From: Nathael Pajani <nathael.pajani@ed3l.fr>
Date: Sun, 19 Mar 2017 18:35:18 +0000 (+0100)
Subject: Add support for displays without an external VCC (use internal charge pump)
X-Git-Url: http://git.techno-innov.fr/?a=commitdiff_plain;h=7361a13180e1ad867e8dc06dd0763da409641eaa;p=soft%2Flpc122x%2Fcore

Add support for displays without an external VCC (use internal charge pump)
---

diff --git a/extdrv/ssd130x_oled_driver.c b/extdrv/ssd130x_oled_driver.c
index f8b2d20..06c0d68 100644
--- a/extdrv/ssd130x_oled_driver.c
+++ b/extdrv/ssd130x_oled_driver.c
@@ -261,16 +261,23 @@ int ssd130x_display_off(struct oled_display* conf)
 int ssd130x_display_on(struct oled_display* conf)
 {
 	int ret = 0;
+	uint8_t val = 0;
 
 	/* Display OFF */
-	ret = ssd130x_display_power(conf, SSD130x_DISP_OFF);
+	ret = ssd130x_display_power(conf, SSD130x_DISP_OFF);  /* 0xAE */
 	if (ret != 0) {
 		return ret;
 	}
+	if (conf->charge_pump == SSD130x_INTERNAL_PUMP) {
+		val = SSD130x_CMD_CHARGE_INTERN;
+		ssd130x_send_command(conf, SSD130x_CMD_CHARGE_PUMP, &val, 1); /* 0x8D */
+	}
+
 	ret = ssd130x_set_mem_addressing_mode(conf, SSD130x_ADDR_TYPE_HORIZONTAL);
 	if (ret != 0) {
 		return ret;
 	}
+
 	ret = ssd130x_set_scan_direction(conf);
 	if (ret != 0) {
 		return ret;
@@ -279,6 +286,14 @@ int ssd130x_display_on(struct oled_display* conf)
 	if (ret != 0) {
 		return ret;
 	}
+
+	if (conf->charge_pump == SSD130x_INTERNAL_PUMP) {
+		val = 0xF1;
+		ssd130x_send_command(conf, SSD130x_CMD_SET_PRECHARGE, &val, 1); /* 0xD9 */
+		val = SSD130x_VCOM_083;
+		ssd130x_send_command(conf, SSD130x_CMD_VCOM_LEVEL, &val, 1);  /* 0xDB */
+	}
+
 	ret = ssd130x_set_display_on(conf, SSD130x_DISP_RAM);
 	if (ret != 0) {
 		return ret;
diff --git a/include/extdrv/ssd130x_oled_driver.h b/include/extdrv/ssd130x_oled_driver.h
index 19f055d..8552c39 100644
--- a/include/extdrv/ssd130x_oled_driver.h
+++ b/include/extdrv/ssd130x_oled_driver.h
@@ -33,6 +33,7 @@ struct oled_display {
 	uint8_t address; /* 8 bits address */
 	uint8_t bus_num; /* I2C bus number */
 	uint8_t probe_ok;
+	uint8_t charge_pump;
 	uint8_t video_mode;
 	uint8_t contrast;
 	uint8_t scan_dir;
@@ -121,6 +122,13 @@ enum ssd130x_defs {
 #define SSD130x_ADDR_COL(x)       ((x) & 0x7F)
 #define SSD130x_ADDR_PAGE(x)      ((x) & 0x07)
 
+/* Charge pump */
+#define SSD130x_EXT_VCC       0x01
+#define SSD130x_INTERNAL_PUMP 0x00
+#define SSD130x_CMD_CHARGE_PUMP    0x8D
+#define SSD130x_CMD_CHARGE_EXT     0x10
+#define SSD130x_CMD_CHARGE_INTERN  0x14
+
 /* Hardware configuration */
 #define SSD130x_CMD_START_LINE(x)      (0x40 + ((x) & 0x3F))
 #define SSD130x_CMD_SEG0_MAP_RIGHT     0xA1