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AN84858
PSoC 4 Programming Using an External
Microcontroller (HSSP)
About this document
Scope and purpose
AN84858 shows you how to implement PSoC ™ 4 device programming with an external microcontroller by using
modular C code. In this process, called Host Sourced Serial Programming (HSSP), the host microcontroller
programs PSoC 4 through the serial wire debug (SWD) interface. The C code is written so that it can be ported to
any microcontroller with minimal changes, speeding up HSSP application development for PSoC 4.
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Table of contents
About this document ....................................................................................................................... 1
Table of contents ............................................................................................................................ 1
1 Introduction .......................................................................................................................... 3
1.1 Types of Programmers ............................................................................................................................ 3
1.2 Terms and Definitions ............................................................................................................................. 3
2 HSSP Firmware Architecture ................................................................................................... 5
2.1 SWD Protocol Physical Layer .................................................................................................................. 6
2.2 SWD Protocol Packet Layer ..................................................................................................................... 6
2.3 Fetching Programming Data ................................................................................................................... 6
2.4 HSSP Programming Steps ....................................................................................................................... 7
2.5 HSSP Timeout Parameters ..................................................................................................................... 7
2.6 HSSP Programming Data ........................................................................................................................ 8
2.7 Main Application Code ............................................................................................................................ 8
2.8 HSSP Error Status .................................................................................................................................... 8
3 Hardware Connections for HSSP Programming ........................................................................ 10
4 Porting the HSSP Application to a Host Programmer ................................................................. 11
4.1 Files That Must Be Ported ..................................................................................................................... 11
4.2 Code Changes Required While Porting ................................................................................................. 11
5 Calculating HSSP Timeout Parameters .................................................................................... 13
5.1 DEVICE_ACQUIRE_TIMEOUT ................................................................................................................. 13
5.2 SROM_POLLING_TIMEOUT ................................................................................................................... 14
5.3 XRES_PULSE_100US ............................................................................................................................. 15
6 Interface for Receiving HSSP Programming Data ...................................................................... 17
7 HSSP Timing Validation ......................................................................................................... 19
8 Power Cycle Mode Programming............................................................................................. 20
9 Testing the Example Projects ................................................................................................. 21
9.1 For CY8CKIT-038 PSoC 4 Development Kit ........................................................................................... 21