The CMSIS-Driver USART requires:
- Setup of USART/UART mode (Asynchronous, Synchronous, Single wire, IrDA or SmartCard)
- Optional configuration of Hardware Flow Control (only in Asynchronous mode).
Valid settings for various evaluation boards are listed in the table below:
Peripheral Resource | STM32L562E-DK |
USART Peripheral | USART1 |
USART Mode | Asynchronous |
TX Pin | PA9 |
RX Pin | PA10 |
For different boards, refer to the hardware schematics to reflect correct setup values.
The STM32CubeMX configuration for STM32L562E-DK with steps for Pinout, Clock, and System Configuration are listed below. Enter the values that are marked bold.
Pinout tab
- Configure USART1 mode
- Peripherals USART1: Mode=Asynchronous, Hardware Flow Control=Disable
Clock Configuration tab
- Configure USART1 Clock.
Configuration tab
- Under Connectivity open USART1 Configuration:
- optional DMA Settings: setup DMA transfers for Rx and Tx (DMA is optional)
Add - Select USART1_RX: Stream=DMA1 Channel 5, DMA Request Settings: not used
Add - Select USART1_TX: Stream=DMA1 Channel 4, DMA Request Settings: not used
- GPIO Settings: review settings, no changes required
Pin Name | Signal on Pin | GPIO mode | GPIO Pull-up/Pull.. | Maximum out | User Label |
PA9 | USART1_TX | Alternate | Pull-up | Very High | . |
PA10 | USART1_RX | Alternate | Pull-up | Very High | . |
- NVIC Settings: enable interrupts
Interrupt Table | Enable | Preemption Priority | Sub Priority |
USART1 global interrupt | ON | 0 | 0 |
DMA1 channel1 global interrupt | ON | 0 | 0 |
DMA1 channel2 global interrupt | ON | 0 | 0 |
- Parameter Settings: not used
- User Constants: not used
- Click OK to close the USART1 Configuration dialog
- Open Project - Settings - Advanced Settings from the menu and enable "Not Generate Function call" for MX_USART1_UART_Init
- Note
- The CMSIS Driver:USART (API):USART component in the Manage Run-Time Environment dialog adds multiple C source files to the project. The interface selection in STM32CubeMX selects the actual implementation that is compiled: IrDA, SmartCard, UART, or USART.