| 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 |