1 files changed, 82 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..eb093c4
--- /dev/null
+++ b/main.c
@@ -0,0 +1,82 @@
+
+#include <stm32f407xx.h>
+#include <stdint.h>
+#include <system_stm32f4xx.h>
+#include <stm32f4xx_ll_utils.h>
+#include <stm32f4xx_ll_spi.h>
+#include <string.h>
+#include <unistd.h>
+/* 
+ * Part number: STM32F030F4C6
+ */
+
+void _init(void) {}
+
+void tick(void) {
+    for(int i=0; i<50; i++)
+        __asm__("nop");
+}
+
+int main(void) {
+    /*
+    RCC->CR |= RCC_CR_HSEON;
+    while (!(RCC->CR&RCC_CR_HSERDY));
+    RCC->CFGR &= ~RCC_CFGR_PLLMUL_Msk & ~RCC_CFGR_SW_Msk;
+    RCC->CFGR |= (2<<RCC_CFGR_PLLMUL_Pos) | RCC_CFGR_PLLSRC_HSE_PREDIV;
+    RCC->CFGR2 &= ~RCC_CFGR2_PREDIV_Msk;
+    RCC->CFGR2 |= RCC_CFGR2_PREDIV_DIV2;
+    RCC->CR |= RCC_CR_PLLON;
+    while (!(RCC->CR&RCC_CR_PLLRDY));
+    RCC->CFGR |= (2<<RCC_CFGR_SW_Pos);
+    SystemCoreClockUpdate();
+    */
+
+    LL_Init1msTick(SystemCoreClock);
+
+    RCC->AHB1ENR  |= RCC_AHB1ENR_GPIOAEN;
+
+    GPIOA->MODER |=
+        (1<<GPIO_MODER_MODER5_Pos)|
+        (1<<GPIO_MODER_MODER6_Pos)|
+        (1<<GPIO_MODER_MODER7_Pos);
+
+    /* Set shift register IO GPIO output speed */
+    GPIOA->OSPEEDR |=
+        (2<<GPIO_OSPEEDR_OSPEED5_Pos)|
+        (2<<GPIO_OSPEEDR_OSPEED6_Pos)|
+        (2<<GPIO_OSPEEDR_OSPEED7_Pos);
+
+    GPIOA->BSRR = GPIO_BSRR_BR_5;
+    GPIOA->BSRR = GPIO_BSRR_BR_6;
+    GPIOA->BSRR = GPIO_BSRR_BR_7;
+    while (42) {
+        for (int i=0; i<10000; i++)
+            tick();
+        GPIOA->BSRR = GPIO_BSRR_BS_5;
+        GPIOA->BSRR = GPIO_BSRR_BS_6;
+        GPIOA->BSRR = GPIO_BSRR_BS_7;
+        for (int i=0; i<10000; i++)
+            tick();
+        GPIOA->BSRR = GPIO_BSRR_BR_5;
+        GPIOA->BSRR = GPIO_BSRR_BR_6;
+        GPIOA->BSRR = GPIO_BSRR_BR_7;
+    }
+}
+
+void NMI_Handler(void) {
+}
+
+void HardFault_Handler(void) {
+    for(;;);
+}
+
+void SVC_Handler(void) {
+}
+
+
+void PendSV_Handler(void) {
+}
+
+void SysTick_Handler(void) {
+}
+