0,0 → 1,231 |
#include <xc.h> |
#include <stdio.h> |
#include <string.h> |
#include "defines.h" |
#include "base_SPI.h" |
#include "base_UART.h" |
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static SPI_DATA *spi_data_p; |
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void SPI2_Init(SPI_DATA *data, char speed) { |
spi_data_p = data; |
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// Set up SPI2 with specified pins |
RPINR22 = PPS_SPI2_CLK_IN; // SPI2 CLK Input |
PPS_SPI2_CLK_OUT = 11; // SPI2 CLK Output |
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#ifndef SPI2_WRITE_ONLY |
RPINR21 = PPS_SPI2_MISO; // SPI2 Data Input |
SPI_MISO_TRIS = 1; // SPI2 data in pin (MISO) |
#endif |
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SPI_CLK_TRIS = 0; // SPI2 clock pin |
PPS_SPI2_MOSI = 10; // SPI2 Data Output (MOSI) |
SPI_MOSI_TRIS = 0; // SPI2 data out pin (MOSI) |
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SPI_SLAVE_SELECT_TRIS = 0; // SPI2 slave select |
SPI_SLAVE_SELECT_LAT = 1; // SPI2 SS high (Idle) |
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SPI_RESET_TRIS = 0; // SPI2 reset |
SPI_RESET_LAT = 1; // SPI2 reset active low |
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SPI_DC_SELECT_TRIS = 0; // SPI2 D/C select |
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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#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; |
} |
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void SPI2_Write(char *msg, unsigned int length) { |
unsigned int i = 0; |
#ifdef SPI2_USE_INTERRUPT |
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 |
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 |
char tmp = SSP2BUF; |
#endif |
} |
SPI_SLAVE_SELECT_LAT = 1; |
#endif |
} |
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void SPI2_Write_Repeat(char c, unsigned int length) { |
#ifdef SPI2_USE_INTERRUPT |
// TODO Implement interrupts for SPI2 |
#else |
unsigned int i = 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 |
char tmp = SSP2BUF; |
#endif |
} |
SPI_SLAVE_SELECT_LAT = 1; |
#endif |
} |
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void SPI2_DMA_Init(void) { |
DMACON1bits.SSCON0 = 0; |
DMACON1bits.SSCON1 = 0; // DYLINTEN is software programmable |
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DMACON1bits.TXINC = 1; // TXADDR is automatically incremented |
DMACON1bits.RXINC = 0; // RXADDR is not automatically incremented |
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DMACON1bits.DUPLEX0 = 1; |
DMACON1bits.DUPLEX1 = 0; // Half-duplex mode, transmission only |
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DMACON1bits.DLYINTEN = 0; // Interrupt is disabled |
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DMACON2bits.DLYCYC = 0b0000; // Delay time of 1 cycle between bytes |
DMACON2bits.INTLVL = 0b0000; // Interrupt on transfer complete |
} |
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void SPI2_DMA_Start(unsigned int length, void* TXADDR, void* RXADDR) { |
// Set length of message to transmit |
DMABCH = (char)(length-1 >> 8); |
DMABCL = (char)(length-1); |
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// Set sourcing address |
TXADDRH = (char)((int)TXADDR >> 8); |
TXADDRL = (char)((int)TXADDR); |
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// Set receiving address |
RXADDRH = (char)((int)RXADDR >> 8); |
RXADDRL = (char)((int)RXADDR); |
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DMACON1bits.DMAEN = 1; // Start transmission |
} |
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#ifndef SPI2_WRITE_ONLY |
void SPI2_Recv_Interrupt_Handler() { |
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) { |
char output[64]; |
sprintf(output, "SPI2: (ERROR) buffer overflow\r\n"); |
DBG_PRINT_SPI(output, strlen(output)); |
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_Read(char length) { |
#ifdef SPI2_USE_INTERRUPT |
spi_data_p->buffer_out_len = length; |
spi_data_p->buffer_out_ind = 1; |
for (char 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 |
SPI_SLAVE_SELECT_LAT = 0; |
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for (char 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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char SPI2_Buffer_Len() { |
return spi_data_p->buffer_in_len; |
} |
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char SPI2_Read_Buffer(char* buffer) { |
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 |