STM8L power (current) consumption problem
Posted on August 23, 2011 at 06:42
I'm developing an application with STM8L052R8 MCU now, and this application is battery-used product. The problem is that, I cannot make the MCU consume micro-ampere order current.
I used every methods described in the reference guide manual, including active halt mode, and halt mode, but the least current indicator displayed 250uA. Of course I have stoped HSI, LSI, all timers and disabled all interrupts，disconnected other devices. GPIOs are also retested as push-pull low-slow output mode. I'm confusing.
/**
* @brief Config clock.
* @retval None
*/
static void CLK_Config(void)
{
/* Enables the Internal High Speed oscillator */
CLK_HSICmd(ENABLE);
/* Configures the system clock as HSI(16 MHz) */
CLK_SYSCLKSourceConfig(CLK_SYSCLKSource_HSI);
/* High speed external clock prescaler: 1, then 16Mhz */
CLK_SYSCLKDivConfig(CLK_SYSCLKDiv_1);
/* Wait for clock stability */
while (CLK_GetSYSCLKSource() != CLK_SYSCLKSource_HSI)
{
}
}
/**
* @brief Config GPIO.
* @retval None
*/
static void GPIO_Config(void)
{
GPIO_Init(GPIOA, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOB, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOC, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOD, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOE, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOF, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
GPIO_Init(GPIOG, 0xFF, GPIO_Mode_Out_PP_Low_Slow);
}
/**
* @brief Config Low Power Mode.
* @retval None
*/
static void LowPower_Config(void)
{
/* Configures clock during active halt modes */
CLK_HaltConfig(CLK_Halt_FastWakeup, ENABLE);
/* Enables the Fast WakeUp from Ultra Low Power mode */
PWR_FastWakeUpCmd(ENABLE);
/* Enables the Ultra Low Power mode */
PWR_UltraLowPowerCmd(ENABLE);
}
/**
* @brief Initializes the board, services, drivers, application and other modules.
* @retval None
*/
void SYS_Initialize(void)
{
/* Configures clock */
CLK_Config();
/* Configures GPIO */
GPIO_Config();
/* Configures Low Power mode */
LowPower_Config();
/* Disable system general interrupts */
disableInterrupts();
return;
}
/**
* @brief Run application tasks.
* @retval None
*/
void SYS_Tasks(void)
{
halt();
return;
}
/**
* @brief Main program.
* @param None
* @retval None
*/
void main(void)
{
SYS_Initialize();
while (1)
{
SYS_Tasks();
}
}
