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drivers: ssd16xx: derive buffer length from width and height attributes

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Derive buffer length from width and height attributes and
do not use buf_size direct.

Signed-off-by: Johann Fischer <j.fischer@phytec.de>
This commit is contained in:
Johann Fischer 2019-12-18 10:24:55 +01:00 • committed by Carles Cufí
commit 5c48c2132d
1 changed files with 4 additions and 2 deletions
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6
drivers/display/ssd16xx.c
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@ -231,6 +231,7 @@ static int ssd16xx_write(const struct device *dev, const u16_t x,
{ {
struct ssd16xx_data *driver = dev->driver_data; struct ssd16xx_data *driver = dev->driver_data;
int err; int err;
size_t buf_len;
u16_t x_start; u16_t x_start;
u16_t x_end; u16_t x_end;
u16_t y_start; u16_t y_start;
@ -241,7 +242,8 @@ static int ssd16xx_write(const struct device *dev, const u16_t x,
return -EINVAL; return -EINVAL;
} }
if (buf == NULL || desc->buf_size == 0U) { buf_len = MIN(desc->buf_size, desc->height * desc->width / 8);
if (buf == NULL || buf_len == 0U) {
LOG_ERR("Display buffer is not available"); LOG_ERR("Display buffer is not available");
return -EINVAL; return -EINVAL;
} }
@ -311,7 +313,7 @@ static int ssd16xx_write(const struct device *dev, const u16_t x,
} }
err = ssd16xx_write_cmd(driver, SSD16XX_CMD_WRITE_RAM, (u8_t *)buf, err = ssd16xx_write_cmd(driver, SSD16XX_CMD_WRITE_RAM, (u8_t *)buf,
desc->buf_size); buf_len);
if (err < 0) { if (err < 0) {
return err; return err;
} }