More info....
If I transfer a small image (5x1) pixels, it writes (8 x 1 pixels) FAILED
If I transfer a small image (8x1) pixels, it writes (8 x 1 pixels) <<< this worked
If I transfer a small image (4x1) pixels, it writes (4 x 1 pixels) <<< this worked
If I transfer a small image (1x1) pixels, it writes (4 x 1 pixels) FAILED
If I transfer a small image (12 x 1) pixels, it writes (12 x 1 pixels) <<< this worked
If I transfer a small image (11 x 2) pixels, it writes (14 x 2 pixels) <<< FAILED weird result
if I transfer a small image (12 x 2) pixels, it writes (12 x 2 pixels) <<< this worked
The DMA2d hardware seems very flakey and unpredictable. After running these tests, I thought there was a min width of 4 pixels, but the (11 x 2) image blew that pattern. (and yes it is repeatable).
Does anyone have any ideas? I know the H743 has over 80 pages of errata's, if I migrate to another processor (ie the new N657), will the DMA2D work on that version of silicon?
Test code:
/*******************************************************************************
* LCD Fill - fill rectangle with a single color
******************************************************************************/
void LCD_ILI9488_Fill(uint16_t x1, uint16_t y1, uint16_t x2, uint16_t y2, uint32_t color) {
LCD_ILI9488_SetWindow(x1, y1, x2-1, y2-1);
HAL_StatusTypeDef ret;
if(HAL_DMA2D_Start(&hdma2d, color, 0x64000000, (x2-x1), (y2-y1)) != HAL_OK) {
syslog(SYSLOG_ERROR, "DMA start error");
}
ret = HAL_DMA2D_PollForTransfer(&hdma2d, 50);
if (ret != HAL_OK) {
syslog(SYSLOG_ERROR, "DMA2D poll error");
while(1);
}
