1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
/*
* Oct 2017 Karl Palsson <karlp@tweak.net.au>
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/crs.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/syscfg.h>
#include <libopencm3/stm32/usart.h>
#include "uart-basic.h"
#define LED_NUC_RCC RCC_GPIOA
#define LED_NUC_PORT GPIOA
#define LED_NUC_PIN GPIO5
void usart2_isr(void)
{
ub_irq_handler();
}
static void setup_rcc_hack(void)
{
/* FIXME L0 doesn't have rcc setup helpers (yet) */
rcc_osc_on(RCC_HSI16);
rcc_wait_for_osc_ready(RCC_HSI16);
rcc_set_sysclk_source(RCC_HSI16);
/* ok, we manually poked around, let the lib know */
rcc_apb1_frequency = rcc_apb2_frequency = 16e6;
}
static void board_init(void)
{
rcc_periph_clock_enable(RCC_GPIOA);
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO2 | GPIO3);
/* usart is AF4 */
gpio_set_af(GPIOA, GPIO_AF4, GPIO2 | GPIO3);
}
int main(void)
{
int i;
int j = 0;
setup_rcc_hack();
board_init();
struct ub_hw ub = {
.uart = USART2,
.uart_nvic = NVIC_USART2_IRQ,
.uart_rcc = RCC_USART2,
};
ub_init(&ub);
printf("hi guys!\n");
/* green led for ticking */
rcc_periph_clock_enable(LED_NUC_RCC);
gpio_mode_setup(LED_NUC_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
LED_NUC_PIN);
while (1) {
gpio_toggle(LED_NUC_PORT, LED_NUC_PIN);
for (i = 0; i < 0x40000; i++) { /* Wait a bit. */
__asm__("NOP");
}
ub_task();
gpio_toggle(LED_NUC_PORT, LED_NUC_PIN);
for (i = 0; i < 0x40000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}
|
