166 lines
10 KiB
C
166 lines
10 KiB
C
#include "usci.h"
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void usci_init(void){
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usci_A0_init();
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usci_A1_init();
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usci_A2_init();
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usci_A3_init();
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usci_B0_init();
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usci_B1_init();
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usci_B2_init();
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usci_B3_init();
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}
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/*************************************************************************/
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/******************************** USCI A0 ********************************/
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/*************************************************************************/
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void usci_A0_init(void){
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}
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/*************************************************************************/
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/******************************** USCI A1 ********************************/
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/*************************************************************************/
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void usci_A1_init(void){
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}
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/*************************************************************************/
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/******************************** USCI A2 ********************************/
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/*************************************************************************/
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void usci_A2_init(void){
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UCA2CTL1 |= UCSWRST; // Software Reset Enable - Set high, disabling the USCI module; Changes to USCI configuration registers can only be made when the UCSWRST bit = 1
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UCA2CTL0 &= ~UCPEN; // Parity Enable - Disabled
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UCA2CTL0 &= ~UCMSB; // MSB First Select - Set low; Least Significant Bit will be sent first
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UCA2CTL0 &= ~UC7BIT; // Character Length - 8-bit data selected
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UCA2CTL0 &= ~UCSPB; // Stop Bit Select - One stop bit selected
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UCA2CTL0 &= ~UCMODE1; // USCI Mode [2 Bits Required] - UART mode selected
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UCA2CTL0 &= ~UCMODE0; // USCI Mode [2 Bits Required] - UART mode selected
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UCA2CTL0 &= ~UCSYNC; // Synchronous Mode Enable - Asynchronous mode selected
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UCA2CTL1 &= ~0b11000000; // Reset both UCSSELx bits so the USCI Clock Source Select bits are more predictable
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UCA2CTL1 |= UCSSEL__SMCLK; // USCI Clock Source Select - SMCLK
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UCA2CTL1 &= ~UCRXEIE; // Receive Erroneous-Character Interrupt Enable - Disabled
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UCA2CTL1 &= ~UCBRKIE; // Receive Break Character Interrupt Enable - Disabled
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UCA2CTL1 &= ~UCDORM; // Dormant - Disabled; USCI module will not be put into sleep mode
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UCA2CTL1 &= ~UCTXADDR; // Transmit Address - Next frame transmitted is data
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UCA2CTL1 &= ~UCTXBRK; // Transmit Break - Do not transmit a Break/Synch as the next frame
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UCA2BRW = 10; // Clock Prescalar
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UCA2MCTL &= ~0b11111111; // Reset entire register
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UCA2MCTL |= 0x0 << 4; // First Modulation Stage Select
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UCA2MCTL |= 0x0 << 1; // Second Modulation Stage Select
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UCA2MCTL |= 0x0; // Oversampling Mode Enable - Disabled
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}
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void usci_A2_enable(void){
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UCA2CTL1 &= ~UCSWRST; // Software Reset Enable - Set low, enabling the USCI module
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}
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void usci_A2_disable(void){
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UCA2CTL1 |= UCSWRST; // Software Reset Enable - Set high, disabling the USCI module
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}
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void usci_A2_enableInterrupt(void){
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UCA2IE |= (UCTXIE | UCRXIE); // Enable transmit and receive interrupts
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}
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void usci_A2_disableInterrupt(void){
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UCA2IE &= ~(UCTXIE | UCRXIE); // Disable transmit and receive interrupts
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}
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void usci_A2_transmitChar(char charToTransmit){
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while((UCA2IFG & UCTXIFG) == 0){ // If the USCI module is not yet ready for the next value to transmit, wait indefinitely
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_NOP(); // Processor will do nothing until loop exits
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}
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UCA2TXBUF = charToTransmit; // When USCI module signals that it is ready, the next character value is moved into the transmit buffer
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}
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char usci_A2_receiveChar(void){
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short i = 100; // Initialize a countdown
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while (((UCA2IFG & UCRXIFG) == 0) && (i > 0)){ // Wait until either the end of the countdown or when the UCA2IFG register signals that the receive buffer is ready
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--i;
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}
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return(UCA2RXBUF); // Return the receive buffer regardless of whether it is ready or not
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}
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int usci_A2_transmitString(char* pString){
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short i = 0; // Initialize a counter of how many characters were transmitted
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char nextChar = *pString; // Load the first character in the string array from the pointer
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while(nextChar != '\0'){ // Unless the next character in the string array is a null terminator, continue sending more characters
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usci_A2_transmitChar(nextChar); // Transmit the next character, as it is not a null terminator
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++i; // Increment the counter
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++pString; // Move the pointer to the next memory location, which is storing the next character in the string array
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nextChar = *pString; // Load the next character from memory
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}
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usci_A2_transmitChar('\n'); // Transmit a "New Line" character
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usci_A2_transmitChar('\r'); // Transmit a "Carriage Return" character
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return(i); // Return the counter of how many characters were transmitted, not including the "New Line" and "Carriage Return" characters
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}
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int usci_A2_receiveString(char* pString){
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short i = 0; // Initialize a counter of how many characters were received
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while(1){ // Continue looping until a "Carriage Return" character is received
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*pString = usci_A2_receiveChar(); // Store the received character in the designated memory location
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if(*pString == '\r'){ // If a "Carriage Return" character is found:
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*pString = '\0'; // Overwrite it with a null terminator
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return(i); // End receiving new characters and return the count of characters received
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}else{ // Else:
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++pString; // Increment the pointer to the next memory location for the next character
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++i; // Increment the counter of received characters
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}
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}
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}
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/*************************************************************************/
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/******************************** USCI A3 ********************************/
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/*************************************************************************/
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void usci_A3_init(void){
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}
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/*************************************************************************/
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/******************************** USCI B0 ********************************/
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/*************************************************************************/
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void usci_B0_init(void){
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}
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/*************************************************************************/
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/******************************** USCI B1 ********************************/
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/*************************************************************************/
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void usci_B1_init(void){
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}
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/*************************************************************************/
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/******************************** USCI B2 ********************************/
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/*************************************************************************/
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void usci_B2_init(void){
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UCB2CTL1 |= UCSWRST; // Software Reset Enable - Set high, disabling the USCI module; Changes to USCI configuration registers can only be made when the UCSWRST bit = 1
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UCB2CTL0 &= ~UCA10; // Use 7-bit addressing mode for itself
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UCB2CTL0 &= ~UCSLA10; // Use 7-bit addressing mode for slaves
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UCB2CTL0 &= ~UCMM; // Single-master environment only
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UCB2CTL0 |= UCMST; // Master mode selected
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UCB2CTL0 |= UCMODE_3; // I2C mode selected for the USCI
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UCB2CTL1 |= UCSSEL__SMCLK; // Use SMCLK as the USCi's clock source
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}
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/*************************************************************************/
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/******************************** USCI B3 ********************************/
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/*************************************************************************/
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void usci_B3_init(void){
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}
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