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/*
* Copyright 2020 Birte Kristina Friesel
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "driver/spi.h"
#include <msp430.h>
#ifndef F_I2C
#define F_I2C 1000000UL
#endif
void SPI::setup()
{
UCB1CTLW0 |= UCSWRST;
/* UCB1CLK Pin 5.2 */
P5SEL1 &= ~BIT2;
P5SEL0 |= BIT2;
P5DIR |= BIT2;
/* UCB1SIMO Pin 5.0 */
P5SEL1 &= ~BIT0;
P5SEL0 |= BIT0;
P5DIR |= BIT0;
/* UCB1SOMI Pin 5.1 */
P5SEL1 &= ~BIT1;
P5SEL0 |= BIT1;
P5DIR &= ~BIT1;
//P1REN |= BIT6;
UCB1CTLW0 = UCCKPH | UCMSB | UCMST | UCSYNC | UCMODE_0 | UCSSEL__SMCLK | UCSWRST;
UCB1BRW = (F_CPU/F_I2C)-1; // /16 -> 1MHz
// UCB1BRW = (F_CPU / F_I2C) - 1
UCB1CTLW0 &= ~UCSWRST;
}
static inline unsigned char clean_rxbuf()
{
return UCB1RXBUF;
}
signed char SPI::xmit(unsigned int tx_len, unsigned char *tx_buf,
unsigned int rx_len, unsigned char *rx_buf)
{
if (tx_len < 1) {
return -1;
}
while (UCB1STATW & UCBUSY) ;
if (!(UCB1IFG & UCTXIFG)) {
return -1;
}
UCB1IFG &= ~UCRXIFG;
UCB1TXBUF = tx_buf[0];
unsigned int tx_pos = 1;
unsigned int rx_pos = 0;
while (tx_pos < tx_len || rx_pos < rx_len) {
if ((tx_pos < tx_len) && (UCB1IFG & UCTXIFG)) {
UCB1TXBUF = tx_buf[tx_pos++];
}
if (UCB1IFG & UCRXIFG) {
if (rx_pos < rx_len) {
rx_buf[rx_pos] = UCB1RXBUF;
} else {
UCB1IFG &= ~UCRXIFG;
}
rx_pos++;
}
}
while (UCB1STATW & UCBUSY) ;
return 0;
}
SPI spi;
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