2 * Boiler System Bus Gateway
4 * (c) 2020 Martin Mareš <mj@ucw.cz>
9 #include <libopencm3/cm3/cortex.h>
10 #include <libopencm3/cm3/nvic.h>
11 #include <libopencm3/cm3/systick.h>
12 #include <libopencm3/cm3/scb.h>
13 #include <libopencm3/stm32/rcc.h>
14 #include <libopencm3/stm32/desig.h>
15 #include <libopencm3/stm32/gpio.h>
16 #include <libopencm3/stm32/timer.h>
17 #include <libopencm3/stm32/usart.h>
18 #include <libopencm3/usb/dfu.h>
19 #include <libopencm3/usb/usbd.h>
23 static void clock_init(void)
25 rcc_clock_setup_in_hse_8mhz_out_72mhz();
27 rcc_periph_clock_enable(RCC_GPIOA);
28 rcc_periph_clock_enable(RCC_GPIOB);
29 rcc_periph_clock_enable(RCC_GPIOC);
30 rcc_periph_clock_enable(RCC_USART1);
31 rcc_periph_clock_enable(RCC_USB);
33 rcc_periph_reset_pulse(RST_GPIOA);
34 rcc_periph_reset_pulse(RST_GPIOB);
35 rcc_periph_reset_pulse(RST_GPIOC);
36 rcc_periph_reset_pulse(RST_USART1);
37 rcc_periph_reset_pulse(RST_USB);
40 static void gpio_init(void)
42 // PA9 = TXD1 for debugging console
43 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_ALTFN_PUSHPULL, GPIO9);
45 // PA10 = RXD1 for debugging console
46 gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO10);
48 // PC13 = BluePill LED
49 gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
50 gpio_clear(GPIOC, GPIO13);
53 static volatile u32 ms_ticks;
55 void sys_tick_handler(void)
60 static void tick_init(void)
62 systick_set_frequency(1000, 72000000);
63 systick_counter_enable();
64 systick_interrupt_enable();
67 static void delay_ms(uint ms)
69 u32 start_ticks = ms_ticks;
70 while (ms_ticks - start_ticks < ms)
74 static void usart_init(void)
76 usart_set_baudrate(USART1, 115200);
77 usart_set_databits(USART1, 8);
78 usart_set_stopbits(USART1, USART_STOPBITS_1);
79 usart_set_mode(USART1, USART_MODE_TX_RX);
80 usart_set_parity(USART1, USART_PARITY_NONE);
81 usart_set_flow_control(USART1, USART_FLOWCONTROL_NONE);
86 static const struct usb_device_descriptor device = {
87 .bLength = USB_DT_DEVICE_SIZE,
88 .bDescriptorType = USB_DT_DEVICE,
93 .bMaxPacketSize0 = 64,
100 .bNumConfigurations = 1,
103 static const struct usb_endpoint_descriptor endpoints[] = {{
104 .bLength = USB_DT_ENDPOINT_SIZE,
105 .bDescriptorType = USB_DT_ENDPOINT,
106 .bEndpointAddress = 0x81,
107 .bmAttributes = USB_ENDPOINT_ATTR_BULK,
108 .wMaxPacketSize = 64,
111 .bLength = USB_DT_ENDPOINT_SIZE,
112 .bDescriptorType = USB_DT_ENDPOINT,
113 .bEndpointAddress = 0x82,
114 .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
115 .wMaxPacketSize = 64,
119 static const struct usb_interface_descriptor iface = {
120 .bLength = USB_DT_INTERFACE_SIZE,
121 .bDescriptorType = USB_DT_INTERFACE,
122 .bInterfaceNumber = 0,
123 .bAlternateSetting = 0,
125 .bInterfaceClass = 0xFF,
126 .bInterfaceSubClass = 0,
127 .bInterfaceProtocol = 0,
129 .endpoint = endpoints,
132 static const struct usb_dfu_descriptor dfu_function = {
133 .bLength = sizeof(struct usb_dfu_descriptor),
134 .bDescriptorType = DFU_FUNCTIONAL,
135 .bmAttributes = USB_DFU_CAN_DOWNLOAD | USB_DFU_WILL_DETACH,
136 .wDetachTimeout = 255,
137 .wTransferSize = 1024,
138 .bcdDFUVersion = 0x0100,
141 static const struct usb_interface_descriptor dfu_iface = {
142 .bLength = USB_DT_INTERFACE_SIZE,
143 .bDescriptorType = USB_DT_INTERFACE,
144 .bInterfaceNumber = 1,
145 .bAlternateSetting = 0,
147 .bInterfaceClass = 0xFE,
148 .bInterfaceSubClass = 1,
149 .bInterfaceProtocol = 1,
152 .extra = &dfu_function,
153 .extralen = sizeof(dfu_function),
156 static const struct usb_interface ifaces[] = {{
158 .altsetting = &iface,
161 .altsetting = &dfu_iface,
164 static const struct usb_config_descriptor config = {
165 .bLength = USB_DT_CONFIGURATION_SIZE,
166 .bDescriptorType = USB_DT_CONFIGURATION,
169 .bConfigurationValue = 1,
171 .bmAttributes = 0x80,
172 .bMaxPower = 50, // multiplied by 2 mA
176 static char usb_serial_number[13];
178 static const char *usb_strings[] = {
179 "United Computer Wizards",
184 static byte usb_configured;
185 static uint8_t usbd_control_buffer[64];
187 static enum usbd_request_return_codes control_cb(usbd_device *usbd_dev,
188 struct usb_setup_data *req,
191 void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req) UNUSED)
193 if (req->bmRequestType != 0xc0 || req->bRequest != 0x00)
194 return USBD_REQ_NOTSUPP;
200 debug_printf("USB: Control request\n");
210 return USBD_REQ_HANDLED;
213 static void dfu_detach_complete(usbd_device *dev UNUSED, struct usb_setup_data *req UNUSED)
215 // Reset to bootloader, which implements the rest of DFU
219 static enum usbd_request_return_codes dfu_control_cb(usbd_device *dev UNUSED,
220 struct usb_setup_data *req,
221 uint8_t **buf UNUSED,
222 uint16_t *len UNUSED,
223 void (**complete)(usbd_device *dev, struct usb_setup_data *req))
225 if (req->bmRequestType != 0x21 || req->bRequest != DFU_DETACH)
226 return USBD_REQ_NOTSUPP;
228 *complete = dfu_detach_complete;
229 return USBD_REQ_HANDLED;
232 static void ep81_cb(usbd_device *usbd_dev, uint8_t ep UNUSED)
235 put_u32_be(buf, ms_ticks);
236 usbd_ep_write_packet(usbd_dev, 0x81, buf, sizeof(buf));
237 debug_printf("USB: Bulk write\n");
240 static void set_config_cb(usbd_device *usbd_dev, uint16_t wValue UNUSED)
242 usbd_register_control_callback(usbd_dev, USB_REQ_TYPE_VENDOR, USB_REQ_TYPE_TYPE, control_cb);
243 usbd_register_control_callback(usbd_dev,
244 USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
245 USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
247 usbd_ep_setup(usbd_dev, 0x81, USB_ENDPOINT_ATTR_BULK, 64, ep81_cb);
248 usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
249 ep81_cb(usbd_dev, 0);
253 static void reset_cb(void)
255 debug_printf("USB: Reset\n");
265 desig_get_unique_id_as_dfu(usb_serial_number);
267 debug_printf("Hello, kitty!\n");
269 // Simulate USB disconnect
270 gpio_set_mode(GPIOA, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_OPENDRAIN, GPIO11 | GPIO12);
271 gpio_clear(GPIOA, GPIO11 | GPIO12);
274 usbd_device *usbd_dev = usbd_init(&st_usbfs_v1_usb_driver, &device, &config, usb_strings, ARRAY_SIZE(usb_strings), usbd_control_buffer, sizeof(usbd_control_buffer));
275 usbd_register_reset_callback(usbd_dev, reset_cb);
276 usbd_register_set_config_callback(usbd_dev, set_config_cb);
277 u32 last_ds_step = 0;
280 if (ms_ticks - last_ds_step >= 100) {
282 last_ds_step = ms_ticks;
283 if (usb_configured) {
285 put_u32_be(x, ms_ticks);
286 usbd_ep_write_packet(usbd_dev, 0x82, x, 4);
290 // XXX: libopencm3 usbd does not use interrupts at the moment, need to poll...
291 // wait_for_interrupt();