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/*
* Copyright 2020 Daniel 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()
{
UCB0CTLW0 |= UCSWRST;
/* UCB0CLK Pin 2.2 */
P2SEL0 &= ~BIT2;
P2SEL1 |= BIT2;
P2DIR |= BIT2;
/* UCB0SIMO Pin 1.6 */
P1SEL0 &= ~BIT6;
P1SEL1 |= BIT6;
P1DIR |= BIT6;
/* UCB0SOMI Pin 1.7 */
P1SEL0 &= ~BIT7;
P1SEL1 |= BIT7;
P1DIR &= ~BIT7;
//P1REN |= BIT6;
UCB0CTLW0 = UCCKPH | UCMSB | UCMST | UCSYNC | UCMODE_0 | UCSSEL__SMCLK | UCSWRST;
UCB0BRW = (F_CPU/F_I2C)-1; // /16 -> 1MHz
// UCB0BRW = (F_CPU / F_I2C) - 1
UCB0CTLW0 &= ~UCSWRST;
}
static inline unsigned char clean_rxbuf()
{
return UCB0RXBUF;
}
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 (UCB0STATW & UCBUSY) ;
if (!(UCB0IFG & UCTXIFG)) {
return -1;
}
UCB0IFG &= ~UCRXIFG;
UCB0TXBUF = 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) && (UCB0IFG & UCTXIFG)) {
UCB0TXBUF = tx_buf[tx_pos++];
}
if (UCB0IFG & UCRXIFG) {
if (rx_pos < rx_len) {
rx_buf[rx_pos] = UCB0RXBUF;
} else {
UCB0IFG &= ~UCRXIFG;
}
rx_pos++;
}
}
while (UCB0STATW & UCBUSY) ;
return 0;
}
SPI spi;
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