116 lines
4.0 KiB
C++
116 lines
4.0 KiB
C++
//
|
|
// Created by Luca on 9/9/2025.
|
|
//
|
|
|
|
#include "SHAL_I2C.h"
|
|
#include "SHAL_GPIO.h"
|
|
|
|
void SHAL_I2C::init(I2C_Pair pair) volatile {
|
|
m_I2CPair = pair;
|
|
|
|
SHAL_I2C_Pair I2CPair = getI2CPair(pair); //Get the UART_PAIR information to be initialized
|
|
|
|
//Get the SHAL_GPIO pins for this SHAL_I2C setup
|
|
GPIO_Key SCL_Key = I2CPair.SCL_Key; //SCL pin
|
|
GPIO_Key SDA_Key = I2CPair.SDA_Key; //SDA pin
|
|
|
|
GET_GPIO(SCL_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE); //Implicitly initializes and enables GPIO bus
|
|
GET_GPIO(SDA_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE);
|
|
|
|
GET_GPIO(SCL_Key).setAlternateFunction(I2CPair.SCL_Mask);
|
|
GET_GPIO(SDA_Key).setAlternateFunction(I2CPair.SDA_Mask);
|
|
|
|
//These may be abstracted further to support multiple I2C configurations
|
|
GET_GPIO(SCL_Key).setPinType(PinType::OPEN_DRAIN);
|
|
GET_GPIO(SDA_Key).setPinType(PinType::OPEN_DRAIN);
|
|
|
|
GET_GPIO(SCL_Key).setOutputSpeed(OutputSpeed::HIGH_SPEED);
|
|
GET_GPIO(SDA_Key).setOutputSpeed(OutputSpeed::HIGH_SPEED);
|
|
|
|
GET_GPIO(SCL_Key).setInternalResistor(InternalResistorType::PULLUP);
|
|
GET_GPIO(SDA_Key).setInternalResistor(InternalResistorType::PULLUP);
|
|
|
|
SHAL_I2C_Enable_Reg pairI2CEnable = getI2CEnableReg(pair); //Register and mask to enable the I2C peripheral
|
|
SHAL_I2C_Reset_Reg pairI2CReset = getI2CResetReg(pair);
|
|
|
|
*pairI2CReset.reg |= pairI2CReset.mask; //Reset peripheral
|
|
*pairI2CEnable.reg |= pairI2CEnable.mask; //Enable I2C peripheral clock
|
|
|
|
I2CPair.I2CReg->CR1 |= I2C_CR1_PE; //Enable I2C peripheral
|
|
}
|
|
|
|
void SHAL_I2C::setClockConfig(uint8_t prescaler, uint8_t dataSetupTime, uint8_t dataHoldTime, uint8_t SCLHighPeriod, uint8_t SCLLowPeriod) {
|
|
|
|
SHAL_I2C_Timing_Reg clockReg = getI2CTimerReg(m_I2CPair);
|
|
|
|
*clockReg.reg |= (prescaler << clockReg.prescaler_offset);
|
|
*clockReg.reg |= (dataSetupTime << clockReg.dataSetupTime_offset);
|
|
*clockReg.reg |= (dataHoldTime << clockReg.dataHoldTime_offset);
|
|
*clockReg.reg |= (SCLHighPeriod << clockReg.SCLHighPeriod_offset);
|
|
*clockReg.reg |= (SCLLowPeriod << clockReg.SCLLowPeriod_offset);
|
|
}
|
|
|
|
void SHAL_I2C::setClockConfig(uint32_t configuration) {
|
|
*getI2CTimerReg(m_I2CPair).reg = configuration;
|
|
}
|
|
|
|
void SHAL_I2C::masterWriteRead(uint8_t addr,const uint8_t* writeData, size_t writeLen, uint8_t* readData, size_t readLen) {
|
|
volatile I2C_TypeDef* I2CPeripheral = getI2CPair(m_I2CPair).I2CReg;
|
|
|
|
//Wait for I2C bus
|
|
while (I2CPeripheral->ISR & I2C_ISR_BUSY);
|
|
|
|
//Write phase
|
|
if (writeLen > 0) {
|
|
//Configure: NBYTES = wlen, write mode, START
|
|
I2CPeripheral->CR2 = (addr << 1) |
|
|
(writeLen << I2C_CR2_NBYTES_Pos) |
|
|
I2C_CR2_START;
|
|
|
|
for (size_t i = 0; i < writeLen; i++) {
|
|
while (!(I2CPeripheral->ISR & I2C_ISR_TXIS)); // TX ready
|
|
I2CPeripheral->TXDR = writeData[i];
|
|
}
|
|
|
|
//Wait until transfer complete
|
|
while (!(I2CPeripheral->ISR & I2C_ISR_TC));
|
|
}
|
|
|
|
//Read phase
|
|
if (readLen > 0) {
|
|
I2CPeripheral->CR2 = (addr << 1) |
|
|
I2C_CR2_RD_WRN |
|
|
(readLen << I2C_CR2_NBYTES_Pos) |
|
|
I2C_CR2_START | I2C_CR2_AUTOEND;
|
|
|
|
for (size_t i = 0; i < readLen; i++) {
|
|
while (!(I2CPeripheral->ISR & I2C_ISR_RXNE)); //RX ready
|
|
readData[i] = static_cast<uint8_t>(I2CPeripheral->RXDR);
|
|
}
|
|
}
|
|
}
|
|
|
|
void SHAL_I2C::masterWrite(uint8_t addr, const uint8_t *writeData, uint8_t writeLen) {
|
|
masterWriteRead(addr,writeData,writeLen,nullptr,0);
|
|
}
|
|
|
|
void SHAL_I2C::masterRead(uint8_t addr, uint8_t *readBuffer, uint8_t bytesToRead) {
|
|
masterWriteRead(addr,nullptr,0,readBuffer,bytesToRead);
|
|
}
|
|
|
|
uint8_t SHAL_I2C::masterWriteReadByte(uint8_t addr, const uint8_t *writeData, size_t writeLen) {
|
|
uint8_t val = 0;
|
|
masterWriteRead(addr, writeData, writeLen, &val, 1);
|
|
return val;
|
|
}
|
|
|
|
SHAL_I2C& I2CManager::get(uint8_t I2CBus) {
|
|
|
|
if(I2CBus > NUM_I2C_BUSES - 1){
|
|
assert(false);
|
|
//Memory fault
|
|
}
|
|
|
|
return m_I2CBuses[I2CBus];
|
|
}
|