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cpu/esp32: add internal _uart_set_mode function

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Configuration of UART mode is realized by an internal function which is also used by UART initialization function.
This commit is contained in:
Gunar Schorcht 2019-03-26 10:19:42 +01:00 committed by Schorcht
parent b9a8b98a9b
commit ec013f74a7
1 changed files with 79 additions and 0 deletions
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79
cpu/esp32/periph/uart.c
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@ -113,6 +113,8 @@ extern void uart_div_modify(uint8_t uart_no, uint32_t div);
/* forward declaration of internal functions */
static int _uart_set_baudrate(uart_t uart, uint32_t baudrate);
static int _uart_set_mode(uart_t uart, uart_data_bits_t data_bits,
uart_parity_t parity, uart_stop_bits_t stop_bits);
static uint8_t IRAM _uart_rx_one_char (uart_t uart);
static void _uart_tx_one_char(uart_t uart, uint8_t data);
static void _uart_intr_enable (uart_t uart);
@ -308,6 +310,12 @@ static void _uart_config (uart_t uart)
return;
}
/* set number of data bits, stop bits and parity mode */
if (_uart_set_mode(uart, _uarts[uart].data, _uarts[uart].stop,
_uarts[uart].parity) != UART_OK) {
return;
}
/* reset the FIFOs */
_uarts[uart].regs->conf0.rxfifo_rst = 1;
_uarts[uart].regs->conf0.rxfifo_rst = 0;
@ -354,3 +362,74 @@ static int _uart_set_baudrate(uart_t uart, uint32_t baudrate)
critical_exit();
return UART_OK;
}
static int _uart_set_mode(uart_t uart, uart_data_bits_t data_bits,
uart_parity_t parity, uart_stop_bits_t stop_bits)
{
DEBUG("%s uart=%d, data_bits=%d parity=%d stop_bits=%d\n", __func__,
uart, data_bits, parity, stop_bits);
CHECK_PARAM_RET (uart < UART_NUMOF, UART_NODEV);
critical_enter();
/* set number of data bits */
switch (data_bits) {
case UART_DATA_BITS_5: _uarts[uart].regs->conf0.bit_num = 0; break;
case UART_DATA_BITS_6: _uarts[uart].regs->conf0.bit_num = 1; break;
case UART_DATA_BITS_7: _uarts[uart].regs->conf0.bit_num = 2; break;
case UART_DATA_BITS_8: _uarts[uart].regs->conf0.bit_num = 3; break;
default: LOG_TAG_ERROR("uart", "invalid number of data bits\n");
critical_exit();
return UART_NOMODE;
}
/* store changed number of data bits in configuration */
_uarts[uart].data = data_bits;
/* set number of stop bits */
#ifdef MCU_ESP32
/* workaround for hardware bug when stop bits are set to 2-bit mode. */
switch (stop_bits) {
case UART_STOP_BITS_1: _uarts[uart].regs->conf0.stop_bit_num = 1;
_uarts[uart].regs->rs485_conf.dl1_en = 0;
break;
case UART_STOP_BITS_2: _uarts[uart].regs->conf0.stop_bit_num = 1;
_uarts[uart].regs->rs485_conf.dl1_en = 1;
break;
default: LOG_TAG_ERROR("uart", "invalid number of stop bits\n");
critical_exit();
return UART_NOMODE;
}
#else
switch (stop_bits) {
case UART_STOP_BITS_1: _uarts[uart].regs->conf0.stop_bit_num = 1; break;
case UART_STOP_BITS_2: _uarts[uart].regs->conf0.stop_bit_num = 3; break;
default: LOG_TAG_ERROR("uart", "invalid number of stop bits\n");
critical_exit();
return UART_NOMODE;
}
#endif
/* store changed number of stop bits in configuration */
_uarts[uart].stop = stop_bits;
/* set parity mode */
switch (parity) {
case UART_PARITY_NONE: _uarts[uart].regs->conf0.parity_en = 0;
break;
case UART_PARITY_EVEN: _uarts[uart].regs->conf0.parity = 0;
_uarts[uart].regs->conf0.parity_en = 1;
break;
case UART_PARITY_ODD: _uarts[uart].regs->conf0.parity = 1;
_uarts[uart].regs->conf0.parity_en = 1;
break;
default: LOG_TAG_ERROR("uart", "invalid or unsupported parity mode\n");
critical_exit();
return UART_NOMODE;
}
/* store changed parity in configuration */
_uarts[uart].parity = parity;
critical_exit();
return UART_OK;
}