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Ignore whitespace Rev 123 → Rev 128

/PIC Stuff/PIC_27J13/spi.c
2,6 → 2,7
#include "spi.h"
 
static SPI_DATA spi_data;
static SPI_DATA *spi_data_p = &spi_data;
 
void SPI2_Init(unsigned char speed) {
// Set up SPI2 with specified pins
49,11 → 50,11
PIE3bits.SSP2IE = 0;
#endif
 
spi_data.buffer_in_len = 0;
spi_data.buffer_in_read_ind = 0;
spi_data.buffer_in_write_ind = 0;
spi_data.buffer_out_ind = 0;
spi_data.buffer_out_len = 0;
spi_data_p->buffer_in_len = 0;
spi_data_p->buffer_in_read_ind = 0;
spi_data_p->buffer_in_write_ind = 0;
spi_data_p->buffer_out_ind = 0;
spi_data_p->buffer_out_len = 0;
}
 
void SPI2_Recv_Interrupt_Handler() {
60,27 → 61,27
unsigned char c;
 
if (SSP2STATbits.BF) { // Check if data receive flag is set
if (spi_data.buffer_in_len == MAXSPIBUF - 1) {
if (spi_data_p->buffer_in_len == MAXSPIBUF - 1) {
DBG_PRINT_SPI("SPI2: (ERROR) buffer overflow\r\n");
c = SSP2BUF; // Read SSP2BUF to clear it
} else {
// Save received data into buffer
spi_data.buffer_in[spi_data.buffer_in_write_ind] = SSP2BUF;
if (spi_data.buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data.buffer_in_write_ind = 0;
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data_p->buffer_in_write_ind = 0;
} else {
spi_data.buffer_in_write_ind++;
spi_data_p->buffer_in_write_ind++;
}
spi_data.buffer_in_len++;
spi_data_p->buffer_in_len++;
 
// Put next byte in SSP2BUF for transmit
if (spi_data.buffer_out_ind != spi_data.buffer_out_len) {
SSP2BUF = spi_data.buffer_out[spi_data.buffer_out_ind];
spi_data.buffer_out_ind++;
if (spi_data_p->buffer_out_ind != spi_data_p->buffer_out_len) {
SSP2BUF = spi_data_p->buffer_out[spi_data_p->buffer_out_ind];
spi_data_p->buffer_out_ind++;
} else {
LATBbits.LATB2 = 1; // Bring SS line high
spi_data.buffer_out_ind = 0;
spi_data.buffer_out_len = 0;
spi_data_p->buffer_out_ind = 0;
spi_data_p->buffer_out_len = 0;
}
}
}
89,13 → 90,13
void SPI2_Write(unsigned char *msg, unsigned int length) {
#ifdef SPI2_USE_INTERRUPT
unsigned char i;
spi_data.buffer_out_len = length;
spi_data.buffer_out_ind = 1;
spi_data_p->buffer_out_len = length;
spi_data_p->buffer_out_ind = 1;
for (i = 0; i < length; i++) {
spi_data.buffer_out[i] = msg[i];
spi_data_p->buffer_out[i] = msg[i];
}
LATBbits.LATB7 = 0; // Bring SS line low
SSP2BUF = spi_data.buffer_out[0]; // Transmit first byte
SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte
#else
unsigned int i = 0;
unsigned char tmp = 0;
106,13 → 107,13
while (!SSP2STATbits.BF);
 
#ifndef SPI2_WRITE_ONLY
spi_data.buffer_in[spi_data.buffer_in_write_ind] = SSP2BUF;
if (spi_data.buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data.buffer_in_write_ind = 0;
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data_p->buffer_in_write_ind = 0;
} else {
spi_data.buffer_in_write_ind++;
spi_data_p->buffer_in_write_ind++;
}
spi_data.buffer_in_len++;
spi_data_p->buffer_in_len++;
#else
// Read data in buffer to clear it
tmp = SSP2BUF;
135,13 → 136,13
while (!SSP2STATbits.BF);
 
#ifndef SPI2_WRITE_ONLY
spi_data.buffer_in[spi_data.buffer_in_write_ind] = SSP2BUF;
if (spi_data.buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data.buffer_in_write_ind = 0;
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data_p->buffer_in_write_ind = 0;
} else {
spi_data.buffer_in_write_ind++;
spi_data_p->buffer_in_write_ind++;
}
spi_data.buffer_in_len++;
spi_data_p->buffer_in_len++;
#else
// Read data in buffer to clear it
tmp = SSP2BUF;
154,13 → 155,13
void SPI2_Read(unsigned char length) {
#ifdef SPI2_USE_INTERRUPT
unsigned char i;
spi_data.buffer_out_len = length;
spi_data.buffer_out_ind = 1;
spi_data_p->buffer_out_len = length;
spi_data_p->buffer_out_ind = 1;
for (i = 0; i < length; i++) {
spi_data.buffer_out[i] = 0x0;
spi_data_p->buffer_out[i] = 0x0;
}
LATBbits.LATB7 = 0; // Bring SS line low
SSP2BUF = spi_data.buffer_out[0]; // Transmit first byte
SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte
#else
unsigned char i = 0;
LATBbits.LATB7 = 0;
169,13 → 170,13
SSP2BUF = 0x0;
while (!SSP2STATbits.BF);
 
spi_data.buffer_in[spi_data.buffer_in_write_ind] = SSP2BUF;
if (spi_data.buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data.buffer_in_write_ind = 0;
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
spi_data_p->buffer_in_write_ind = 0;
} else {
spi_data.buffer_in_write_ind++;
spi_data_p->buffer_in_write_ind++;
}
spi_data.buffer_in_len++;
spi_data_p->buffer_in_len++;
}
LATBbits.LATB7 = 1;
#endif
182,20 → 183,20
}
 
unsigned char SPI2_Buffer_Len() {
return spi_data.buffer_in_len;
return spi_data_p->buffer_in_len;
}
 
unsigned char SPI2_Buffer_Read(unsigned char* buffer) {
unsigned char i = 0;
while (spi_data.buffer_in_len != 0) {
buffer[i] = spi_data.buffer_in[spi_data.buffer_in_read_ind];
while (spi_data_p->buffer_in_len != 0) {
buffer[i] = spi_data_p->buffer_in[spi_data_p->buffer_in_read_ind];
i++;
if (spi_data.buffer_in_read_ind == MAXSPIBUF - 1) {
spi_data.buffer_in_read_ind = 0;
if (spi_data_p->buffer_in_read_ind == MAXSPIBUF - 1) {
spi_data_p->buffer_in_read_ind = 0;
} else {
spi_data.buffer_in_read_ind++;
spi_data_p->buffer_in_read_ind++;
}
spi_data.buffer_in_len--;
spi_data_p->buffer_in_len--;
}
return i;
}