test-opencm3/test.c

   1 #include "util.h"
   2 #include "ds18b20.h"
   3
   4 #include <libopencm3/cm3/nvic.h>
   5 #include <libopencm3/cm3/systick.h>
   6 #include <libopencm3/stm32/rcc.h>
   7 #include <libopencm3/stm32/gpio.h>
   8 #include <libopencm3/stm32/usart.h>
   9
  10 static void clock_setup(void)
  11 {
  12         rcc_clock_setup_in_hse_8mhz_out_72mhz();
  13
  14         rcc_periph_clock_enable(RCC_GPIOA);
  15         rcc_periph_clock_enable(RCC_GPIOC);
  16         rcc_periph_clock_enable(RCC_USART1);
  17         rcc_periph_clock_enable(RCC_TIM3);
  18         rcc_periph_clock_enable(RCC_DMA1);
  19 }
  20
  21 static void gpio_setup(void)
  22 {
  23         gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
  24 }
  25
  26 static volatile u32 ms_ticks;
  27
  28 void sys_tick_handler(void)
  29 {
  30         ms_ticks++;
  31 }
  32
  33 static void tick_setup(void)
  34 {
  35         systick_set_frequency(1000, 72000000);
  36         systick_counter_enable();
  37         systick_interrupt_enable();
  38 }
  39
  40 static void delay_ms(uint ms)
  41 {
  42         u32 start_ticks = ms_ticks;
  43         while (ms_ticks - start_ticks < ms)
  44                 ;
  45 }
  46
  47 static void usart_setup(void)
  48 {
  49         gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
  50
  51         usart_set_baudrate(USART1, 115200);
  52         usart_set_databits(USART1, 8);
  53         usart_set_stopbits(USART1, USART_STOPBITS_1);
  54         usart_set_mode(USART1, USART_MODE_TX);
  55         usart_set_parity(USART1, USART_PARITY_NONE);
  56         usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
  57
  58         usart_enable(USART1);
  59 }
  60
  61 static void show_temperature(void)
  62 {
  63         debug_putc('#');
  64         for (uint i=0; ds_sensors[i].address[0]; i++) {
  65                 debug_putc(' ');
  66                 int t = ds_sensors[i].current_temp;
  67                 if (t == DS_TEMP_UNKNOWN)
  68                         debug_puts("---.---");
  69                 else
  70                         debug_printf("%3d.%03d", t / 1000, t % 1000);
  71         }
  72         debug_puts("\r\n");
  73 }
  74
  75 int main(void)
  76 {
  77         clock_setup();
  78         gpio_setup();
  79         tick_setup();
  80         usart_setup();
  81
  82         ds_init();
  83
  84         byte cycles = 0;
  85         for (;;) {
  86                 gpio_toggle(GPIOC, GPIO13);
  87                 delay_ms(100);
  88                 ds_step();
  89                 if (cycles++ >= 50) {
  90                         cycles = 0;
  91                         show_temperature();
  92                 }
  93         }
  94
  95         return 0;
  96 }