DMA Performance Test with STM32L031

Constructor	SysClk	Transfer	FPS	BSS (RAM)
uc1609_slg19264_f	2MHz	SW SPI	0.3	1692
uc1609_slg19264_f	2MHz	HW SPI	4.7	1692
uc1609_slg19264_f	2MHz	DMA SPI	5.0	1948
uc1609_slg19264_1	2MHz	SW SPI	0.3	348
uc1609_slg19264_1	2MHz	HW SPI	2.6	348
uc1609_slg19264_1	2MHz	DMA SPI	2.6	604

Constructor	SysClk	Transfer	FPS	BSS (RAM)
uc1609_slg19264_f	32MHz	SW SPI	6.0	1692
uc1609_slg19264_f	32MHz	HW SPI	73.8	1692
uc1609_slg19264_f	32MHz	DMA SPI	76.7	1948
uc1609_slg19264_1	32MHz	SW SPI	5.6	348
uc1609_slg19264_1	32MHz	HW SPI	39.6	348
uc1609_slg19264_1	32MHz	DMA SPI	40.7	604

See also https://github.com/olikraus/u8g2/issues/2564

GPIO	Display	Color
PA14	CD	brown
PA13	CS	yellow
PA7	MOSI	green
PA6	Reset	white
PA5	SCK	purple