def disp_spi_send(self, data, dma=False):
if len(data) == 0: return # no need to send anything
self.trans.length = len(
data) * 8 # Length is in bytes, transaction length is in bits.
self.trans.tx_buffer = data
if dma:
self.trans.user = self.spi_callbacks
esp.spi_device_queue_trans(self.spi, self.trans, -1)
else:
self.trans.user = None
esp.spi_device_polling_transmit(self.spi, self.trans)
def do_cmds(self):
trans = esp.spi_transaction_t({
"length": self.buflen * 8,
"tx_buffer": self.txbuf,
"rx_buffer": self.rxbuf
})
rxbuf = self.rxbuf.__dereference__(self.buflen)
res = esp.spi_device_polling_transmit(self.spi, trans)
# print("got:", res, ["%02x"%v for v in rxbuf])
vals = [(rxbuf[1 + 2 * i] << 5) | (rxbuf[2 + 2 * i] >> 3)
for i in range(self.buflen // 2)]
# print("res:", res, "vals:", vals)
res = [(vals[c * REP + REP - 2] + vals[c * REP + REP - 1]) // 2
for c in range(len(self.CMDS))]
return res
def spi_send(self, data):
self.trans.length = len(
data) * 8 # Length is in bytes, transaction length is in bits.
self.trans.tx_buffer = data # data should be allocated as DMA-able memory
self.trans.user = None
esp.spi_device_polling_transmit(self.spi, self.trans)
