diff --git a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/headstage.h b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/headstage.h
index 19dda881b..ab79bf571 100644
--- a/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/headstage.h
+++ b/simplelink/ble_sdk_2_02_02_25/src/examples/simple_peripheral/cc26xx/app/headstage/headstage.h
@@ -664,7 +664,7 @@ static uint8_t *spi_transact_rec_instruction();
  * send instruction to Z meter
  */
 // static void spi_DAC_transact_instruction();
-static void ADC_SPI(uint16_t ADCin);
+static void ADC_SPI(uint8_t ADCin);
 
 /**
  * update the instruction of ADC control register
@@ -1292,7 +1292,7 @@ static void ZM_spi_transaction(uint8_t length, uint8_t *spi_txbuf, uint8_t *spi_
 }
 
 // for LED
-static void LED_spi_transaction(uint8_t length, uint16_t *spi_txbuf, uint16_t *spi_rxbuf) {
+static void LED_spi_transaction(uint8_t length, uint16_t *spi_txbuf, uint8_t *spi_rxbuf) {
     LED_transaction.count = length;
     LED_transaction.txBuf = spi_txbuf;
     LED_transaction.rxBuf = spi_rxbuf;