Hi i have a teensy 2.0 with ATMEGA32U4 i have been trying to convert the teensy arduino midi library so it can be used directly like Usb serial / keyboard examples in the "Code Library" selection on the teensy website.
The main reason for doing this without the arduino is so i can swap USB device profile on startup acording to some dip switches ie be able to choose usb midi , keyboard , serial port .
The problem im having is i can Initialize the USB midi but i can't seem to write anything out.
My code compiles fine in AVR studio with no errors and my computer sees a usb midi device but cant seem to get anything to write out.
Below is how im trying to test it
Bellow are the functions i thought are relevant missing out include files and definitions ect
I basically just took sendControlChange() and send_raw() out of the arduino usb_api.cpp
Any help or advice would be great as not sure where im going wrong.
Cheers for looking
Luke
The main reason for doing this without the arduino is so i can swap USB device profile on startup acording to some dip switches ie be able to choose usb midi , keyboard , serial port .
The problem im having is i can Initialize the USB midi but i can't seem to write anything out.
My code compiles fine in AVR studio with no errors and my computer sees a usb midi device but cant seem to get anything to write out.
Below is how im trying to test it
Code:
int main(void)
{
usb_init(); // this must be ok as computer sees "USB midi"
_delay_ms(1000);
while(1)
{
sendControlChange(16,255,1);
}Bellow are the functions i thought are relevant missing out include files and definitions ect
I basically just took sendControlChange() and send_raw() out of the arduino usb_api.cpp
Code:
// initialize USB serial
void usb_init(void)
{
uint8_t u;
u = USBCON;
if ((u & (1<<USBE)) && !(u & (1<<FRZCLK))) return;
HW_CONFIG();
USB_FREEZE(); // enable USB
PLL_CONFIG(); // config PLL
while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
USB_CONFIG(); // start USB clock
UDCON = 0; // enable attach resistor
usb_configuration = 0;
usb_suspended = 0;
debug_flush_timer = 0;
UDINT = 0;
UDIEN = (1<<EORSTE)|(1<<SOFE);
sei(); // init() in wiring.c does this
}
void sendControlChange(uint8_t control, uint8_t value, uint8_t channel)
{
send_raw(0x0B, 0xB0 | ((channel - 1) & 0x0F), control & 0x7F, value & 0x7F);
}
void send_raw(uint8_t b0, uint8_t b1, uint8_t b2, uint8_t b3)
{
uint8_t intr_state, timeout;
if (!usb_configuration) return;
intr_state = SREG;
cli();
UENUM = MIDI_TX_ENDPOINT;
timeout = UDFNUML + 2;
while (1) {
// are we ready to transmit?
if (UEINTX & (1<<RWAL)) break;
SREG = intr_state;
if (UDFNUML == timeout) return;
if (!usb_configuration) return;
intr_state = SREG;
cli();
UENUM = MIDI_TX_ENDPOINT;
}
UEDATX = b0;
UEDATX = b1;
UEDATX = b2;
UEDATX = b3;
if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
SREG = intr_state;
}
ISR(USB_GEN_vect)
{
uint8_t intbits, t, i;
static uint8_t div4=0;
intbits = UDINT;
UDINT = 0;
if (intbits & (1<<EORSTI)) {
UENUM = 0;
UECONX = 1;
UECFG0X = EP_TYPE_CONTROL;
UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
UEIENX = (1<<RXSTPE);
usb_configuration = 0;
}
if ((intbits & (1<<SOFI)) && usb_configuration) {
t = debug_flush_timer;
if (t) {
debug_flush_timer = --t;
if (!t) {
UENUM = DEBUG_TX_ENDPOINT;
while ((UEINTX & (1<<RWAL))) {
UEDATX = 0;
}
UEINTX = 0x3A;
}
}
UENUM = MIDI_TX_ENDPOINT;
if (UEBCLX) UEINTX = 0x3A;
}
if (intbits & (1<<SUSPI)) {
// USB Suspend (inactivity for 3ms)
UDIEN = (1<<WAKEUPE);
usb_configuration = 0;
usb_suspended = 1;
#if (F_CPU >= 8000000L)
// WAKEUPI does not work with USB clock freeze
// when CPU is running less than 8 MHz.
// Is this a hardware bug?
USB_FREEZE(); // shut off USB
PLLCSR = 0; // shut off PLL
#endif
// to properly meet the USB spec, current must
// reduce to less than 2.5 mA, which means using
// powerdown mode, but that breaks the Arduino
// user's paradigm....
}
if (usb_suspended && (intbits & (1<<WAKEUPI))) {
// USB Resume (pretty much any activity)
#if (F_CPU >= 8000000L)
PLL_CONFIG();
while (!(PLLCSR & (1<<PLOCK))) ;
USB_CONFIG();
#endif
UDIEN = (1<<EORSTE)|(1<<SOFE)|(1<<SUSPE);
usb_suspended = 0;
return;
}
}
// Misc functions to wait for ready and send/receive packets
static inline void usb_wait_in_ready(void)
{
while (!(UEINTX & (1<<TXINI))) ;
}
static inline void usb_send_in(void)
{
UEINTX = ~(1<<TXINI);
}
static inline void usb_wait_receive_out(void)
{
while (!(UEINTX & (1<<RXOUTI))) ;
}
static inline void usb_ack_out(void)
{
UEINTX = ~(1<<RXOUTI);
}
// USB Endpoint Interrupt - endpoint 0 is handled here. The
// other endpoints are manipulated by the user-callable
// functions, and the start-of-frame interrupt.
//
ISR(USB_COM_vect)
{
uint8_t intbits;
const uint8_t *list;
const uint8_t *cfg;
uint8_t i, n, len, en;
uint8_t *p;
uint8_t bmRequestType;
uint8_t bRequest;
uint16_t wValue;
uint16_t wIndex;
uint16_t wLength;
uint16_t desc_val;
const uint8_t *desc_addr;
uint8_t desc_length;
UENUM = 0;
intbits = UEINTX;
if (intbits & (1<<RXSTPI)) {
bmRequestType = UEDATX;
bRequest = UEDATX;
read_word_lsbfirst(wValue, UEDATX);
read_word_lsbfirst(wIndex, UEDATX);
read_word_lsbfirst(wLength, UEDATX);
UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
if (bRequest == GET_DESCRIPTOR) {
list = (const uint8_t *)descriptor_list;
for (i=0; ; i++) {
if (i >= NUM_DESC_LIST) {
UECONX = (1<<STALLRQ)|(1<<EPEN); //stall
return;
}
pgm_read_word_postinc(desc_val, list);
if (desc_val != wValue) {
list += sizeof(struct descriptor_list_struct)-2;
continue;
}
pgm_read_word_postinc(desc_val, list);
if (desc_val != wIndex) {
list += sizeof(struct descriptor_list_struct)-4;
continue;
}
pgm_read_word_postinc(desc_addr, list);
desc_length = pgm_read_byte(list);
break;
}
len = (wLength < 256) ? wLength : 255;
if (len > desc_length) len = desc_length;
list = desc_addr;
do {
// wait for host ready for IN packet
do {
i = UEINTX;
} while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
if (i & (1<<RXOUTI)) return; // abort
// send IN packet
n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
for (i = n; i; i--) {
pgm_read_byte_postinc(UEDATX, list);
}
len -= n;
usb_send_in();
} while (len || n == ENDPOINT0_SIZE);
return;
}
if (bRequest == SET_ADDRESS) {
usb_send_in();
usb_wait_in_ready();
UDADDR = wValue | (1<<ADDEN);
return;
}
if (bRequest == SET_CONFIGURATION && bmRequestType == 0) {
usb_configuration = wValue;
debug_flush_timer = 0;
usb_send_in();
cfg = endpoint_config_table;
for (i=1; i<NUM_ENDPOINTS; i++) {
UENUM = i;
pgm_read_byte_postinc(en, cfg);
UECONX = en;
if (en) {
pgm_read_byte_postinc(UECFG0X, cfg);
pgm_read_byte_postinc(UECFG1X, cfg);
}
}
UERST = 0x1E;
UERST = 0;
return;
}
if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
usb_wait_in_ready();
UEDATX = usb_configuration;
usb_send_in();
return;
}
if (bRequest == GET_STATUS) {
usb_wait_in_ready();
i = 0;
if (bmRequestType == 0x82) {
UENUM = wIndex;
if (UECONX & (1<<STALLRQ)) i = 1;
UENUM = 0;
}
UEDATX = i;
UEDATX = 0;
usb_send_in();
return;
}
if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
&& bmRequestType == 0x02 && wValue == 0) {
i = wIndex & 0x7F;
if (i >= 1 && i <= MAX_ENDPOINT) {
usb_send_in();
UENUM = i;
if (bRequest == SET_FEATURE) {
UECONX = (1<<STALLRQ)|(1<<EPEN);
} else {
UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
UERST = (1 << i);
UERST = 0;
}
return;
}
}
if (wIndex == DEBUG_INTERFACE) {
if (bRequest == HID_GET_REPORT && bmRequestType == 0xA1) {
len = wLength;
do {
// wait for host ready for IN packet
do {
i = UEINTX;
} while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
if (i & (1<<RXOUTI)) return; // abort
// send IN packet
n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
for (i = n; i; i--) {
UEDATX = 0;
}
len -= n;
usb_send_in();
} while (len || n == ENDPOINT0_SIZE);
return;
}
if (bRequest == HID_SET_REPORT && bmRequestType == 0x21) {
if (wValue == 0x0300 && wLength == 0x0004) {
uint8_t b1, b2, b3, b4;
usb_wait_receive_out();
b1 = UEDATX;
b2 = UEDATX;
b3 = UEDATX;
b4 = UEDATX;
usb_ack_out();
usb_send_in();
//if (b1 == 0xA9 && b2 == 0x45 && b3 == 0xC2 && b4 == 0x6B)
//_reboot_Teensyduino_();
//if (b1 == 0x8B && b2 == 0xC5 && b3 == 0x1D && b4 == 0x70)
//_restart_Teensyduino_();
}
}
}
}
UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
}Any help or advice would be great as not sure where im going wrong.
Cheers for looking
Luke
Last edited:
although comes up named as "usb device" not the name set in the usb descriptors .