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