Hello, my name is Alex and I am new in this community. I recently started a project using the FRDM-KL05Z board and I am interested in some examples on how to configure the UART protocol without Processor Expert. So far I found some init and read/write methods but they don't seem to work properly.
Below you can find the code for this methods :
void uart_init (UART_MemMapPtr uartch, int sysclk, int baud)
{
register uint16 sbr, brfa;
uint8 temp;
/* Enable the clock to the selected UART */
if(uartch == UART0_BASE_PTR)
SIM_SCGC4 |= SIM_SCGC4_UART0_MASK;
else
if (uartch == UART1_BASE_PTR)
SIM_SCGC4 |= SIM_SCGC4_UART1_MASK;
else
if (uartch == UART2_BASE_PTR)
SIM_SCGC4 |= SIM_SCGC4_UART2_MASK;
else
if(uartch == UART3_BASE_PTR)
SIM_SCGC4 |= SIM_SCGC4_UART3_MASK;
else
if(uartch == UART4_BASE_PTR)
SIM_SCGC1 |= SIM_SCGC1_UART4_MASK;
else
SIM_SCGC1 |= SIM_SCGC1_UART5_MASK;
/* Make sure that the transmitter and receiver are disabled while we
* change settings.
*/
UART_C2_REG(uartch) &= ~(UART_C2_TE_MASK
| UART_C2_RE_MASK );
/* Configure the UART for 8-bit mode, no parity */
UART_C1_REG(uartch) = 0; /* We need all default settings, so entire register is cleared */
/* Calculate baud settings */
sbr = (uint16)((sysclk*1000)/(baud * 16));
/* Save off the current value of the UARTx_BDH except for the SBR field */
temp = UART_BDH_REG(uartch) & ~(UART_BDH_SBR(0x1F));
UART_BDH_REG(uartch) = temp | UART_BDH_SBR(((sbr & 0x1F00) >> 8));
UART_BDL_REG(uartch) = (uint8)(sbr & UART_BDL_SBR_MASK);
/* Determine if a fractional divider is needed to get closer to the baud rate */
brfa = (((sysclk*32000)/(baud * 16)) - (sbr * 32));
/* Save off the current value of the UARTx_C4 register except for the BRFA field */
temp = UART_C4_REG(uartch) & ~(UART_C4_BRFA(0x1F));
UART_C4_REG(uartch) = temp | UART_C4_BRFA(brfa);
/* Enable receiver and transmitter */
UART_C2_REG(uartch) |= (UART_C2_TE_MASK
| UART_C2_RE_MASK );
}
/********************************************************************/
/*
* Wait for a character to be received on the specified UART
*
* Parameters:
* channel UART channel to read from
*
* Return Values:
* the received character
*/
char uart_getchar (UART_MemMapPtr channel)
{
/* Wait until character has been received */
while (!(UART_S1_REG(channel) & UART_S1_RDRF_MASK));
/* Return the 8-bit data from the receiver */
return UART_D_REG(channel);
}
/********************************************************************/
/*
* Wait for space in the UART Tx FIFO and then send a character
*
* Parameters:
* channel UART channel to send to
* ch character to send
*/
void uart_putchar (UART_MemMapPtr channel, char ch)
{
/* Wait until space is available in the FIFO */
while(!(UART_S1_REG(channel) & UART_S1_TDRE_MASK));
/* Send the character */
UART_D_REG(channel) = (uint8)ch;
}
/********************************************************************/
/*
* Check to see if a character has been received
*
* Parameters:
* channel UART channel to check for a character
*
* Return values:
* 0 No character received
* 1 Character has been received
*/
int uart_getchar_present (UART_MemMapPtr channel)
{
return (UART_S1_REG(channel) & UART_S1_RDRF_MASK);
}
I was just wondering if anyone used those routines or something similar or has an example on how to communicate with a terminal using the UART protocol on the FRDM-KL05Z board.
This is my first time using a freescale microcontroller so I don't fully understand all it's aspects so any information will be greatly appreciated.
