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// Hardware interface to USB on AVR at90usb
//
// Copyright (C) 2018 Kevin O'Connor <kevin@koconnor.net>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <avr/interrupt.h> // USB_COM_vect
#include <string.h> // NULL
#include "autoconf.h" // CONFIG_MACH_at90usb1286
#include "board/usb_cdc.h" // usb_notify_ep0
#include "board/usb_cdc_ep.h" // USB_CDC_EP_BULK_IN
#include "pgm.h" // READP
#include "sched.h" // DECL_INIT
// EPCFG0X definitions
#define EP_TYPE_CONTROL 0x00
#define EP_TYPE_BULK_IN 0x81
#define EP_TYPE_BULK_OUT 0x80
#define EP_TYPE_INTERRUPT_IN 0xC1
// EPCFG1X definitions
#define EP_SINGLE_BUFFER 0x02
#define EP_DOUBLE_BUFFER 0x06
#define EP_SIZE(s) ((s)==64 ? 0x30 : ((s)==32 ? 0x20 : ((s)==16 ? 0x10 : 0x00)))
static void
usb_write_packet(const uint8_t *data, uint8_t len)
{
while (len--)
UEDATX = *data++;
}
static void
usb_write_packet_progmem(const uint8_t *data, uint8_t len)
{
while (len--)
UEDATX = READP(*data++);
}
static void
usb_read_packet(uint8_t *data, uint8_t len)
{
while (len--)
*data++ = UEDATX;
}
int_fast8_t
usb_read_bulk_out(void *data, uint_fast8_t max_len)
{
UENUM = USB_CDC_EP_BULK_OUT;
if (!(UEINTX & (1<<RXOUTI))) {
// No data ready
UEIENX = 1<<RXOUTE;
return -1;
}
uint8_t len = UEBCLX;
usb_read_packet(data, len);
UEINTX = (uint8_t)~((1<<FIFOCON) | (1<<RXOUTI));
return len;
}
int_fast8_t
usb_send_bulk_in(void *data, uint_fast8_t len)
{
UENUM = USB_CDC_EP_BULK_IN;
if (!(UEINTX & (1<<TXINI))) {
// Buffer full
UEIENX = 1<<TXINE;
return -1;
}
usb_write_packet(data, len);
UEINTX = (uint8_t)~((1<<FIFOCON) | (1<<TXINI) | (1<<RXOUTI));
return len;
}
int_fast8_t
usb_read_ep0(void *data, uint_fast8_t max_len)
{
UENUM = 0;
uint8_t ueintx = UEINTX;
if (ueintx & (1<<RXSTPI))
return -2;
if (!(ueintx & (1<<RXOUTI))) {
// Not ready to receive data
UEIENX = (1<<RXSTPE) | (1<<RXOUTE);
return -1;
}
usb_read_packet(data, max_len);
if (UEINTX & (1<<RXSTPI))
return -2;
UEINTX = ~(1<<RXOUTI);
return max_len;
}
int_fast8_t
usb_read_ep0_setup(void *data, uint_fast8_t max_len)
{
UENUM = 0;
uint8_t ueintx = UEINTX;
if (!(ueintx & ((1<<RXSTPI)))) {
// No data ready to read
UEIENX = 1<<RXSTPE;
return -1;
}
usb_read_packet(data, max_len);
UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI));
return max_len;
}
static int8_t
_usb_send_ep0(const void *data, uint8_t len, uint8_t progmem)
{
UENUM = 0;
uint8_t ueintx = UEINTX;
if (ueintx & ((1<<RXSTPI) | (1<<RXOUTI)))
return -2;
if (!(ueintx & (1<<TXINI))) {
// Not ready to send
UEIENX = (1<<RXSTPE) | (1<<RXOUTE) | (1<<TXINE);
return -1;
}
if (progmem)
usb_write_packet_progmem(data, len);
else
usb_write_packet(data, len);
UEINTX = ~(1<<TXINI);
return len;
}
int_fast8_t
usb_send_ep0(const void *data, uint_fast8_t len)
{
return _usb_send_ep0(data, len, 0);
}
int_fast8_t
usb_send_ep0_progmem(const void *data, uint_fast8_t len)
{
return _usb_send_ep0(data, len, 1);
}
void
usb_stall_ep0(void)
{
UENUM = 0;
UECONX = (1<<STALLRQ) | (1<<EPEN);
UEIENX = 1<<RXSTPE;
}
static uint8_t set_address;
void
usb_set_address(uint_fast8_t addr)
{
set_address = addr | (1<<ADDEN);
_usb_send_ep0(NULL, 0, 0);
UEIENX = (1<<RXSTPE) | (1<<TXINE);
}
void
usb_set_configure(void)
{
UENUM = USB_CDC_EP_ACM;
UECONX = 1<<EPEN;
UECFG0X = EP_TYPE_INTERRUPT_IN;
UECFG1X = EP_SIZE(USB_CDC_EP_ACM_SIZE) | EP_SINGLE_BUFFER;
UENUM = USB_CDC_EP_BULK_OUT;
UECONX = 1<<EPEN;
UECFG0X = EP_TYPE_BULK_OUT;
UECFG1X = EP_SIZE(USB_CDC_EP_BULK_OUT_SIZE) | EP_DOUBLE_BUFFER;
UEIENX = 1<<RXOUTE;
UENUM = USB_CDC_EP_BULK_IN;
UECONX = 1<<EPEN;
UECFG0X = EP_TYPE_BULK_IN;
UECFG1X = EP_SIZE(USB_CDC_EP_BULK_IN_SIZE) | EP_DOUBLE_BUFFER;
UEIENX = 1<<TXINE;
}
void
usb_request_bootloader(void)
{
}
#if CONFIG_MACH_at90usb1286
#define UHWCON_Init ((1<<UIMOD) | (1<<UVREGE))
#define PLLCSR_Init ((1<<PLLP2) | (1<<PLLP0) | (1<<PLLE))
#elif CONFIG_MACH_at90usb646
#define UHWCON_Init ((1<<UIMOD) | (1<<UVREGE))
#define PLLCSR_Init ((1<<PLLP2) | (1<<PLLP1) | (1<<PLLE))
#elif CONFIG_MACH_atmega32u4
#define UHWCON_Init (1<<UVREGE)
#define PLLCSR_Init ((1<<PINDIV) | (1<<PLLE))
#endif
void
usbserial_init(void)
{
// Set USB controller to device mode
UHWCON = UHWCON_Init;
// Enable USB clock
USBCON = (1<<USBE) | (1<<FRZCLK);
PLLCSR = PLLCSR_Init;
while (!(PLLCSR & (1<<PLOCK)))
;
USBCON = (1<<USBE) | (1<<OTGPADE);
// Enable USB pullup
UDCON = 0;
// Enable interrupts
UDIEN = 1<<EORSTE;
}
DECL_INIT(usbserial_init);
ISR(USB_GEN_vect)
{
uint8_t udint = UDINT;
UDINT = 0;
if (udint & (1<<EORSTI)) {
// Configure endpoint 0 after usb reset completes
uint8_t old_uenum = UENUM;
UENUM = 0;
UECONX = 1<<EPEN;
UECFG0X = EP_TYPE_CONTROL;
UECFG1X = EP_SIZE(USB_CDC_EP0_SIZE) | EP_SINGLE_BUFFER;
UEIENX = 1<<RXSTPE;
UENUM = old_uenum;
}
}
ISR(USB_COM_vect)
{
uint8_t ueint = UEINT, old_uenum = UENUM;
if (ueint & (1<<0)) {
UENUM = 0;
UEIENX = 0;
usb_notify_ep0();
uint8_t ueintx = UEINTX;
if (!(ueintx & (1<<RXSTPI)) && (ueintx & (1<<TXINI)) && set_address) {
// Ack from set_address command sent - now update address
UDADDR = set_address;
set_address = 0;
}
}
if (ueint & (1<<USB_CDC_EP_BULK_OUT)) {
UENUM = USB_CDC_EP_BULK_OUT;
UEIENX = 0;
usb_notify_bulk_out();
}
if (ueint & (1<<USB_CDC_EP_BULK_IN)) {
UENUM = USB_CDC_EP_BULK_IN;
UEIENX = 0;
usb_notify_bulk_in();
}
UENUM = old_uenum;
}
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