| 5,14 → 5,11 |
|---|
| |
| static SPI1_DATA *spi_data_ptr; |
| |
| void SPI1_Init(SPI1_DATA *data) { |
| void SPI1_Init(SPI1_DATA *data, void (*rx_callback)(char)) { |
| spi_data_ptr = data; |
| spi_data_ptr->outBufferInd = 0; |
| spi_data_ptr->outBufferLen = 0; |
| #ifndef SPI1_WRITE_ONLY |
| spi_data_ptr->inBufferInd = 0; |
| spi_data_ptr->inBufferLen = 0; |
| #endif |
| spi_data_ptr->buffer_out_ind = 0; |
| spi_data_ptr->buffer_out_len = 0; |
| spi_data_ptr->rx_callback = rx_callback; |
| |
| INTDisableInterrupts(); |
| |
| 38,7 → 35,7 |
|---|
| IPC5SET = 0x19000000; // Set IPL=6, Subpriority 1 |
| SPI1BRG = 0x1; // Use FPB/4 clock frequency |
| SPI1STATCLR = 0x40; // Clear the Overflow |
| #ifndef SPI1_WRITE_ONLY |
| #ifndef SPI_WRITE_ONLY |
| IEC0SET = 0x01800000; // Enable RX and Error interrupts |
| #endif |
| // Enhanced buffer, SPI on, 8 bits transfer, SMP=1, Master mode |
| 48,45 → 45,20 |
|---|
| INTEnableInterrupts(); |
| } |
| |
| #ifndef SPI1_WRITE_ONLY |
| int SPI1_Read_Buffer(unsigned char *array, unsigned int count) { |
| if (count > SPI1_BUFFER_SIZE) |
| return 0; |
| if (spi_data_ptr->inBufferLen == 0) |
| return 0; |
| int SPI1_Write(unsigned char *array, unsigned int count, void (*tx_callback)(void)) { |
| spi_data_ptr->tx_callback = tx_callback; |
| |
| // Save previous interrupt state |
| int prev = IEC0 & 0x03800000; |
| // Temporarily disable interrupts |
| IEC0CLR = 0x03800000; |
| int ret = spi_data_ptr->inBufferLen; |
| int i; |
| for (i = 0; i < count; i++) { |
| array[i] = spi_data_ptr->inBuffer[i]; |
| } |
| // Reset buffer pointers |
| spi_data_ptr->inBufferInd = 0; |
| spi_data_ptr->inBufferLen = 0; |
| // Restore saved interrupt state |
| IEC0SET = prev; |
| // Return the number of valid bytes in the buffer |
| return ret; |
| } |
| #endif |
| |
| int SPI1_Write(unsigned char *array, unsigned int count, void (*callback)(void)) { |
| spi_data_ptr->callback_function = callback; |
| |
| if (count > SPI1_BUFFER_SIZE) |
| return 0; |
| if (spi_data_ptr->outBufferLen != 0) |
| if (spi_data_ptr->buffer_out_len != 0) |
| return 0; |
| |
| spi_data_ptr->outBufferLen = count; |
| spi_data_ptr->outBufferInd = count-1; |
| // Put the data to send into the outbound buffer |
| spi_data_ptr->buffer_out_len = count; |
| spi_data_ptr->buffer_out_ind = count-1; |
| int i; |
| for (i = 0; i < count; i++) { |
| spi_data_ptr->outBuffer[i] = array[i]; |
| spi_data_ptr->buffer_out[i] = array[i]; |
| } |
| IEC0SET = 0x02000000; // Enable TX interrupt |
| return 1; |
| 93,7 → 65,7 |
|---|
| } |
| |
| void __ISR(_SPI_1_VECTOR, ipl6) __SPI_1_Interrupt_Handler(void) { |
| #ifndef SPI1_WRITE_ONLY |
| #ifndef SPI_WRITE_ONLY |
| // Process SPI1 error flag |
| if (IFS0bits.SPI1EIF) { |
| // Clear the receive overflow bit if it is set |
| 108,17 → 80,11 |
|---|
| int i; |
| // Read the data received from the last transfer |
| int rxBufferCount = SPI1STATbits.RXBUFELM; |
| if (spi_data_ptr->inBufferLen + rxBufferCount < SPI1_BUFFER_SIZE) { |
| for (i = 0; i < rxBufferCount; i++) { |
| spi_data_ptr->inBuffer[spi_data_ptr->inBufferInd] = SPI1BUF; |
| spi_data_ptr->inBufferInd++; |
| spi_data_ptr->inBufferLen++; |
| } |
| } else { |
| // If buffer is full, discard data in enhanced buffer |
| for (i = 0; i < rxBufferCount; i++) { |
| int tmp = SPI1BUF; |
| } |
| for (i = 0; i < rxBufferCount; i++) { |
| char c = SPI1BUF; |
| // Call the RX callback function on the received data |
| if (spi_data_ptr->rx_callback != NULL) |
| (*spi_data_ptr->rx_callback)(c); |
| } |
| IFS0CLR = 0x01000000; // Clear the RX flag |
| } |
| 128,25 → 94,25 |
|---|
| if (IFS0bits.SPI1TXIF) { |
| int i; |
| // Disable the transmit interrupt if all data has been sent |
| if (spi_data_ptr->outBufferLen == 0) { |
| if (spi_data_ptr->buffer_out_len == 0) { |
| IEC0CLR=0x02000000; |
| if (spi_data_ptr->callback_function != NULL) |
| (*spi_data_ptr->callback_function)(); |
| if (spi_data_ptr->tx_callback != NULL) |
| (*spi_data_ptr->tx_callback)(); |
| } else { |
| // Start transmitting the data in the buffer |
| int txBufferFree = 16 - SPI1STATbits.TXBUFELM; |
| if (spi_data_ptr->outBufferLen > txBufferFree) { |
| if (spi_data_ptr->buffer_out_len > txBufferFree) { |
| for (i = 0; i < txBufferFree; i++) { |
| SPI1BUF = spi_data_ptr->outBuffer[spi_data_ptr->outBufferInd]; |
| spi_data_ptr->outBufferInd--; |
| SPI1BUF = spi_data_ptr->buffer_out[spi_data_ptr->buffer_out_ind]; |
| spi_data_ptr->buffer_out_ind--; |
| } |
| spi_data_ptr->outBufferLen -= txBufferFree; |
| spi_data_ptr->buffer_out_len -= txBufferFree; |
| } else { |
| for (i = 0; i < spi_data_ptr->outBufferLen; i++) { |
| SPI1BUF = spi_data_ptr->outBuffer[spi_data_ptr->outBufferInd]; |
| spi_data_ptr->outBufferInd--; |
| for (i = 0; i < spi_data_ptr->buffer_out_len; i++) { |
| SPI1BUF = spi_data_ptr->buffer_out[spi_data_ptr->buffer_out_ind]; |
| spi_data_ptr->buffer_out_ind--; |
| } |
| spi_data_ptr->outBufferLen = 0; |
| spi_data_ptr->buffer_out_len = 0; |
| } |
| } |
| IFS0CLR = 0x02000000; // Clear the TX flag |