CuVoodoo STM32F1 firmware template
global.c
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1 /* This program is free software: you can redistribute it and/or modify
2  * it under the terms of the GNU General Public License as published by
3  * the Free Software Foundation, either version 3 of the License, or
4  * (at your option) any later version.
5  *
6  * This program is distributed in the hope that it will be useful,
7  * but WITHOUT ANY WARRANTY; without even the implied warranty of
8  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
9  * GNU General Public License for more details.
10  *
11  * You should have received a copy of the GNU General Public License
12  * along with this program. If not, see <http://www.gnu.org/licenses/>.
13  *
14  */
20 /* standard libraries */
21 #include <stdint.h> // standard integer types
22 #include <stdlib.h> // general utilities
23 
24 /* STM32 (including CM3) libraries */
25 #include <libopencm3/stm32/rcc.h> // real-time control clock library
26 #include <libopencm3/stm32/gpio.h> // general purpose input output library
27 #include <libopencm3/stm32/timer.h> // timer library
28 #include <libopencm3/cm3/nvic.h> // interrupt handler
29 #include <libopencm3/stm32/exti.h> // external interrupt defines
30 
31 #include "global.h" // common methods
32 #include "string.h" // memory utilities
33 
34 volatile bool button_flag = false;
35 
36 char* b2s(uint64_t binary, uint8_t rjust)
37 {
38  static char string[64+1] = {0}; // the string representation to return
39  uint8_t bit = LENGTH(string)-1; // the index of the bit to print
40  string[bit--] = '\0'; // terminate string
41 
42  while (binary) {
43  if (binary & 1) {
44  string[bit--] = '1';
45  } else {
46  string[bit--] = '0';
47  }
48  binary >>= 1;
49  }
50 
51  while (64-bit-1<rjust && bit>0) {
52  string[bit--] = '0';
53  }
54 
55  return string;
56 }
57 
59 void led_on(void)
60 {
61 #if defined(SYSTEM_BOARD) || defined(BLUE_PILL) || defined(CORE_BOARD)
62  gpio_clear(GPIO(LED_PORT), GPIO(LED_PIN));
63 #elif defined(MAPLE_MINI)
64  gpio_set(GPIO(LED_PORT), GPIO(LED_PIN));
65 #endif
66 }
68 void led_off(void)
69 {
70 #if defined(SYSTEM_BOARD) || defined(BLUE_PILL) || defined(CORE_BOARD)
71  gpio_set(GPIO(LED_PORT), GPIO(LED_PIN));
72 #elif defined(MAPLE_MINI)
73  gpio_clear(GPIO(LED_PORT), GPIO(LED_PIN));
74 #endif
75 }
77 void led_toggle(void)
78 {
79  gpio_toggle(GPIO(LED_PORT), GPIO(LED_PIN));
80 }
81 
82 void board_setup(void)
83 {
84  // setup LED
85  rcc_periph_clock_enable(RCC_GPIO(LED_PORT)); // enable clock for LED
86  gpio_set_mode(GPIO(LED_PORT), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO(LED_PIN)); // set LED pin to 'output push-pull'
87  led_off(); // switch off LED per default
88 
89  // setup button
90 #if defined(BUTTON_PORT) && defined(BUTTON_PIN)
91  rcc_periph_clock_enable(RCC_GPIO(BUTTON_PORT)); // enable clock for button
92  gpio_set_mode(GPIO(BUTTON_PORT), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO(BUTTON_PIN)); // set button pin to input
93  rcc_periph_clock_enable(RCC_AFIO); // enable alternate function clock for external interrupt
94  exti_select_source(EXTI(BUTTON_PIN), GPIO(BUTTON_PORT)); // mask external interrupt of this pin only for this port
95 #if defined(MAPLE_MINI)
96  gpio_clear(GPIO(BUTTON_PORT), GPIO(BUTTON_PIN)); // pull down to be able to detect button push (go high)
97  exti_set_trigger(EXTI(BUTTON_PIN), EXTI_TRIGGER_RISING); // trigger when button is pressed
98 #elif defined(CORE_BOARD)
99  gpio_set(GPIO(BUTTON_PORT), GPIO(BUTTON_PIN)); // pull up to be able to detect button push (go low)
100  exti_set_trigger(EXTI(BUTTON_PIN), EXTI_TRIGGER_FALLING); // trigger when button is pressed
101 #endif
102  exti_enable_request(EXTI(BUTTON_PIN)); // enable external interrupt
103  nvic_enable_irq(NVIC_EXTI_IRQ(BUTTON_PIN)); // enable interrupt
104 #endif
105 }
106 
107 #if defined(BUTTON_PIN)
108 
109 void EXTI_ISR(BUTTON_PIN)(void)
110 {
111  exti_reset_request(EXTI(BUTTON_PIN)); // reset interrupt
112  button_flag = true; // perform button action
113 }
114 #endif
void board_setup(void)
setup board peripherals
Definition: global.c:82
#define RCC_GPIO(x)
get RCC for GPIO based on GPIO identifier
Definition: global.h:41
void led_off(void)
switch off board LED
Definition: global.c:68
#define NVIC_EXTI_IRQ(x)
get NVIC IRQ for external interrupt base on external interrupt/pin
Definition: global.h:92
global definitions and methods (API)
#define GPIO(x)
get GPIO based on GPIO identifier
Definition: global.h:39
char * b2s(uint64_t binary, uint8_t rjust)
get binary representation of a number
Definition: global.c:36
#define EXTI(x)
get external interrupt based on pin identifier
Definition: global.h:90
volatile bool button_flag
flag set when board user button has been pressed/released
Definition: global.c:34
#define EXTI_ISR(x)
get interrupt service routine for timer base on external interrupt/pin
Definition: global.h:105
#define LENGTH(x)
get the length of an array
Definition: global.h:26
void led_toggle(void)
toggle board LED
Definition: global.c:77
void led_on(void)
switch on board LED
Definition: global.c:59