| 0,0 → 1,197 |
|---|
| #include "defines.h" |
| #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 |
| RPINR22 = PPS_SPI2_CLK_IN; // SPI2 CLK Input |
| PPS_SPI2_CLK_OUT = 11; // SPI2 CLK Output |
| |
| #ifndef SPI2_WRITE_ONLY |
| RPINR21 = PPS_SPI2_MISO; // SPI2 Data Input |
| SPI_MISO_TRIS = 1; // SPI2 data in pin (MISO) |
| #endif |
| |
| SPI_CLK_TRIS = 0; // SPI2 clock pin |
| PPS_SPI2_MOSI = 10; // SPI2 Data Output (MOSI) |
| SPI_MOSI_TRIS = 0; // SPI2 data out pin (MOSI) |
| |
| 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; |
| |
| 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 |
| |
| SSP2CON1bits.SSPM = speed; |
| |
| SSP2CON1bits.CKP = 1; // Idle state for clock is a high level |
| SSP2CON1bits.SSPEN = 1; // Enable MSSP module |
| |
| #ifdef SPI2_USE_INTERRUPT |
| PIE3bits.SSP2IE = 1; // Enable MSSP2 interrupt |
| #else |
| PIE3bits.SSP2IE = 0; |
| #endif |
| |
| #ifndef SPI2_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 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); |
| |
| #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 |
| } |
| |
| void SPI2_Write_Repeat(unsigned char c, unsigned int length) { |
| #ifdef SPI2_USE_INTERRUPT |
| // TODO Implement interrupts for SPI2 |
| #else |
| unsigned int i = 0; |
| unsigned char tmp = 0; |
| SPI_SLAVE_SELECT_LAT = 0; |
| while (i != length) { |
| SSP2BUF = c; |
| i++; |
| while (!SSP2STATbits.BF); |
| |
| #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 |
| } |
| |
| #ifndef SPI2_WRITE_ONLY |
| void SPI2_Recv_Interrupt_Handler() { |
| unsigned char c; |
| |
| 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++; |
| |
| // 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; |
| } |
| } |
| } |
| } |
| |
| 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; |
| |
| for (i = 0; i < length; i++) { |
| SSP2BUF = 0x0; |
| while (!SSP2STATbits.BF); |
| |
| 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 |
| } |
| |
| unsigned char SPI2_Buffer_Len() { |
| return spi_data_p->buffer_in_len; |
| } |
| |
| 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; |
| } |
| #endif |