Finsh USART configuration logic
This commit is contained in:
Gregory Nutt
parent
956fc38fca
commit
75b728498a
@ -41,6 +41,7 @@
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#include <stdint.h>
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#include <stdbool.h>
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#include <assert.h>
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#include <arch/board/board.h>
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@ -93,6 +94,74 @@
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# endif
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#endif /* HAVE_SERIAL_CONSOLE */
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: efm32_setbaud
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*
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* Description:
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* Set optimal oversampling and set the baud for this U[S]ART.
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*
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****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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static void efm32_setbaud(uintptr_t base, uint32_t baud)
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{
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uint64_t clkdiv;
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uint32_t oversample;
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uint32_t regval;
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uint32_t ovs;
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/* Select oversampling */
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if (baud <= (BOARD_HFPERCLK_FREQUENCY / 4))
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{
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oversample = 16;
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ovs = USART_CTRL_OVS_X16;
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}
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else if (baud <= (BOARD_HFPERCLK_FREQUENCY / 6))
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{
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oversample = 16;
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ovs = USART_CTRL_OVS_X16;
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}
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else if (baud <= (BOARD_HFPERCLK_FREQUENCY / 8))
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{
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oversample = 8;
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ovs = USART_CTRL_OVS_X8;
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}
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else /* if (baud <= (BOARD_HFPERCLK_FREQUENCY / 16)) */
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{
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DEBUGASSERT(baud <= (BOARD_HFPERCLK_FREQUENCY / 16));
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oversample = 16;
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ovs = USART_CTRL_OVS_X16;
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}
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/* CLKDIV in asynchronous mode is given by:
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*
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* CLKDIV = 256 * (fHFPERCLK/(oversample * baud) - 1)
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* or
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* CLKDIV = (256 * fHFPERCLK)/(oversample * baud) - 256
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*/
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clkdiv = ((uint64_t)BOARD_HFPERCLK_FREQUENCY << 8) / ((uint64_t)baud * oversample);
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clkdiv -= 256;
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DEBUGASSERT(clkdiv <= _USART_CLKDIV_MASK);
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/* Set up the select oversampling and baud */
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regval = getreg32(base + EFM32_USART_CTRL_OFFSET);
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regval &= ~_USART_CTRL_OVS_MASK;
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regval |= ovs;
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putreg32(regval, base + EFM32_USART_CTRL_OFFSET);
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putreg32((uint32_t)clkdiv & _USART_CTRL_OVS_MASK,
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base + EFM32_USART_CLKDIV_OFFSET);
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}
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#endif
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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@ -235,9 +304,146 @@ void efm32_lowputc(uint32_t ch)
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*****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void efm32_uartconfigure(uintptr_t uart_base, uint32_t baud,
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unsigned int parity, unsigned int nbits, bool stop2)
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void efm32_uartconfigure(uintptr_t base, uint32_t baud, unsigned int parity,
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unsigned int nbits, bool stop2)
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{
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#warning Missing logic
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uint32_t regval = 0;
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/* Make sure that the U[S]ART registers are in the reset state (except for
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* ROUTE information which must be preserved).
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*/
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efm32_uartreset(base);
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/* Configure number of data bits */
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switch (nbits)
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{
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case 4:
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regval |= USART_FRAME_DATABITS_FOUR;
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break;
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case 5:
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regval |= USART_FRAME_DATABITS_FIVE;
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break;
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case 6:
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regval |= USART_FRAME_DATABITS_SIX;
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break;
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case 7:
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regval |= USART_FRAME_DATABITS_SEVEN;
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break;
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default:
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case 8:
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regval |= USART_FRAME_DATABITS_EIGHT;
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break;
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case 9:
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regval |= USART_FRAME_DATABITS_NINE;
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break;
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case 10:
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regval |= USART_FRAME_DATABITS_TEN;
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break;
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case 11:
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regval |= USART_FRAME_DATABITS_ELEVEN;
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break;
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case 12:
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regval |= USART_FRAME_DATABITS_TWELVE;
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break;
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case 13:
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regval |= USART_FRAME_DATABITS_THIRTEEN;
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break;
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case 14:
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regval |= USART_FRAME_DATABITS_FOURTEEN;
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break;
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case 15:
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regval |= USART_FRAME_DATABITS_FIFTEEN;
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break;
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case 16:
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regval |= USART_FRAME_DATABITS_SIXTEEN;
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break;
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}
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/* Configure parity */
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switch (parity)
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{
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default:
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case 0:
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regval |= USART_FRAME_PARITY_NONE;
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break;
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case 1:
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regval |= USART_FRAME_PARITY_ODD;
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break;
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case 2:
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regval |= USART_FRAME_PARITY_EVEN;
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break;
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}
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/* Configure stop bits */
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if (stop2)
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{
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regval |= USART_FRAME_STOPBITS_TWO;
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}
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else
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{
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regval |= USART_FRAME_STOPBITS_ONE;
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}
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putreg32(regval, base + EFM32_USART_FRAME_OFFSET);
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/* Set the baud clock divisor */
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efm32_setbaud(base, baud);
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/* Enable the U[S]ART */
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putreg32(USART_CMD_RXEN | USART_CMD_TXEN, base + EFM32_USART_CMD_OFFSET);
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}
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#endif
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/*****************************************************************************
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* Name: efm32_uartreset
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*
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* Description:
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* Reset the USART/UART by disabling it and restoring all of the registers
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* to the initial, reset value. Only the ROUTE data set by efm32_lowsetup
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* is preserved.
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*
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*****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void efm32_uartreset(uintptr_t base)
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{
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putreg32(USART_CMD_RXDIS | USART_CMD_TXDIS | USART_CMD_MASTERDIS |
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USART_CMD_RXBLOCKDIS | USART_CMD_TXTRIDIS | USART_CMD_CLEARTX |
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USART_CMD_CLEARRX, base + EFM32_USART_CMD_OFFSET);
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putreg32(_USART_CTRL_RESETVALUE, base + EFM32_USART_CTRL_OFFSET);
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putreg32(_USART_FRAME_RESETVALUE, base + EFM32_USART_FRAME_OFFSET);
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putreg32(_USART_TRIGCTRL_RESETVALUE, base + EFM32_USART_TRIGCTRL_OFFSET);
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putreg32(_USART_CLKDIV_RESETVALUE, base + EFM32_USART_CLKDIV_OFFSET);
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putreg32(_USART_IEN_RESETVALUE, base + EFM32_USART_IEN_OFFSET);
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putreg32(_USART_IFC_MASK, base + EFM32_USART_IFC_OFFSET);
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putreg32(_USART_IRCTRL_RESETVALUE, base + EFM32_USART_IRCTRL_OFFSET);
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#if defined(EFM32_USART_INPUT_OFFSET)
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putreg32(_USART_INPUT_RESETVALUE, base + EFM32_USART_INPUT_OFFSET);
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#endif
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#if defined(EFM32_USART_I2SCTRL_OFFSET)
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putreg32(_USART_I2SCTRL_RESETVALUE, base + EFM32_USART_I2SCTRL_OFFSET);
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#endif
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}
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#endif
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@ -84,8 +84,22 @@ void efm32_lowputc(uint32_t ch);
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*****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void efm32_uartconfigure(uintptr_t uart_base, uint32_t baud,
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unsigned int parity, unsigned int nbits, bool stop2);
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void efm32_uartconfigure(uintptr_t base, uint32_t baud, unsigned int parity,
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unsigned int nbits, bool stop2);
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#endif
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/*****************************************************************************
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* Name: efm32_uartreset
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*
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* Description:
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* Reset the USART/UART by disabling it and restoring all of the registers
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* to the initial, reset value. Only the ROUTE data set by efm32_lowsetup
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* is preserved.
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*
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*****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void efm32_uartreset(uintptr_t base);
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#endif
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#endif /* __ARCH_ARM_SRC_EFM32_EFM32_LOWPUTC_H */
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@ -642,6 +642,13 @@ static void efm32_shutdown(struct uart_dev_s *dev)
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/* Disable interrupts */
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efm32_restoreuartint(priv, 0);
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/* Reset the USART/UART by disabling it and restoring all of the registers
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* to the initial, reset value. Only the ROUTE data set by efm32_lowsetup
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* is preserved.
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*/
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efm32_uartreset(priv->config->uartbase);
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}
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/****************************************************************************
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