MPC5748GSDK定时器timing_pal

前言

MPC5748G开发环境搭建
MPC5748G S32_SDK_PA_RTM_3.0.0 GPIO 调试仿真设置

前两篇讲了开发环境的搭建, GPIO的读写操作, 调试仿真的设置等, 本篇介绍下定时器的使用.

定时器简介

MPC5748G的定时器种类有点多:

其中, 一个PIT和3个STM类似于我们传统意义上的定时器.

PIT有16通道, 每通道有32位长, 连续通道可以软件链成64位定时器:

3个STM的介绍:

PIT和STM都可以用SDK中的timing_pal来操作. 这里以PIT为例.

新建工程

仍以DEVKIT-MPC5748G为例, 使用定时器翻转LED(PTJ4). 新建工程步骤如下:

• 打开S32, File -> New -> S32DS Application Project
• 选择MCU: MPC5748G, 填入工程名
• 默认3个核都勾上了, 这里去掉Z4_1和Z2_2的勾选, 只保留Z4_0, 选择SDK: MPC5748G_SDK_Z4_0 3.0.0, 点击Finish结束:
  

PE配置

先把PJ4的LED搞上去:

Components Library中双击添加timing_pal:

点击左侧timing_pal1:timing_pal进行配置:

Channel可选0~15通道, 类型可选连续(Continuous)或者单次(One-shot), 通道的回调函数名字自己写.

点击生成代码:

补全代码

/* User includes (#include below this line is not maintained by Processor Expert) */#define LED_PORT PTJ
#define LED_PIN 4U#define PIT_CHANNEL 0UL
#define PERIOD_BY_NS 1000000000UL /* nanosecond unit, The period is 1 second */void pit_0_callback(void * userData) {(void)userData;PINS_DRV_TogglePins(LED_PORT, (1 << LED_PIN));
}/*! \brief The main function for the project.\details The startup initialization sequence is the following:* - startup asm routine* - main()
*/
int main(void)
{/* Write your local variable definition here */uint64_t pitResolution;/*** Processor Expert internal initialization. DON&＃39;T REMOVE THIS CODE!!! ***/#ifdef PEX_RTOS_INITPEX_RTOS_INIT(); /* Initialization of the selected RTOS. Macro is defined by the RTOS component. */#endif/*** End of Processor Expert internal initialization. ***//* Write your code here *//* For example: for(;;) { } *//* Initialize clock gate*/CLOCK_SYS_Init(g_clockManConfigsArr, CLOCK_MANAGER_CONFIG_CNT,g_clockManCallbacksArr, CLOCK_MANAGER_CALLBACK_CNT);CLOCK_SYS_UpdateConfiguration(0U, CLOCK_MANAGER_POLICY_AGREEMENT);/* Initialize and configure pins */PINS_DRV_Init(NUM_OF_CONFIGURED_PINS, g_pin_mux_InitConfigArr);PINS_DRV_SetPins(LED_PORT, (1 << LED_PIN));/* Initialize TIMING over PIT */TIMING_Init(&timing_pal1_instance, &timing_pal1_InitConfig);/* Get tick resolution in nanosecond unit for TIMING over PIT */TIMING_GetResolution(&timing_pal1_instance, TIMER_RESOLUTION_TYPE_NANOSECOND, &pitResolution);/* Start PIT channel 0 counting with the period is 1 second,the period in tick &＃61; the period in nanosecond / PIT tick resolution in nanosecond */TIMING_StartChannel(&timing_pal1_instance, PIT_CHANNEL, PERIOD_BY_NS/pitResolution);while(1);/*** Don&＃39;t write any code pass this line, or it will be deleted during code generation. ***//*** RTOS startup code. Macro PEX_RTOS_START is defined by the RTOS component. DON&＃39;T MODIFY THIS CODE!!! ***/#ifdef PEX_RTOS_STARTPEX_RTOS_START(); /* Startup of the selected RTOS. Macro is defined by the RTOS component. */#endif/*** End of RTOS startup code. ***//*** Processor Expert end of main routine. DON&＃39;T MODIFY THIS CODE!!! ***/for(;;) {if(exit_code !&＃61; 0) {break;}}return exit_code;/*** Processor Expert end of main routine. DON&＃39;T WRITE CODE BELOW!!! ***/
} /*** End of main routine. DO NOT MODIFY THIS TEXT!!! ***//* END main */


这里调试没有运行起来, 下载进去拔掉OpenSDA的USB可以运行, 还不晓得哪里出了什么差错.

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