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+--- Thread: Lesson20- how to use PCF8574 IIC extend GPIO for ESP32 input ports (/showthread.php?tid=838)
Lesson20- how to use PCF8574 IIC extend GPIO for ESP32 input ports - admin - 10-10-2021
Arduino IDE source code:
PCF8574-DI.zip (Size: 806 bytes / Downloads: 631)
RE: Lesson20- how to use PCF8574 IIC extend GPIO for ESP32 input ports - lonejan - 08-16-2024
Dear admin, how did u set 26 and 29 as i2c pins? I'm stuck on settings these pins as SDA & SCL((( I found in soc_caps.h this code:
// 0~39 valid except 24, 28~31
#define SOC_GPIO_VALID_GPIO_MASK (0xFFFFFFFFFFULL & ~(0ULL | BIT24 | BIT28 | BIT29 | BIT30 | BIT31))
// GPIO >= 34 are input only
#define SOC_GPIO_VALID_OUTPUT_GPIO_MASK (SOC_GPIO_VALID_GPIO_MASK & ~(0ULL | BIT34 | BIT35 | BIT36 | BIT37 | BIT38 | BIT39))
29 pin is denied to use
pls help)
RE: Lesson20- how to use PCF8574 IIC extend GPIO for ESP32 input ports - admin - 08-17-2024
these are i2c bus pin define for KC868-A8:
IIC SDA:4
IIC SCL:5