Basic I2C functionality

2024-12-29 16:24:54 +01:00
parent 17099b0047
commit 1e648be211
9 changed files with 416 additions and 208 deletions
--- a/Core/Src/i2c.cpp
+++ b/Core/Src/i2c.cpp
@@ -0,0 +1,77 @@
+#include "i2c.hpp"
+
+#include "pindef.hpp"
+#include "stm32f4xx_hal_i2c.h"
+
+namespace driver::i2c {
+I2c::I2c(I2C_TypeDef* i2c, const uint32_t clockSpeed, const uint32_t dutyCycle,
+         const uint32_t ownAddress1, const uint32_t addressingMode, const uint32_t dualAddressMode,
+         const uint32_t ownAddress2, const uint32_t generalCallMode, const uint32_t noStretchMode)
+    : mHandle{.Instance = i2c,
+              .Init{.ClockSpeed      = clockSpeed,
+                    .DutyCycle       = dutyCycle,
+                    .OwnAddress1     = ownAddress1,
+                    .AddressingMode  = addressingMode,
+                    .DualAddressMode = dualAddressMode,
+                    .OwnAddress2     = ownAddress2,
+                    .GeneralCallMode = generalCallMode,
+                    .NoStretchMode   = noStretchMode},
+              .pBuffPtr      = nullptr,
+              .XferSize      = 0,
+              .XferCount     = 0,
+              .XferOptions   = 0,
+              .PreviousState = 0,
+              .hdmatx        = nullptr,
+              .hdmarx        = nullptr,
+              .Lock          = HAL_UNLOCKED,
+              .State         = HAL_I2C_STATE_RESET,
+              .Mode          = HAL_I2C_MODE_NONE,
+              .ErrorCode     = HAL_I2C_ERROR_NONE,
+              .Devaddress    = 0,
+              .Memaddress    = 0,
+              .MemaddSize    = 0,
+              .EventCount    = 0} {}
+
+bool I2c::init() {
+    GPIO_InitTypeDef GPIO_InitStruct = {0};
+    if (mHandle.Instance == I2C1) {
+        __HAL_RCC_GPIOB_CLK_ENABLE();
+        /**I2C1 GPIO Configuration
+        PB6     ------> I2C1_SCL
+        PB7     ------> I2C1_SDA
+        */
+        GPIO_InitStruct.Pin       = GPIO_PIN_6 | GPIO_PIN_7;
+        GPIO_InitStruct.Mode      = GPIO_MODE_AF_OD;
+        GPIO_InitStruct.Pull      = GPIO_PULLUP;
+        GPIO_InitStruct.Speed     = GPIO_SPEED_FREQ_VERY_HIGH;
+        GPIO_InitStruct.Alternate = GPIO_AF4_I2C1;
+        HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+
+        __HAL_RCC_I2C1_CLK_ENABLE();
+    }
+    return HAL_I2C_Init(&mHandle) == HAL_OK;
+}
+
+void I2c::deinit() {}
+
+HAL_StatusTypeDef I2c::write(const uint16_t slaveAddr, const uint16_t memAddr,
+                             std::vector<uint8_t>& data) {
+    // Slave address needs to be shifted to the left, so that the r/w bit can be set by the HAL method
+    // Addressing mode for slaves is fixed to 8bit for now...
+    return HAL_I2C_Mem_Write(&mHandle, slaveAddr << 1, memAddr, I2C_MEMADD_SIZE_8BIT, data.data(),
+                             data.size(), I2C_TIMEOUT_MS);
+}
+
+std::pair<HAL_StatusTypeDef, uint8_t> I2c::read(const uint16_t slaveAddr, const uint16_t memAddr) {
+    uint8_t data;
+    // Slave address needs to be shifted to the left, so that the r/w bit can be set by the HAL method
+    auto state = HAL_I2C_Mem_Read(&mHandle, slaveAddr << 1, memAddr, I2C_MEMADD_SIZE_8BIT, &data, 1,
+                                  I2C_TIMEOUT_MS);
+    return {state, data};
+}
+
+uint32_t I2c::getLastError() {
+    return mHandle.ErrorCode;
+}
+
+}  // namespace driver::i2c