hoverboard-firmware-hack-fo.../Src/hd44780.c

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2019-11-26 22:58:20 +00:00
/*
* * hd44780.c
*
* Created on: Feb 20, 2014
* Author: Peter
*/
#include "hd44780.h"
uint32_t PCF8574_Type0Pins[8] = { 4, 5, 6, 7, 0, 1, 2, 3 };
uint8_t LCDerrorFlag = 0;
void LCD_WaitForBusyFlag(LCD_PCF8574_HandleTypeDef* handle) {
uint8_t flag;
LCD_GetBusyFlag(handle, &flag);
//uint32_t startTick=HAL_GetTick();
//while (flag == 1 && HAL_GetTick()-startTick<handle->pcf8574.PCF_I2C_TIMEOUT) {
// LCD_GetBusyFlag(handle, &flag);
//}
return;
}
LCD_RESULT LCD_I2C_WriteOut(LCD_PCF8574_HandleTypeDef* handle) {
if (!LCDerrorFlag) {
if (PCF8574_Write(&handle->pcf8574, handle->state) != PCF8574_OK) {
//handle->errorCallback(LCD_ERROR);
LCDerrorFlag = 1;
return LCD_ERROR;
}
return LCD_OK;
}
return LCD_ERROR;
}
LCD_RESULT LCD_StateLEDControl(LCD_PCF8574_HandleTypeDef* handle, uint8_t on) {
return LCD_StateWriteBit(handle, on & 1, LCD_PIN_LED);
}
LCD_RESULT LCD_StateWriteBit(LCD_PCF8574_HandleTypeDef* handle, uint8_t value,
LCD_PIN pin) {
if (value) {
handle->state |= 1 << handle->pins[pin];
} else {
handle->state &= ~(1 << handle->pins[pin]);
}
return LCD_I2C_WriteOut(handle);
}
LCD_RESULT LCD_Init(LCD_PCF8574_HandleTypeDef* handle) {
handle->D = 1;
handle->B = 0;
handle->C = 0;
if (handle->type == TYPE0) {
handle->pins = PCF8574_Type0Pins;
} else {
//handle->errorCallback(LCD_ERROR);
return LCD_ERROR; // no type of subinterface was specified
}
if (PCF8574_Init(&handle->pcf8574) != PCF8574_OK) {
//handle->errorCallback(LCD_ERROR);
return LCD_ERROR;
}
//HAL_Delay(50);
LCD_StateWriteBit(handle, 0, LCD_PIN_RS);
LCD_StateWriteBit(handle, 0, LCD_PIN_RW);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_WriteToDataBus(handle, 3);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
HAL_Delay(1);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
HAL_Delay(5);
LCD_WriteToDataBus(handle, 3);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
HAL_Delay(1);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
HAL_Delay(1);
LCD_WriteToDataBus(handle, 3);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
HAL_Delay(1);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
HAL_Delay(1);
LCD_WriteToDataBus(handle, 2);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
HAL_Delay(1);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
HAL_Delay(1);
uint8_t cmd = 0;
cmd = cmd | (handle->NUMBER_OF_LINES << 3);
cmd = cmd | (1 << 5);
LCD_WriteCMD(handle, cmd); // setting interface
cmd = 0;
cmd = cmd | (1 << 3);
cmd = cmd | (handle->C << 1);
cmd = cmd | handle->B;
LCD_WriteCMD(handle, cmd); // setting display/cursor
LCD_ClearDisplay(handle);
LCD_EntryModeSet(handle, DIRECTION_INCREMENT, SHIFT_NO);
LCD_DisplayON(handle);
LCD_StateLEDControl(handle, 1); // LED power on
return LCD_OK;
}
LCD_RESULT LCD_WriteToDataBus(LCD_PCF8574_HandleTypeDef* handle, uint8_t data) {
if ((data & 1) == 1) {
handle->state |= 1 << handle->pins[LCD_PIN_D4];
} else {
handle->state &= ~(1 << handle->pins[LCD_PIN_D4]);
}
if ((data & 2) == 2) {
handle->state |= 1 << handle->pins[LCD_PIN_D5];
} else {
handle->state &= ~(1 << handle->pins[LCD_PIN_D5]);
}
if ((data & 4) == 4) {
handle->state |= 1 << handle->pins[LCD_PIN_D6];
} else {
handle->state &= ~(1 << handle->pins[LCD_PIN_D6]);
}
if ((data & 8) == 8) {
handle->state |= 1 << handle->pins[LCD_PIN_D7];
} else {
handle->state &= ~(1 << handle->pins[LCD_PIN_D7]);
}
return LCD_I2C_WriteOut(handle);
}
LCD_RESULT LCD_GetBusyFlag(LCD_PCF8574_HandleTypeDef* handle, uint8_t* flag) {
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_RS);
LCD_StateWriteBit(handle, 1, LCD_PIN_RW);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
//PCF8574_Read(&handle->pcf8574, flag);
//*flag &= 1 << handle->pins[LCD_PIN_D7];
//*flag >>= handle->pins[LCD_PIN_D7];
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
//uint8_t flag2;
//PCF8574_Read(&handle->pcf8574, &flag2);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_RW);
return LCD_OK;
}
LCD_RESULT LCD_WriteCMD(LCD_PCF8574_HandleTypeDef* handle, uint8_t cmd) {
if (!LCDerrorFlag) {
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_RS);
LCD_WriteToDataBus(handle, cmd >> 4);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_WriteToDataBus(handle, cmd);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_WaitForBusyFlag(handle);
return LCD_OK;
} return LCD_ERROR;
}
LCD_RESULT LCD_WriteDATA(LCD_PCF8574_HandleTypeDef* handle, uint8_t data) {
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_StateWriteBit(handle, 1, LCD_PIN_RS);
LCD_WriteToDataBus(handle, data >> 4);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_WriteToDataBus(handle, data);
LCD_StateWriteBit(handle, 1, LCD_PIN_E);
LCD_StateWriteBit(handle, 0, LCD_PIN_E);
LCD_WaitForBusyFlag(handle);
return LCD_OK;
}
LCD_RESULT LCD_SetLocation(LCD_PCF8574_HandleTypeDef* handle, uint8_t x,
uint8_t y) {
uint8_t add = 0x40 * y + x;
uint8_t cmd = 1 << 7;
cmd = cmd | add;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_WriteString(LCD_PCF8574_HandleTypeDef* handle, char *s) {
int i = 0;
if (s != 0) {
while (i < 80 && s[i] != 0) {
LCD_WaitForBusyFlag(handle);
LCD_WriteDATA(handle, s[i]);
i++;
}
}
return LCD_OK;
}
LCD_RESULT LCD_ClearDisplay(LCD_PCF8574_HandleTypeDef* handle) {
return LCD_WriteCMD(handle, 1);
}
LCD_RESULT LCD_DisplayON(LCD_PCF8574_HandleTypeDef* handle) {
handle->D = 1;
uint8_t cmd = 0;
cmd = cmd | (1 << 3);
cmd = cmd | (handle->D << 2);
cmd = cmd | (handle->C << 1);
cmd = cmd | handle->B;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_DisplayOFF(LCD_PCF8574_HandleTypeDef* handle) {
handle->D = 0;
uint8_t cmd = 0;
cmd = cmd | (1 << 3);
cmd = cmd | (handle->D << 2);
cmd = cmd | (handle->C << 1);
cmd = cmd | handle->B;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_CursorON(LCD_PCF8574_HandleTypeDef* handle, uint8_t blink) {
handle->C = 1;
blink &= 1;
handle->B = blink;
uint8_t cmd = 0;
cmd = cmd | (1 << 3);
cmd = cmd | (handle->D << 2);
cmd = cmd | (handle->C << 1);
cmd = cmd | handle->B;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_CursorOFF(LCD_PCF8574_HandleTypeDef* handle) {
handle->C = 0;
uint8_t cmd = 0;
cmd = cmd | (1 << 3);
cmd = cmd | (handle->D << 2);
cmd = cmd | (handle->C << 1);
cmd = cmd | handle->B;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_ShiftCursor(LCD_PCF8574_HandleTypeDef* handle, uint8_t direction,
uint8_t steps) {
direction &= 1;
uint8_t cmd = 0;
cmd |= 1 << 4;
cmd |= direction << 2;
int i = 0;
for (i = 0; i < steps; i++) {
if (LCD_WriteCMD(handle, cmd) != LCD_OK) {
//handle->errorCallback(LCD_ERROR);
return LCD_ERROR;
}
}
return LCD_OK;
}
LCD_RESULT LCD_ShiftDisplay(LCD_PCF8574_HandleTypeDef* handle,
uint8_t direction, uint8_t steps) {
direction &= 1;
uint8_t cmd = 0;
cmd |= 1 << 4;
cmd |= 1 << 3;
cmd |= direction << 2;
int i = 0;
for (i = 0; i < steps; i++) {
if (LCD_WriteCMD(handle, cmd) != LCD_OK) {
//handle->errorCallback(LCD_ERROR);
return LCD_ERROR;
}
}
return LCD_OK;
}
LCD_RESULT LCD_WriteNumber(LCD_PCF8574_HandleTypeDef* handle, unsigned long n,
uint8_t base) {
char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
char *str = &buf[sizeof(buf) - 1];
*str = '\0';
// prevent crash if called with base == 1
if (base < 2)
base = 10;
do {
unsigned long m = n;
n /= base;
char c = m - base * n;
*--str = c < 10 ? c + '0' : c + 'A' - 10;
} while (n);
return LCD_WriteString(handle, str);
}
LCD_RESULT LCD_WriteFloat(LCD_PCF8574_HandleTypeDef* handle, double number,
uint8_t digits) {
// Handle negative numbers
if (number < 0.0) {
LCD_WriteString(handle,"-");
number = -number;
}
// Round correctly so that print(1.999, 2) prints as "2.00"
double rounding = 0.5;
for (uint8_t i = 0; i < digits; ++i)
rounding /= 10.0;
number += rounding;
// Extract the integer part of the number and print it
unsigned long int_part = (unsigned long) number;
double remainder = number - (double) int_part;
LCD_WriteNumber(handle,int_part,10);
// Print the decimal point, but only if there are digits beyond
if (digits > 0) {
LCD_WriteString(handle,".");
}
// Extract digits from the remainder one at a time
while (digits-- > 0) {
remainder *= 10.0;
int toPrint = (int)(remainder);
LCD_WriteNumber(handle,toPrint,10);
remainder -= toPrint;
}
return LCD_OK;
}
LCD_RESULT LCD_EntryModeSet(LCD_PCF8574_HandleTypeDef* handle,
LCD_DIRECTION_INC_DEC direction, LCD_SHIFT shift) {
uint8_t cmd = 0;
cmd |= 1 << 2;
cmd |= direction << 1;
cmd |= shift;
return LCD_WriteCMD(handle, cmd);
}
LCD_RESULT LCD_CustomChar(LCD_PCF8574_HandleTypeDef* handle, uint8_t *pattern,
uint8_t address) {
uint8_t a = 0;
int i = 0;
a = 8 * address;
LCD_WriteCMD(handle, a | 0x40);
for (i = 0; i < 8; i++) {
LCD_WriteDATA(handle, pattern[i]);
}
return LCD_OK;
}