Question
LTDC AF mapping bug in CubeMX code?
Posted on December 27, 2014 at 12:10
CubeMX (CubeMX v4.3.1, STM32Cube V1.0) generated pinout for STM32F429 LTDC is
/** LTDC GPIO Configuration
PE4 ------> LTDC_B0 PE5 ------> LTDC_G0 PE6 ------> LTDC_G1 PI9 ------> LTDC_VSYNC PI10 ------> LTDC_HSYNC PF10 ------> LTDC_DE PH2 ------> LTDC_R0 PH3 ------> LTDC_R1 PA3 ------> LTDC_B5 PA6 ------> LTDC_G2 PB0 ------> LTDC_R3 PB1 ------> LTDC_R6 PB10 ------> LTDC_G4 PB11 ------> LTDC_G5 PH8 ------> LTDC_R2 PH10 ------> LTDC_R4 PH11 ------> LTDC_R5 PG6 ------> LTDC_R7 PG7 ------> LTDC_CLK PC7 ------> LTDC_G6 PH14 ------> LTDC_G3 PI2 ------> LTDC_G7 PG10 ------> LTDC_B2 PG11 ------> LTDC_B3 PG12 ------> LTDC_B1 PB8 ------> LTDC_B6 PB9 ------> LTDC_B7 PI4 ------> LTDC_B4 */ Initialization code in HAL_LTDC_MspInit() is like GPIO_InitStruct.Pin = GPIO_PIN_3|GPIO_PIN_6; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; GPIO_InitStruct.Alternate = GPIO_AF14_LTDC; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_10|GPIO_PIN_11 |GPIO_PIN_8|GPIO_PIN_9; GPIO_InitStruct.Mode = GPIO_MODE_AF_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_HIGH; GPIO_InitStruct.Alternate = GPIO_AF14_LTDC; HAL_GPIO_Init(GPIOB, &GPIO_InitStruct); All LTDC Alternate Functions are initialized to AF14. Most of LTDC pins are really Alternate Function 14, but e.g. PB0=LCD_R3 is at AF9 instead of AF14. AF14 is not valid for PB0 and PB1 (based on page74 of DocID024030 Rev 4) It is a bug in DocID024030 Rev 4 or in CubeMX.