42 lines
1.1 KiB
C
42 lines
1.1 KiB
C
#include STM32_HAL_H
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I2C_HandleTypeDef i2c_handle;
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void __fatal_error(const char *msg);
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void i2c_init(void) {
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// Enable I2C clock
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__HAL_RCC_I2C1_CLK_ENABLE();
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// Init SCL and SDA GPIO lines (PB6 & PB7)
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GPIO_InitTypeDef GPIO_InitStructure = {
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.Pin = GPIO_PIN_6 | GPIO_PIN_7,
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.Mode = GPIO_MODE_AF_OD,
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.Pull = GPIO_NOPULL,
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.Speed = GPIO_SPEED_FREQ_VERY_HIGH,
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.Alternate = GPIO_AF4_I2C1,
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};
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HAL_GPIO_Init(GPIOB, &GPIO_InitStructure);
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I2C_InitTypeDef *init = &(i2c_handle.Init);
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init->OwnAddress1 = 0xFE; // master
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init->ClockSpeed = 400000;
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init->DutyCycle = I2C_DUTYCYCLE_16_9;
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init->AddressingMode = I2C_ADDRESSINGMODE_7BIT;
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init->DualAddressMode = I2C_DUALADDRESS_DISABLED;
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init->GeneralCallMode = I2C_GENERALCALL_DISABLED;
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init->NoStretchMode = I2C_NOSTRETCH_DISABLED;
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init->OwnAddress2 = 0;
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// Init I2C handle
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if (HAL_I2C_Init(&i2c_handle) != HAL_OK) {
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__fatal_error("i2c_init failed");
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return;
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}
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// Enable IRQs
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HAL_NVIC_EnableIRQ(I2C1_EV_IRQn);
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HAL_NVIC_EnableIRQ(I2C1_ER_IRQn);
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}
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