S2DP_PIC12F509

S2DP_PIC12F509 is a simple serial data programmer which runs on PIC12F509. It controls four system signals, DATA, CLOCK, WP_, and RESET_, on boot-time using GIPO as follows: *1

Set direction of the GPIO into INPUT
Wait RESET_ turn into HIGH (disabled)
Set direction of the GPIO into OUTPUT
Set RESET_ into LOW (enabled) and WP_ into HIGH (unprotected)
Write data one bit by one bit using DATA and CLOCK
Set direction of the GPIO into INPUT again
Sleep

*1 Expect that DATA, CLOCK, and WP_ are pull-downed and RESET_ is pull-upped

PIC12F509 Pin Assign

1 VDD
2 GP5: DATA
- Should be pull-downed
3 GP4: WP_
- Should be pull-downed
4 GP3: Unused (INPUT)
5 GP2: RESET_
- Should be pull-upped
6 GP1: CLOCK
- Should be pull-downed
7 GP0: Unused (OUTPUT with LOW)
8 VSS

Typical Application Circuit

How to Build

Setup Toolchain

Download and install MPLAB X IDE.

https://www.microchip.com/mplab/mplab-x-ide

Download and install MPLAB XC8 Compiler.

https://www.microchip.com/mplab/compilers

Startup MPLAB X IDE.

Create S2DP Project

Select New Project... from File menu.

Select Microchip Embedded from Categories: and Standalone Project from Projects:.

Select PIC12F509 as Device:.

Do nothing. Just press Next >.

Select using PIC writer if you have. If you use universal programmer such as TL866CS, select PICKit3 or something.

Select XC8 as a compiler.

Enter project name, e.g, S2DP, in Project Name:

Project S2DP has been created.

Compile S2DP

Download main.c from GitHub repository.

Import main.c into the project. Right click Source Files of the project tree of S2DP, select Add Existing Item... and select downloaded main.c file.

If main.c is imported successfully, it would appear in Source Files.

Double click main.c and show it in the right area.

Press the hammer icon to test the compiler.

If compiled successfully, the following message is shown in the right bottom area

make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf
make[1]: Entering directory 'C:/Users/yourname/MPLABXProjects/S2DP.X'
make  -f nbproject/Makefile-default.mk dist/default/production/S2DP.X.production.hex
make[2]: Entering directory 'C:/Users/yourname/MPLABXProjects/S2DP.X'

....

BUILD SUCCESSFUL (total time: 2s)
Loading code from C:/Users/yourname/MPLABXProjects/S2DP.X/dist/default/production/S2DP.X.production.hex...
Loading completed

C:/Users/yourname/MPLABXProjects/S2DP.X/dist/default/production/S2DP.X.production.hex is a file to be programmed to PIC device.

Focus on main.c. Replace both DATALEN and DATA macro with an appropriate value what you want to program.

Before:

#define DATALEN 16
#define DATA {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}

After (example with 12Byte data):

#define DATALEN 12
#define DATA {0x48,0x65,0x6C,0x6C,0x6F,0x20,0x57,0x6F,0x72,0x6C,0x64,0x00}

Build again. Press the hammer icon.

If successfully built, a hex file is appeared in the output directory after the following message is shown.

make -f nbproject/Makefile-default.mk SUBPROJECTS= .build-conf
make[1]: Entering directory 'C:/Users/yourname/MPLABXProjects/S2DP.X'
make  -f nbproject/Makefile-default.mk dist/default/production/S2DP.X.production.hex
make[2]: Entering directory 'C:/Users/yourname/MPLABXProjects/S2DP.X'

....

BUILD SUCCESSFUL (total time: 2s)
Loading code from C:/Users/yourname/MPLABXProjects/S2DP.X/dist/default/production/S2DP.X.production.hex...
Loading completed

How to Write Program to PIC Device

This document shows the way to write compiled program to PIC device with TL866CS as an example. If you are using another PIC writer, please follow its usage.

Startup MiniPro Programmer.