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drivers: ssd16xx: rework function to clear panel buffer at init 

Rework function to clear panel buffer to use less memory
and propagate the errors.

Signed-off-by: Johann Fischer <johann.fischer@nordicsemi.no>
This commit is contained in:
Johann Fischer 2022-03-09 15:49:36 +01:00 committed by Carles Cufí
parent e36c2699e4
commit 75fb9ee143
1 changed files with 24 additions and 16 deletions
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40
drivers/display/ssd16xx.c
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@ -378,7 +378,8 @@ static int ssd16xx_clear_cntlr_mem(const struct device *dev, uint8_t ram_cmd,
uint16_t panel_h = config->height / EPD_PANEL_NUMOF_ROWS_PER_PAGE;
uint16_t last_gate = config->width - 1;
uint8_t scan_mode = SSD16XX_DATA_ENTRY_XIYDY;
uint8_t clear_page[256]; /* User large array for now */
uint8_t clear_page[64];
int err;
/*
* Clear unusable memory area when the resolution of the panel is not
@ -388,28 +389,35 @@ static int ssd16xx_clear_cntlr_mem(const struct device *dev, uint8_t ram_cmd,
panel_h += 1;
}
if (ssd16xx_write_cmd(dev, SSD16XX_CMD_ENTRY_MODE, &scan_mode, 1)) {
return -EIO;
err = ssd16xx_write_cmd(dev, SSD16XX_CMD_ENTRY_MODE, &scan_mode, 1);
if (err < 0) {
return err;
}
if (ssd16xx_set_ram_param(dev, SSD16XX_PANEL_FIRST_PAGE,
panel_h - 1,
last_gate,
SSD16XX_PANEL_FIRST_GATE)) {
return -EIO;
err = ssd16xx_set_ram_param(dev, SSD16XX_PANEL_FIRST_PAGE,
panel_h - 1, last_gate,
SSD16XX_PANEL_FIRST_GATE);
if (err < 0) {
return err;
}
if (ssd16xx_set_ram_ptr(dev, SSD16XX_PANEL_FIRST_PAGE,
last_gate)) {
return -EIO;
err = ssd16xx_set_ram_ptr(dev, SSD16XX_PANEL_FIRST_PAGE, last_gate);
if (err < 0) {
return err;
}
memset(clear_page, 0xff, sizeof(clear_page));
for (int i = 0; i < panel_h; i++) {
if (ssd16xx_write_cmd(dev, ram_cmd, clear_page,
sizeof(clear_page))) {
return -EIO;
for (int h = 0; h < panel_h; h++) {
size_t x = config->width;
while (x) {
size_t l = MIN(x, sizeof(clear_page));
x -= l;
err = ssd16xx_write_cmd(dev, ram_cmd, clear_page, l);
if (err < 0) {
return err;
}
}
}