Mplab C30 Compiler Exclusive Online

// Example: MAC with saturation inline int mac_saturate(int acc, int a, int b) acc += a * b; if (acc > 32767) acc = 32767; if (acc < -32768) acc = -32768; return acc;

cb->buffer[cb->head] = data; cb->head = next_head; return 0;

int main() init_uart_buffer(); unsigned char ch; while (1) if (c30_cbuf_get(&uart_rx, &ch) == 0) // process byte mplab c30 compiler

IFS0bits.U1RXIF = 0;

// ------------------------------------------------------------ // 1. SAFE BANKING MACROS (avoid manual BANKED/FAR typos) // ------------------------------------------------------------ #define BANKED_NEAR ((near)) // Accessible without PSV #define BANKED_FAR attribute ((far)) // Any RAM, slower access #define Y_DATA_SPACE attribute ((space(ymemory))) // For DSP #define AUTO_PSV attribute ((space(auto_psv))) // const in program memory // Example: MAC with saturation inline int mac_saturate(int

// ------------------------------------------------------------ // 2. CIRCULAR BUFFER (with DMA/DSP-friendly alignment) // ------------------------------------------------------------ typedef struct volatile unsigned int head; volatile unsigned int tail; unsigned int mask; // size-1, must be power of two unsigned char Y_DATA_SPACE *buffer; // force Y-space for DSP unsigned int len; c30_cbuf_t;

// ------------------------------------------------------------ // 4. DSP FIXED-POINT UTILITY (C30 lacks saturating arithmetic) // ------------------------------------------------------------ #define Q15(x) ((int)((x) * 32768.0)) #define SATURATE_Q15(x) ( (x) > 32767 ? 32767 : ( (x) < -32768 ? -32768 : (x) ) ) DSP FIXED-POINT UTILITY (C30 lacks saturating arithmetic) //

#endif // C30_UTILS_H #include "c30_utils.h" // Force buffer into Y data space for faster DSP-style UART processing unsigned char Y_DATA_SPACE uart_rx_buf[64]; // 64 bytes, must be power of two c30_cbuf_t uart_rx;