diff options
author | Thomas Gravekamp <me@thomas-gravekamp.nl> | 2017-10-31 23:33:50 +0100 |
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committer | Thomas Gravekamp <me@thomas-gravekamp.nl> | 2017-10-31 23:34:43 +0100 |
commit | 9bc221d2c6b3d4b69fdfa2ab3d5cafc05a5d7304 (patch) | |
tree | 85bf83e137461ec89ba74fd27e472a362102d77c /src | |
parent | c5a0d0355b72aca0ce9a92225130600ff30de54b (diff) |
Add initial files.
Diffstat (limited to 'src')
-rw-r--r-- | src/main.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c new file mode 100644 index 0000000..e9a7b77 --- /dev/null +++ b/src/main.c @@ -0,0 +1,33 @@ +#include <stm32f0xx.h> + +// Quick and dirty delay +static void delay (unsigned int time) { + for (unsigned int i = 0; i < time; i++) + for (volatile unsigned int j = 0; j < 2000; j++); +} + +int main (void) { + // Turn on the GPIOA peripheral + RCC->AHBENR |= RCC_AHBENR_GPIOAEN; + + // Put pin in general purpose output mode (B01) + GPIOA->MODER |= GPIO_MODER_MODER4_0; + // Set the output type to push pull (B0 = default) + // GPIOA->OTYPER = ~GPIO_OTYPER_OT_4; + // Set the output speed to low (B00 = default) + // GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEEDR4; + // Set the pull up/down resistors (B00 = default) + // GPIOA->PUPDR &= ~GPIO_PUPDR_PUPDR4; + + while (1) { + // Reset the bit for port A4 + GPIOA->BSRR = GPIO_BSRR_BR_4; + + delay(500); + + // Set the bit for port A4 + GPIOA->BSRR = GPIO_BSRR_BS_4; + + delay(500); + } +} |