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drivers: ssd1306: Optimize display commands

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This change removes the interleaving control
frames.
Additionally all I2C accesses are centralized in
one single function.

Signed-off-by: Marco Peter <marco@peter-net.ch>
This commit is contained in:
Marco Peter 2020-09-11 20:39:29 +02:00 • committed by Carles Cufí
commit fd2087e080
2 changed files with 38 additions and 101 deletions
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8
drivers/display/ssd1306_regs.h
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@ -8,9 +8,13 @@
#ifndef __SSD1306_REGS_H__
#define __SSD1306_REGS_H__
#define SSD1306_CONTROL_LAST_BYTE_CMD 0x00
#define SSD1306_CONTROL_LAST_BYTE_DATA 0x40
/* All following bytes will contain commands */
#define SSD1306_CONTROL_ALL_BYTES_CMD 0x00
/* All following bytes will contain data */
#define SSD1306_CONTROL_ALL_BYTES_DATA 0x40
/* The next byte will contain a command */
#define SSD1306_CONTROL_BYTE_CMD 0x80
/* The next byte will contain data */
#define SSD1306_CONTROL_BYTE_DATA 0xc0
#define SSD1306_READ_STATUS_MASK 0xc0
#define SSD1306_READ_STATUS_BUSY 0x80