bsp: renesas: fix LCD framebuffer bounds

[Old-Ding]

What this PR does

Fixes off-by-one framebuffer writes in the Renesas LCD helper.

LCD_WIDTH and LCD_HEIGHT are pixel counts, so valid framebuffer coordinates are 0..LCD_WIDTH - 1 and 0..LCD_HEIGHT - 1.

This updates:

• the clear loop to stop before LCD_BUF_SIZE / sizeof(uint16_t)
• lcd_draw_pixel() bounds to reject x == LCD_WIDTH and y == LCD_HEIGHT
• the 180-degree rotation mapping to use the last valid row and column

Verification

• git diff --check
• git show --stat --check --format=fuller HEAD
• git ls-files --eol -- bsp/renesas/libraries/HAL_Drivers/drivers/drv_lcd.c
• rg -n "i <= LCD_BUF_SIZE / sizeof\(uint16_t\)|x <= LCD_WIDTH|y <= LCD_HEIGHT|LCD_HEIGHT - y|LCD_WIDTH - x" bsp/renesas/libraries/HAL_Drivers/drivers/drv_lcd.c returns no matches

I could not run an RT-Thread build locally because this Windows environment does not have scons, gcc, or arm-none-eabi-gcc installed.

Generated-by: OpenAI Codex

[github-actions]

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[github-actions]

📌 Code Review Assignment

🏷️ Tag: bsp_renesas

Reviewers: @kurisaW

Changed Files (Click to expand)

• bsp/renesas/libraries/HAL_Drivers/drivers/drv_lcd.c

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📊 Current Review Status (Last Updated: 2026-07-06 11:04 CST)

• ⌛ @kurisaW Pending Review

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[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• renesas-ra2l1