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44 lines
1.7 KiB
C
44 lines
1.7 KiB
C
// Copyright (c) 2023 Cesanta Software Limited
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// All rights reserved
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// https://www.st.com/resource/en/reference_manual/dm00124865-stm32f75xxx-and-stm32f74xxx-advanced-arm-based-32-bit-mcus-stmicroelectronics.pdf
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#pragma once
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#include <stm32f746xx.h>
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#define UUID ((uint8_t *) UID_BASE) // Unique 96-bit chip ID. TRM 41.1
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// Helper macro for MAC generation
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#define GENERATE_LOCALLY_ADMINISTERED_MAC() \
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{ \
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2, UUID[0] ^ UUID[1], UUID[2] ^ UUID[3], UUID[4] ^ UUID[5], \
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UUID[6] ^ UUID[7] ^ UUID[8], UUID[9] ^ UUID[10] ^ UUID[11] \
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}
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// For internal testing purposes
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#ifdef UART_DEBUG
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#include "main.h"
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#define BIT(x) (1UL << (x))
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static inline void test_init(void) {
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USART_TypeDef *uart = USART1; // hardcode to USART1 PA9,10
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uint32_t freq = SystemCoreClock / BIT(((RCC->CFGR >> 13) & 0x7) - 3);
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__HAL_RCC_USART1_CLK_ENABLE();
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__HAL_RCC_GPIOA_CLK_ENABLE();
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GPIO_InitTypeDef GPIO_InitStruct = {.Pin = GPIO_PIN_10 | GPIO_PIN_9,
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.Mode = GPIO_MODE_AF_PP,
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.Pull = GPIO_NOPULL,
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.Speed = GPIO_SPEED_FREQ_VERY_HIGH,
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.Alternate = GPIO_AF7_USART1};
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HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
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uart->CR1 = 0; // Disable this UART
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uart->BRR = freq / 115200; // Set baud rate
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uart->CR1 |= BIT(0) | BIT(2) | BIT(3); // Set UE, RE, TE
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}
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static inline void uart_write_byte(USART_TypeDef *uart, uint8_t byte) {
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uart->TDR = byte;
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while ((uart->ISR & BIT(7)) == 0) (void) 0;
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}
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#else
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#define test_init()
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#endif
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