bsb/firmware/main.c

   1 /*
   2  *      Boiler System Bus Gateway
   3  *
   4  *      (c) 2020 Martin Mareš <mj@ucw.cz>
   5  */
   6
   7 #include "util.h"
   8
   9 #include <libopencm3/cm3/nvic.h>
  10 #include <libopencm3/cm3/systick.h>
  11 #include <libopencm3/stm32/rcc.h>               // FIXME: Clean up
  12 #include <libopencm3/stm32/gpio.h>
  13 #include <libopencm3/stm32/timer.h>
  14 #include <libopencm3/stm32/usart.h>
  15 #include <libopencm3/usb/usbd.h>
  16
  17 #include <string.h>
  18
  19 static void clock_init(void)
  20 {
  21         rcc_clock_setup_in_hse_8mhz_out_72mhz();
  22
  23         rcc_periph_clock_enable(RCC_GPIOA);
  24         rcc_periph_clock_enable(RCC_GPIOB);
  25         rcc_periph_clock_enable(RCC_GPIOC);
  26         rcc_periph_clock_enable(RCC_USART1);
  27         rcc_periph_clock_enable(RCC_USB);
  28
  29         rcc_periph_reset_pulse(RST_GPIOA);
  30         rcc_periph_reset_pulse(RST_GPIOB);
  31         rcc_periph_reset_pulse(RST_GPIOC);
  32         rcc_periph_reset_pulse(RST_USART1);
  33         rcc_periph_reset_pulse(RST_USB);
  34 }
  35
  36 static void gpio_init(void)
  37 {
  38         // PA9 = TXD1 for debugging console
  39         gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
  40
  41         // PA10 = RXD1 for debugging console
  42         gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO10);
  43
  44         // PC13 = BluePill LED
  45         gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
  46         gpio_clear(GPIOC, GPIO13);
  47 }
  48
  49 static volatile u32 ms_ticks;
  50
  51 void sys_tick_handler(void)
  52 {
  53         ms_ticks++;
  54 }
  55
  56 static void tick_init(void)
  57 {
  58         systick_set_frequency(1000, 72000000);
  59         systick_counter_enable();
  60         systick_interrupt_enable();
  61 }
  62
  63 static void delay_ms(uint ms)
  64 {
  65         u32 start_ticks = ms_ticks;
  66         while (ms_ticks - start_ticks < ms)
  67                 ;
  68 }
  69
  70 static void usart_init(void)
  71 {
  72         usart_set_baudrate(USART1, 115200);
  73         usart_set_databits(USART1, 8);
  74         usart_set_stopbits(USART1, USART_STOPBITS_1);
  75         usart_set_mode(USART1, USART_MODE_TX_RX);
  76         usart_set_parity(USART1, USART_PARITY_NONE);
  77         usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
  78
  79         usart_enable(USART1);
  80 }
  81
  82 static const struct usb_device_descriptor dev = {
  83         .bLength = USB_DT_DEVICE_SIZE,
  84         .bDescriptorType = USB_DT_DEVICE,
  85         .bcdUSB = 0x0200,
  86         .bDeviceClass = 0xFF,
  87         .bDeviceSubClass = 0,
  88         .bDeviceProtocol = 0,
  89         .bMaxPacketSize0 = 64,
  90         .idVendor = 0x4242,
  91         .idProduct = 0x0003,
  92         .bcdDevice = 0x0200,
  93         .iManufacturer = 1,
  94         .iProduct = 2,
  95         .iSerialNumber = 3,
  96         .bNumConfigurations = 1,
  97 };
  98
  99 static const struct usb_endpoint_descriptor endpoints[] = {{
 100         .bLength = USB_DT_ENDPOINT_SIZE,
 101         .bDescriptorType = USB_DT_ENDPOINT,
 102         .bEndpointAddress = 0x81,
 103         .bmAttributes = USB_ENDPOINT_ATTR_BULK,
 104         .wMaxPacketSize = 64,
 105         .bInterval = 1,
 106 },{
 107         .bLength = USB_DT_ENDPOINT_SIZE,
 108         .bDescriptorType = USB_DT_ENDPOINT,
 109         .bEndpointAddress = 0x82,
 110         .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
 111         .wMaxPacketSize = 64,
 112         .bInterval = 1,
 113 }};
 114
 115 static const struct usb_interface_descriptor iface = {
 116         .bLength = USB_DT_INTERFACE_SIZE,
 117         .bDescriptorType = USB_DT_INTERFACE,
 118         .bInterfaceNumber = 0,
 119         .bAlternateSetting = 0,
 120         .bNumEndpoints = 2,
 121         .bInterfaceClass = 0xFF,
 122         .bInterfaceSubClass = 0,
 123         .bInterfaceProtocol = 0,
 124         .iInterface = 0,
 125         .endpoint = endpoints,
 126 };
 127
 128 static const struct usb_interface ifaces[] = {{
 129         .num_altsetting = 1,
 130         .altsetting = &iface,
 131 }};
 132
 133 static const struct usb_config_descriptor config = {
 134         .bLength = USB_DT_CONFIGURATION_SIZE,
 135         .bDescriptorType = USB_DT_CONFIGURATION,
 136         .wTotalLength = 0,
 137         .bNumInterfaces = 1,
 138         .bConfigurationValue = 1,
 139         .iConfiguration = 0,
 140         .bmAttributes = 0x80,
 141         .bMaxPower = 50,        // multiplied by 2 mA
 142         .interface = ifaces,
 143 };
 144
 145 static const char *usb_strings[] = {
 146         "United Computer Wizards",
 147         "BSB Gateway",
 148         "1",
 149 };
 150
 151 static byte usb_configured;
 152 static uint8_t usbd_control_buffer[64];
 153
 154 static enum usbd_request_return_codes control_cb(usbd_device *usbd_dev,
 155         struct usb_setup_data *req,
 156         uint8_t **buf,
 157         uint16_t *len,
 158         void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req) UNUSED)
 159 {
 160         if (req->bmRequestType != 0xc0 || req->bRequest != 0x00)
 161                 return USBD_REQ_NOTSUPP;
 162
 163         (void) usbd_dev;
 164         (void) buf;
 165         (void) len;
 166         (void) complete;
 167         debug_printf("USB: Control request\n");
 168
 169         byte *b = *buf;
 170         b[0] = 0x12;
 171         b[1] = 0x34;
 172         b[2] = 0x56;
 173         b[3] = 0x78;
 174         if (*len > 4)
 175                 *len = 4;
 176
 177         return USBD_REQ_HANDLED;
 178 }
 179
 180 static void ep81_cb(usbd_device *usbd_dev, uint8_t ep UNUSED)
 181 {
 182         byte buf[4];
 183         put_u32_be(buf, ms_ticks);
 184         usbd_ep_write_packet(usbd_dev, 0x81, buf, sizeof(buf));
 185         debug_printf("USB: Bulk write\n");
 186 }
 187
 188 static void set_config_cb(usbd_device *usbd_dev, uint16_t wValue UNUSED)
 189 {
 190         usbd_register_control_callback(usbd_dev, USB_REQ_TYPE_VENDOR, USB_REQ_TYPE_TYPE, control_cb);
 191         usbd_ep_setup(usbd_dev, 0x81, USB_ENDPOINT_ATTR_BULK, 64, ep81_cb);
 192         usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
 193         ep81_cb(usbd_dev, 0);
 194         usb_configured = 1;
 195 }
 196
 197 static void reset_cb(void)
 198 {
 199         debug_printf("USB: Reset\n");
 200         usb_configured = 0;
 201 }
 202
 203 int main(void)
 204 {
 205         clock_init();
 206         gpio_init();
 207         tick_init();
 208         usart_init();
 209
 210         debug_printf("Hello, kitty!\n");
 211
 212         // Simulate USB disconnect
 213         gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO11 | GPIO12);
 214         gpio_clear(GPIOA, GPIO11 | GPIO12);
 215         delay_ms(1000);
 216
 217         usbd_device *usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &dev, &config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer));
 218         usbd_register_reset_callback(usbd_dev, reset_cb);
 219         usbd_register_set_config_callback(usbd_dev, set_config_cb);
 220         u32 last_ds_step = 0;
 221
 222         for (;;) {
 223                 if (ms_ticks - last_ds_step >= 100) {
 224                         debug_led_toggle();
 225                         last_ds_step = ms_ticks;
 226                         if (usb_configured) {
 227                                 byte x[4];
 228                                 put_u32_be(x, ms_ticks);
 229                                 usbd_ep_write_packet(usbd_dev, 0x82, x, 4);
 230                         }
 231                 }
 232
 233                 // XXX: libopencm3 usbd does not use interrupts at the moment, need to poll...
 234                 // wait_for_interrupt();
 235                 usbd_poll(usbd_dev);
 236         }
 237
 238         return 0;
 239 }