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Add note about drive capability for GPIO pins in SPI slave example

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brahim ghouma
2025-08-09 11:09:03 +01:00
committed by wanckl
parent 4e036983a7
commit b9bb6b5aa4
1 changed files with 17 additions and 0 deletions
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17
examples/peripherals/spi_slave/receiver/main/app_main.c
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@@ -92,6 +92,23 @@ void app_main(void)
gpio_set_pull_mode(GPIO_SCLK, GPIO_PULLUP_ONLY);
gpio_set_pull_mode(GPIO_CS, GPIO_PULLUP_ONLY);
/**
* The default drive capability on esp32 is GPIO_DRIVE_CAP_2 (~20 mA).
* When connecting master devices that uses a source/sink current lower or higher than GPIO_DRIVER_CAP_DEFAULT.
* Using a drive strength that does not match the requirements of the connected device can cause issues
* such as unreliable switching, or damage to the GPIO pin or external device.
*
* - GPIO_DRIVE_CAP_0: ~5 mA
* - GPIO_DRIVE_CAP_1: ~10 mA
* - GPIO_DRIVE_CAP_2: ~20 mA
* - GPIO_DRIVE_CAP_3: ~40 mA
gpio_set_drive_capability(GPIO_MOSI, GPIO_DRIVE_CAP_3);
gpio_set_drive_capability(GPIO_SCLK, GPIO_DRIVE_CAP_3);
gpio_set_drive_capability(GPIO_CS, GPIO_DRIVE_CAP_3);
**/
//Initialize SPI slave interface
ret = spi_slave_initialize(RCV_HOST, &buscfg, &slvcfg, SPI_DMA_CH_AUTO);
assert(ret == ESP_OK);