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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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5
src/mw.h
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@ -276,8 +276,9 @@ typedef struct master_t {
uint32_t serial_baudrate;
uint32_t softserial_baudrate;
uint8_t softserial_inverted; // use inverted softserial input and output signals
uint32_t softserial_baudrate; // shared by both soft serial ports
uint8_t softserial_1_inverted; // use inverted softserial input and output signals on port 1
uint8_t softserial_2_inverted; // use inverted softserial input and output signals on port 2
uint8_t telemetry_softserial; // Serial to use for Telemetry. 0:USART1, 1:SoftSerial1 (Enable FEATURE_SOFTSERIAL first)
uint8_t telemetry_switch; // Use aux channel to change serial output & baudrate( MSP / Telemetry ). It disables automatic switching to Telemetry when armed.