diff options
Diffstat (limited to 'tmk_core/protocol/pjrc/usb_debug.c')
| -rw-r--r-- | tmk_core/protocol/pjrc/usb_debug.c | 128 |
1 files changed, 62 insertions, 66 deletions
diff --git a/tmk_core/protocol/pjrc/usb_debug.c b/tmk_core/protocol/pjrc/usb_debug.c index c1e6f6544..7e78d96c3 100644 --- a/tmk_core/protocol/pjrc/usb_debug.c +++ b/tmk_core/protocol/pjrc/usb_debug.c @@ -25,78 +25,74 @@ #include "sendchar.h" #include "usb_debug.h" - // the time remaining before we transmit any partially full // packet, or send a zero length packet. -volatile uint8_t debug_flush_timer=0; - +volatile uint8_t debug_flush_timer = 0; -int8_t sendchar(uint8_t c) -{ - static uint8_t previous_timeout=0; - uint8_t timeout, intr_state; +int8_t sendchar(uint8_t c) { + static uint8_t previous_timeout = 0; + uint8_t timeout, intr_state; - // if we're not online (enumerated and configured), error - if (!usb_configured()) return -1; - // interrupts are disabled so these functions can be - // used from the main program or interrupt context, - // even both in the same program! - intr_state = SREG; - cli(); - UENUM = DEBUG_TX_ENDPOINT; - // if we gave up due to timeout before, don't wait again - if (previous_timeout) { - if (!(UEINTX & (1<<RWAL))) { - SREG = intr_state; - return -1; - } - previous_timeout = 0; - } - // wait for the FIFO to be ready to accept data - timeout = UDFNUML + 4; - while (1) { - // are we ready to transmit? - if (UEINTX & (1<<RWAL)) break; - SREG = intr_state; - // have we waited too long? - if (UDFNUML == timeout) { - previous_timeout = 1; - return -1; - } - // has the USB gone offline? - if (!usb_configured()) return -1; - // get ready to try checking again - intr_state = SREG; - cli(); - UENUM = DEBUG_TX_ENDPOINT; - } - // actually write the byte into the FIFO - UEDATX = c; - // if this completed a packet, transmit it now! - if (!(UEINTX & (1<<RWAL))) { - UEINTX = 0x3A; - debug_flush_timer = 0; - } else { - debug_flush_timer = 2; - } - SREG = intr_state; - return 0; + // if we're not online (enumerated and configured), error + if (!usb_configured()) return -1; + // interrupts are disabled so these functions can be + // used from the main program or interrupt context, + // even both in the same program! + intr_state = SREG; + cli(); + UENUM = DEBUG_TX_ENDPOINT; + // if we gave up due to timeout before, don't wait again + if (previous_timeout) { + if (!(UEINTX & (1 << RWAL))) { + SREG = intr_state; + return -1; + } + previous_timeout = 0; + } + // wait for the FIFO to be ready to accept data + timeout = UDFNUML + 4; + while (1) { + // are we ready to transmit? + if (UEINTX & (1 << RWAL)) break; + SREG = intr_state; + // have we waited too long? + if (UDFNUML == timeout) { + previous_timeout = 1; + return -1; + } + // has the USB gone offline? + if (!usb_configured()) return -1; + // get ready to try checking again + intr_state = SREG; + cli(); + UENUM = DEBUG_TX_ENDPOINT; + } + // actually write the byte into the FIFO + UEDATX = c; + // if this completed a packet, transmit it now! + if (!(UEINTX & (1 << RWAL))) { + UEINTX = 0x3A; + debug_flush_timer = 0; + } else { + debug_flush_timer = 2; + } + SREG = intr_state; + return 0; } // immediately transmit any buffered output. -void usb_debug_flush_output(void) -{ - uint8_t intr_state; +void usb_debug_flush_output(void) { + uint8_t intr_state; - intr_state = SREG; - cli(); - if (debug_flush_timer) { - UENUM = DEBUG_TX_ENDPOINT; - while ((UEINTX & (1<<RWAL))) { - UEDATX = 0; - } - UEINTX = 0x3A; - debug_flush_timer = 0; - } - SREG = intr_state; + intr_state = SREG; + cli(); + if (debug_flush_timer) { + UENUM = DEBUG_TX_ENDPOINT; + while ((UEINTX & (1 << RWAL))) { + UEDATX = 0; + } + UEINTX = 0x3A; + debug_flush_timer = 0; + } + SREG = intr_state; } |