Solved
STM8L151G3 TIM4 not working
MCU: STM8L151G3U6
ISSUE: TIM4 interrupt doesnt seem working
Connections:
1. LED on pin PB0
2. Push button/ switch on pin PC5
Scenario:
1. User press the push button
2. Toggles the LED
Observation:
Without using the TIM4 interrupt, the code works perfectly fine, when the TIM4 is used, the excutions reaches the first wait_50ms(); (red colour) and never go beyond this line, I would appreciate if any one would address the issue. BTW: I have used IRQHandler, 23 also but same result.
/===== Header files ======
#include "stm8l15x.h"
// Software timing counters
volatile uint16_t tick_1ms = 0;
volatile uint8_t flag_50ms = 0;
volatile uint8_t flag_100ms = 0;
volatile uint8_t flag_1min = 0;
volatile uint16_t soft_50ms = 0;
volatile uint16_t soft_100ms = 0;
volatile uint16_t soft_1min = 0;
//==== System Clock Configuration =====
void CLK_Config(void)
{
CLK_DeInit(); // Reset the clock to its default setting
CLK_HSICmd(ENABLE);// Enable the internal clock speec osscilator ( HSI = 16 MHz)
while(CLK_GetFlagStatus(CLK_FLAG_HSIRDY) == RESET);// Wait until HSI is ready and stable
CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSI);// Set HSI as a system clock source
CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1); // Set system clock prescaler: devide by 1(full 16 MHz)
}
void TIM4_Config(void)
{
TIM4_DeInit();
TIM4_TimeBaseInit(TIM4_Prescaler_128, 125); // 16MHz / 128 = 125kHz; 125 -> 1ms
TIM4_ClearFlag(TIM4_FLAG_Update);
TIM4_ITConfig(TIM4_IT_Update, ENABLE);
TIM4_Cmd(ENABLE);
}
INTERRUPT_HANDLER(TIM4_UPD_OVF_TRG_IRQHandler, 25)
{
TIM4_ClearITPendingBit(TIM4_IT_Update);
tick_1ms++;
if (++soft_50ms >= 50) {
soft_50ms = 0;
flag_50ms = 1;
}
if (++soft_100ms >= 100) {
soft_100ms = 0;
flag_100ms = 1;
}
if (++soft_1min >= 60000) {
soft_1min = 0;
flag_1min = 1;
}
//TIM4_ClearITPendingBit(TIM4_IT_Update);
}
// Utility: wait for 50ms debounce
void wait_50ms(void)
{
flag_50ms = 0;
while (!flag_50ms);
}
void wait_100ms(void)
{
flag_100ms = 0;
while (!flag_100ms);
}
//==== Main Function =====
int main()
{
uint8_t system_on = 0; // 0 = off, 1 = on
GPIO_Init(GPIOC, GPIO_Pin_5, GPIO_Mode_In_PU_No_IT); // Initialize Buttons Input
GPIO_Init(GPIOB, GPIO_Pin_0, GPIO_Mode_Out_PP_Low_Fast); // Initialize LEDS
CLK_Config(); // System clock
TIM4_Config();
enableInterrupts();
while(1)
{
if(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_5) == RESET)
{
wait_50ms();
if(system_on == 0)
{
// Turn on system
system_on = 1;
GPIO_SetBits(GPIOB, GPIO_Pin_0);
// Blink twice
GPIO_ToggleBits(GPIOB, GPIO_Pin_0);
wait_100ms();
GPIO_ToggleBits(GPIOB, GPIO_Pin_0);
wait_100ms();
}
else
{
// Turn off system
system_on = 0;
GPIO_ResetBits(GPIOB, GPIO_Pin_0);
}
while(GPIO_ReadInputDataBit(GPIOC, GPIO_Pin_5) == RESET)
wait_50ms();
}
}
}Edited to apply source code formatting - please see How to insert source code for future reference.