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-rw-r--r--bluefnorf/usb.c326
1 files changed, 118 insertions, 208 deletions
diff --git a/bluefnorf/usb.c b/bluefnorf/usb.c
index 7894b81..00f363d 100644
--- a/bluefnorf/usb.c
+++ b/bluefnorf/usb.c
@@ -14,7 +14,6 @@
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/gpio.h>
-#include <libopencm3/stm32/timer.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/cdc.h>
#include <libopencm3/cm3/nvic.h>
@@ -31,136 +30,128 @@
#define RX_ECHO 1
#define RX_BUF_LEN 256
-static char _rx_tmp[RX_BUF_LEN];
-static char _rx_buf[RX_BUF_LEN];
+static char rx_tmp[RX_BUF_LEN];
+static char rx_buf[RX_BUF_LEN];
-static size_t _rx_tmp_len;
-static uint8_t _rx_buf_ready;
+static size_t rx_tmp_len;
+static uint8_t rx_buf_ready;
+
+static usbd_device *usbd_dev;
/* Buffer to be used for control requests. */
uint8_t usbd_control_buffer[128];
-static usbd_device* __USBDEV;
-
static const struct usb_device_descriptor device_descriptor = {
- .bLength = USB_DT_DEVICE_SIZE,
- .bDescriptorType = USB_DT_DEVICE,
- .bcdUSB = 0x0200,
- .bDeviceClass = 0xfe, // USB_CLASS_CDC,
- .bDeviceSubClass = 0,
- .bDeviceProtocol = 0,
- .bMaxPacketSize0 = 64,
- .idVendor = 0x1209,
- .idProduct = 0x4001,
- .bcdDevice = 0x0200,
- .iManufacturer = 1,
- .iProduct = 2,
- .iSerialNumber = 3,
- .bNumConfigurations = 1,
+ .bLength = USB_DT_DEVICE_SIZE,
+ .bDescriptorType = USB_DT_DEVICE,
+ .bcdUSB = 0x0200,
+ .bDeviceClass = 0xfe, // USB_CLASS_CDC,
+ .bDeviceSubClass = 0,
+ .bDeviceProtocol = 0,
+ .bMaxPacketSize0 = 64,
+ .idVendor = 0x1209,
+ .idProduct = 0x4001,
+ .bcdDevice = 0x0200,
+ .iManufacturer = 1,
+ .iProduct = 2,
+ .iSerialNumber = 3,
+ .bNumConfigurations = 1,
};
-
static const struct usb_endpoint_descriptor comm_endp[] = {{
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = 0x83,
- .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
- .wMaxPacketSize = 16,
- .bInterval = 255,
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x83,
+ .bmAttributes = USB_ENDPOINT_ATTR_INTERRUPT,
+ .wMaxPacketSize = 16,
+ .bInterval = 255,
}};
-
static const struct usb_endpoint_descriptor data_endp[] = {{
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = 0x01,
- .bmAttributes = USB_ENDPOINT_ATTR_BULK,
- .wMaxPacketSize = 64,
- .bInterval = 1,
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x01,
+ .bmAttributes = USB_ENDPOINT_ATTR_BULK,
+ .wMaxPacketSize = 64,
+ .bInterval = 1,
}, {
- .bLength = USB_DT_ENDPOINT_SIZE,
- .bDescriptorType = USB_DT_ENDPOINT,
- .bEndpointAddress = 0x82,
- .bmAttributes = USB_ENDPOINT_ATTR_BULK,
- .wMaxPacketSize = 64,
- .bInterval = 1,
+ .bLength = USB_DT_ENDPOINT_SIZE,
+ .bDescriptorType = USB_DT_ENDPOINT,
+ .bEndpointAddress = 0x82,
+ .bmAttributes = USB_ENDPOINT_ATTR_BULK,
+ .wMaxPacketSize = 64,
+ .bInterval = 1,
}};
-
static const struct usb_interface_descriptor comm_iface[] = {{
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = 0,
- .bAlternateSetting = 0,
- .bNumEndpoints = 1,
- .bInterfaceClass = 0xfe, // USB_CLASS_CDC,
- .bInterfaceSubClass = 0x00, // USB_CDC_SUBCLASS_ACM,
- .bInterfaceProtocol = 0x00, // USB_CDC_PROTOCOL_AT,
- .iInterface = 0,
-
- .endpoint = comm_endp,
-
- .extra = NULL, // &cdcacm_functional_descriptors,
- .extralen = 0,
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 0,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 1,
+ .bInterfaceClass = 0xfe, // USB_CLASS_CDC,
+ .bInterfaceSubClass = 0x00, // USB_CDC_SUBCLASS_ACM,
+ .bInterfaceProtocol = 0x00, // USB_CDC_PROTOCOL_AT,
+ .iInterface = 0,
+
+ .endpoint = comm_endp,
+
+ .extra = NULL, // &cdcacm_functional_descriptors,
+ .extralen = 0,
}};
static const struct usb_interface_descriptor data_iface[] = {{
- .bLength = USB_DT_INTERFACE_SIZE,
- .bDescriptorType = USB_DT_INTERFACE,
- .bInterfaceNumber = 1,
- .bAlternateSetting = 0,
- .bNumEndpoints = 2,
- .bInterfaceClass = USB_CLASS_DATA,
- .bInterfaceSubClass = 0,
- .bInterfaceProtocol = 0,
- .iInterface = 0,
-
- .endpoint = data_endp,
+ .bLength = USB_DT_INTERFACE_SIZE,
+ .bDescriptorType = USB_DT_INTERFACE,
+ .bInterfaceNumber = 1,
+ .bAlternateSetting = 0,
+ .bNumEndpoints = 2,
+ .bInterfaceClass = USB_CLASS_DATA,
+ .bInterfaceSubClass = 0,
+ .bInterfaceProtocol = 0,
+ .iInterface = 0,
+
+ .endpoint = data_endp,
}};
static const struct usb_interface ifaces[] = {{
- .num_altsetting = 1,
- .altsetting = comm_iface,
+ .num_altsetting = 1,
+ .altsetting = comm_iface,
}, {
- .num_altsetting = 1,
- .altsetting = data_iface,
+ .num_altsetting = 1,
+ .altsetting = data_iface,
}};
static const struct usb_config_descriptor config = {
- .bLength = USB_DT_CONFIGURATION_SIZE,
- .bDescriptorType = USB_DT_CONFIGURATION,
- .wTotalLength = 0,
- .bNumInterfaces = 2,
- .bConfigurationValue = 1,
- .iConfiguration = 0,
- .bmAttributes = 0x80,
- .bMaxPower = 0x32,
-
- .interface = ifaces,
+ .bLength = USB_DT_CONFIGURATION_SIZE,
+ .bDescriptorType = USB_DT_CONFIGURATION,
+ .wTotalLength = 0,
+ .bNumInterfaces = 2,
+ .bConfigurationValue = 1,
+ .iConfiguration = 0,
+ .bmAttributes = 0x80,
+ .bMaxPower = 0x32,
+
+ .interface = ifaces,
};
static const char *usb_strings[] = {
- "Chaos Computer Club Berlin e.V.",
- "bluefnorf",
- "bf1",
+ "Chaos Computer Club Berlin e.V.",
+ "bluefnorf",
+ "bf1",
};
-
-/*
- * Initialize GPIO for D+ and status LED
- */
-void usb_gpio_init()
-{
+void usb_gpio_init() {
// Clock
- rcc_periph_clock_enable(RCC_GPIOA);
- rcc_periph_clock_enable(RCC_GPIOC);
+ rcc_periph_clock_enable(RCC_GPIOA);
+ rcc_periph_clock_enable(RCC_GPIOC);
// D+
- gpio_set_mode(USBD_PORT,
+ gpio_set_mode(USBD_PORT,
GPIO_MODE_OUTPUT_2_MHZ,
- GPIO_CNF_OUTPUT_PUSHPULL,
+ GPIO_CNF_OUTPUT_PUSHPULL,
USBDP);
// LED
@@ -171,90 +162,37 @@ void usb_gpio_init()
}
-/*
- * Switch status led on / off
- */
-inline void usb_status_led_toggle()
-{
+void usb_status_led_toggle() {
gpio_toggle(STATUS_LED_PORT, STATUS_LED_PIN);
}
+static void usb_data_rx_cb(usbd_device *usbd_dev, uint8_t ep) {
+ char buf[64];
-/*
- * Poll usb interface using TIM4
- */
-void usb_timer_init()
-{
- // Enable clock
- rcc_periph_clock_enable(RCC_TIM4);
-
- // Enable interrupts
- nvic_enable_irq(NVIC_TIM4_IRQ);
- nvic_set_priority(NVIC_TIM4_IRQ, 1);
-
- timer_reset(TIM4);
-
- // Edge aligned
- TIM4_CR1 |= TIM_CR1_CKD_CK_INT |
- TIM_CR1_CMS_EDGE |
- TIM_CR1_DIR_UP;
-
- TIM4_PSC = 32;
- TIM4_ARR = 65535;
-
- // Interrupts:
- // - Update / Overflow Event (UIE)
- TIM4_DIER |= TIM_DIER_UIE;
-}
-
-void usb_timer_start()
-{
- TIM4_CR1 |= TIM_CR1_CEN;
-}
-
-
-void tim4_isr()
-{
- // Poll USBDEV
- usbd_poll(__USBDEV);
-
- // Blink status LED
- usb_status_led_toggle();
- TIM4_SR &= ~TIM_SR_UIF; // Clear flag
-}
-
-
-
-static void usb_data_rx_cb(usbd_device *usbd_dev, uint8_t ep)
-{
- char buf[64];
+ int len = usbd_ep_read_packet(usbd_dev, ep, buf, 64);
- int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64);
-
- if (len) {
- // We received data, let's handle it
-
- usbd_ep_write_packet(usbd_dev, 0x82, "fnorf", 6);
- }
+ if (len) {
+ usbd_ep_write_packet(usbd_dev, 0x82, buf, len);
+ }
}
-
-static int usb_control_request_cb(usbd_device *usbd_dev,
- struct usb_setup_data *req,
- uint8_t **buf,
- uint16_t *len,
- usbd_control_complete_callback *complete)
-{
+static enum usbd_request_return_codes usb_control_request_cb(usbd_device *usbd_dev, struct usb_setup_data *req,
+ uint8_t **buf, uint16_t *len, usbd_control_complete_callback *complete) {
+ (void)usbd_dev;
+ (void)req;
+ (void)buf;
+ (void)len;
+ (void)complete;
return 0;
}
-static void usb_set_config_cb(usbd_device *usbd_dev, uint16_t wValue)
-{
- usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, usb_data_rx_cb);
- usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
- usbd_ep_setup(usbd_dev, 0x83, USB_ENDPOINT_ATTR_INTERRUPT, 16, NULL);
+static void usb_set_config_cb(usbd_device *usbd_dev, uint16_t wValue) {
+ (void)wValue;
+
+ usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, usb_data_rx_cb);
+ usbd_ep_setup(usbd_dev, 0x82, USB_ENDPOINT_ATTR_BULK, 64, NULL);
- usbd_register_control_callback(
+ usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
@@ -262,70 +200,42 @@ static void usb_set_config_cb(usbd_device *usbd_dev, uint16_t wValue)
);
}
-
-usbd_device *usb_serial_init()
-{
- usbd_device *usbd_dev;
-
+usbd_device *usb_serial_init() {
// Initialize GPIO
usb_gpio_init();
- // Initialize timers
- usb_timer_init();
-
// Initialize buffers
- memset(_rx_tmp, 0, RX_BUF_LEN);
- memset(_rx_buf, 0, RX_BUF_LEN);
+ memset(rx_tmp, 0, RX_BUF_LEN);
+ memset(rx_buf, 0, RX_BUF_LEN);
- _rx_tmp_len = 0;
- _rx_buf_ready = 0;
+ rx_tmp_len = 0;
+ rx_buf_ready = 0;
// Pull down D+
gpio_clear(USBD_PORT, USBDP);
- for (int i = 0; i < 0x10000; i++) {
- __asm__("nop");
+ for (int i = 0; i < 0x10000; i++) {
+ __asm__("nop");
}
gpio_set(USBD_PORT, USBDP);
// Initialize usb device
- usbd_dev = usbd_init(&st_usbfs_v1_usb_driver,
+ usbd_dev = usbd_init(&st_usbfs_v1_usb_driver,
&device_descriptor,
&config,
usb_strings, 3,
usbd_control_buffer, sizeof(usbd_control_buffer));
- usbd_register_set_config_callback(usbd_dev, usb_set_config_cb);
-
- // Make available
- __USBDEV = usbd_dev;
+ usbd_register_set_config_callback(usbd_dev, usb_set_config_cb);
// Pull down
gpio_clear(USBD_PORT, USBDP);
- // Poll a bit
- for (int i = 0; i < 0x80000; i++) {
- usbd_poll(usbd_dev);
- }
-
- // Start polling
- usb_timer_start();
+ nvic_enable_irq(NVIC_USB_LP_CAN_RX0_IRQ);
return usbd_dev;
}
-
-/*
- * Override _write and redirect stdout to usb
- */
- /*
-int _write(int file, char* data, int len)
-{
- if (file < 2) {
- return usb_serial_tx(data, len);
- }
-
- // Set error and return failure
- errno = EIO;
- return -1;
+void usb_lp_can_rx0_isr() {
+ usbd_poll(usbd_dev);
+ nvic_clear_pending_irq(NVIC_USB_LP_CAN_RX0_IRQ);
}
-*/