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i2s: adds i2s_rxtxdrive_begin(enableRx, enableTx, driveRxClocks, driveTxClocks) (#7748)

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Two parameters are added to allow using only i2s-in/out-data pin.
This is necessary when i2so-bck and i2so-ws are repurposed
especially because they overlap with SPI GPIO.
This commit is contained in:
david gauchard
2020-12-12 01:41:30 +01:00
committed by GitHub
parent e76a98d335
commit 1e016a4237
2 changed files with 28 additions and 10 deletions
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35
cores/esp8266/core_esp8266_i2s.cpp
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@ -64,6 +64,7 @@ typedef struct i2s_state {
// Callback function should be defined as 'void ICACHE_RAM_ATTR function_name()',
// and be placed in IRAM for faster execution. Avoid long computational tasks in this
// function, use it to set flags and process later.
bool driveClocks;
} i2s_state_t;
// RX = I2S receive (i.e. microphone), TX = I2S transmit (i.e. DAC)
@ -493,6 +494,10 @@ float i2s_get_real_rate(){
}
bool i2s_rxtx_begin(bool enableRx, bool enableTx) {
return i2s_rxtxdrive_begin(enableRx, enableTx, true, true);
}
bool i2s_rxtxdrive_begin(bool enableRx, bool enableTx, bool driveRxClocks, bool driveTxClocks) {
if (tx || rx) {
i2s_end(); // Stop and free any ongoing stuff
}
@ -503,9 +508,12 @@ bool i2s_rxtx_begin(bool enableRx, bool enableTx) {
// Nothing to clean up yet
return false; // OOM Error!
}
pinMode(I2SO_WS, FUNCTION_1);
tx->driveClocks = driveTxClocks;
pinMode(I2SO_DATA, FUNCTION_1);
pinMode(I2SO_BCK, FUNCTION_1);
if (driveTxClocks) {
pinMode(I2SO_WS, FUNCTION_1);
pinMode(I2SO_BCK, FUNCTION_1);
}
}
if (enableRx) {
rx = (i2s_state_t*)calloc(1, sizeof(*rx));
@ -513,12 +521,15 @@ bool i2s_rxtx_begin(bool enableRx, bool enableTx) {
i2s_end(); // Clean up any TX or pin changes
return false; // OOM error!
}
pinMode(I2SI_WS, OUTPUT);
pinMode(I2SI_BCK, OUTPUT);
rx->driveClocks = driveRxClocks;
pinMode(I2SI_DATA, INPUT);
if (driveRxClocks) {
pinMode(I2SI_WS, OUTPUT);
pinMode(I2SI_BCK, OUTPUT);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_I2SI_BCK);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, FUNC_I2SI_WS);
}
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTDI_U, FUNC_I2SI_DATA);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTCK_U, FUNC_I2SI_BCK);
PIN_FUNC_SELECT(PERIPHS_IO_MUX_MTMS_U, FUNC_I2SI_WS);
}
if (!i2s_slc_begin()) {
@ -579,15 +590,19 @@ void i2s_end() {
if (tx) {
pinMode(I2SO_DATA, INPUT);
pinMode(I2SO_BCK, INPUT);
pinMode(I2SO_WS, INPUT);
if (tx->driveClocks) {
pinMode(I2SO_BCK, INPUT);
pinMode(I2SO_WS, INPUT);
}
free(tx);
tx = NULL;
}
if (rx) {
pinMode(I2SI_DATA, INPUT);
pinMode(I2SI_BCK, INPUT);
pinMode(I2SI_WS, INPUT);
if (rx->driveClocks) {
pinMode(I2SI_BCK, INPUT);
pinMode(I2SI_WS, INPUT);
}
free(rx);
rx = NULL;
}