58 lines
1.2 KiB
C
58 lines
1.2 KiB
C
#include "displayDriver.h"
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#include "led.h"
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#include "canvas.h"
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#include <msp430g2553.h>
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#include <stdlib.h>
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#include <stdint.h>
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inline static void spiSendOctet(uint8_t v) {
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// wait for TX buffer empty
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while (!(UC0IFG & UCB0TXIFG));
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// load octet into TX buffer
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UCB0TXBUF = v;
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}
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void displayDriverTransferCanvas() {
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// wait for signal waiting for data
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while ((P1IN & BIT3) == 0);
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for (uint8_t i = 0; i < canvas.size; i++) {
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if ((*((canvas.canvas)+i) & 0x80) != 0) {
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*((canvas.canvas)+i) &= ~0x80;
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spiSendOctet(i);
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spiSendOctet(*((canvas.canvas)+i));
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}
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}
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spiSendOctet(0xfe);
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}
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void displayDriverInit() {
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// SPI in master mode
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UCB0CTL0 = UCMST;
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// SPI timing config
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UCB0CTL1 = UCSSEL_3;
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// Faster than 8 ends up in strange communication errors
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// between the both MCUs.
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// With 8 the transfer of a complete 110 pixel canvas takes
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// about 720us.
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UCB0BR0 = 8;
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UCB0BR1 = 0;
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// BIT5: UCB0CLK
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// BIT6: UCB0SOMI
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// BIT7: UCB0SIMO
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P1SEL |= BIT5 | BIT6 | BIT7;
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P1SEL2 |= BIT5 | BIT6 | BIT7;
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P1DIR |= BIT5 | BIT7;
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// P1.3 is signal line
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P1DIR &= ~BIT3;
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// enable SPI module
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UCB0CTL1 &= ~UCSWRST;
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}
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