altos: Bump ST7565 speed to 20MHz

Go as fast as we can manage

Signed-off-by: Keith Packard <keithp@keithp.com>

diff --git a/src/drivers/ao_st7565.h b/src/drivers/ao_st7565.h
index 1dad97cc72d7ca2619a3bf13917f4760a53b2638..b5627f3be24cf8340c949ddf19fc8f78b56eb54f 100644 (file)
--- a/src/drivers/ao_st7565.h
+++ b/src/drivers/ao_st7565.h
@@ -81,7 +81,8 @@
 #define ST7565_BOOSTER_RATIO_SET               0xf8
 #define ST7565_NOP                             0xe3
 
-#define AO_ST7565_SPI_SPEED                    ao_spi_speed(AO_ST7565_SPI_BUS, 10000000)
+/* Max 50ns SPI clock time */
+#define AO_ST7565_SPI_SPEED                    ao_spi_speed(AO_ST7565_SPI_BUS, 20000000)
 
 void
 ao_st7565_update(struct ao_bitmap *bitmap);