I took a cut at modifying the firmware, building, and flashing to the core. I haven’t had a chance to test whether the USART is working yet, but will plan to give it a go as soon as I can get my hands the device I’m working with (sometime later this week). I forked the spark/firmware repo, and you can take a look at the commit with changes here:. Happy to field your thoughts on any changes (coding style, bugs, etc)? The current commit exposes most of the STM32’s USART functionality (e.g.

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Serial object works much the same way as on a regular Arduino. Apart from hardware FIFO (128 bytes for TX and RX) HardwareSerial has additional 256-byte TX and RX buffers. Both transmit and receive is interrupt-driven.

Everything except disabling RX/TX), and the USART configuration can be specified from a predefined configuration (e.g. Serial1.begin(9600, SERIAL_8N2);) or by combining different configuration flags (e.g. Serial1.begin(9600, FLOW_NONE WL_8 PAR_NONE SB_1);). It might make sense to provide the most common configurations and allow users to access the configuration flags for less common configurations (e.g. Thanks again for the guidance. Just some quick feedback.

Hardware flow control on the STM32 requires specific GPIO pins. Those pins are not currently mapped onto physical pins of the Core, explaining why HW flow control is not implemented. Also, if you are defining 9-bit operation, then the ISR, all buffers and supporting code will need to change since they are currently setup for 8-bit operation. In my own experience I have only seen 7-bit and 8-bit configurations with variations on parity (none, odd, even) and stop bits (1 or 2). The STM32 does not support 7-bit operation so that leaves 8-bit as most common. My recommendation is to support variations of the 8-bit protocol only, keeping the base code compatible with Arduino.

Thanks for the feedback. I realized I wasn’t working on the HAL branch, so I switched over an implemented the code on that branch. Hopefully I put things in the right places Here’s the diff from the spark/feature/hal branch and summary of changes: wiring/src/spark_wiring_usartserial.h • Included define statements here for all of the serial configurations supported by arduino (5-8 data bits, none/even/odd parity, and 1/2 stop bits). • Even though the STM32 only supports the 8 data bit configurations, I included them all in case some future chip supports other serial modes. Wiring/src/spark_wiring_usartserial.cpp • Basic refactor to call HAL_USART_Begin from the USARTSerial::begin(baud, config) instead of begin(baud). Defaults the simpler implementation to SERIAL_8N1 hal/inc/usart_hal.h • Updated the HAL_USART_Begin(HAL_USART_Serial serial, uint32_t baud, uint8_t config); to require a configuration byte.

Hal/src/core-v1/usart_hal.c • Added a macro to see whether the specified configuration is valid for the STM32 architecture • If the configuration is invalid, sets the usart_enabled flag to false • Should we include checks on this flag in all of the other HAL_USART functions (e.g. • Configured USART_InitStructure based on passed in config value Built and tested on Serial1 with SERIAL_8N1 configuration sending data to an Arduino Nano (no TX test because I didn’t feel like setting up logic level shifters to convert from 5V to 3V3). On second thought, it might make more sense to put the SERIAL_XXX definitions in a conditional macro so that the compiler throws an error if someone tries to use an invalid configuration (e.g.