0,0 → 1,159 |
#include "defines.h" |
#include "SPI.h" |
|
static SPI_DATA *spi_data_p; |
|
void SPI_Init(SPI_DATA *data, uint8_t speed) { |
spi_data_p = data; |
|
SPI_MOSI_TRIS = 0; |
SPI_CLK_TRIS = 0; |
|
#ifndef SPI_WRITE_ONLY |
SPI_MISO_TRIS = 1; |
#endif |
|
// SPI_SLAVE_SELECT_TRIS = 0; // SPI2 slave select |
// SPI_SLAVE_SELECT_LAT = 1; // SPI2 SS high (Idle) |
|
// SPI_RESET_TRIS = 0; // SPI2 reset |
// SPI_RESET_LAT = 1; // SPI2 reset active low |
|
SPI_DC_SELECT_TRIS = 0; // SPI2 D/C select |
SPI_DC_SELECT_LAT = 0; |
|
SSP1STATbits.SMP = 0; // Input is sampled in the middle of data output time |
SSP1STATbits.CKE = 0; // Transmit occurs on transition from Idle to active clock state |
|
SSP1CON1bits.SSPM = speed; |
|
SSP1CON1bits.CKP = 1; // Idle state for clock is a high level |
SSP1CON1bits.SSPEN = 1; // Enable MSSP module |
|
PIE1bits.SSP1IE = 0; // Disable MSSP interrupt |
|
#ifndef SPI_WRITE_ONLY |
spi_data_p->buffer_in_len = 0; |
spi_data_p->buffer_in_read_ind = 0; |
spi_data_p->buffer_in_write_ind = 0; |
#endif |
spi_data_p->buffer_out_ind = 0; |
spi_data_p->buffer_out_len = 0; |
} |
|
void SPI_Write(uint8_t *msg, uint16_t length) { |
uint16_t i = 0; |
|
// SPI_SLAVE_SELECT_LAT = 0; |
while (i != length) { |
SSP1BUF = msg[i]; |
i++; |
while (!SSP1STATbits.BF); |
|
#ifndef SPI_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 |
uint8_t tmp = SSP1BUF; |
#endif |
} |
// SPI_SLAVE_SELECT_LAT = 1; |
} |
|
void SPI2_Write_Repeat(uint8_t c, uint16_t length) { |
uint16_t i = 0; |
// SPI_SLAVE_SELECT_LAT = 0; |
while (i != length) { |
SSP1BUF = c; |
i++; |
while (!SSP1STATbits.BF); |
|
#ifndef SPI_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 |
uint8_t tmp = SSP1BUF; |
#endif |
} |
// SPI_SLAVE_SELECT_LAT = 1; |
} |
|
#ifndef SPI_WRITE_ONLY |
void SPI_Recv_Interrupt_Handler() { |
uint8_t c; |
|
if (SSP1STATbits.BF) { // Check if data receive flag is set |
if (spi_data_p->buffer_in_len == MAX_SPI_BUFFER - 1) { |
c = SSP1BUF; // Read SSP2BUF to clear it |
} else { |
// Save received data into buffer |
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP1BUF; |
if (spi_data_p->buffer_in_write_ind == MAX_SPI_BUFFER - 1) { |
spi_data_p->buffer_in_write_ind = 0; |
} else { |
spi_data_p->buffer_in_write_ind++; |
} |
spi_data_p->buffer_in_len++; |
|
// Put next byte in SSP2BUF for transmit |
if (spi_data_p->buffer_out_ind != spi_data_p->buffer_out_len) { |
SSP1BUF = 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; |
} |
} |
} |
} |
|
void SPI_Read(char length) { |
// SPI_SLAVE_SELECT_LAT = 0; |
|
for (uint8_t i = 0; i < length; i++) { |
SSP1BUF = 0x0; |
while (!SSP1STATbits.BF); |
|
spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP1BUF; |
if (spi_data_p->buffer_in_write_ind == MAX_SPI_BUFFER - 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; |
} |
|
uint8_t SPI_Buffer_Len() { |
return spi_data_p->buffer_in_len; |
} |
|
uint8_t SPI_Read_Buffer(uint8_t* buffer) { |
uint8_t 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 == MAX_SPI_BUFFER - 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; |
} |
#endif |