diff options
Diffstat (limited to 'firmware')
| -rw-r--r-- | firmware/main.c | 150 |
1 files changed, 75 insertions, 75 deletions
diff --git a/firmware/main.c b/firmware/main.c index 6bcc642..9f0ebe5 100644 --- a/firmware/main.c +++ b/firmware/main.c @@ -130,7 +130,7 @@ static inline void eraseApplication(void) { // simply write currently stored page in to already erased flash memory static inline void writeFlashPage(void) { - if (currentAddress.w<=BOOTLOADER_ADDRESS) + if (currentAddress.w - 2 <BOOTLOADER_ADDRESS) boot_page_write(currentAddress.w - 2); // will halt CPU, no waiting required } @@ -164,7 +164,7 @@ static uint8_t usbFunctionSetup(uint8_t data[8]) { if (rq->bRequest == cmd_device_info) { // get device info usbMsgPtr = (usbMsgPtr_t)configurationReply; - return 4; + return sizeof(configurationReply); } else if (rq->bRequest == cmd_transfer_page) { // initialize write page currentAddress.w = rq->wIndex.word; } else if (rq->bRequest == cmd_write_data) { // Write data @@ -250,80 +250,80 @@ int main(void) { } do { - - USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; - - while ( !(USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) ); - USB_INTR_VECTOR(); - - - command=cmd_local_nop; - PORTB|=_BV(PB1); - USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; - usbPoll(); - - // Test whether another interrupt occured during the processing of USBpoll. - // If yes, we missed a data packet on the bus. This is not a big issue, since - // USB seems to allow timeout of up the two packets. (On my machine an USB - // error is triggered after the third missed packet.) - // The most critical situation occurs when a PID IN packet is missed due to - // it's short length. Each packet + timeout takes around 45µs, meaning that - // usbpoll must take less than 90µs or resyncing is not possible. - // To avoid synchronizing of the interrupt routine, we must not call it while - // a packet is transmitted. Therefore we have to wait until the bus is idle again. - // - // Just waiting for EOP (SE0) or no activity for 6 bus cycles is not enough, - // as the host may have been sending a multi-packet transmission (eg. OUT or SETUP) - // In that case we may resynch within a transmission, causing errors. - // - // A safer way is to wait until the bus was idle for the time it takes to send - // an ACK packet by the client (10.5µs on D+) but not as long as bus - // time out (12µs) - // - // TODO: Fix usb receiver to ignore DATA1/0 packets without preceding OUT or SETUP + + USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; + + while ( !(USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) ); + USB_INTR_VECTOR(); + + + command=cmd_local_nop; + PORTB|=_BV(PB1); + USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; + usbPoll(); + + // Test whether another interrupt occured during the processing of USBpoll. + // If yes, we missed a data packet on the bus. This is not a big issue, since + // USB seems to allow timeout of up the two packets. (On my machine an USB + // error is triggered after the third missed packet.) + // The most critical situation occurs when a PID IN packet is missed due to + // it's short length. Each packet + timeout takes around 45µs, meaning that + // usbpoll must take less than 90µs or resyncing is not possible. + // To avoid synchronizing of the interrupt routine, we must not call it while + // a packet is transmitted. Therefore we have to wait until the bus is idle again. + // + // Just waiting for EOP (SE0) or no activity for 6 bus cycles is not enough, + // as the host may have been sending a multi-packet transmission (eg. OUT or SETUP) + // In that case we may resynch within a transmission, causing errors. + // + // A safer way is to wait until the bus was idle for the time it takes to send + // an ACK packet by the client (10.5µs on D+) but not as long as bus + // time out (12µs) + // + // TODO: Fix usb receiver to ignore DATA1/0 packets without preceding OUT or SETUP + + if (USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) // Usbpoll() intersected with data packet + { + PORTB|=_BV(PB0); + uint8_t ctr; + + // loop takes 5 cycles + asm volatile( + " ldi %0,%1 \n\t" + "loop%=: sbic %2,%3 \n\t" + " ldi %0,%1 \n\t" + " subi %0,1 \n\t" + " brne loop%= \n\t" + : "=&d" (ctr) + : "M" ((uint8_t)(10.0f*(F_CPU/1.0e6f)/5.0f+0.5)), "I" (_SFR_IO_ADDR(USBIN)), "M" (USB_CFG_DPLUS_BIT) + ); + + PORTB&=~_BV(PB0); + } + PORTB&=~_BV(PB1); + + if (command == cmd_local_nop) continue; + /* if (!ackSent) {ackSent=1;continue;} + ackSent=0;*/ + + USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; + while ( !(USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) ); + USB_INTR_VECTOR(); + + idlePolls.w++; - if (USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) // Usbpoll() intersected with data packet - { - PORTB|=_BV(PB0); - uint8_t ctr; - - // loop takes 5 cycles - asm volatile( - " ldi %0,%1 \n\t" - "loop%=: sbic %2,%3 \n\t" - " ldi %0,%1 \n\t" - " subi %0,1 \n\t" - " brne loop%= \n\t" - : "=&d" (ctr) - : "M" ((uint8_t)(10.0f*(F_CPU/1.0e6f)/5.0f+0.5)), "I" (_SFR_IO_ADDR(USBIN)), "M" (USB_CFG_DPLUS_BIT) - ); - - PORTB&=~_BV(PB0); - } - PORTB&=~_BV(PB1); - - if (command == cmd_local_nop) continue; - /* if (!ackSent) {ackSent=1;continue;} - ackSent=0;*/ - - USB_INTR_PENDING = 1<<USB_INTR_PENDING_BIT; - while ( !(USB_INTR_PENDING & (1<<USB_INTR_PENDING_BIT)) ); - USB_INTR_VECTOR(); - - idlePolls.w++; - - // Try to execute program if bootloader exit condition is met - // if (AUTO_EXIT_MS&&(idlePolls.w==AUTO_EXIT_MS*10L)) command=cmd_exit; - - LED_MACRO( idlePolls.b[1] ); - - if (command==cmd_erase_application) - eraseApplication(); - // Attention: eraseApplication will set command=cmd_write_page! - if (command==cmd_write_page) - writeFlashPage(); - - /* main event loop runs as long as no program is uploaded or existing program is not executed */ + // Try to execute program if bootloader exit condition is met + // if (AUTO_EXIT_MS&&(idlePolls.w==AUTO_EXIT_MS*10L)) command=cmd_exit; + + LED_MACRO( idlePolls.b[1] ); + + if (command==cmd_erase_application) + eraseApplication(); + // Attention: eraseApplication will set command=cmd_write_page! + if (command==cmd_write_page) + writeFlashPage(); + + /* main event loop runs as long as no program is uploaded or existing program is not executed */ } while((command!=cmd_exit)||(pgm_read_byte(BOOTLOADER_ADDRESS - TINYVECTOR_RESET_OFFSET + 1)==0xff)); LED_EXIT(); |