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41 lines
1.0 KiB
41 lines
1.0 KiB
/* |
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LED blink project for the STM32L011 |
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Assumes LED at Pin 6, GPIO PA0 |
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*/ |
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#include "stm32l011xx.h" |
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volatile unsigned long SysTickCount = 0; |
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void __attribute__ ((interrupt, used)) SysTick_Handler(void) |
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{ |
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SysTickCount++; |
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if ( SysTickCount & 1 ) |
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GPIOA->BSRR = GPIO_BSRR_BS_0; /* atomic set PA0 */ |
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else |
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GPIOA->BSRR = GPIO_BSRR_BR_0; /* atomic clr PA0 */ |
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} |
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int main() |
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{ |
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RCC->IOPENR |= RCC_IOPENR_IOPAEN; /* Enable clock for GPIO Port A */ |
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__NOP(); |
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__NOP(); |
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GPIOA->MODER &= ~GPIO_MODER_MODE0; /* clear mode for PA0 */ |
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GPIOA->MODER |= GPIO_MODER_MODE0_0; /* Output mode for PA0 */ |
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GPIOA->OTYPER &= ~GPIO_OTYPER_OT_0; /* no Push/Pull for PA0 */ |
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GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEED0; /* low speed for PA0 */ |
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GPIOA->PUPDR &= ~GPIO_PUPDR_PUPD0; /* no pullup/pulldown for PA0 */ |
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GPIOA->BSRR = GPIO_BSRR_BR_0; /* atomic clr PA0 */ |
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SysTick->LOAD = 2000*500 - 1; |
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SysTick->VAL = 0; |
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SysTick->CTRL = 7; /* enable, generate interrupt (SysTick_Handler), do not divide by 2 */ |
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for(;;) |
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; |
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}
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