68 lines
1.3 KiB
C
68 lines
1.3 KiB
C
/*
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* Blink the status LED on the CopterControl.
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*
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* Michael Hope <michaelh@juju.net.nz>
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*
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*/
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#include <stdint.h>
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#include "libmaple/rcc.h"
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#include "libmaple/gpio.h"
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/* GPIOC12 for the H103, GPIOA6 for the CopterControl. */
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#define PORT GPIOA_BASE
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/* Optimization barrier */
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#define barrier() __asm__ __volatile__("": : :"memory")
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void _start();
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extern uint32_t __stack_top;
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/* Main vector table. Pulled in by the linker script. */
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__attribute__((section(".vectors")))
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const void *vectors[] =
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{
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&__stack_top,
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_start,
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};
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/** Spin delay */
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void delay(int count)
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{
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for (int i = 0; i < 10000*count; i++)
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{
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barrier();
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}
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}
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/** Main function. Called by the startup code. */
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void _start()
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{
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// Most of the peripherals are connected to APB2. Turn on the
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// clocks for the interesting peripherals
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RCC_BASE->APB2ENR = 0
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// Turn on USART1
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| RCC_APB2ENR_USART1EN
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// Turn on IO Ports A, B, and C
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| RCC_APB2ENR_IOPAEN
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| RCC_APB2ENR_IOPBEN
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| RCC_APB2ENR_IOPCEN
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// Turn on the alternate function block
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| RCC_APB2ENR_AFIOEN;
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// Put all pins 15 into open drain output function/50 MHz
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// mode.
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PORT->CRL = 0x33333333;
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PORT->CRH = 0x33333333;
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for (;;)
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{
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delay(1000);
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PORT->ODR = ~0;
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delay(500);
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PORT->ODR = 0;
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}
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}
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