diff options
Diffstat (limited to 'system-clock/src/main.c')
| -rw-r--r-- | system-clock/src/main.c | 183 |
1 files changed, 183 insertions, 0 deletions
diff --git a/system-clock/src/main.c b/system-clock/src/main.c new file mode 100644 index 0000000..f7a30e8 --- /dev/null +++ b/system-clock/src/main.c @@ -0,0 +1,183 @@ +#include "gpio.h" + +int main(); + +void spin(); + +/* + * Interrupt service routine handlers. + */ +const void* vectors[] __attribute__((section(".vectors"))) = { + (void *) 0x2000c000, /* Top of stack at top of sram1. 48k */ + main, /* Reset handler */ + spin, /* NMI */ + spin, /* Hard Fault */ + spin, /* MemManage */ + spin, /* BusFault */ + spin, /* UsageFault */ + spin, /* Reserved */ + spin, /* Reserved */ + spin, /* Reserved */ + spin, /* Reserved */ + spin, /* SVCall */ + spin, /* Debug */ + spin, /* Reserved */ + spin, /* PendSV */ + spin, /* SysTick */ + +/* External interrupt handlers follow */ + spin, /* 0 WWDG */ + spin, /* 1 PVD */ + spin, /* 2 TAMP_SAMP */ + spin, /* 3 RTC_WKUP */ + spin, /* 4 FLASH */ + spin, /* 5 RCC */ + spin, /* 6 EXTI0 */ + spin, /* 7 EXTI1 */ + spin, /* 8 EXTI2 */ + spin, /* 9 EXTI3 */ + spin, /* 10 EXTI4 */ + spin, /* 11 DMA_CH1 */ + spin, /* 12 DMA_CH2 */ + spin, /* 13 DMA_CH3 */ + spin, /* 14 DMA_CH4 */ + spin, /* 15 DMA_CH5 */ + spin, /* 16 DMA_CH6 */ + spin, /* 17 DMA_CH7 */ + spin, /* 18 ADC1 */ + spin, /* 19 CAN_TX */ + spin, /* 20 CAN_RX0 */ + spin, /* 21 CAN_RX1 */ + spin, /* 22 CAN_SCE */ + spin, /* 23 EXTI9_5 */ + spin, /* 24 TIM1_BRK/TIM15 */ + spin, /* 25 TIM1_UP/TIM16 */ + spin, /* 26 TIM1_TRG_COM */ + spin, /* 27 TIM1_CC */ + spin, /* 28 TIM2 */ + spin, /* 29 Reserved */ + spin, /* 30 Reserved */ + spin, /* 31 I2C1_EV */ + spin, /* 32 I2C1_ER */ + spin, /* 33 I2C2_EV */ + spin, /* 34 I2C2_ER */ + spin, /* 35 SPI1 */ + spin, /* 36 SPI2 */ + spin, /* 37 USART1 */ + spin, /* 38 USART2 */ + spin, /* 39 USART3 */ + spin, /* 40 EXTI15_10 */ + spin, /* 41 RTCAlarm */ + spin, /* 42 Reserved */ + spin, /* 43 Reserved */ + spin, /* 44 Reserved */ + spin, /* 45 Reserved */ + spin, /* 46 Reserved */ + spin, /* 47 Reserved */ + spin, /* 48 Reserved */ + spin, /* 49 SDMMC1 */ + spin, /* 50 Reserved */ + spin, /* 51 SPI3 */ + spin, /* 52 Reserved */ + spin, /* 53 Reserved */ + spin, /* 54 TIM6_DACUNDER */ + spin, /* 55 TIM7 */ + spin, /* 56 DMA2_CH1 */ + spin, /* 57 DMA2_CH2 */ + spin, /* 58 DMA2_CH3 */ + spin, /* 59 DMA2_CH4 */ + spin, /* 60 DMA2_CH5 */ + spin, /* 61 Reserved */ + spin, /* 62 Reserved */ + spin, /* 63 Reserved*/ + spin, /* 64 COMP */ + spin, /* 65 LPTIM1 */ + spin, /* 66 LPTIM2 */ + spin, /* 67 USB_FS */ + spin, /* 68 DMA_CH6 */ + spin, /* 69 DMA_CH7 */ + spin, /* 70 LPUART1 */ + spin, /* 71 QUADSPI */ + spin, /* 72 I2C3_EV */ + spin, /* 73 I2C3_ER */ + spin, /* 74 SAI1 */ + spin, /* 75 Reserved */ + spin, /* 76 SWPMI1 */ + spin, /* 77 TSC */ + spin, /* 78 Reserved */ + spin, /* 79 AES */ + spin, /* 80 RNG */ + spin, /* 81 FPU */ + spin /* 82 CRS */ +}; + +/* Delay for some number of iterations. */ +void delay(uint32_t itrs) +{ + /* Need to keep the compiler from optimizing this loop out entirely. */ + while(itrs --) { + asm volatile (""); + } +} + +/* Main function. This gets executed from the interrupt vector defined above. */ +int main() +{ + /* Enable the GPIO port B. */ + + __IO gpio_port_t* port_b = enable_gpio(GPIO_PORT_B); + gpio_output_pin_t pin3 = set_gpio_pin_output(port_b, PIN_3); + gpio_output_pin_t pin1 = set_gpio_pin_output(port_b, PIN_1); + + while(1) { + /* Set the GPIO pin to high. */ + pin_on(pin3); + pin_off(pin1); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + + /* Set the GPIO pin to low. */ + pin_off(pin3); + pin_on(pin1); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + delay(65535); + } +} + +/* + * Does nothing ... forever. + */ +void spin() +{ + __IO gpio_port_t* port_b = enable_gpio(GPIO_PORT_B); + gpio_output_pin_t pin3 = set_gpio_pin_output(port_b, PIN_3); + for(;;) { + + /* Flash in a distinct pattern to know that something went wrong. */ + + pin_off(pin3); + delay(100000); + pin_on(pin3); + delay(100000); + pin_off(pin3); + delay(100000); + pin_on(pin3); + delay(500000); + } +} |