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uart: Proper uart init

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CTCaer 2019-12-16 22:12:09 +02:00
parent 90060d1d83
commit da112a0ae9
2 changed files with 18 additions and 4 deletions
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11
bootloader/soc/uart.c
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@ -31,14 +31,21 @@ void uart_init(u32 idx, u32 baud)
// Misc settings.
u32 rate = (8 * baud + 408000000) / (16 * baud);
uart->UART_IER_DLAB = 0; // Disable interrupts.
uart->UART_MCR = 0; // Disable hardware flow control.
uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
uart->UART_THR_DLAB = (u8)rate; // Divisor latch LSB.
uart->UART_IER_DLAB = (u8)(rate >> 8); // Divisor latch MSB.
uart->UART_LCR = UART_LCR_WORD_LENGTH_8; // Disable DLAB.
(void)uart->UART_SPR;
// Setup and flush fifo.
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_RX_CLR | UART_IIR_FCR_TX_CLR;
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO;
(void)uart->UART_SPR;
usleep(20);
uart->UART_MCR = 0; // Disable hardware flow control.
usleep(96);
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_TX_CLR | UART_IIR_FCR_RX_CLR;
// Wait 3 symbols for baudrate change.
usleep(3 * ((baud + 999999) / baud));
uart_wait_idle(idx, UART_TX_IDLE | UART_RX_IDLE);
}

11
nyx/nyx_gui/soc/uart.c
View file

@ -31,14 +31,21 @@ void uart_init(u32 idx, u32 baud)
// Misc settings.
u32 rate = (8 * baud + 408000000) / (16 * baud);
uart->UART_IER_DLAB = 0; // Disable interrupts.
uart->UART_MCR = 0; // Disable hardware flow control.
uart->UART_LCR = UART_LCR_DLAB | UART_LCR_WORD_LENGTH_8; // Enable DLAB & set 8n1 mode.
uart->UART_THR_DLAB = (u8)rate; // Divisor latch LSB.
uart->UART_IER_DLAB = (u8)(rate >> 8); // Divisor latch MSB.
uart->UART_LCR = UART_LCR_WORD_LENGTH_8; // Disable DLAB.
(void)uart->UART_SPR;
// Setup and flush fifo.
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_RX_CLR | UART_IIR_FCR_TX_CLR;
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO;
(void)uart->UART_SPR;
usleep(20);
uart->UART_MCR = 0; // Disable hardware flow control.
usleep(96);
uart->UART_IIR_FCR = UART_IIR_FCR_EN_FIFO | UART_IIR_FCR_TX_CLR | UART_IIR_FCR_RX_CLR;
// Wait 3 symbols for baudrate change.
usleep(3 * ((baud + 999999) / baud));
uart_wait_idle(idx, UART_TX_IDLE | UART_RX_IDLE);
}