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[Core] Unite half-duplex and full-duplex serial drivers (#13081)

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* Unite half-duplex and full-duplex serial driver.

* Add full duplex operation mode to the interrupt based driver
* Delete DMA UART based full duplex driver
* The new driver targets #11930

* Fix freezes with failing transactions in half-duplex

* Increase default serial TX/RX buffer size to 128 bytes

* Correctly use bool instead of size_t

Co-authored-by: Nick Brassel <nick@tzarc.org>
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Stefan Kerkmann 2021-07-02 00:24:08 +02:00 • committed by GitHub
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15
docs/serial_driver.md
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@ -73,7 +73,7 @@ You must also enable the ChibiOS `SERIAL` feature:
Do note that the configuration required is for the `SERIAL` peripheral, not the `UART` peripheral.
### USART Full-duplex
Targeting STM32 boards where communication is offloaded to a USART hardware device. The advantage over bitbang is that this provides fast and accurate timings. USART Full-Duplex requires two conductors **without** pull-up resistors instead of one conductor with a pull-up resistor unlike the Half-duplex driver, but it is more efficent as it uses DMA transfers, which can result in even faster transmission speeds.
Targeting STM32 boards where communication is offloaded to a USART hardware device. The advantage over bitbang is that this provides fast and accurate timings. USART Full-Duplex requires two conductors **without** pull-up resistors instead of one conductor with a pull-up resistor unlike the Half-duplex driver. Due to its internal design it is more efficent, which can result in even faster transmission speeds.
#### Pin configuration
@ -86,12 +86,13 @@ Please note that `TX` of the master half has to be connected with the `RX` pin o
To use the driver, add this to your rules.mk:
```make
SERIAL_DRIVER = usart_duplex
SERIAL_DRIVER = usart
```
Next configure the hardware via your config.h:
```c
#define SERIAL_USART_FULL_DUPLEX // Enable full duplex operation mode.
#define SERIAL_USART_TX_PIN B6 // USART TX pin
#define SERIAL_USART_RX_PIN B7 // USART RX pin
//#define USART1_REMAP // Remap USART TX and RX pins on STM32F103 MCUs, see table below.
@ -104,17 +105,17 @@ Next configure the hardware via your config.h:
// 3: 57600 baud
// 4: 38400 baud
// 5: 19200 baud
#define SERIAL_USART_DRIVER UARTD1 // USART driver of TX and RX pin. default: UARTD1
#define SERIAL_USART_DRIVER SD1 // USART driver of TX and RX pin. default: SD1
#define SERIAL_USART_TX_PAL_MODE 7 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 7
#define SERIAL_USART_RX_PAL_MODE 7 // Pin "alternate function", see the respective datasheet for the appropriate values for your MCU. default: 7
#define SERIAL_USART_TIMEOUT 100 // USART driver timeout. default 100
```
You must also enable the ChibiOS `UART` with blocking api feature:
* In your board's halconf.h: `#define HAL_USE_UART TRUE` and `#define UART_USE_WAIT TRUE`
* In your board's mcuconf.h: `#define STM32_UART_USE_USARTn TRUE` (where 'n' matches the peripheral number of your selected USART on the MCU)
You must also enable the ChibiOS `SERIAL` feature:
* In your board's halconf.h: `#define HAL_USE_SERIAL TRUE`
* In your board's mcuconf.h: `#define STM32_SERIAL_USE_USARTn TRUE` (where 'n' matches the peripheral number of your selected USART on the MCU)
Do note that the configuration required is for the `UART` peripheral, not the `SERIAL` peripheral.
Do note that the configuration required is for the `SERIAL` peripheral, not the `UART` peripheral.
#### Pins for USART Peripherals with Alternate Functions for selected STM32 MCUs