diff options
Diffstat (limited to 'main.c')
| -rw-r--r-- | main.c | 63 |
1 files changed, 15 insertions, 48 deletions
@@ -1,16 +1,10 @@ -#include "stm32l476xx.h"
-
-#define STK_CTRL *((uint32_t *)0xE000E010)
-#define STK_LOAD *((uint32_t *)0xE000E014)
-#define STK_VAL *((uint32_t *)0xE000E018)
-#define STK_CALIB *((uint32_t *)0xE000E01C)
-
-extern void delay(uint32_t count);
+#include <stm32l476xx.h>
+#include <clock.h>
/**
* Accomplishments:
* - GPIO in/out
- * - got to 40MHz clock
+ * - got to 80MHz clock
*/
void pulse(uint8_t byte);
@@ -21,50 +15,23 @@ int main(void) FLASH->ACR &= ~(FLASH_ACR_LATENCY);
FLASH->ACR |= FLASH_ACR_LATENCY_2WS;
- // turn on HSI
- RCC->CR |= RCC_CR_HSION;
- while ((RCC->CR & RCC_CR_HSIRDY) != RCC_CR_HSIRDY);
-
- // get PLLR to 80MHz (max)
- // VCO = C * (N/M) -> 16 * (10/1) = 160
- // SCLK = VCO / R = 160 / 4 = 40 MHz
- RCC->PLLCFGR &= ~(RCC_PLLCFGR_PLLSRC); // source HSI, 16MHz
- RCC->PLLCFGR |= RCC_PLLCFGR_PLLSRC_HSI;
- RCC->PLLCFGR &= ~(RCC_PLLCFGR_PLLN | RCC_PLLCFGR_PLLM);
- RCC->PLLCFGR |= 10 << RCC_PLLCFGR_PLLN_Pos;
- RCC->PLLCFGR &= ~(RCC_PLLCFGR_PLLR); // /4
- RCC->PLLCFGR |= 1 << RCC_PLLCFGR_PLLR_Pos;
- RCC->PLLCFGR |= RCC_PLLCFGR_PLLREN; // PLLR on
-
- // start PLL
- RCC->CR |= RCC_CR_PLLON;
- while ((RCC->CR & RCC_CR_PLLRDY) != RCC_CR_PLLRDY);
-
- // set system clock to PLL
- RCC->CFGR &= ~(RCC_CFGR_SW);
- RCC->CFGR |= RCC_CFGR_SW_PLL;
- while ((RCC->CFGR & RCC_CFGR_SWS_PLL) != RCC_CFGR_SWS_PLL);
-
- // SysTick setup? Assume 4MHz reset clock
- STK_LOAD = 40000;
- STK_CTRL |= 0x07; // AHB, inten, enable
+ clock_init();
RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN; // A clk enable
- GPIOA->MODER &= ~(GPIO_MODER_MODE5 | GPIO_MODER_MODE0); // A5 -> output, A0 input
- GPIOA->MODER |= GPIO_MODER_MODE5_0;
- GPIOA->PUPDR &= ~(GPIO_PUPDR_PUPD5 | GPIO_PUPDR_PUPD0);
- GPIOA->PUPDR |= GPIO_PUPDR_PUPD5_0 | GPIO_PUPDR_PUPD0_1; // pd for button
-
- pulse(*((uint8_t *)0x08080000)); // 0b00100101
+ GPIOA->MODER &= ~(GPIO_MODER_MODE5 | GPIO_MODER_MODE6); // A5 -> output, A0 input
+ GPIOA->MODER |= GPIO_MODER_MODE5_0 | GPIO_MODER_MODE6_0;
+ GPIOA->PUPDR &= ~(GPIO_PUPDR_PUPD5 | GPIO_PUPDR_PUPD6);
+ GPIOA->PUPDR |= GPIO_PUPDR_PUPD5_0 | GPIO_PUPDR_PUPD6_0; // pulldown for button (1)
+ //if (GPIOA->IDR & 0x01)
- while (1);/* {
+ while (1) {
delay(500);
- //if (GPIOA->IDR & 0x01)
- GPIOA->BSRR |= 1 << 5;
+ GPIOA->BSRR |= 1 << 5;
+ GPIOA->BRR |= 1 << 6;
delay(500);
- //else
- GPIOA->BRR |= 1 << 5;
- }*/
+ GPIOA->BSRR |= 1 << 6;
+ GPIOA->BRR |= 1 << 5;
+ }
}
void _exit(int code)
|