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Update ssd1306.c

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Comments correction.
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Marián 2021-07-21 07:19:58 +02:00 committed by GitHub
parent 9a6f79cbfb
commit 5cc3e2a91d
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1 changed files with 21 additions and 19 deletions
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lib/ssd1306.c
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@ -106,7 +106,6 @@ const uint8_t INIT_SSD1306[] PROGMEM = {
// number of initializers
18,
// 0xAE = Set Display OFF
// -----------------------------------
0, SSD1306_DISPLAY_OFF,
// 0xA8
1, SSD1306_SET_MUX_RATIO, 0x3F,
@ -151,7 +150,6 @@ const uint8_t INIT_SSD1306[] PROGMEM = {
// 0x8D
1, SSD1306_SET_CHAR_REG, 0x14,
// 0xAF = Set Display ON
// -----------------------------------
0, SSD1306_DISPLAY_ON
};
@ -194,7 +192,7 @@ uint8_t SSD1306_Init (uint8_t address)
return status;
}
// loop throuh commands
// loop through commands
while (no_of_commands) {
// number of arguments
@ -317,7 +315,7 @@ uint8_t SSD1306_NormalScreen (uint8_t address)
// TWI: start & SLAW
// -------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -326,7 +324,7 @@ uint8_t SSD1306_NormalScreen (uint8_t address)
// send command
// -------------------------
status = SSD1306_Send_Command (SSD1306_DIS_NORMAL);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -351,7 +349,7 @@ uint8_t SSD1306_InverseScreen (uint8_t address)
// TWI: start & SLAW
// -------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -360,7 +358,7 @@ uint8_t SSD1306_InverseScreen (uint8_t address)
// send command
// -------------------------
status = SSD1306_Send_Command (SSD1306_DIS_INVERSE);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -387,7 +385,7 @@ uint8_t SSD1306_UpdateScreen (uint8_t address)
// TWI: start & SLAW
// -------------------------
status = SSD1306_Send_StartAndSLAW (address);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -396,18 +394,18 @@ uint8_t SSD1306_UpdateScreen (uint8_t address)
// control byte data stream
// -------------------------
status = TWI_MT_Send_Data (SSD1306_DATA_STREAM);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
}
// erase whole area
// send cache memory lcd
// -------------------------
while (i < CACHE_SIZE_MEM) {
// send null data
// send data
status = TWI_MT_Send_Data (cacheMemLcd[i]);
// request - start TWI
// request succesfull
if (SSD1306_SUCCESS != status) {
// error
return status;
@ -424,7 +422,7 @@ uint8_t SSD1306_UpdateScreen (uint8_t address)
}
/**
* @desc SSD1306 Send Command
* @desc SSD1306 Clear screen
*
* @param void
*
@ -446,12 +444,12 @@ void SSD1306_ClearScreen (void)
*/
void SSD1306_SetPosition (uint8_t x, uint8_t y)
{
// counter
// calculate counter
_counter = x + (y << 7);
}
/**
* @desc SSD1306 Check Text Poisition
* @desc SSD1306 Update text poisition - this ensure that character will not be divided at the end of row, the whole character will be depicted on the new row
*
* @param void
*
@ -459,29 +457,32 @@ void SSD1306_SetPosition (uint8_t x, uint8_t y)
*/
uint8_t SSD1306_UpdTxtPosition (void)
{
// check end column position
// y / 8
uint8_t y = _counter >> 7;
// y % 8
uint8_t x = _counter - (y << 7);
// x + character length + 1
uint8_t x_new = x + CHARS_COLS_LENGTH + 1;
// check position
if (x_new > END_COLUMN_ADDR) {
// if more than numbre of pages
// if more than allowable number of pages
if (y > END_PAGE_ADDR) {
// return out of range
return SSD1306_ERROR;
// if x out reach end but page in range
// if x reach the end but page in range
} else if (y < (END_PAGE_ADDR-1)) {
// update
_counter = ((++y) << 7);
}
}
// success
return SSD1306_SUCCESS;
}
/**
* @desc Draw character
* @desc SSD1306 Draw character
*
* @param char character
*
@ -493,6 +494,7 @@ uint8_t SSD1306_DrawChar (char character)
uint8_t i = 0;
// update text position
// this ensure that character will not be divided at the end of row, the whole character will be depicted on the new row
if (SSD1306_UpdTxtPosition () == SSD1306_ERROR) {
// error
return SSD1306_ERROR;