0,0 → 1,194 |
#include "maindefs.h" |
#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 |
RPINR22 = PPS_SPI2_CLK_IN; // SPI2 CLK Input (Pin RB4) |
PPS_SPI2_CLK_OUT = 11; // SPI2 CLK Output (Pin RB4) |
#ifndef SPI2_WRITE_ONLY |
RPINR21 = PPS_SPI2_MISO; // SPI2 Data Input (Pin RB3) |
#endif |
PPS_SPI2_MOSI = 10; // SPI2 Data Output (MOSI) (Pin RB2) |
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SPI_CLK_TRIS = 0; // SPI2 clock pin (Pin RB4) |
#ifndef SPI2_WRITE_ONLY |
SPI_MISO_TRIS = 1; // SPI2 data in pin (Pin RB3)(MISO) |
#endif |
SPI_MOSI_TRIS = 0; // SPI2 data out pin (Pin RB2)(MOSI) |
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SPI_SLAVE_SELECT_TRIS = 0; // SPI2 slave select (Pin RB7) |
SPI_SLAVE_SELECT_LAT = 1; // SPI2 SS high (Idle) |
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SPI_RESET_TRIS = 0; // SPI2 reset (Pin RB6) |
SPI_RESET_LAT = 1; // SPI2 reset active low |
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SPI_DC_SELECT_TRIS = 0; // SPI2 D/C select (Pin RB5) |
SPI_DC_SELECT_LAT = 0; |
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SSP2STATbits.SMP = 0; // Input is sampled in the middle of data output time |
SSP2STATbits.CKE = 0; // Transmit occurs on transition from Idle to active clock state |
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SSP2CON1bits.SSPM = speed; |
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SSP2CON1bits.CKP = 1; // Idle state for clock is a high level |
SSP2CON1bits.SSPEN = 1; // Enable MSSP module |
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#ifdef SPI2_USE_INTERRUPT |
PIE3bits.SSP2IE = 1; // Enable MSSP2 interrupt |
#else |
PIE3bits.SSP2IE = 0; |
#endif |
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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() { |
unsigned char c; |
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if (SSP2STATbits.BF) { // Check if data receive flag is set |
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_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_p->buffer_in_write_ind++; |
} |
spi_data_p->buffer_in_len++; |
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// Put next byte in SSP2BUF for transmit |
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 { |
SPI_SLAVE_SELECT_LAT = 1; // Bring SS line high |
spi_data_p->buffer_out_ind = 0; |
spi_data_p->buffer_out_len = 0; |
} |
} |
} |
} |
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void SPI2_Write(unsigned char *msg, unsigned int length) { |
#ifdef SPI2_USE_INTERRUPT |
unsigned char i; |
spi_data_p->buffer_out_len = length; |
spi_data_p->buffer_out_ind = 1; |
for (i = 0; i < length; i++) { |
spi_data_p->buffer_out[i] = msg[i]; |
} |
SPI_SLAVE_SELECT_LAT = 0; // Bring SS line low |
SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte |
#else |
unsigned int i = 0; |
unsigned char tmp = 0; |
SPI_SLAVE_SELECT_LAT = 0; |
while (i != length) { |
SSP2BUF = msg[i]; |
i++; |
while (!SSP2STATbits.BF); |
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#ifndef SPI2_WRITE_ONLY |
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_p->buffer_in_write_ind++; |
} |
spi_data_p->buffer_in_len++; |
#else |
// Read data in buffer to clear it |
tmp = SSP2BUF; |
#endif |
} |
SPI_SLAVE_SELECT_LAT = 1; |
#endif |
} |
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void SPI2_Write_Repeat(unsigned char c, unsigned int length) { |
#ifdef SPI2_USE_INTERRUPT |
// TODO |
#else |
unsigned int i = 0; |
unsigned char tmp = 0; |
SPI_SLAVE_SELECT_LAT = 0; |
while (i != length) { |
SSP2BUF = c; |
i++; |
while (!SSP2STATbits.BF); |
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#ifndef SPI2_WRITE_ONLY |
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_p->buffer_in_write_ind++; |
} |
spi_data_p->buffer_in_len++; |
#else |
// Read data in buffer to clear it |
tmp = SSP2BUF; |
#endif |
} |
SPI_SLAVE_SELECT_LAT = 1; |
#endif |
} |
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void SPI2_Read(unsigned char length) { |
#ifdef SPI2_USE_INTERRUPT |
unsigned char i; |
spi_data_p->buffer_out_len = length; |
spi_data_p->buffer_out_ind = 1; |
for (i = 0; i < length; i++) { |
spi_data_p->buffer_out[i] = 0x0; |
} |
SPI_SLAVE_SELECT_LAT = 0; // Bring SS line low |
SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte |
#else |
unsigned char i = 0; |
SPI_SLAVE_SELECT_LAT = 0; |
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for (i = 0; i < length; i++) { |
SSP2BUF = 0x0; |
while (!SSP2STATbits.BF); |
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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_p->buffer_in_write_ind++; |
} |
spi_data_p->buffer_in_len++; |
} |
SPI_SLAVE_SELECT_LAT = 1; |
#endif |
} |
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unsigned char SPI2_Buffer_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_p->buffer_in_len != 0) { |
buffer[i] = spi_data_p->buffer_in[spi_data_p->buffer_in_read_ind]; |
i++; |
if (spi_data_p->buffer_in_read_ind == MAXSPIBUF - 1) { |
spi_data_p->buffer_in_read_ind = 0; |
} else { |
spi_data_p->buffer_in_read_ind++; |
} |
spi_data_p->buffer_in_len--; |
} |
return i; |
} |