flabbergast's ARM/STM32 examples using libopencm3
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/*
* This file is part of the libopencm3 project.
*
* Copyright (C) 2010 Gareth McMullin <gareth@blacksphere.co.nz>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <libopencm3/stm32/rcc.h>
#include <libopencm3/stm32/flash.h>
#include <libopencm3/stm32/gpio.h>
#include <libopencm3/stm32/syscfg.h>
#include <libopencm3/stm32/crs.h>
#include <libopencm3/usb/usbd.h>
#include <libopencm3/usb/cdc.h>
static const struct usb_device_descriptor dev = {
.bLength = USB_DT_DEVICE_SIZE,
.bDescriptorType = USB_DT_DEVICE,
.bcdUSB = 0x0200,
.bDeviceClass = USB_CLASS_CDC,
.bDeviceSubClass = 0,
.bDeviceProtocol = 0,
.bMaxPacketSize0 = 64,
.idVendor = 0x0483,
.idProduct = 0x5740,
.bcdDevice = 0x0200,
.iManufacturer = 1,
.iProduct = 2,
.iSerialNumber = 3,
.bNumConfigurations = 1,
};
/*
* This notification endpoint isn't implemented. According to CDC spec its
* optional, but its absence causes a NULL pointer dereference in Linux
* cdc_acm driver.
*/
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,
}};
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 = 0x82,
.bmAttributes = USB_ENDPOINT_ATTR_BULK,
.wMaxPacketSize = 64,
.bInterval = 1,
}};
static const struct {
struct usb_cdc_header_descriptor header;
struct usb_cdc_call_management_descriptor call_mgmt;
struct usb_cdc_acm_descriptor acm;
struct usb_cdc_union_descriptor cdc_union;
} __attribute__((packed)) cdcacm_functional_descriptors = {
.header = {
.bFunctionLength = sizeof(struct usb_cdc_header_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_HEADER,
.bcdCDC = 0x0110,
},
.call_mgmt = {
.bFunctionLength =
sizeof(struct usb_cdc_call_management_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_CALL_MANAGEMENT,
.bmCapabilities = 0,
.bDataInterface = 1,
},
.acm = {
.bFunctionLength = sizeof(struct usb_cdc_acm_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_ACM,
.bmCapabilities = 0,
},
.cdc_union = {
.bFunctionLength = sizeof(struct usb_cdc_union_descriptor),
.bDescriptorType = CS_INTERFACE,
.bDescriptorSubtype = USB_CDC_TYPE_UNION,
.bControlInterface = 0,
.bSubordinateInterface0 = 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 = USB_CLASS_CDC,
.bInterfaceSubClass = USB_CDC_SUBCLASS_ACM,
.bInterfaceProtocol = USB_CDC_PROTOCOL_AT,
.iInterface = 0,
.endpoint = comm_endp,
.extra = &cdcacm_functional_descriptors,
.extralen = sizeof(cdcacm_functional_descriptors)
}};
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,
}};
static const struct usb_interface ifaces[] = {{
.num_altsetting = 1,
.altsetting = comm_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,
};
static const char *usb_strings[] = {
"flabbergast",
"CDC-ACM Test",
"DeMo",
};
/* Buffer to be used for control requests. */
uint8_t usbd_control_buffer[128];
/* Aux functions */
static void led_flip(void) {
if(GPIOA_IDR & (1<<15)) {
GPIOA_BRR = GPIO15;
} else {
GPIOA_BSRR = GPIO15;
}
}
static int cdcacm_control_request(usbd_device *usbd_dev,
struct usb_setup_data *req, uint8_t **buf, uint16_t *len,
void (**complete)(usbd_device *usbd_dev, struct usb_setup_data *req))
{
(void)complete;
(void)buf;
(void)usbd_dev;
switch(req->bRequest) {
case USB_CDC_REQ_SET_CONTROL_LINE_STATE: {
/*
* This Linux cdc_acm driver requires this to be implemented
* even though it's optional in the CDC spec, and we don't
* advertise it in the ACM functional descriptor.
*/
char local_buf[10];
struct usb_cdc_notification *notif = (void *)local_buf;
/* We echo signals back to host as notification. */
notif->bmRequestType = 0xA1;
notif->bNotification = USB_CDC_NOTIFY_SERIAL_STATE;
notif->wValue = 0;
notif->wIndex = 0;
notif->wLength = 2;
local_buf[8] = req->wValue & 3;
local_buf[9] = 0;
// usbd_ep_write_packet(0x83, buf, 10);
return 1;
}
case USB_CDC_REQ_SET_LINE_CODING:
if(*len < sizeof(struct usb_cdc_line_coding))
return 0;
return 1;
}
return 0;
}
static void cdcacm_data_rx_cb(usbd_device *usbd_dev, uint8_t ep)
{
(void)ep;
char buf[64];
int len = usbd_ep_read_packet(usbd_dev, 0x01, buf, 64);
if (len) {
usbd_ep_write_packet(usbd_dev, 0x82, buf, len);
buf[len] = 0;
led_flip();
}
}
static void cdcacm_set_config(usbd_device *usbd_dev, uint16_t wValue)
{
(void)wValue;
usbd_ep_setup(usbd_dev, 0x01, USB_ENDPOINT_ATTR_BULK, 64, cdcacm_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);
usbd_register_control_callback(
usbd_dev,
USB_REQ_TYPE_CLASS | USB_REQ_TYPE_INTERFACE,
USB_REQ_TYPE_TYPE | USB_REQ_TYPE_RECIPIENT,
cdcacm_control_request);
}
int main(void)
{
usbd_device *usbd_dev;
#if defined(BOOTLOADER8K)
# define SCB_VTOR MMIO32(0xE000ED08)
SCB_VTOR = (uint32_t) 0x08002000;
#endif
#if defined(STM32F0)
rcc_clock_setup_in_hsi_out_48mhz();
crs_autotrim_usb_enable();
rcc_set_usbclk_source(RCC_HSI48);
// this is needed for F042 in TSSOP-20 package; USB is on shared pins
//rcc_periph_clock_enable(RCC_SYSCFG_COMP);
//SYSCFG_CFGR1 |= SYSCFG_CFGR1_PA11_PA12_RMP;
#elif defined(STM32L0)
// libopencm3 clock setup can be a bit ad-hoc, so let's configure manually
// 32MHz, PLL supplied by the internal HSI16 oscillator
/* Set the flash latency */
FLASH_ACR |= FLASH_ACR_LATENCY_1WS;
/* Turn on HSI16 */
RCC_CR |= RCC_CR_HSI16ON;
while ((RCC_CR & RCC_CR_HSI16RDY) == 0);
/* Make sure PLL is off (it should be after reset, but ...) */
RCC_CR &= ~RCC_CR_PLLON;
while (RCC_CR & RCC_CR_PLLRDY);
/* Set the PLL source to HSI16 */
RCC_CFGR &= ~(1<<16); // RCC_CFGR_PLLSRC
/* Set up the PLL */
uint32_t reg = RCC_CFGR
& ~( (RCC_CFGR_PLLMUL_MASK << RCC_CFGR_PLLMUL_SHIFT)
| (RCC_CFGR_PLLDIV_MASK << RCC_CFGR_PLLDIV_SHIFT));
RCC_CFGR = reg | (RCC_CFGR_PLLMUL_MUL4 << RCC_CFGR_PLLMUL_SHIFT)
| (RCC_CFGR_PLLDIV_DIV2 << RCC_CFGR_PLLDIV_SHIFT);
/* Turn on PLL and switch to it */
RCC_CR |= RCC_CR_PLLON;
while ((RCC_CR & RCC_CR_PLLRDY) == 0);
RCC_CFGR |= RCC_CFGR_SW_PLL;
/* Set the peripheral clock frequencies used. */
rcc_ahb_frequency = 32000000;
rcc_apb1_frequency = 32000000;
rcc_apb2_frequency = 32000000;
// end of manual clock configuration
// Enable VREFINT reference for HSI48
rcc_periph_clock_enable(RCC_SYSCFG);
SYSCFG_CFGR3 |= SYSCFG_CFGR3_ENREF_HSI48;
rcc_set_hsi48_source_rc48();
crs_autotrim_usb_enable();
rcc_osc_on(RCC_HSI48);
rcc_wait_for_osc_ready(RCC_HSI48);
/* MCO on PA9, to verify MCU speed with a scope */
gpio_mode_setup(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE, GPIO9);
gpio_set_af(GPIOA, GPIO_AF0, GPIO9);
RCC_CFGR |= (RCC_CFGR_MCO_SYSCLK << RCC_CFGR_MCO_SHIFT) | (RCC_CFGR_MCOPRE_DIV16 << 28);
#else
#error "Edit the sources and do the clock setup!"
#endif
rcc_periph_clock_enable(RCC_GPIOA);
gpio_mode_setup(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO15); // LED
gpio_mode_setup(GPIOA, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO1); // button, has external pull-down
usbd_dev = usbd_init(&st_usbfs_v2_usb_driver, &dev, &config, usb_strings, 3, usbd_control_buffer, sizeof(usbd_control_buffer));
usbd_register_set_config_callback(usbd_dev, cdcacm_set_config);
char greeting[16] = "hello, world\r\n";
while (1) {
usbd_poll(usbd_dev);
if (gpio_get(GPIOA, GPIO1)) {
usbd_ep_write_packet(usbd_dev, 0x82, greeting, 15);
for (uint32_t i = 0; i < 2000000; i++) { /* Wait a bit, cheap "debounce" */
__asm__("nop");
}
}
}
}
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