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//Stupid bit of code that does the bare minimum to make os_printf work.
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/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* Jeroen Domburg <jeroen@spritesmods.com> wrote this file. As long as you retain
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* this notice you can do whatever you want with this stuff. If we meet some day,
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* and you think this stuff is worth it, you can buy me a beer in return.
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* ----------------------------------------------------------------------------
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*/
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#include <esp8266.h>
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static void ICACHE_FLASH_ATTR stdoutUartTxd(char c) {
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//Wait until there is room in the FIFO
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while (((READ_PERI_REG(UART_STATUS(0))>>UART_TXFIFO_CNT_S)&UART_TXFIFO_CNT)>=126) ;
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//Send the character
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WRITE_PERI_REG(UART_FIFO(0), c);
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}
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static void ICACHE_FLASH_ATTR stdoutPutchar(char c) {
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//convert \n -> \r\n
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if (c=='\n') stdoutUartTxd('\r');
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stdoutUartTxd(c);
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}
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void stdoutInit() {
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//Enable TxD pin
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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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//Set baud rate and other serial parameters to 115200,n,8,1
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uart_div_modify(0, UART_CLK_FREQ/BIT_RATE_115200);
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WRITE_PERI_REG(UART_CONF0(0), (STICK_PARITY_DIS)|(ONE_STOP_BIT << UART_STOP_BIT_NUM_S)| \
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(EIGHT_BITS << UART_BIT_NUM_S));
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//Reset tx & rx fifo
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SET_PERI_REG_MASK(UART_CONF0(0), UART_RXFIFO_RST|UART_TXFIFO_RST);
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CLEAR_PERI_REG_MASK(UART_CONF0(0), UART_RXFIFO_RST|UART_TXFIFO_RST);
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//Clear pending interrupts
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WRITE_PERI_REG(UART_INT_CLR(0), 0xffff);
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//Install our own putchar handler
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os_install_putc1((void *)stdoutPutchar);
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}
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