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5 years ago.
Hard Fault w/ RA8875 & GSL1680 CTP on STM32F401RE Board
I'm running this code,
Import programPUB_RA8875_Touch
A Touchscreen example program showing the RA8875 driver library. This is easily configured for either the Resistive touch panel or the Capacitive touch panel.
Last commit 29 Mar 2020 by 
David Smart
on a NUCLEO-64 STM32F401RE board. I've run other tests and so far it appears that the screen writing functions are working well. I was trying to get the CTP (Capacitive Touch Panel) working with the www.buydisplay.com 5" LCD (https://www.buydisplay.com/default/5-inch-tft-lcd-display-capacitive-touchscreen-ra8875-controller-800x480).
I ran the PUB_RA8875_TouchColors demo code and that does seem to work as I'm seeing RGB color codes written to the serial port when I touch a color. Each touch sends multiple responses but that's a different issue.
This tells me that my hardware connections are correct (I also ran a completely different sample code using the Arduino IDE and that worked perfectly with the same hardware connections.
The only change in the code I made was the pin definitions:
Changes to Code
//RA8875 lcd(p5, p6, p7, p12, NC, p9,p10,p13, "tft");
// SPI:{MOSI,MISO,SCK,/ChipSelect,/reset}, I2C:{SDA,SCL,/IRQ}, name
RA8875 lcd(PA_7,PA_6,PA_5,PB_6,PC_7, PB_9,PB_8,PB_10,PA_8, "tft"); //For Nucleo-F401RE
The hard fault I get when I run the PUB_RA8875_Touch code is this:
Serial Port Output with Hard Fault
RA8875 Touch Screen Example - Build Nov 7 2019 21:23:06
++ MbedOS Fault Handler ++
FaultType: HardFault
Context:
R0 : 20017FCC
R1 : 0800 AFC5
R2 : 0800AFC6
R3 : 0000003A
R4 : 00000002
R5 : 00000003
R6 : 0FFFFFFF
R 7 : 00000032
R8 : 0000000F
R9 : 20018008
R10 : 00000001
R11 : 00000001
R12 : 0000003A
SP : 20017FB8
LR : 0800112D
PC : 0800AE56
xPSR : 01000000
PSP : 0000 0000
MSP : 20017F50
CPUID: 410FC241
HFSR : 40000000
MMFSR: 00000000
BFSR : 00000082
U FSR : 00000000
DFSR : 00000008
AFSR : 00000000
BFAR : 20018008
Mode : Thread
Priv : P rivileged
Stack: MSP
-- MbedOS Fault Handler --
++ MbedOS Error Info ++
Error Status : 0x80FF013D Code: 317 Module: 255
Error Message: Fault exception
Location: 0x800B 05F
Error Value: 0x800AE56
For more info, visit: https://armmbed.github.io/mbedos- error/?error=0x80FF013D
-- MbedOS Error Info --
Any help debugging why this hard fault is happening would be greatly appreciated!
Thanks, George
1 Answer
5 years ago.
Hi
Maybe check if you are using correct pins in
Jerome