154c7c691b
This commit changes the number of wait states for the stm32f103 chip to 2 instead of 4. This gets it back in line with the datasheet, but it also has the side effect of breaking I2C. Therefore, another (seemingly unrelated) change is needed: the i2cTimeout constant must be increased to a higher value to adjust to the lower flash wait states - presumably because the lower number of wait states allows the chip to run code faster.
44 строки
1,1 КиБ
Go
44 строки
1,1 КиБ
Go
// +build stm32f7x2
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package machine
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// Peripheral abstraction layer for the stm32f407
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import (
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"device/stm32"
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"runtime/interrupt"
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)
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func CPUFrequency() uint32 {
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return 216000000
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}
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//---------- UART related types and code
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// UART representation
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type UART struct {
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Buffer *RingBuffer
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Bus *stm32.USART_Type
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Interrupt interrupt.Interrupt
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AltFuncSelector uint8
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}
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// Configure the UART.
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func (uart UART) configurePins(config UARTConfig) {
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// enable the alternate functions on the TX and RX pins
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config.TX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTTX}, uart.AltFuncSelector)
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config.RX.ConfigureAltFunc(PinConfig{Mode: PinModeUARTRX}, uart.AltFuncSelector)
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}
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// UART baudrate calc based on the bus and clockspeed
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// NOTE: keep this in sync with the runtime/runtime_stm32f7x2.go clock init code
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func (uart UART) getBaudRateDivisor(baudRate uint32) uint32 {
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var clock uint32
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switch uart.Bus {
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case stm32.USART1, stm32.USART6:
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clock = CPUFrequency() / 2 // APB2 Frequency
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case stm32.USART2, stm32.USART3, stm32.UART4, stm32.UART5:
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clock = CPUFrequency() / 8 // APB1 Frequency
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}
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return clock / baudRate
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}
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