diff options
Diffstat (limited to 'firmware/drivers/uart.c')
| -rw-r--r-- | firmware/drivers/uart.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/firmware/drivers/uart.c b/firmware/drivers/uart.c new file mode 100644 index 0000000..28a6e00 --- /dev/null +++ b/firmware/drivers/uart.c @@ -0,0 +1,169 @@ +/****************************************************************************
+ * $Id:: uart.c 5751 2010-11-30 23:56:11Z usb00423 $
+ * Project: NXP LPC17xx UART example
+ *
+ * Description:
+ * This file contains UART code example which include UART initialization,
+ * UART interrupt handler, and APIs for UART access.
+ *
+ ****************************************************************************
+ * Software that is described herein is for illustrative purposes only
+ * which provides customers with programming information regarding the
+ * products. This software is supplied "AS IS" without any warranties.
+ * NXP Semiconductors assumes no responsibility or liability for the
+ * use of the software, conveys no license or title under any patent,
+ * copyright, or mask work right to the product. NXP Semiconductors
+ * reserves the right to make changes in the software without
+ * notification. NXP Semiconductors also make no representation or
+ * warranty that such application will be suitable for the specified
+ * use without further testing or modification.
+****************************************************************************/
+#include <LPC17xx.h>
+#include <stdint.h>//"type.h"
+#include "uart.h"
+
+#define TRUE 1
+#define FALSE 0
+
+volatile uint32_t UART0Status, UART1Status;
+volatile uint8_t UART0TxEmpty = 1, UART1TxEmpty = 1;
+
+/*****************************************************************************
+** Function name: UARTInit
+**
+** Descriptions: Initialize UART port, setup pin select,
+** clock, parity, stop bits, FIFO, etc.
+**
+** parameters: portNum(0 or 1) and UART baudrate
+** Returned value: true or false, return false only if the
+** interrupt handler can't be installed to the
+** VIC table
+**
+*****************************************************************************/
+uint32_t UARTInit( uint32_t PortNum, uint32_t baudrate )
+{
+ uint32_t Fdiv;
+ uint32_t pclkdiv, pclk;
+
+ uint32_t SystemFrequency = SystemCoreClock;
+
+ if ( PortNum == 0 )
+ {
+ LPC_PINCON->PINSEL0 &= ~0x000000F0;
+ LPC_PINCON->PINSEL0 |= 0x00000050; /* RxD0 is P0.3 and TxD0 is P0.2 */
+ /* By default, the PCLKSELx value is zero, thus, the PCLK for
+ all the peripherals is 1/4 of the SystemFrequency. */
+ /* Bit 6~7 is for UART0 */
+ pclkdiv = (LPC_SC->PCLKSEL0 >> 6) & 0x03;
+ switch ( pclkdiv )
+ {
+ case 0x00:
+ default:
+ pclk = SystemFrequency/4;
+ break;
+ case 0x01:
+ pclk = SystemFrequency;
+ break;
+ case 0x02:
+ pclk = SystemFrequency/2;
+ break;
+ case 0x03:
+ pclk = SystemFrequency/8;
+ break;
+ }
+
+ LPC_UART0->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
+ Fdiv = ( pclk / 16 ) / baudrate ; /*baud rate */
+ LPC_UART0->DLM = Fdiv / 256;
+ LPC_UART0->DLL = Fdiv % 256;
+ LPC_UART0->LCR = 0x03; /* DLAB = 0 */
+ LPC_UART0->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
+
+ // NVIC_EnableIRQ(UART0_IRQn);
+
+ //LPC_UART0->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART0 interrupt */
+ return (TRUE);
+ }
+ else if ( PortNum == 1 )
+ {
+ LPC_PINCON->PINSEL4 &= ~0x0000000F;
+ LPC_PINCON->PINSEL4 |= 0x0000000A; /* Enable RxD1 P2.1, TxD1 P2.0 */
+
+ /* By default, the PCLKSELx value is zero, thus, the PCLK for
+ all the peripherals is 1/4 of the SystemFrequency. */
+ /* Bit 8,9 are for UART1 */
+ pclkdiv = (LPC_SC->PCLKSEL0 >> 8) & 0x03;
+ switch ( pclkdiv )
+ {
+ case 0x00:
+ default:
+ pclk = SystemFrequency/4;
+ break;
+ case 0x01:
+ pclk = SystemFrequency;
+ break;
+ case 0x02:
+ pclk = SystemFrequency/2;
+ break;
+ case 0x03:
+ pclk = SystemFrequency/8;
+ break;
+ }
+
+ LPC_UART1->LCR = 0x83; /* 8 bits, no Parity, 1 Stop bit */
+ Fdiv = ( pclk / 16 ) / baudrate ; /*baud rate */
+ LPC_UART1->DLM = Fdiv / 256;
+ LPC_UART1->DLL = Fdiv % 256;
+ LPC_UART1->LCR = 0x03; /* DLAB = 0 */
+ LPC_UART1->FCR = 0x07; /* Enable and reset TX and RX FIFO. */
+
+ // NVIC_EnableIRQ(UART1_IRQn);
+
+ LPC_UART1->IER = IER_RBR | IER_THRE | IER_RLS; /* Enable UART1 interrupt */
+ return (TRUE);
+ }
+ return( FALSE );
+}
+
+/*****************************************************************************
+** Function name: UARTSend
+**
+** Descriptions: Send a block of data to the UART 0 port based
+** on the data length
+**
+** parameters: portNum, buffer pointer, and data length
+** Returned value: None
+**
+*****************************************************************************/
+void UARTSend( uint32_t portNum, char *BufferPtr, uint32_t Length )
+{
+ if ( portNum == 0 )
+ {
+ while ( Length != 0 )
+ {
+ /* THRE status, contain valid data */
+ //while ( !(UART0TxEmpty & 0x01) );
+ LPC_UART0->THR = *BufferPtr;
+ UART0TxEmpty = 0; /* not empty in the THR until it shifts out */
+ BufferPtr++;
+ Length--;
+ }
+ }
+ else
+ {
+ while ( Length != 0 )
+ {
+ /* THRE status, contain valid data */
+ while ( !(UART1TxEmpty & 0x01) );
+ LPC_UART1->THR = *BufferPtr;
+ UART1TxEmpty = 0; /* not empty in the THR until it shifts out */
+ BufferPtr++;
+ Length--;
+ }
+ }
+ return;
+}
+
+/******************************************************************************
+** End Of File
+******************************************************************************/
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