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168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/* Copyright (C) 2022 Alif Semiconductor - All Rights Reserved.
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* Use, distribution and modification of this code is permitted under the
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* terms stated in the Alif Semiconductor Software License Agreement
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*
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* You should have received a copy of the Alif Semiconductor Software
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* License Agreement with this file. If not, please write to:
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* contact@alifsemi.com, or visit: https://alifsemi.com/license
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*
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*/
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/**************************************************************************//**
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* @file LPTimer_Baremetal.c
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* @author Manoj A Murudi
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* @email manoj.murudi@alifsemi.com
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* @version V1.0.0
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* @date 22-March-2022
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* @brief baremetal demo application for lptimer.
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* - Configuring the lptimer channel 0 for 5 seconds.
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* @bug None.
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* @Note None
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******************************************************************************/
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#include <stdio.h>
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#include <stdlib.h>
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#include "Driver_LPTIMER.h"
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#include "RTE_Components.h"
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#include CMSIS_device_header
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#if defined(RTE_Compiler_IO_STDOUT)
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#include "retarget_stdout.h"
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#endif /* RTE_Compiler_IO_STDOUT */
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extern ARM_DRIVER_LPTIMER DRIVER_LPTIMER0;
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ARM_DRIVER_LPTIMER *ptrDrv = &DRIVER_LPTIMER0;
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#define LPTIMER_CHANNEL_0 0
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volatile uint32_t Cb_status = 0;
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static void lptimer_cb_fun (uint8_t event)
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{
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if (event == ARM_LPTIMER_EVENT_UNDERFLOW)
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{
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Cb_status++;
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}
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}
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static void lptimer_Thread ()
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{
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/* Configuring the lptimer channel 0 for 5 seconds
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*Clock Source is depends on RTE_LPTIMER_CHANNEL_CLK_SRC in RTE_Device.h
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*RTE_LPTIMER_CHANNEL_CLK_SRC = 0 : 32.768KHz freq (Default)
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*RTE_LPTIMER_CHANNEL_CLK_SRC = 1 : 128KHz freq.
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*
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* Selected clock frequency (F)= 32.768KHz
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*
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* time for 1 count T = 1/F = 1/(32.768*10^3) = 30.51 * 10^-6
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*
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* To increment timer by 1 count, takes 30.51 micro sec
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*
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* So count for 5sec = 5/(30.51 *(10^-6)) = 163880
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*
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* DEC = 163880
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* HEX = 0x28028
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*/
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/* Timer channel configured 5 sec */
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int32_t ret;
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uint32_t count = 0x28028;
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uint8_t channel = LPTIMER_CHANNEL_0;
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ret = ptrDrv->Initialize (channel, lptimer_cb_fun);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: channel '%d'failed to initialize\r\n", channel);
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return;
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}
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ret = ptrDrv->PowerControl (channel, ARM_POWER_FULL);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: channel '%d'failed to power up\r\n", channel);
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goto error_uninstall;
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}
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/**< Loading the counter value >*/
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ret = ptrDrv->Control (channel, ARM_LPTIMER_SET_COUNT1, &count);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: channel '%d'failed to load count\r\n", channel);
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goto error_poweroff;
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}
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printf("demo application: lptimer channel '%d' configured for 5 sec \r\n\n", channel);
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ret = ptrDrv->Start (channel);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: failed to start channel '%d' timer\n", channel);
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goto error_poweroff;
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}
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else
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{
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printf("timer started\r\n");
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}
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/* delay for 6sec */
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for(uint32_t count = 0; count < 60; count++)
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sys_busy_loop_us(100000);
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if (Cb_status)
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{
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printf("5 seconds timer expired \r\n");
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Cb_status = 0;
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}
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else
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{
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printf("Error: timer is failed \r\n");
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}
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ret = ptrDrv->Stop(channel);
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if(ret != ARM_DRIVER_OK)
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{
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printf("ERROR: failed to stop channel %d\n", channel);
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}
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else
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{
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printf("timer stopped\r\n\n");
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}
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error_poweroff:
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ret = ptrDrv->PowerControl(channel, ARM_POWER_OFF);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: failed to power off channel '%d'\n", channel);
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}
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error_uninstall:
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ret = ptrDrv->Uninitialize(channel);
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if (ret != ARM_DRIVER_OK)
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{
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printf("ERROR: failed to un-initialize channel %d\n", channel);
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}
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printf("demo application: completed \r\n");
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}
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int main()
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{
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#if defined(RTE_Compiler_IO_STDOUT_User)
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int32_t ret;
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ret = stdout_init();
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if(ret != ARM_DRIVER_OK)
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{
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while(1)
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{
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}
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}
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#endif
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lptimer_Thread();
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return 0;
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}
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