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57 lines
2.1 KiB
Markdown
57 lines
2.1 KiB
Markdown
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| Supported Targets | ESP32 | ESP32-S3 |
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| ----------------- | ----- | -------- |
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# Hi-priority IPC example
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This example demonstrates how to use Hi-priority IPC, it is based on Hi-priority interrupt (level 4). This feature can be useful in case when need quickly to get the state of the other CPU (consult the [Hi-priority IPC](https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/system/ipc.html#hi-priority-ipc)).
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In the `asm_funcs.S` file are functions that will be run on the other core. The function should be fairly simple that can be written in assembler.
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The first asm function `get_ps_other_cpu()` demonstrates a simple way of usage, it returns the PS register of other core.
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The second asm function `extended_ipc_isr_asm()` demonstrates way when need to do some complex operations on other core, for this, save registers to the buffer (regs[]) making them available for use. Then using passed arguments (in[]) do some work and write the result to out[]. At the end recover saved registers.
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## How to use example
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### Hardware Required
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Example should be able to run on any commonly available ESP32 development board. The chip should have two cores.
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### Configure the project
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- `CONFIG_FREERTOS_UNICORE` - disabled,
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- `CONFIG_ESP_IPC_ISR_ENABLE` - enabled.
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```
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idf.py menuconfig
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```
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### Build and Flash
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```
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idf.py build flash monitor
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```
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(To exit the serial monitor, type ``Ctrl-]``.)
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See the [Getting Started Guide](https://docs.espressif.com/projects/esp-idf/en/latest/get-started/index.html) for full steps to configure and use ESP-IDF to build projects.
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## Example output
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```
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I (304) example: Start
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I (304) example: call get_ps_other_cpu
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I (314) example: PS_INTLEVEL = 0x5
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I (314) example: PS_EXCM = 0x0
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I (324) example: PS_UM = 0x1
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I (324) example: call extended_ipc_isr_asm
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I (324) example: in[0] = 0x1
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I (334) example: in[1] = 0x2
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I (334) example: in[2] = 0x3
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I (334) example: out[0] = (in[0] | in[1] | in[2]) = 0x3
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I (344) example: out[1] = (in[0] & in[1] & in[2]) = 0x6
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I (354) example: out[2] = in[2] = 0x3
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I (354) example: out[3] = PS of other cpu = 0x25
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I (364) example: End
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```
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