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Add support for 2 softserial ports on PWM4+5/TIM3_CH1+2/PA6+PA7 and

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PWM6+7/TIM3_CH3+4/PB0+PB1

Update software serial to monitor serial pins for signal changes instead
of periodically sampling pin signals.

When reading the data the timer used is syncronized to the falling edge
of the start bit which allows for better syncronisation at higher
speeds.  The code has been tested OK from 1200 baud to 19200.  38400
baud was tested and partially usable but has been disabled because there
are too many transmit and receive errors, especially when transmitting
and receiving at the same time.

Due to the way a single timer is used for transmitting and receiving, if
data comes in while transmitting the system may incorrectly transmit a
short or long bit.  However at 19200 and below this didn't cause a
problem in the limited testing I performed.
This commit is contained in:
Dominic Clifton 2014-04-03 13:24:52 +01:00
parent bd809bca1b
commit c7de7d2ebc
9 changed files with 212 additions and 138 deletions
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15
src/drv_softserial.h
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@ -18,16 +18,16 @@ typedef struct softSerial_s {
const timerHardware_t *txTimerHardware;
volatile uint8_t txBuffer[SOFT_SERIAL_BUFFER_SIZE];
uint8_t isSearchingForStopBit;
uint8_t rxBitSelectionMask;
uint8_t isSearchingForStartBit;
uint8_t rxBitIndex;
uint8_t rxLastRiseAtBitIndex;
uint8_t rxPinMode;
uint8_t isTransmittingData;
uint8_t timerRxCounter;
uint8_t timerTxCounter;
uint8_t bitsLeftToReceive;
uint8_t bitsLeftToTransmit;
uint16_t internalRxBuffer; // excluding start/stop bits
uint16_t internalTxBuffer; // includes start and stop bits
uint16_t internalRxBuffer; // includes start and stop bits
uint8_t isInverted;
} softSerial_t;
@ -37,7 +37,8 @@ extern softSerial_t softSerialPorts[];
extern const struct serialPortVTable softSerialVTable[];
void setupSoftSerial1(uint32_t baud, uint8_t inverted);
void setupSoftSerialPrimary(uint32_t baud, uint8_t inverted);
void setupSoftSerialSecondary(uint8_t inverted);
// serialPort API
void softSerialWriteByte(serialPort_t *instance, uint8_t ch);