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working main.c example of printf

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Christina Quast
2014-12-13 13:33:29 +01:00
parent 99f9f7b504
commit 0aca529375
1 changed files with 7 additions and 121 deletions
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128
sam3s_example/mains/debug_uart_stdlib.c
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@@ -3,18 +3,7 @@
#include <stdio.h>
#include <string.h>
/*----------------------------------------------------------------------------
* * Definitions
* *----------------------------------------------------------------------------*/
/** Console baudrate always using 115200. */
#define CONSOLE_BAUDRATE 115200
/** Usart Hw interface used by the console (UART0). */
#define CONSOLE_USART UART0
/** Usart Hw ID used by the console (UART0). */
#define CONSOLE_ID ID_UART0
/** Pins description corresponding to Rxd,Txd, (UART pins) */
#define CONSOLE_PINS {PINS_UART}
extern void UART_PutString(const char *str, int len);
/*----------------------------------------------------------------------------
* * Variables
@@ -25,100 +14,6 @@ const Pin greenled = {LED_GREEN, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT};
static const Pin *led;
/** Is Console Initialized. */
static uint8_t _ucIsConsoleInitialized=0 ;
/**
* \brief Configures an USART peripheral with the specified parameters.
*
* \param baudrate Baudrate at which the USART should operate (in Hz).
* \param masterClock Frequency of the system master clock (in Hz).
*/
extern void UART_Configure( uint32_t baudrate, uint32_t masterClock)
{
const Pin pPins[] = CONSOLE_PINS;
Uart *pUart = CONSOLE_USART;
/* Configure PIO */
PIO_Configure(pPins, PIO_LISTSIZE(pPins));
/* Configure PMC */
/* PMC_PCER0 : (PMC Offset: 0x0010) Peripheral Clock Enable Register 0 -------- */
PMC->PMC_PCER0 = 1 << CONSOLE_ID;
/* Reset and disable receiver & transmitter */
pUart->UART_CR = UART_CR_RSTRX | UART_CR_RSTTX
| UART_CR_RXDIS | UART_CR_TXDIS;
/* Configure mode */
pUart->UART_MR = UART_MR_PAR_NO; // No parity
/* Configure baudrate */
/* Asynchronous, no oversampling */
// BRG: Baud rate generator
pUart->UART_BRGR = (masterClock / baudrate) / 16;
/* Disable PDC channel */
// PDC: Peripheral DMA
// TCR: Transfer Control Register
pUart->UART_PTCR = UART_PTCR_RXTDIS | UART_PTCR_TXTDIS;
/* Enable receiver and transmitter */
pUart->UART_CR = UART_CR_RXEN | UART_CR_TXEN;
_ucIsConsoleInitialized=1 ;
}
/**
* \brief Outputs a character on the UART line.
*
* \note This function is synchronous (i.e. uses polling).
* \param c Character to send.
*/
extern void UART_PutChar( uint8_t c )
{
Uart *pUart=CONSOLE_USART ;
if ( !_ucIsConsoleInitialized )
{
UART_Configure(CONSOLE_BAUDRATE, BOARD_MCK);
}
/* Wait for the transmitter to be ready */
// UART_SR: Statzs register
while ( (pUart->UART_SR & UART_SR_TXEMPTY) == 0 ) ;
/* Send character */
// THR: transmit holding register
pUart->UART_THR=c ;
}
/**
* \brief Input a character from the UART line.
*
* \note This function is synchronous
* \return character received.
*/
extern uint32_t UART_GetChar( void )
{
Uart *pUart=CONSOLE_USART ;
if ( !_ucIsConsoleInitialized )
{
UART_Configure(CONSOLE_BAUDRATE, BOARD_MCK);
}
while ( (pUart->UART_SR & UART_SR_RXRDY) == 0 ) ;
return pUart->UART_RHR ;
}
void Configure_LED() {
PIO_Configure(&greenled, PIO_LISTSIZE(greenled));
PIO_Configure(&redled, PIO_LISTSIZE(redled));
@@ -127,27 +22,18 @@ void Configure_LED() {
led = &redled;
}
void UART_PutString(char *str, int len) {
int i;
for (i=0; i<len; i++) {
UART_PutChar(*str++);
}
}
int main() {
char *cmdp;
// FIXME: initialize system clock done in lowlevelinit?
size_t ret = 0;
Configure_LED();
size_t ret = asprintf(&cmdp, "Clockval: %d\r\n", BOARD_MCK);
ret = printf("Clockval: %d\r\n", BOARD_MCK);
if (ret != strlen(cmdp)){
PIO_Clear(&redled);
if (ret < 0){
PIO_Clear(&redled);
} else {
PIO_Clear(&greenled);
PIO_Clear(&greenled);
while (1) {
UART_PutString(cmdp, strlen(cmdp));
printf("Clockval**++????: %d\r\n", BOARD_MCK);
}
}