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
79
|
/*
* Feb 2017 Karl Palsson <karlp@tweak.net.au>
*/
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libopencm3/cm3/nvic.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/i2c.h>
#include <libopencm3/stm32/rcc.h>
#include "trace.h"
#include "hw.h"
#include "i2c-master.h"
#define LED_DISCO_GREEN_PORT GPIOD
#define LED_DISCO_GREEN_PIN GPIO12
struct hw_detail hw_details = {
.periph = I2C1,
.periph_rcc = RCC_I2C1,
.periph_rst = RST_I2C1,
.pins = GPIO8 | GPIO9, /* our external i2c device on I2c1 */
.port = GPIOB,
.port_rcc = RCC_GPIOB,
.trigger_rcc = RCC_GPIOB,
.trigger_port = GPIOB,
.trigger_pin = GPIO13,
};
/* provided in board files please*/
/**
* Setup any gpios or anything hardware specific.
* Should _only_ be things that can't be done in shared i2cm_init!
*/
static void i2cm_hw_init(void)
{
/* trigger pin gpio */
rcc_periph_clock_enable(hw_details.trigger_rcc);
gpio_mode_setup(hw_details.trigger_port, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, hw_details.trigger_pin);
/* i2c control lines */
rcc_periph_clock_enable(hw_details.port_rcc);
gpio_mode_setup(hw_details.port, GPIO_MODE_AF, GPIO_PUPD_NONE, hw_details.pins);
gpio_set_output_options(hw_details.port, GPIO_OTYPE_OD, GPIO_OSPEED_50MHZ, hw_details.pins);
gpio_set_af(hw_details.port, GPIO_AF4, hw_details.pins);
}
static void setup(void)
{
printf("hi guys!\n");
i2cm_hw_init();
i2cm_init();
}
int main(void)
{
int i, j;
rcc_clock_setup_hse_3v3(&rcc_hse_8mhz_3v3[RCC_CLOCK_3V3_168MHZ]);
/* green led for ticking */
rcc_periph_clock_enable(RCC_GPIOD);
gpio_mode_setup(LED_DISCO_GREEN_PORT, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE,
LED_DISCO_GREEN_PIN);
setup();
while (1) {
i2cm_task();
gpio_toggle(LED_DISCO_GREEN_PORT, LED_DISCO_GREEN_PIN);
for (i = 0; i < 0x800000; i++) { /* Wait a bit. */
__asm__("NOP");
}
}
return 0;
}
|
