2,6 → 2,7 |
#include "spi.h" |
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static SPI_DATA spi_data; |
static SPI_DATA *spi_data_p = &spi_data; |
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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; |
} |
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void SPI2_Recv_Interrupt_Handler() { |
60,27 → 61,27 |
unsigned char c; |
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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); |
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#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); |
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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 |
} |
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unsigned char SPI2_Buffer_Len() { |
return spi_data.buffer_in_len; |
return spi_data_p->buffer_in_len; |
} |
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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; |
} |