Chapter 2. API Reference
CONFIG_TWAI_ISR_IN_IRAM
Place TWAI ISR function into IRAM
Found in: Component config > Driver configurations > TWAI configuration
Place the TWAI ISR in to IRAM. This will allow the ISR to avoid cache misses, and also be able to run
whilst the cache is disabled (such as when writing to SPI Flash). Note that if this option is enabled: -
Users should also set the ESP_INTR_FLAG_IRAM in the driver configuration structure when installing
the driver (see docs for specifics). - Alert logging (i.e., setting of the TWAI_ALERT_AND_LOG flag)
will have no effect.
Default value:
• No (disabled)
UART configuration Contains:
• CONFIG_UART_ISR_IN_IRAM
CONFIG_UART_ISR_IN_IRAM
Place UART ISR function into IRAM
Found in: Component config > Driver configurations > UART configuration
If this option is not selected, UART interrupt will be disabled for a long time and may cause data lost
when doing spi flash operation.
Default value:
• No (disabled)
GDMA Configuration Contains:
• CONFIG_GDMA_ISR_IRAM_SAFE
• CONFIG_GDMA_CTRL_FUNC_IN_IRAM
CONFIG_GDMA_CTRL_FUNC_IN_IRAM
Place GDMA control functions into IRAM
Found in: Component config > Driver configurations > GDMA Configuration
Place GDMA control functions (like start/stop/append/reset) into IRAM, so that these functions can be
IRAM-safe and able to be called in the other IRAM interrupt context. Enabling this option can improve
driver performance as well.
Default value:
• No (disabled)
CONFIG_GDMA_ISR_IRAM_SAFE
GDMA ISR IRAM-Safe
Found in: Component config > Driver configurations > GDMA Configuration
This will ensure the GDMA interrupt handler is IRAM-Safe, allow to avoid flash cache misses, and also
be able to run whilst the cache is disabled. (e.g. SPI Flash write).
Default value:
• No (disabled)
Espressif Systems 1093
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