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Add flow control by firmware to serial_uart

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This commit is contained in:
tmk 2014-07-20 14:42:44 +09:00
parent 50bcaa66c4
commit 3e7875455e
4 changed files with 30 additions and 9 deletions
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1
keyboard/hhkb_rn42/MEMO.txt
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@ -8,6 +8,7 @@ Roving RN-42
TODO
----
- LUFA sendchar should be buffered and serial_uart.c buffur size is too large(256).
- Factroy reset doesn't work; need to test again. 10K pull-up is too high?
- Lipo voltage ADC sensing
- Lipo charger configuration: fast charge time: USB charger spec?

5
keyboard/hhkb_rn42/config.h
View file

@ -68,9 +68,12 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
UCSR1B |= (1<<RXCIE1) | (1<<RXEN1); /* RX interrupt, RX: enable */ \
UCSR1B |= (0<<TXCIE1) | (1<<TXEN1); /* TX interrupt, TX: enable */ \
UCSR1C |= (0<<UPM11) | (0<<UPM10); /* parity: none(00), even(01), odd(11) */ \
UCSR1D |= (0<<RTSEN) | (0<<CTSEN); /* RTS, CTS */ \
UCSR1D |= (0<<RTSEN) | (0<<CTSEN); /* RTS, CTS(no flow control by hardware) */ \
DDRD |= (1<<5); PORTD &= ~(1<<5); /* RTS for flow control by firmware */ \
sei(); \
} while(0)
#define SERIAL_UART_RTS_LO() do { PORTD &= ~(1<<5); } while (0)
#define SERIAL_UART_RTS_HI() do { PORTD |= (1<<5); } while (0)
#else
#error "USART configuration is needed."
#endif

2
keyboard/hhkb_rn42/rn42/rn42_task.c
View file

@ -56,9 +56,7 @@ void rn42_task(void)
// Config mode: print output from RN-42
while ((c = serial_recv2()) != -1) {
// without flow control it'll fail to receive data when flooded
rn42_cts_hi();
xprintf("%c", c);
rn42_cts_lo();
}
} else {
// Raw mode: interpret output report of LED state

19
protocol/serial_uart.c
View file

@ -41,6 +41,22 @@ POSSIBILITY OF SUCH DAMAGE.
#include "serial.h"
#if defined(SERIAL_UART_RTS_LO) && defined(SERIAL_UART_RTS_HI)
// Buffer state
// Empty: RBUF_SPACE == RBUF_SIZE(head==tail)
// Last 1 space: RBUF_SPACE == 2
// Full: RBUF_SPACE == 1(last cell of rbuf be never used.)
#define RBUF_SPACE() (rbuf_head < rbuf_tail ? (rbuf_tail - rbuf_head) : (RBUF_SIZE - rbuf_head + rbuf_tail))
// allow to send
#define rbuf_check_rts_lo() do { if (RBUF_SPACE() > 2) SERIAL_UART_RTS_LO(); } while (0)
// prohibit to send
#define rbuf_check_rts_hi() do { if (RBUF_SPACE() <= 2) SERIAL_UART_RTS_HI(); } while (0)
#else
#define rbuf_check_rts_lo()
#define rbuf_check_rts_hi()
#endif
void serial_init(void)
{
SERIAL_UART_INIT();
@ -61,6 +77,7 @@ uint8_t serial_recv(void)
data = rbuf[rbuf_tail];
rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
rbuf_check_rts_lo();
return data;
}
@ -73,6 +90,7 @@ int16_t serial_recv2(void)
data = rbuf[rbuf_tail];
rbuf_tail = (rbuf_tail + 1) % RBUF_SIZE;
rbuf_check_rts_lo();
return data;
}
@ -90,4 +108,5 @@ ISR(SERIAL_UART_RXD_VECT)
rbuf[rbuf_head] = SERIAL_UART_DATA;
rbuf_head = next;
}
rbuf_check_rts_hi();
}