ESPTerm - ESP8266 terminal emulator. Branches: [master] patches, [work] next release
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espterm-firmware/user/stdout.c

51 lines
1.6 KiB

//Stupid bit of code that does the bare minimum to make os_printf work.
/*
* ----------------------------------------------------------------------------
* "THE BEER-WARE LICENSE" (Revision 42):
* Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain
* this notice you can do whatever you want with this stuff. If we meet some day,
* and you think this stuff is worth it, you can buy me a beer in return.
* ----------------------------------------------------------------------------
*/
#include "espmissingincludes.h"
#include "ets_sys.h"
#include "osapi.h"
#include "uart_hw.h"
static void ICACHE_FLASH_ATTR stdoutUartTxd(char c) {
//Wait until there is room in the FIFO
while (((READ_PERI_REG(UART_STATUS(0))>>UART_TXFIFO_CNT_S)&UART_TXFIFO_CNT)>=126) ;
//Send the character
WRITE_PERI_REG(UART_FIFO(0), c);
}
static void ICACHE_FLASH_ATTR stdoutPutchar(char c) {
//convert \n -> \r\n
if (c=='\n') stdoutUartTxd('\r');
stdoutUartTxd(c);
}
void stdoutInit() {
//Enable TxD pin
PIN_PULLUP_DIS(PERIPHS_IO_MUX_U0TXD_U);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_U0TXD_U, FUNC_U0TXD);
//Set baud rate and other serial parameters to 115200,n,8,1
uart_div_modify(0, UART_CLK_FREQ/BIT_RATE_115200);
WRITE_PERI_REG(UART_CONF0(0), (STICK_PARITY_DIS)|(ONE_STOP_BIT << UART_STOP_BIT_NUM_S)| \
(EIGHT_BITS << UART_BIT_NUM_S));
//Reset tx & rx fifo
SET_PERI_REG_MASK(UART_CONF0(0), UART_RXFIFO_RST|UART_TXFIFO_RST);
CLEAR_PERI_REG_MASK(UART_CONF0(0), UART_RXFIFO_RST|UART_TXFIFO_RST);
//Clear pending interrupts
WRITE_PERI_REG(UART_INT_CLR(0), 0xffff);
//Install our own putchar handler
os_install_putc1((void *)stdoutPutchar);
}