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OneOfEleven
2023-09-09 08:03:56 +01:00
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driver/i2c.c Normal file
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/* Copyright 2023 Dual Tachyon
* https://github.com/DualTachyon
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "bsp/dp32g030/gpio.h"
#include "bsp/dp32g030/portcon.h"
#include "driver/gpio.h"
#include "driver/i2c.h"
#include "driver/systick.h"
void I2C_Start(void)
{
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
SYSTICK_DelayUs(1);
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
}
void I2C_Stop(void)
{
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
SYSTICK_DelayUs(1);
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
SYSTICK_DelayUs(1);
}
uint8_t I2C_Read(bool bFinal)
{
uint8_t i, Data;
PORTCON_PORTA_IE |= PORTCON_PORTA_IE_A11_BITS_ENABLE;
PORTCON_PORTA_OD &= ~PORTCON_PORTA_OD_A11_MASK;
GPIOA->DIR &= ~GPIO_DIR_11_MASK;
Data = 0;
for (i = 0; i < 8; i++) {
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
Data <<= 1;
SYSTICK_DelayUs(1);
if (GPIO_CheckBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA)) {
Data |= 1U;
}
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
}
PORTCON_PORTA_IE &= ~PORTCON_PORTA_IE_A11_MASK;
PORTCON_PORTA_OD |= PORTCON_PORTA_OD_A11_BITS_ENABLE;
GPIOA->DIR |= GPIO_DIR_11_BITS_OUTPUT;
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
if (bFinal) {
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
} else {
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
}
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
return Data;
}
int I2C_Write(uint8_t Data)
{
uint8_t i;
int ret = -1;
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
for (i = 0; i < 8; i++) {
if ((Data & 0x80) == 0) {
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
} else {
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
}
Data <<= 1;
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
}
PORTCON_PORTA_IE |= PORTCON_PORTA_IE_A11_BITS_ENABLE;
PORTCON_PORTA_OD &= ~PORTCON_PORTA_OD_A11_MASK;
GPIOA->DIR &= ~GPIO_DIR_11_MASK;
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
SYSTICK_DelayUs(1);
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
for (i = 0; i < 255; i++) {
if (GPIO_CheckBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA) == 0) {
ret = 0;
break;
}
}
GPIO_ClearBit(&GPIOA->DATA, GPIOA_PIN_I2C_SCL);
SYSTICK_DelayUs(1);
PORTCON_PORTA_IE &= ~PORTCON_PORTA_IE_A11_MASK;
PORTCON_PORTA_OD |= PORTCON_PORTA_OD_A11_BITS_ENABLE;
GPIOA->DIR |= GPIO_DIR_11_BITS_OUTPUT;
GPIO_SetBit(&GPIOA->DATA, GPIOA_PIN_I2C_SDA);
return ret;
}
int I2C_ReadBuffer(void *pBuffer, uint8_t Size)
{
uint8_t *pData = (uint8_t *)pBuffer;
uint8_t i;
if (Size == 1) {
*pData = I2C_Read(true);
return 1;
}
for (i = 0; i < Size - 1; i++) {
SYSTICK_DelayUs(1);
pData[i] = I2C_Read(false);
}
SYSTICK_DelayUs(1);
pData[i++] = I2C_Read(true);
return Size;
}
int I2C_WriteBuffer(const void *pBuffer, uint8_t Size)
{
const uint8_t *pData = (const uint8_t *)pBuffer;
uint8_t i;
for (i = 0; i < Size; i++) {
if (I2C_Write(*pData++) < 0) {
return -1;
}
}
return 0;
}