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deadprogram
7d51044892
This fixes several issues in the STM32 UART implementation: - `writeByte` now waits for the transmit register to be empty before writing, preventing data loss by avoiding overwriting the shift register. - `flush` now correctly waits for the Transmission Complete (TC) flag. - The interrupt handler now clears all error flags (ORE, NE, FE, PE) to prevent interrupt storms, rather than just ORE. - Extracted `SetBaudRate` so it can be cleanly overridden by specific MCU families. It also introduces specific fixes for the STM32U5 family: - Enforces a minimum BRR divisor of 16 in `getBaudRateDivisor` to prevent undefined hardware behavior and CPU starvation. - Overrides `SetBaudRate` for STM32U585 to momentarily disable the USART (UE=0) before updating the BRR register, which is read-only when enabled. - Adds a readback after enabling the USART1 clock to ensure the clock is active before register access. Signed-off-by: deadprogram <ron@hybridgroup.com>
14 lines
418 B
Go
14 lines
418 B
Go
//go:build stm32 && !stm32u585
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package machine
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// SetBaudRate sets the communication speed for the UART. Defers to
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// chip-specific getBaudRateDivisor for the divisor calculation.
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//
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// On STM32U585 this function is overridden in machine_stm32u585.go because
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// the U5 family requires UE=0 to write BRR.
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func (uart *UART) SetBaudRate(br uint32) {
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divider := uart.getBaudRateDivisor(br)
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uart.Bus.BRR.Set(divider)
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}
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