---
title: HwProgramFlowControl
framework: serialdriverkit
role: symbol
role_heading: Instance Method
path: serialdriverkit/iouserserial/hwprogramflowcontrol
---

# HwProgramFlowControl

## Declaration

```occ
virtual kern_return_t HwProgramFlowControl(uint32_t arg, uint8_t xon, uint8_t xoff);
```