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Use printf with STM32 HAL UART DMA

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``` void dma_printf_putc(uint8_t c){ dma_ring_putc(&dmi.tx_ring, c); if(!dmi.sending){ uint16_t len = (uint16_t)dma_ring_available_linear(&dmi.tx_ring); dmi.previous_send_len = len; dmi.sending = true; HAL_UART_Transmit_DMA(dmi.huart, dmi.tx_ring.buf+dma_ring_get_r_ptr(&dmi.tx_ring), len); } } ``` if the len = 0, the DMA...

Hello, Having a look at you repo, the license is missing. Kind regards