392 lines
12 KiB
C
392 lines
12 KiB
C
/******************************************************************************
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* Copyright 2013-2014 Espressif Systems (Wuxi)
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*
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* FileName: uart.c
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*
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* Description: Two UART mode configration and interrupt handler.
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* Check your hardware connection while use this mode.
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*
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* Modification history:
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* 2014/3/12, v1.0 create this file.
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*******************************************************************************/
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#include "ets_sys.h"
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#include "osapi.h"
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#include "driver/uart.h"
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#include "platform.h"
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#include "user_config.h"
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#include "user_interface.h"
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#include "osapi.h"
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#define UART0 0
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#define UART1 1
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#ifndef FUNC_U0RXD
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#define FUNC_U0RXD 0
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#endif
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#ifndef FUNC_U0CTS
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#define FUNC_U0CTS 4
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#endif
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// For event signalling
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static platform_task_handle_t sig = 0;
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static uint8 *sig_flag;
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static uint8 isr_flag = 0;
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// UartDev is defined and initialized in rom code.
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extern UartDevice UartDev;
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#ifdef BIT_RATE_AUTOBAUD
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static os_timer_t autobaud_timer;
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#endif
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static void (*alt_uart0_tx)(char txchar);
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LOCAL void ICACHE_RAM_ATTR
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uart0_rx_intr_handler(void *para);
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/******************************************************************************
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* FunctionName : uart_wait_tx_empty
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* Description : Internal used function
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* Wait for TX FIFO to become empty.
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* Parameters : uart_no, use UART0 or UART1 defined ahead
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* Returns : NONE
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*******************************************************************************/
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LOCAL void ICACHE_FLASH_ATTR
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uart_wait_tx_empty(uint8 uart_no)
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{
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while ((READ_PERI_REG(UART_STATUS(uart_no)) & (UART_TXFIFO_CNT<<UART_TXFIFO_CNT_S)) > 0)
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;
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}
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/******************************************************************************
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* FunctionName : uart_config
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* Description : Internal used function
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* UART0 used for data TX/RX, RX buffer size is 0x100, interrupt enabled
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* UART1 just used for debug output
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* Parameters : uart_no, use UART0 or UART1 defined ahead
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* Returns : NONE
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*******************************************************************************/
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LOCAL void ICACHE_FLASH_ATTR
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uart_config(uint8 uart_no)
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{
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uart_wait_tx_empty(uart_no);
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if (uart_no == UART1) {
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
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} else {
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/* rcv_buff size if 0x100 */
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ETS_UART_INTR_ATTACH(uart0_rx_intr_handler, &(UartDev.rcv_buff));
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PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
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PIN_PULLUP_EN(PERIPHS_IO_MUX_U0RXD_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD);
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}
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uart_div_modify(uart_no, UART_CLK_FREQ / (UartDev.baut_rate));
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WRITE_PERI_REG(UART_CONF0(uart_no), ((UartDev.exist_parity & UART_PARITY_EN_M) << UART_PARITY_EN_S) //SET BIT AND PARITY MODE
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| ((UartDev.parity & UART_PARITY_M) <<UART_PARITY_S )
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| ((UartDev.stop_bits & UART_STOP_BIT_NUM) << UART_STOP_BIT_NUM_S)
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| ((UartDev.data_bits & UART_BIT_NUM) << UART_BIT_NUM_S));
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//clear rx and tx fifo,not ready
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SET_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
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CLEAR_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
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//set rx fifo trigger
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WRITE_PERI_REG(UART_CONF1(uart_no), (UartDev.rcv_buff.TrigLvl & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S);
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//clear all interrupt
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WRITE_PERI_REG(UART_INT_CLR(uart_no), 0xffff);
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//enable rx_interrupt
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SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA);
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}
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/******************************************************************************
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* FunctionName : uart0_alt
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* Description : Internal used function
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* UART0 pins changed to 13,15 if 'on' is set, else set to normal pins
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* Parameters : on - 1 = use alternate pins, 0 = use normal pins
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* Returns : NONE
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*******************************************************************************/
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void ICACHE_FLASH_ATTR
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uart0_alt(uint8 on)
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{
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uart_wait_tx_empty(UART0);
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if (on)
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{
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PIN_PULLUP_DIS(PERIPHS_IO_MUX_MTDO_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, FUNC_U0RTS);
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PIN_PULLUP_EN(PERIPHS_IO_MUX_MTCK_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_U0CTS);
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// now make RTS/CTS behave as TX/RX
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IOSWAP |= (1 << IOSWAPU0);
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}
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else
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{
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PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
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PIN_PULLUP_EN(PERIPHS_IO_MUX_U0RXD_U);
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PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD);
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// now make RX/TX behave as TX/RX
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IOSWAP &= ~(1 << IOSWAPU0);
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}
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}
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/******************************************************************************
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* FunctionName : uart_tx_one_char
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* Description : Internal used function
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* Use uart interface to transfer one char
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* Parameters : uint8 TxChar - character to tx
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* Returns : OK
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*******************************************************************************/
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STATUS ICACHE_FLASH_ATTR
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uart_tx_one_char(uint8 uart, uint8 TxChar)
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{
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if (uart == 0 && alt_uart0_tx) {
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(*alt_uart0_tx)(TxChar);
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return OK;
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}
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while (true)
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{
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uint32 fifo_cnt = READ_PERI_REG(UART_STATUS(uart)) & (UART_TXFIFO_CNT<<UART_TXFIFO_CNT_S);
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if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126) {
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break;
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}
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}
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WRITE_PERI_REG(UART_FIFO(uart) , TxChar);
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return OK;
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}
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/******************************************************************************
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* FunctionName : uart0_tx_buffer
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* Description : use uart0 to transfer buffer
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* Parameters : uint8 *buf - point to send buffer
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* uint16 len - buffer len
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* Returns :
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*******************************************************************************/
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void ICACHE_FLASH_ATTR
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uart0_tx_buffer(uint8 *buf, uint16 len)
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{
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uint16 i;
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for (i = 0; i < len; i++)
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{
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uart_tx_one_char(UART0, buf[i]);
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}
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}
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/******************************************************************************
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* FunctionName : uart0_sendStr
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* Description : use uart0 to transfer buffer
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* Parameters : uint8 *buf - point to send buffer
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* Returns :
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*******************************************************************************/
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void ICACHE_FLASH_ATTR uart0_sendStr(const char *str) {
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while(*str)
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uart0_putc(*str++);
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}
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/******************************************************************************
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* FunctionName : uart0_sendStr
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* Description : use uart0 to transfer buffer
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* Parameters : uint8 *buf - point to send buffer
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* size_t len - buffer len
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* Returns :
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*******************************************************************************/
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void ICACHE_FLASH_ATTR uart0_sendStrn(const char *str, size_t len) {
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size_t i;
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for(i = 0; i < len; i++)
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uart0_putc(*str++);
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}
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/******************************************************************************
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* FunctionName : uart0_putc
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* Description : use uart0 to transfer char
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* Parameters : uint8 c - send char
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* Returns :
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*******************************************************************************/
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void ICACHE_FLASH_ATTR uart0_putc(const char c)
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{
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if (c == '\n')
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{
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uart_tx_one_char(UART0, '\r');
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uart_tx_one_char(UART0, '\n');
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}
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else if (c == '\r')
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{
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}
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else
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{
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uart_tx_one_char(UART0, c);
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}
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}
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/******************************************************************************
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* FunctionName : uart0_rx_intr_handler
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* Description : Internal used function
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* UART0 interrupt handler, add self handle code inside
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* Parameters : void *para - point to ETS_UART_INTR_ATTACH's arg
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* Returns : NONE
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*******************************************************************************/
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LOCAL void
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uart0_rx_intr_handler(void *para)
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{
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/* uart0 and uart1 intr combine togther, when interrupt occur, see reg 0x3ff20020, bit2, bit0 represents
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* uart1 and uart0 respectively
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*/
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RcvMsgBuff *pRxBuff = (RcvMsgBuff *)para;
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uint8 RcvChar;
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bool got_input = false;
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if (UART_RXFIFO_FULL_INT_ST != (READ_PERI_REG(UART_INT_ST(UART0)) & UART_RXFIFO_FULL_INT_ST)) {
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return;
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}
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WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_FULL_INT_CLR);
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while (READ_PERI_REG(UART_STATUS(UART0)) & (UART_RXFIFO_CNT << UART_RXFIFO_CNT_S)) {
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RcvChar = READ_PERI_REG(UART_FIFO(UART0)) & 0xFF;
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/* you can add your handle code below.*/
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*(pRxBuff->pWritePos) = RcvChar;
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// insert here for get one command line from uart
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if (RcvChar == '\r' || RcvChar == '\n' ) {
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pRxBuff->BuffState = WRITE_OVER;
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}
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if (pRxBuff->pWritePos == (pRxBuff->pRcvMsgBuff + RX_BUFF_SIZE)) {
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// overflow ...we may need more error handle here.
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pRxBuff->pWritePos = pRxBuff->pRcvMsgBuff ;
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} else {
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pRxBuff->pWritePos++;
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}
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if (pRxBuff->pWritePos == pRxBuff->pReadPos){ // overflow one byte, need push pReadPos one byte ahead
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if (pRxBuff->pReadPos == (pRxBuff->pRcvMsgBuff + RX_BUFF_SIZE)) {
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pRxBuff->pReadPos = pRxBuff->pRcvMsgBuff ;
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} else {
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pRxBuff->pReadPos++;
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}
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}
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got_input = true;
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}
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if (got_input && sig) {
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// Only post a new handler request once the handler has fired clearing the last post
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if (isr_flag == *sig_flag) {
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isr_flag ^= 0x01;
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platform_post_high(sig, isr_flag);
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}
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}
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}
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#ifdef BIT_RATE_AUTOBAUD
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static void
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uart_autobaud_timeout(void *timer_arg)
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{
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uint32_t uart_no = (uint32_t) timer_arg;
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uint32_t divisor = uart_baudrate_detect(uart_no, 1);
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static int called_count = 0;
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// Shut off after two minutes to stop wasting CPU cycles if insufficient input received
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if (called_count++ > 10 * 60 * 2 || divisor) {
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os_timer_disarm(&autobaud_timer);
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}
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if (divisor) {
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uart_div_modify(uart_no, divisor);
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}
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}
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#include "pm/swtimer.h"
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static void
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uart_init_autobaud(uint32_t uart_no)
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{
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os_timer_setfn(&autobaud_timer, uart_autobaud_timeout, (void *) uart_no);
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SWTIMER_REG_CB(uart_autobaud_timeout, SWTIMER_DROP);
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//if autobaud hasn't done it's thing by the time light sleep triggered, it probably isn't going to happen.
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os_timer_arm(&autobaud_timer, 100, TRUE);
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}
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static void
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uart_stop_autobaud()
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{
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os_timer_disarm(&autobaud_timer);
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}
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#endif
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/******************************************************************************
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* FunctionName : uart_init
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* Description : user interface for init uart
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* Parameters : UartBautRate uart0_br - uart0 bautrate
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* UartBautRate uart1_br - uart1 bautrate
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* Returns : NONE
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*******************************************************************************/
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void ICACHE_FLASH_ATTR
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uart_init(UartBautRate uart0_br, UartBautRate uart1_br)
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{
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// rom use 74880 baut_rate, here reinitialize
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UartDev.baut_rate = uart0_br;
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uart_config(UART0);
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UartDev.baut_rate = uart1_br;
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uart_config(UART1);
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#ifdef BIT_RATE_AUTOBAUD
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uart_init_autobaud(0);
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#endif
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}
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void ICACHE_FLASH_ATTR
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uart_setup(uint8 uart_no)
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{
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#ifdef BIT_RATE_AUTOBAUD
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uart_stop_autobaud();
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#endif
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// poll Tx FIFO empty outside before disabling interrupts
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uart_wait_tx_empty(uart_no);
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ETS_UART_INTR_DISABLE();
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uart_config(uart_no);
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ETS_UART_INTR_ENABLE();
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}
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/******************************************************************************
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* FunctionName : uart_init_task
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* Description : user interface for init uart task callback
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* Parameters : os_signal_t sig_input - signal to post
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* uint8 *flag_input - flag of consumer task
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* Returns : NONE
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*******************************************************************************/
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void ICACHE_FLASH_ATTR uart_init_task(os_signal_t sig_input, uint8 *flag_input) {
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sig = sig_input;
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sig_flag = flag_input;
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}
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void ICACHE_FLASH_ATTR uart_set_alt_output_uart0(void (*fn)(char)) {
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alt_uart0_tx = fn;
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}
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UartConfig ICACHE_FLASH_ATTR uart_get_config(uint8 uart_no) {
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UartConfig config;
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config.baut_rate = UART_CLK_FREQ / READ_PERI_REG(UART_CLKDIV(uart_no));
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uint32_t conf = READ_PERI_REG(UART_CONF0(uart_no));
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config.exist_parity = (conf >> UART_PARITY_EN_S) & UART_PARITY_EN_M;
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config.parity = (conf >> UART_PARITY_S) & UART_PARITY_M;
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config.stop_bits = (conf >> UART_STOP_BIT_NUM_S) & UART_STOP_BIT_NUM;
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config.data_bits = (conf >> UART_BIT_NUM_S) & UART_BIT_NUM;
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return config;
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}
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