Bp1048b2 | Programming

The Bp1048b2 has a 3-stage write buffer. Writes to peripheral registers may not be complete before the next instruction. Fix: Insert BP_DSB() (Data Synchronization Barrier) after configuring critical peripherals.

After flashing, remove BOOT HIGH and reset the chip. Firmware runs.

The BP1048B2 is a linear, constant-current LED driver with the following key features: Bp1048b2 Programming

⚠️ The BP1048B2 is not a microcontroller. “Programming” here refers to configuring its operating parameters (current, dimming) via external passive components and control signals.

The Bp1048b2 pipeline stalls on memory aliasing. Always use the restrict keyword: The Bp1048b2 has a 3-stage write buffer

void vector_add(int *restrict a, int *restrict b, int *restrict c, int n) 
    for(int i = 0; i < n; i++) c[i] = a[i] + b[i];

__bp_bank(2) int16_t voice_out[12][64];
__bp_bank(2) int16_t final_mix[64];
void mix_voices(void) 
for(int sample = 0; sample < 64; sample += 4) 
bp_vec4_s16 sum = 0,0,0,0;
for(int v = 0; v < 12; v++) 
bp_vec4_s16 vdata = bp_vec_load(&voice_out[v][sample]);
sum = bp_vec_add(sum, vdata);
bp_vec_store(&final_mix[sample], sum);

This implementation uses 78% fewer cycles than a naive C loop.