| Overview |
| ======== |
| CMSIS-Driver defines generic peripheral driver interfaces for middleware making it reusable across a wide |
| range of supported microcontroller devices. The API connects microcontroller peripherals with middleware |
| that implements for example communication stacks, file systems, or graphic user interfaces. |
| More information and usage method please refer to http://www.keil.com/pack/doc/cmsis/Driver/html/index.html. |
| |
| The cmsis_ecspi_int_loopback_transfer example shows how to use CMSIS ECSPI driver in interrupt way: |
| |
| In this example , ECSPI will do a loopback transfer in interrupt way, so, there is no need to set up any pins. |
| And we should set the ECSPIx->TESTREG[LBC] bit, this bit is used in Master mode only. When this bit is set, |
| the ECSPI connects the transmitter and receiver sections internally, and the data shifted out from the |
| most-significant bit of the shift register is looped back into the least-significant bit of the Shift register. |
| In this way, a self-test of the complete transmit/receive path can be made. The output pins are not affected, |
| and the input pins are ignored. |
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| Toolchain supported |
| =================== |
| - IAR embedded Workbench 8.50.1 |
| - GCC ARM Embedded 9.2.1 |
| |
| Hardware requirements |
| ===================== |
| - Micro USB cable |
| - MIMX8MQ6-EVK board |
| - J-Link Debug Probe |
| - 12V power supply |
| - Personal Computer |
| |
| Board settings |
| ============== |
| No special settings are required. |
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| |
| Prepare the Demo |
| ================ |
| 1. Connect 12V power supply and J-Link Debug Probe to the board, switch SW701 to power on the board |
| 2. Connect a USB cable between the host PC and the J1701 USB port on the target board. |
| 3. Open a serial terminal with the following settings: |
| - 115200 baud rate |
| - 8 data bits |
| - No parity |
| - One stop bit |
| - No flow control |
| 4. Download the program to the target board. |
| 5. Either press the reset button on your board or launch the debugger in your IDE to begin running the demo. |
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| |
| Running the demo |
| ================ |
| When the demo runs successfully, the log would be seen on the debug terminal like: |
| |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| This is ECSPI CMSIS interrupt loopback transfer example. |
| The ECSPI will connect the transmitter and receiver sections internally. |
| Start transfer... |
| |
| This is ECSPI_MasterSignalEvent_t. |
| |
| Transfer completed! |
| ECSPI transfer all data matched! |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| Customization options |
| ===================== |
| |