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avr-lcd-lib
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Clean up and comment lcdLib.c 

Signed-off-by: Collin J. Doering <collin.doering@rekahsoft.ca>
This commit is contained in:
Collin J. Doering 2015-10-19 04:58:03 -04:00
parent 4f9462e983
commit f7893b7f88
1 changed files with 13 additions and 11 deletions
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14
lcdLib.c
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@ -13,7 +13,7 @@
* *
* You should have received a copy of the GNU General Public License * You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>. * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/ */
/** /**
* File: lcdLib.c * File: lcdLib.c
@ -141,7 +141,7 @@ void writeLCDByte_(uint8_t b) {
and EIGHT_BIT_ARBITRARY_PIN_MODE, the given data is written in one cycle using the and EIGHT_BIT_ARBITRARY_PIN_MODE, the given data is written in one cycle using the
writeLCDByte_ function. In FOUR_BIT_MODE however, the given data is written in two cycles writeLCDByte_ function. In FOUR_BIT_MODE however, the given data is written in two cycles
using two successive calls to the writeLCDNibble_ function. using two successive calls to the writeLCDNibble_ function.
*/ */
void writeLCDInstr_(uint8_t instr) { void writeLCDInstr_(uint8_t instr) {
LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0 LCD_RS_PORT &= ~(1 << LCD_RS); // RS=0
LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0 LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
@ -164,7 +164,7 @@ void writeLCDInstr(uint8_t instr) {
the LCD. In the default 8-bit mode and EIGHT_BIT_ARBITRARY_PIN_MODE, the given data is the LCD. In the default 8-bit mode and EIGHT_BIT_ARBITRARY_PIN_MODE, the given data is
written in one cycle using the writeLCDByte_ function. In FOUR_BIT_MODE however, the given written in one cycle using the writeLCDByte_ function. In FOUR_BIT_MODE however, the given
data is written in two cycles using two successive calls to the writeLCDNibble_ function. data is written in two cycles using two successive calls to the writeLCDNibble_ function.
*/ */
void writeCharToLCD_(char c) { void writeCharToLCD_(char c) {
LCD_RS_PORT |= (1 << LCD_RS); // RS=1 LCD_RS_PORT |= (1 << LCD_RS); // RS=1
LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0 LCD_RW_PORT &= ~(1 << LCD_RW); // RW=0
@ -192,7 +192,7 @@ void writeCharToLCD_(char c) {
- Alarm '\a': ignored - Alarm '\a': ignored
Any other character is sent to the LCD display using writeCharToLCD_. Any other character is sent to the LCD display using writeCharToLCD_.
*/ */
void writeCharToLCD(char c) { void writeCharToLCD(char c) {
switch (c) { switch (c) {
case '\n': // Line feed case '\n': // Line feed
@ -259,7 +259,7 @@ void writeStringToLCD(const char* str) {
/* /*
Writes the CMD_CLEAR_DISPLAY command to the LCD using writeLCDINSTR, and clears the local Writes the CMD_CLEAR_DISPLAY command to the LCD using writeLCDINSTR, and clears the local
char and line counters. char and line counters.
*/ */
void clearDisplay(void) { void clearDisplay(void) {
writeLCDInstr(CMD_CLEAR_DISPLAY); writeLCDInstr(CMD_CLEAR_DISPLAY);
@ -271,7 +271,7 @@ void clearDisplay(void) {
/* /*
Writes the CMD_RETURN_HOME command to the LCD using writeLCDInstr, and clears the local char Writes the CMD_RETURN_HOME command to the LCD using writeLCDInstr, and clears the local char
and line counters. and line counters.
*/ */
void returnHome(void) { void returnHome(void) {
writeLCDInstr(CMD_RETURN_HOME); writeLCDInstr(CMD_RETURN_HOME);
@ -292,6 +292,8 @@ void returnHome(void) {
/* return c; */ /* return c; */
/* } */ /* } */
//-----------------------------------------------------------------------------------------------
/* /*
Set all pins of LCD_DBUS, as well as pins LCD_RS, and LCD_RW as outputs Set all pins of LCD_DBUS, as well as pins LCD_RS, and LCD_RW as outputs
*/ */