fprintf Library

fprintf Library

This is a simple implementation of fprintf.

{{< hint color=“info” >}} This library is provided for source code compatibility. For new implementations, it is recommended to use TWENETmcu/printf. {{< /hint >}}

Reference

• TWENETmcu/printf - printf library (open source)
• TWENETstgs - TWE_fprintf(), etc.

tsFILE

A structure that defines the output destination specified by vfPrintf() and vPutChar().

Members

{% hint style=“info” %} SERIAL_bTxChar() puts the byte passed as u8Char into the FIFO queue within the SERIAL library.

By preparing your own output function, you can use this for outputting strings to destinations other than UART. {% endhint %}

Sample code

#include "serial.h"
#include "fprintf.h"

tsFILE sSerStream;
tsSerialPortSetup sSerPort;

void vSerialInit(uint32 u32Baud, tsUartOpt *pUartOpt) {
	// initialize sSerPort
	...
	SERIAL_vInit(&sSerPort);

	// for vfPrintf()
	sSerStream.bPutChar = SERIAL_bTxChar;
	sSerStream.u8Device = E_AHI_UART_0;
}

void vSerOut() {
    vfPrintf(&sSerStream, "HELLO!");
}

Here is an example of the character LCD output code.

#include "serial.h"
#include "fprintf.h"

tsFILE sLcdStream;

// handle LCD display
PUBLIC bool_t LCD_bTxChar(uint8 u8Device, uint8 u8Data) {
	int i;

	switch (u8Data) {
	case '\n':
	...
}

void vInitHardware() {
    /* Initialise the LCD */
    vLcdReset(3, 0);

    /* register for vfPrintf() */
    sLcdStream.bPutChar = LCD_bTxChar;
    sLcdStream.u8Device = 0xFF;
}

void vSomeOutput() {
    vfPrintf(&sLcdStream, "Hello World!\n");
}

vfPrintf()

Explanation

This function outputs to the destination specified by the tsFILE structure (UART) using printf format.

Arguments

Supported Formats

Return Value

None.

Sample

void cbToCoNet_vMain(void) {
	while (!SERIAL_bRxQueueEmpty(sSerPort.u8SerialPort)) {
		int16 i16Char;
		i16Char = SERIAL_i16RxChar(sSerPort.u8SerialPort);
		vfPrintf(&sSerStream, "\n\r## [%c] --> ", i16Char);
	    SERIAL_vFlush(sSerStream.u8Device);
		...
	}
}

vPutChar()

Explanation

This function outputs one byte to the destination specified by the tsFILE structure (UART).

Arguments

Return Value

None

Sample

#define IS_ASC(c) ((c) >= 0x20 && (c) <= 0x7e)

void cbToCoNet_vRxEvent(tsRxDataApp *pRx) {
	uint8 u8i;
	vfPrintf(&sSerStream, LB"RX(len=%d):[", pRx->u8Len);
	for (i = 0; i < pRx->u8Len; i++) {
		uint8 c = pRx->auData[i];
		vPutChar(&sSerStream, IS_ASC(c) ? c : '.');
	}
}