1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpio/pca9555.h b/drivers/gpio/pca9555.h
index ebb97e2f3..3341ec3eb 100644
--- a/drivers/gpio/pca9555.h
+++ b/drivers/gpio/pca9555.h
@@ -53,3 +53,5 @@ void pca9555_set_config(uint8_t slave_addr, uint8_t port, uint8_t conf);
 void pca9555_set_output(uint8_t slave_addr, uint8_t port, uint8_t conf);
 
 uint8_t pca9555_readPins(uint8_t slave_addr, uint8_t port);
+
+uint16_t pca9555_readAllPins(uint8_t slave_addr);