Basic Infos

• This issue complies with the issue POLICY doc.
• I have read the documentation at readthedocs and the issue is not addressed there.
• I have tested that the issue is present in current master branch (aka latest git).
• I have searched the issue tracker for a similar issue.
• If there is a stack dump, I have decoded it.
• I have filled out all fields below.

Platform

• Hardware: [ESP8266]
• Core Version: [3.0.2]
• Development Env: [Arduino IDE]
• Operating System: [Windows]

Settings in IDE

• Module: [Generic ESP8266]
• Flash Mode: []
• Flash Size: [4MB]
• lwip Variant: [v2 Lower Memory]
• Reset Method: [nodemcu]
• Flash Frequency: [40Mhz]
• CPU Frequency: [80Mhz]
• Upload Using: [SERIAL]
• Upload Speed: [115200] (serial upload only)

Problem Description

In SPI library [SPIClass::writePattern] does not draw the last 8 bytes if repeatRem == 0 in line [518 setDataBits(repeatRem * 8);]. I found this problem on the LCD screen GC9A01. The solution is to add a null check for [repeatRem]:

if (repeatRem)
{
setDataBits(repeatRem * 8);
SPI1CMD |= SPIBUSY;
while(SPI1CMD & SPIBUSY) {}
}

I hope this is a simple patch.