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-rw-r--r--00-hello/main.c354
1 files changed, 0 insertions, 354 deletions
diff --git a/00-hello/main.c b/00-hello/main.c
deleted file mode 100644
index fe2b9d5..0000000
--- a/00-hello/main.c
+++ /dev/null
@@ -1,354 +0,0 @@
-#define __IO volatile
-
-#include <stdint.h>
-#define RCC_BASE_2 0x40021000
-
-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 */
-};
-
-typedef struct {
- __IO uint32_t value;
-} rcc_reg_t;
-
-#define RCC_AHB2ENR (*((__IO rcc_reg_t*)(RCC_BASE_2 + 0x4c)))
-
-typedef enum {
- GPIO_PORT_A = 0,
- GPIO_PORT_B = 1,
- GPIO_PORT_C = 2,
- GPIO_PORT_D = 3
-} gpio_port_number_t;
-
-void enable_gpio(gpio_port_number_t port)
-{
- RCC_AHB2ENR.value |= 1 << port;
-}
-
-typedef enum {
- PIN_0 = 0,
- PIN_1 = 1,
- PIN_2 = 2,
- PIN_3 = 3,
- PIN_4 = 4,
- PIN_5 = 5,
- PIN_6 = 6,
- PIN_7 = 7,
- PIN_8 = 8,
- PIN_9 = 9,
- PIN_10 = 10,
- PIN_11 = 11,
- PIN_12 = 12,
- PIN_13 = 13,
- PIN_14 = 14,
- PIN_15 = 15
-} pin_t;
-
-typedef enum {
- MODE_INPUT = 0,
- MODE_OUTPUT = 1,
- MODE_ALTERNATE = 2,
- MODE_ANALOG = 3
-} pin_mode_t;
-
-/* GPIO port speed. */
-typedef enum {
- SPEED_2MHZ = 0,
- SPEED_10MHZ = 1,
- SPEED_50MHZ = 3,
-} speed_t;
-
-/*
- * Mode register. Input, output, alternate functiont or analog.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) mode_reg_t;
-
-/*
- * Type register. Push/pull or open drain.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) type_reg_t;
-
-/*
- * Speed register. Allows low, meduim, fast or high speed.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) speed_reg_t;
-
-/*
- * Pull up/pull down register. Allows pull up, pull down, or no pull up or
- * pull down.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) pull_reg_t;
-
-/*
- * Stores the data for reading from the outside.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) input_data_reg_t;
-
-/*
- * Stores the data for writing to the outside.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) output_data_reg_t;
-
-/*
- * Writing a 1 to a bit in this register allows the user to set or reset a bit
- * in the output data register.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) bit_set_reset_reg_t;
-
-/*
- * Lock register. Allows the user to lock a pin so that its value cannot be
- * changed.
- */
-typedef struct {
- __IO uint32_t value;
-} __attribute__((packed)) lock_reg_t;
-
-/*
- * Alternate function.
- */
-typedef struct {
- __IO uint32_t value_high;
- __IO uint32_t value_low;
-} __attribute__((packed)) alt_function_reg_t;
-
-/* Structure defining the layout of a GPIO port on the STM32L432. */
-typedef struct {
- __IO mode_reg_t mode; /* Mode register */
- __IO pull_reg_t pupd; /* Pull up/pull down/none register */
- __IO speed_reg_t speed; /* Speed register */
- __IO type_reg_t type; /* Type register */
- __IO input_data_reg_t input; /* Input data register */
- __IO output_data_reg_t output; /* Output data register */
- __IO bit_set_reset_reg_t bsr; /* Bit set/reset register */
- __IO lock_reg_t lock; /* Lock register */
- __IO alt_function_reg_t altfn; /* Alternate function registers */
-} __attribute__((packed)) gpio_port_t;
-
-/*
- * Defines for GPIO memory mapped addresses.
- */
-#define GPIO_A (*((__IO gpio_port_t*)0x48000000))
-#define GPIO_B (*((__IO gpio_port_t*)0x48000400))
-#define GPIO_C (*((__IO gpio_port_t*)0x48000800))
-
-/*
- * Delays for `delay` iterations.
- */
-void delay(uint32_t delay)
-{
- while (delay--) {
- // Empty volatile assembly to keep the optimizer from getting
- // rid of this loop entirely.
- asm volatile("");
- }
-}
-
-/*
- * Sets the mode of a pin on a gpio port.
- *
- * gpio_port: the gpio port.
- * pin: the number of the port;
- * pin_mode: the mode of the pin. See pin_mode_t enum.
- */
-void set_gpio_pin_mode(
- __IO gpio_port_t* gpio_port, uint32_t pin, pin_mode_t pin_mode)
-{
- gpio_port->mode.value &= ~(0x03 << pin * 2);
- gpio_port->mode.value |= pin_mode << pin * 2;
-}
-
-/*
- * Sets the value on an output GPIO pin.
- *
- * gpio_port: The gpio port.
- * pin: the number of the pin to enable. Values 0-15
- * val: 0 to set the gpio pin to low, non-zero to set to high.
- */
-void set_gpio_pin(__IO gpio_port_t* gpio_port, uint32_t pin, int val)
-{
- if (val) {
- gpio_port->output.value |= 1 << pin;
- } else {
- gpio_port->output.value &= ~(1 << pin);
- }
-}
-
-/* Main function. This gets executed from the interrupt vector defined above. */
-int main()
-{
- /* Enable the GPIO port B. */
- enable_gpio(GPIO_PORT_B);
-
- /* Set pin 3 and pin 1 of GPIO_B to be an output pin. */
- set_gpio_pin_mode(&GPIO_B, /* pin = */ 3, MODE_OUTPUT);
- set_gpio_pin_mode(&GPIO_B, /* pin = */ 1, MODE_OUTPUT);
-
- while (1) {
- /* Set the GPIO pin to high. */
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 1);
- set_gpio_pin(&GPIO_B, /* pin = */ 1, 0);
- 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. */
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 0);
- set_gpio_pin(&GPIO_B, /* pin = */ 1, 1);
- 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()
-{
- for (;;) {
- /* Flash in a distinct pattern to know that something went wrong. */
-
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 0);
- delay(100000);
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 1);
- delay(100000);
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 0);
- delay(100000);
- set_gpio_pin(&GPIO_B, /* pin = */ 3, 1);
- delay(500000);
- }
-}
generated by cgit (git 2.34.1) at 2025-07-03 23:15:28 +0000