@DOC_TITLE@ Xmega Application Note usart_example_interrupt.cGo to the documentation of this file.00001 /* This file has been prepared for Doxygen automatic documentation generation.*/ 00051 #include "usart_driver.h" 00052 #include "avr_compiler.h" 00053 00055 #define NUM_BYTES 3 00056 00057 #define USART USARTC0 00058 00060 USART_data_t USART_data; 00062 uint8_t sendArray[NUM_BYTES] = {0x55, 0xaa, 0xf0}; 00064 uint8_t receiveArray[NUM_BYTES]; 00066 bool success; 00067 00068 00082 int main(void) 00083 { 00084 /* counter variable. */ 00085 uint8_t i; 00086 00087 /* This PORT setting is only valid to USARTC0 if other USARTs is used a 00088 * different PORT and/or pins are used. */ 00089 /* PC3 (TXD0) as output. */ 00090 PORTC.DIRSET = PIN3_bm; 00091 /* PC2 (RXD0) as input. */ 00092 PORTC.DIRCLR = PIN2_bm; 00093 00094 /* Use USARTC0 and initialize buffers. */ 00095 USART_InterruptDriver_Initialize(&USART_data, &USART, USART_DREINTLVL_LO_gc); 00096 00097 /* USARTC0, 8 Data bits, No Parity, 1 Stop bit. */ 00098 USART_Format_Set(USART_data.usart, USART_CHSIZE_8BIT_gc, 00099 USART_PMODE_DISABLED_gc, false); 00100 00101 /* Enable RXC interrupt. */ 00102 USART_RxdInterruptLevel_Set(USART_data.usart, USART_RXCINTLVL_LO_gc); 00103 00104 /* Set Baudrate to 9600 bps: 00105 * Use the default I/O clock frequency that is 2 MHz. 00106 * Do not use the baudrate scale factor 00107 * 00108 * Baudrate select = (1/(16*(((I/O clock frequency)/Baudrate)-1) 00109 * = 12 00110 */ 00111 USART_Baudrate_Set(&USART, 12 , 0); 00112 00113 /* Enable both RX and TX. */ 00114 USART_Rx_Enable(USART_data.usart); 00115 USART_Tx_Enable(USART_data.usart); 00116 00117 /* Enable PMIC interrupt level low. */ 00118 PMIC.CTRL |= PMIC_LOLVLEX_bm; 00119 00120 /* Enable global interrupts. */ 00121 sei(); 00122 00123 /* Send sendArray. */ 00124 i = 0; 00125 while (i < NUM_BYTES) { 00126 bool byteToBuffer; 00127 byteToBuffer = USART_TXBuffer_PutByte(&USART_data, sendArray[i]); 00128 if(byteToBuffer){ 00129 i++; 00130 } 00131 } 00132 00133 /* Fetch received data as it is received. */ 00134 i = 0; 00135 while (i < NUM_BYTES) { 00136 if (USART_RXBufferData_Available(&USART_data)) { 00137 receiveArray[i] = USART_RXBuffer_GetByte(&USART_data); 00138 i++; 00139 } 00140 } 00141 00142 /* Test to see if sent data equals received data. */ 00143 /* Assume success first.*/ 00144 success = true; 00145 for(i = 0; i < NUM_BYTES; i++) { 00146 /* Check that each element is received correctly. */ 00147 if (receiveArray[i] != sendArray[i]) { 00148 success = false; 00149 } 00150 } 00151 00152 /* If success the program ends up inside the if statement.*/ 00153 if(success){ 00154 while(true); 00155 }else{ 00156 while(true); 00157 } 00158 } 00159 00160 00167 ISR(USARTC0_RXC_vect) 00168 { 00169 USART_RXComplete(&USART_data); 00170 } 00171 00172 00179 ISR(USARTC0_DRE_vect) 00180 { 00181 USART_DataRegEmpty(&USART_data); 00182 } @DOC_TITLE@ Generated on Wed Nov 5 10:23:27 2008 for AVRxxxx Application note title by 1.5.5