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         // PC13 = BluePill LED
  24         gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
  25         gpio_clear(GPIOC, GPIO13);
  26
  27         // PC14 = bypass LED*
  28         gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO14);
  29         gpio_set(GPIOC, GPIO14);
  30
  31         // PC15 = bypass opto-coupler
  32         gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO15);
  33         gpio_clear(GPIOC, GPIO15);
  34 }
  35
  36 static volatile u32 ms_ticks;
  37
  38 void sys_tick_handler(void)
  39 {
  40         ms_ticks++;
  41 }
  42
  43 static void tick_setup(void)
  44 {
  45         systick_set_frequency(1000, 72000000);
  46         systick_counter_enable();
  47         systick_interrupt_enable();
  48 }
  49
  50 static void delay_ms(uint ms)
  51 {
  52         u32 start_ticks = ms_ticks;
  53         while (ms_ticks - start_ticks < ms)
  54                 ;
  55 }
  56
  57 static void usart_setup(void)
  58 {
  59         gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO_USART1_TX);
  60
  61         usart_set_baudrate(USART1, 115200);
  62         usart_set_databits(USART1, 8);
  63         usart_set_stopbits(USART1, USART_STOPBITS_1);
  64         usart_set_mode(USART1, USART_MODE_TX_RX);
  65         usart_set_parity(USART1, USART_PARITY_NONE);
  66         usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
  67
  68         usart_enable(USART1);
  69 }
  70
  71 static bool bypass_active;
  72
  73 static void show_temperature(void)
  74 {
  75         debug_putc('#');
  76         for (uint i=0; ds_sensors[i].address[0]; i++) {
  77                 debug_putc(' ');
  78                 int t = ds_sensors[i].current_temp;
  79                 if (t == DS_TEMP_UNKNOWN)
  80                         debug_puts("---.---");
  81                 else
  82                         debug_printf("%3d.%03d", t / 1000, t % 1000);
  83         }
  84         debug_putc(' ');
  85         debug_putc('0' + bypass_active);
  86         debug_puts("\r\n");
  87 }
  88
  89 int main(void)
  90 {
  91         clock_setup();
  92         gpio_setup();
  93         tick_setup();
  94         usart_setup();
  95
  96         ds_init();
  97
  98         byte cycles = 0;
  99         for (;;) {
 100                 gpio_toggle(GPIOC, GPIO13);
 101                 delay_ms(100);
 102                 ds_step();
 103                 if (usart_get_flag(USART1, USART_SR_RXNE)) {
 104                         uint ch = usart_recv(USART1);
 105                         if (ch == 'B') {
 106                                 bypass_active = 1;
 107                                 gpio_set(GPIOC, GPIO15);        // opto-coupler
 108                                 gpio_clear(GPIOC, GPIO14);      // LED
 109                         } else if (ch == 'b') {
 110                                 bypass_active = 0;
 111                                 gpio_clear(GPIOC, GPIO15);      // opto-coupler
 112                                 gpio_set(GPIOC, GPIO14);        // LED
 113                         }
 114                 }
 115                 if (cycles++ >= 50) {
 116                         cycles = 0;
 117                         show_temperature();
 118                 }
 119         }
 120
 121         return 0;
 122 }