zs_read
csr = zs_read(dev, ZS_CSR);
csr = zs_read(dev, ZS_CSR);
data = zs_read(dev, ZS_DATA);
csr = zs_read(dev, ZS_CSR);
data = zs_read(dev, ZS_DATA);
static uint8_t zs_read(void *, uint8_t);
#define ZS_READ(c, r) zs_read(c, r)