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147 Kevin 1 
#include "defines.h"
121 Kevin 2 
#include "spi.h"
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static SPI_DATA spi_data;
128 Kevin 5 
static SPI_DATA *spi_data_p = &spi_data;
121 Kevin 6 
 
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void SPI2_Init(unsigned char speed) {
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    // Set up SPI2 with specified pins
147 Kevin 9 
    RPINR22 = PPS_SPI2_CLK_IN; // SPI2 CLK Input
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    PPS_SPI2_CLK_OUT = 11; // SPI2 CLK Output
121 Kevin 11 
 
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#ifndef SPI2_WRITE_ONLY
147 Kevin 13 
    RPINR21 = PPS_SPI2_MISO; // SPI2 Data Input
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    SPI_MISO_TRIS = 1; // SPI2 data in pin (MISO)
121 Kevin 15 
#endif
147 Kevin 16 
 
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    SPI_CLK_TRIS = 0; // SPI2 clock pin
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    PPS_SPI2_MOSI = 10; // SPI2 Data Output (MOSI)
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    SPI_MOSI_TRIS = 0; // SPI2 data out pin (MOSI)
121 Kevin 20 
 
147 Kevin 21 
    SPI_SLAVE_SELECT_TRIS = 0; // SPI2 slave select
129 Kevin 22 
    SPI_SLAVE_SELECT_LAT = 1; // SPI2 SS high (Idle)
121 Kevin 23 
 
147 Kevin 24 
    SPI_RESET_TRIS = 0; // SPI2 reset
129 Kevin 25 
    SPI_RESET_LAT = 1; // SPI2 reset active low
121 Kevin 26 
 
147 Kevin 27 
    SPI_DC_SELECT_TRIS = 0; // SPI2 D/C select
129 Kevin 28 
    SPI_DC_SELECT_LAT = 0;
121 Kevin 29 
 
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    SSP2STATbits.SMP = 0; // Input is sampled in the middle of data output time
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    SSP2STATbits.CKE = 0; // Transmit occurs on transition from Idle to active clock state
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123 Kevin 33 
    SSP2CON1bits.SSPM = speed;
121 Kevin 34 
 
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    SSP2CON1bits.CKP = 1; // Idle state for clock is a high level
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    SSP2CON1bits.SSPEN = 1; // Enable MSSP module
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#ifdef SPI2_USE_INTERRUPT
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    PIE3bits.SSP2IE = 1; // Enable MSSP2 interrupt
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#else
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    PIE3bits.SSP2IE = 0;
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#endif
43 
 
147 Kevin 44 
#ifndef SPI2_WRITE_ONLY
128 Kevin 45 
    spi_data_p->buffer_in_len = 0;
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    spi_data_p->buffer_in_read_ind = 0;
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    spi_data_p->buffer_in_write_ind = 0;
147 Kevin 48 
#endif
128 Kevin 49 
    spi_data_p->buffer_out_ind = 0;
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    spi_data_p->buffer_out_len = 0;
121 Kevin 51 
}
52 
 
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void SPI2_Write(unsigned char *msg, unsigned int length) {
54 
#ifdef SPI2_USE_INTERRUPT
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    unsigned char i;
128 Kevin 56 
    spi_data_p->buffer_out_len = length;
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    spi_data_p->buffer_out_ind = 1;
121 Kevin 58 
    for (i = 0; i < length; i++) {
128 Kevin 59 
        spi_data_p->buffer_out[i] = msg[i];
121 Kevin 60 
    }
129 Kevin 61 
    SPI_SLAVE_SELECT_LAT = 0; // Bring SS line low
128 Kevin 62 
    SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte
121 Kevin 63 
#else
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    unsigned int i = 0;
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    unsigned char tmp = 0;
129 Kevin 66 
    SPI_SLAVE_SELECT_LAT = 0;
121 Kevin 67 
    while (i != length) {
68 
        SSP2BUF = msg[i];
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        i++;
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        while (!SSP2STATbits.BF);
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#ifndef SPI2_WRITE_ONLY
128 Kevin 73 
        spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
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        if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
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            spi_data_p->buffer_in_write_ind = 0;
121 Kevin 76 
        } else {
128 Kevin 77 
            spi_data_p->buffer_in_write_ind++;
121 Kevin 78 
        }
128 Kevin 79 
        spi_data_p->buffer_in_len++;
121 Kevin 80 
#else
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        // Read data in buffer to clear it
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        tmp = SSP2BUF;
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#endif
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    }
129 Kevin 85 
    SPI_SLAVE_SELECT_LAT = 1;
121 Kevin 86 
#endif
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}
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void SPI2_Write_Repeat(unsigned char c, unsigned int length) {
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#ifdef SPI2_USE_INTERRUPT
147 Kevin 91 
    // TODO Implement interrupts for SPI2
121 Kevin 92 
#else
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    unsigned int i = 0;
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    unsigned char tmp = 0;
129 Kevin 95 
    SPI_SLAVE_SELECT_LAT = 0;
121 Kevin 96 
    while (i != length) {
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        SSP2BUF = c;
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        i++;
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        while (!SSP2STATbits.BF);
100 
 
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#ifndef SPI2_WRITE_ONLY
128 Kevin 102 
        spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
103 
        if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
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            spi_data_p->buffer_in_write_ind = 0;
121 Kevin 105 
        } else {
128 Kevin 106 
            spi_data_p->buffer_in_write_ind++;
121 Kevin 107 
        }
128 Kevin 108 
        spi_data_p->buffer_in_len++;
121 Kevin 109 
#else
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        // Read data in buffer to clear it
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        tmp = SSP2BUF;
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#endif
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    }
129 Kevin 114 
    SPI_SLAVE_SELECT_LAT = 1;
121 Kevin 115 
#endif
116 
}
117 
 
147 Kevin 118 
#ifndef SPI2_WRITE_ONLY
119 
void SPI2_Recv_Interrupt_Handler() {
120 
    unsigned char c;
121 
 
122 
    if (SSP2STATbits.BF) { // Check if data receive flag is set
123 
        if (spi_data_p->buffer_in_len == MAXSPIBUF - 1) {
124 
            DBG_PRINT_SPI("SPI2: (ERROR) buffer overflow\r\n");
125 
            c = SSP2BUF; // Read SSP2BUF to clear it
126 
        } else {
127 
            // Save received data into buffer
128 
            spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
129 
            if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
130 
                spi_data_p->buffer_in_write_ind = 0;
131 
            } else {
132 
                spi_data_p->buffer_in_write_ind++;
133 
            }
134 
            spi_data_p->buffer_in_len++;
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136 
            // Put next byte in SSP2BUF for transmit
137 
            if (spi_data_p->buffer_out_ind != spi_data_p->buffer_out_len) {
138 
                SSP2BUF = spi_data_p->buffer_out[spi_data_p->buffer_out_ind];
139 
                spi_data_p->buffer_out_ind++;
140 
            } else {
141 
                SPI_SLAVE_SELECT_LAT = 1; // Bring SS line high
142 
                spi_data_p->buffer_out_ind = 0;
143 
                spi_data_p->buffer_out_len = 0;
144 
            }
145 
        }
146 
    }
147 
}
148 
 
121 Kevin 149 
void SPI2_Read(unsigned char length) {
150 
#ifdef SPI2_USE_INTERRUPT
151 
    unsigned char i;
128 Kevin 152 
    spi_data_p->buffer_out_len = length;
153 
    spi_data_p->buffer_out_ind = 1;
121 Kevin 154 
    for (i = 0; i < length; i++) {
128 Kevin 155 
        spi_data_p->buffer_out[i] = 0x0;
121 Kevin 156 
    }
129 Kevin 157 
    SPI_SLAVE_SELECT_LAT = 0; // Bring SS line low
128 Kevin 158 
    SSP2BUF = spi_data_p->buffer_out[0]; // Transmit first byte
121 Kevin 159 
#else
160 
    unsigned char i = 0;
129 Kevin 161 
    SPI_SLAVE_SELECT_LAT = 0;
121 Kevin 162 
 
163 
    for (i = 0; i < length; i++) {
164 
        SSP2BUF = 0x0;
165 
        while (!SSP2STATbits.BF);
166 
 
128 Kevin 167 
        spi_data_p->buffer_in[spi_data_p->buffer_in_write_ind] = SSP2BUF;
168 
        if (spi_data_p->buffer_in_write_ind == MAXSPIBUF - 1) {
169 
            spi_data_p->buffer_in_write_ind = 0;
121 Kevin 170 
        } else {
128 Kevin 171 
            spi_data_p->buffer_in_write_ind++;
121 Kevin 172 
        }
128 Kevin 173 
        spi_data_p->buffer_in_len++;
121 Kevin 174 
    }
129 Kevin 175 
    SPI_SLAVE_SELECT_LAT = 1;
121 Kevin 176 
#endif
177 
}
178 
 
179 
unsigned char SPI2_Buffer_Len() {
128 Kevin 180 
    return spi_data_p->buffer_in_len;
121 Kevin 181 
}
182 
 
183 
unsigned char SPI2_Buffer_Read(unsigned char* buffer) {
184 
    unsigned char i = 0;
128 Kevin 185 
    while (spi_data_p->buffer_in_len != 0) {
186 
        buffer[i] = spi_data_p->buffer_in[spi_data_p->buffer_in_read_ind];
121 Kevin 187 
        i++;
128 Kevin 188 
        if (spi_data_p->buffer_in_read_ind == MAXSPIBUF - 1) {
189 
            spi_data_p->buffer_in_read_ind = 0;
121 Kevin 190 
        } else {
128 Kevin 191 
            spi_data_p->buffer_in_read_ind++;
121 Kevin 192 
        }
128 Kevin 193 
        spi_data_p->buffer_in_len--;
121 Kevin 194 
    }
195 
    return i;
147 Kevin 196 
}
197 
#endif