
00059         PINSEL_ConfigPin(&PinCfg);
00060     }
00061 
00062 
00063     /* Set match value for PWM match channel 0 = 256, update immediately */
00064     PWM_MatchUpdate(LPC_PWM1, 0, 256, PWM_MATCH_UPDATE_NOW);
00065     /* PWM Timer/Counter will be reset when channel 0 matching
00066      * no interrupt when match
00067      * no stop when match */
00068     PWMMatchCfgDat.IntOnMatch = DISABLE;
00069     PWMMatchCfgDat.MatchChannel = 0;
00070     PWMMatchCfgDat.ResetOnMatch = ENABLE;
00071     PWMMatchCfgDat.StopOnMatch = DISABLE;
00072     PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);
00073 
00074     /* Configure each PWM channel: --------------------------------------------- */
00075     /* - Single edge
00076      * - PWM Duty on each PWM channel determined by
00077      * the match on channel 0 to the match of that match channel.
00078      * Example: PWM Duty on PWM channel 1 determined by
00079      * the match on channel 0 to the match of match channel 1.
00080      */
00081 
00082     /* Configure PWM channel edge option
00083      * Note: PWM Channel 1 is in single mode as default state and
00084      * can not be changed to double edge mode */
00085     for (temp = 2; temp < 7; temp++)
00086     {
00087         PWM_ChannelConfig(LPC_PWM1, temp, PWM_CHANNEL_SINGLE_EDGE);
00088     }
00089 
00090 
00091     /* Configure match value for each match channel */
00092     temp2 = 10;
00093     for (temp = 1; temp < 7; temp++)
00094     {
00095         /* Set up match value */
00096         PWM_MatchUpdate(LPC_PWM1, temp, temp2, PWM_MATCH_UPDATE_NOW);
00097         /* Configure match option */
00098         PWMMatchCfgDat.IntOnMatch = DISABLE;
00099         PWMMatchCfgDat.MatchChannel = temp;
00100         PWMMatchCfgDat.ResetOnMatch = DISABLE;
00101         PWMMatchCfgDat.StopOnMatch = DISABLE;
00102         PWM_ConfigMatch(LPC_PWM1, &PWMMatchCfgDat);
00103         /* Enable PWM Channel Output */
00104         PWM_ChannelCmd(LPC_PWM1, temp, ENABLE);
00105         /* Increase match value by 10 */
00106         temp2 += 10;
00107     }
00108 
00109     /* Reset and Start counter */
00110     PWM_ResetCounter(LPC_PWM1);
00111     PWM_CounterCmd(LPC_PWM1, ENABLE);
00112 
00113     /* Start PWM now */
00114     PWM_Cmd(LPC_PWM1, ENABLE);
00115 
00116     /* Loop forever */
00117     while(1);
00118     return 1;
00119 }
00120 
00121 /* With ARM and GHS toolsets, the entry point is main() - this will
00122    allow the linker to generate wrapper code to setup stacks, allocate
00123    heap area, and initialize and copy code and data segments. For GNU
00124    toolsets, the entry point is through __start() in the crt0_gnu.asm
00125    file, and that startup code will setup stacks and data */
00126 int main(void)
00127 {
00128     return c_entry();
00129 }
00130 
00131 
00132 #ifdef  DEBUG
00133 /*******************************************************************************
00134 * @brief        Reports the name of the source file and the source line number
00135 *               where the CHECK_PARAM error has occurred.
00136 * @param[in]    file Pointer to the source file name
00137 * @param[in]    line assert_param error line source number
00138 * @return       None
00139 *******************************************************************************/
00140 void check_failed(uint8_t *file, uint32_t line)
00141 {
00142     /* User can add his own implementation to report the file name and line number,
00143      ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
00144 
00145     /* Infinite loop */
00146     while(1);
00147 }
00148 #endif
00149 
00150 /*
00151  * @}
00152  */