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nodemcu-firmware/app/driver/uart.c

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/******************************************************************************
* Copyright 2013-2014 Espressif Systems (Wuxi)
*
* FileName: uart.c
*
* Description: Two UART mode configration and interrupt handler.
* Check your hardware connection while use this mode.
*
* Modification history:
* 2014/3/12, v1.0 create this file.
*******************************************************************************/
#include "ets_sys.h"
#include "osapi.h"
#include "driver/uart.h"
#include "task/task.h"
#include "user_config.h"
#include "user_interface.h"
#include "osapi.h"
#define UART0 0
#define UART1 1
#ifndef FUNC_U0RXD
#define FUNC_U0RXD 0
#endif
#ifndef FUNC_U0CTS
#define FUNC_U0CTS 4
#endif
// For event signalling
static task_handle_t sig = 0;
// UartDev is defined and initialized in rom code.
extern UartDevice UartDev;
static os_timer_t autobaud_timer;
static void (*alt_uart0_tx)(char txchar);
LOCAL void ICACHE_RAM_ATTR
uart0_rx_intr_handler(void *para);
/******************************************************************************
* FunctionName : uart_config
* Description : Internal used function
* UART0 used for data TX/RX, RX buffer size is 0x100, interrupt enabled
* UART1 just used for debug output
* Parameters : uart_no, use UART0 or UART1 defined ahead
* Returns : NONE
*******************************************************************************/
LOCAL void ICACHE_FLASH_ATTR
uart_config(uint8 uart_no)
{
if (uart_no == UART1) {
PIN_FUNC_SELECT(PERIPHS_IO_MUX_GPIO2_U, FUNC_U1TXD_BK);
} else {
/* rcv_buff size if 0x100 */
ETS_UART_INTR_ATTACH(uart0_rx_intr_handler, &(UartDev.rcv_buff));
PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
PIN_PULLUP_EN(PERIPHS_IO_MUX_U0RXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD);
}
uart_div_modify(uart_no, UART_CLK_FREQ / (UartDev.baut_rate));
WRITE_PERI_REG(UART_CONF0(uart_no), ((UartDev.exist_parity & UART_PARITY_EN_M) << UART_PARITY_EN_S) //SET BIT AND PARITY MODE
| ((UartDev.parity & UART_PARITY_M) <<UART_PARITY_S )
| ((UartDev.stop_bits & UART_STOP_BIT_NUM) << UART_STOP_BIT_NUM_S)
| ((UartDev.data_bits & UART_BIT_NUM) << UART_BIT_NUM_S));
//clear rx and tx fifo,not ready
SET_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
CLEAR_PERI_REG_MASK(UART_CONF0(uart_no), UART_RXFIFO_RST | UART_TXFIFO_RST);
//set rx fifo trigger
WRITE_PERI_REG(UART_CONF1(uart_no), (UartDev.rcv_buff.TrigLvl & UART_RXFIFO_FULL_THRHD) << UART_RXFIFO_FULL_THRHD_S);
//clear all interrupt
WRITE_PERI_REG(UART_INT_CLR(uart_no), 0xffff);
//enable rx_interrupt
SET_PERI_REG_MASK(UART_INT_ENA(uart_no), UART_RXFIFO_FULL_INT_ENA);
}
/******************************************************************************
* FunctionName : uart0_alt
* Description : Internal used function
* UART0 pins changed to 13,15 if 'on' is set, else set to normal pins
* Parameters : on - 1 = use alternate pins, 0 = use normal pins
* Returns : NONE
*******************************************************************************/
void ICACHE_FLASH_ATTR
uart0_alt(uint8 on)
{
if (on)
{
PIN_PULLUP_DIS(PERIPHS_IO_MUX_MTDO_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDO_U, FUNC_U0RTS);
PIN_PULLUP_EN(PERIPHS_IO_MUX_MTCK_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_U0CTS);
// now make RTS/CTS behave as TX/RX
IOSWAP |= (1 << IOSWAPU0);
}
else
{
PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
PIN_PULLUP_EN(PERIPHS_IO_MUX_U0RXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0RXD_U, FUNC_U0RXD);
// now make RX/TX behave as TX/RX
IOSWAP &= ~(1 << IOSWAPU0);
}
}
/******************************************************************************
* FunctionName : uart_tx_one_char
* Description : Internal used function
* Use uart interface to transfer one char
* Parameters : uint8 TxChar - character to tx
* Returns : OK
*******************************************************************************/
STATUS ICACHE_FLASH_ATTR
uart_tx_one_char(uint8 uart, uint8 TxChar)
{
if (uart == 0 && alt_uart0_tx) {
(*alt_uart0_tx)(TxChar);
return OK;
}
while (true)
{
uint32 fifo_cnt = READ_PERI_REG(UART_STATUS(uart)) & (UART_TXFIFO_CNT<<UART_TXFIFO_CNT_S);
if ((fifo_cnt >> UART_TXFIFO_CNT_S & UART_TXFIFO_CNT) < 126) {
break;
}
}
WRITE_PERI_REG(UART_FIFO(uart) , TxChar);
return OK;
}
/******************************************************************************
* FunctionName : uart1_write_char
* Description : Internal used function
* Do some special deal while tx char is '\r' or '\n'
* Parameters : char c - character to tx
* Returns : NONE
*******************************************************************************/
LOCAL void ICACHE_FLASH_ATTR
uart1_write_char(char c)
{
if (c == '\n')
{
uart_tx_one_char(UART1, '\r');
uart_tx_one_char(UART1, '\n');
}
else if (c == '\r')
{
}
else
{
uart_tx_one_char(UART1, c);
}
}
/******************************************************************************
* FunctionName : uart0_tx_buffer
* Description : use uart0 to transfer buffer
* Parameters : uint8 *buf - point to send buffer
* uint16 len - buffer len
* Returns :
*******************************************************************************/
void ICACHE_FLASH_ATTR
uart0_tx_buffer(uint8 *buf, uint16 len)
{
uint16 i;
for (i = 0; i < len; i++)
{
uart_tx_one_char(UART0, buf[i]);
}
}
/******************************************************************************
* FunctionName : uart0_sendStr
* Description : use uart0 to transfer buffer
* Parameters : uint8 *buf - point to send buffer
* uint16 len - buffer len
* Returns :
*******************************************************************************/
void ICACHE_FLASH_ATTR uart0_sendStr(const char *str)
{
while(*str)
{
// uart_tx_one_char(UART0, *str++);
uart0_putc(*str++);
}
}
/******************************************************************************
* FunctionName : uart0_putc
* Description : use uart0 to transfer char
* Parameters : uint8 c - send char
* Returns :
*******************************************************************************/
void ICACHE_FLASH_ATTR uart0_putc(const char c)
{
if (c == '\n')
{
uart_tx_one_char(UART0, '\r');
uart_tx_one_char(UART0, '\n');
}
else if (c == '\r')
{
}
else
{
uart_tx_one_char(UART0, c);
}
}
/******************************************************************************
* FunctionName : uart0_rx_intr_handler
* Description : Internal used function
* UART0 interrupt handler, add self handle code inside
* Parameters : void *para - point to ETS_UART_INTR_ATTACH's arg
* Returns : NONE
*******************************************************************************/
LOCAL void
uart0_rx_intr_handler(void *para)
{
/* uart0 and uart1 intr combine togther, when interrupt occur, see reg 0x3ff20020, bit2, bit0 represents
* uart1 and uart0 respectively
*/
RcvMsgBuff *pRxBuff = (RcvMsgBuff *)para;
uint8 RcvChar;
bool got_input = false;
if (UART_RXFIFO_FULL_INT_ST != (READ_PERI_REG(UART_INT_ST(UART0)) & UART_RXFIFO_FULL_INT_ST)) {
return;
}
WRITE_PERI_REG(UART_INT_CLR(UART0), UART_RXFIFO_FULL_INT_CLR);
while (READ_PERI_REG(UART_STATUS(UART0)) & (UART_RXFIFO_CNT << UART_RXFIFO_CNT_S)) {
RcvChar = READ_PERI_REG(UART_FIFO(UART0)) & 0xFF;
/* you can add your handle code below.*/
*(pRxBuff->pWritePos) = RcvChar;
// insert here for get one command line from uart
if (RcvChar == '\r' || RcvChar == '\n' ) {
pRxBuff->BuffState = WRITE_OVER;
}
if (pRxBuff->pWritePos == (pRxBuff->pRcvMsgBuff + RX_BUFF_SIZE)) {
// overflow ...we may need more error handle here.
pRxBuff->pWritePos = pRxBuff->pRcvMsgBuff ;
} else {
pRxBuff->pWritePos++;
}
if (pRxBuff->pWritePos == pRxBuff->pReadPos){ // overflow one byte, need push pReadPos one byte ahead
if (pRxBuff->pReadPos == (pRxBuff->pRcvMsgBuff + RX_BUFF_SIZE)) {
pRxBuff->pReadPos = pRxBuff->pRcvMsgBuff ;
} else {
pRxBuff->pReadPos++;
}
}
got_input = true;
}
if (got_input && sig)
task_post_low (sig, false);
}
static void
uart_autobaud_timeout(void *timer_arg)
{
uint32_t uart_no = (uint32_t) timer_arg;
uint32_t divisor = uart_baudrate_detect(uart_no, 1);
static int called_count = 0;
// Shut off after two minutes to stop wasting CPU cycles if insufficient input received
if (called_count++ > 10 * 60 * 2 || divisor) {
os_timer_disarm(&autobaud_timer);
}
if (divisor) {
uart_div_modify(uart_no, divisor);
}
}
static void
uart_init_autobaud(uint32_t uart_no)
{
os_timer_setfn(&autobaud_timer, uart_autobaud_timeout, (void *) uart_no);
os_timer_arm(&autobaud_timer, 100, TRUE);
}
static void
uart_stop_autobaud()
{
os_timer_disarm(&autobaud_timer);
}
/******************************************************************************
* FunctionName : uart_init
* Description : user interface for init uart
* Parameters : UartBautRate uart0_br - uart0 bautrate
* UartBautRate uart1_br - uart1 bautrate
* uint8 task_prio - task priority to signal on input
* os_signal_t sig_input - signal to post
* Returns : NONE
*******************************************************************************/
void ICACHE_FLASH_ATTR
uart_init(UartBautRate uart0_br, UartBautRate uart1_br, os_signal_t sig_input)
{
sig = sig_input;
// rom use 74880 baut_rate, here reinitialize
UartDev.baut_rate = uart0_br;
uart_config(UART0);
UartDev.baut_rate = uart1_br;
uart_config(UART1);
#ifdef BIT_RATE_AUTOBAUD
uart_init_autobaud(0);
#endif
}
void ICACHE_FLASH_ATTR
uart_setup(uint8 uart_no)
{
#ifdef BIT_RATE_AUTOBAUD
uart_stop_autobaud();
#endif
ETS_UART_INTR_DISABLE();
uart_config(uart_no);
ETS_UART_INTR_ENABLE();
}
void ICACHE_FLASH_ATTR uart_set_alt_output_uart0(void (*fn)(char)) {
alt_uart0_tx = fn;
}
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