121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
//
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// Created by Luca on 9/9/2025.
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//
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#include "SHAL_I2C.h"
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#include "SHAL_GPIO.h"
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void SHAL_I2C::init(I2C_Pair pair) volatile {
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m_I2CPair = pair;
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SHAL_I2C_Pair I2CPair = getI2CPair(pair); //Get the UART_PAIR information to be initialized
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//Get the SHAL_GPIO pins for this SHAL_I2C setup
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GPIO_Key SCL_Key = I2CPair.SCL_Key; //SCL pin
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GPIO_Key SDA_Key = I2CPair.SDA_Key; //SDA pin
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GET_GPIO(SCL_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE); //Implicitly initializes and enables GPIO bus
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GET_GPIO(SDA_Key).setPinMode(PinMode::ALTERNATE_FUNCTION_MODE);
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GET_GPIO(SCL_Key).setAlternateFunction(I2CPair.SCL_Mask);
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GET_GPIO(SDA_Key).setAlternateFunction(I2CPair.SDA_Mask);
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//These may be abstracted further to support multiple I2C configurations
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GET_GPIO(SCL_Key).setPinType(PinType::OPEN_DRAIN);
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GET_GPIO(SDA_Key).setPinType(PinType::OPEN_DRAIN);
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GET_GPIO(SCL_Key).setOutputSpeed(OutputSpeed::HIGH_SPEED);
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GET_GPIO(SDA_Key).setOutputSpeed(OutputSpeed::HIGH_SPEED);
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GET_GPIO(SCL_Key).setInternalResistor(InternalResistorType::PULLUP);
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GET_GPIO(SDA_Key).setInternalResistor(InternalResistorType::PULLUP);
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SHAL_I2C_Enable_Reg pairI2CEnable = getI2CEnableReg(pair); //Register and mask to enable the I2C peripheral
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SHAL_I2C_Reset_Reg pairI2CReset = getI2CResetReg(pair);
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*pairI2CReset.reg |= pairI2CReset.mask; //Reset peripheral
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*pairI2CEnable.reg |= pairI2CEnable.mask; //Enable I2C peripheral clock
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I2CPair.I2CReg->CR1 |= I2C_CR1_PE; //Enable I2C peripheral
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}
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void SHAL_I2C::setClockConfig(uint8_t prescaler, uint8_t dataSetupTime, uint8_t dataHoldTime, uint8_t SCLHighPeriod, uint8_t SCLLowPeriod) {
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SHAL_I2C_Timing_Reg clockReg = getI2CTimerReg(m_I2CPair);
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*clockReg.reg |= (prescaler << clockReg.prescaler_offset);
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*clockReg.reg |= (dataSetupTime << clockReg.dataSetupTime_offset);
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*clockReg.reg |= (dataHoldTime << clockReg.dataHoldTime_offset);
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*clockReg.reg |= (SCLHighPeriod << clockReg.SCLHighPeriod_offset);
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*clockReg.reg |= (SCLLowPeriod << clockReg.SCLLowPeriod_offset);
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}
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void SHAL_I2C::setClockConfig(uint32_t configuration) {
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*getI2CTimerReg(m_I2CPair).reg = configuration;
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}
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void SHAL_I2C::masterTransmit(uint8_t addr, uint8_t reg, uint8_t data) {
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volatile I2C_TypeDef* I2CPeripheral = getI2CPair(m_I2CPair).I2CReg;
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//Wait until not busy
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while (I2CPeripheral->ISR & I2C_ISR_BUSY);
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//Send start + slave address
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I2CPeripheral->CR2 = (addr << 1) | (2 << I2C_CR2_NBYTES_Pos) | I2C_CR2_START | I2C_CR2_AUTOEND; //Pack bits in compliance with I2C format
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//Wait until TX ready
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while (!(I2CPeripheral->ISR & I2C_ISR_TXIS));
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//Send register address
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I2CPeripheral->TXDR = reg;
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//Wait until TX ready
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while (!(I2CPeripheral->ISR & I2C_ISR_TXIS));
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//Send data to write to register
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I2CPeripheral->TXDR = data;
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}
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uint8_t SHAL_I2C::masterReceive(uint8_t addr, uint8_t reg) {
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volatile I2C_TypeDef* I2CPeripheral = getI2CPair(m_I2CPair).I2CReg;
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//Send register address with write
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//Wait for bus
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while (I2CPeripheral->ISR & I2C_ISR_BUSY);
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//Send start with I2C config
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I2CPeripheral->CR2 = (addr << 1) | (1 << I2C_CR2_NBYTES_Pos) | I2C_CR2_START;
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//Wait for transmit
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while (!(I2CPeripheral->ISR & I2C_ISR_TXIS));
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//Set address to read from
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I2CPeripheral->TXDR = reg;
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//Wait for transfer to complete
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while (!(I2CPeripheral->ISR & I2C_ISR_TC));
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//Restart in read mode, auto end
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I2CPeripheral->CR2 = (addr << 1) | I2C_CR2_RD_WRN |
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(1 << I2C_CR2_NBYTES_Pos) |
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I2C_CR2_START | I2C_CR2_AUTOEND;
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//Wait
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while (!(I2C1->ISR & I2C_ISR_RXNE));
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return (uint8_t)I2C1->RXDR;
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}
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SHAL_I2C& I2CManager::get(uint8_t I2CBus) {
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if(I2CBus > NUM_I2C_BUSES - 1){
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assert(false);
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//Memory fault
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}
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return m_I2CBuses[I2CBus];
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}
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