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examples/spi_master: Fixed SPI read (keeping CS active) in SPI master example

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Closes https://github.com/espressif/esp-idf/issues/8652
This commit is contained in:
Vilem Zavodny 2022-03-29 08:43:16 +02:00
parent c70a69b1dd
commit 29792561ca
1 changed files with 12 additions and 3 deletions
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15
examples/peripherals/spi_master/lcd/main/spi_master_example_main.c
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@ -184,7 +184,7 @@ DRAM_ATTR static const lcd_init_cmd_t ili_init_cmds[]={
* mode for higher speed. The overhead of interrupt transactions is more than
* just waiting for the transaction to complete.
*/
void lcd_cmd(spi_device_handle_t spi, const uint8_t cmd)
void lcd_cmd(spi_device_handle_t spi, const uint8_t cmd, bool keep_cs_active)
{
esp_err_t ret;
spi_transaction_t t;
@ -192,6 +192,9 @@ void lcd_cmd(spi_device_handle_t spi, const uint8_t cmd)
t.length=8; //Command is 8 bits
t.tx_buffer=&cmd; //The data is the cmd itself
t.user=(void*)0; //D/C needs to be set to 0
if (keep_cs_active) {
t.flags = SPI_TRANS_CS_KEEP_ACTIVE; //Keep CS active after data transfer
}
ret=spi_device_polling_transmit(spi, &t); //Transmit!
assert(ret==ESP_OK); //Should have had no issues.
}
@ -226,8 +229,11 @@ void lcd_spi_pre_transfer_callback(spi_transaction_t *t)
uint32_t lcd_get_id(spi_device_handle_t spi)
{
// When using SPI_TRANS_CS_KEEP_ACTIVE, bus must be locked/acquired
spi_device_acquire_bus(spi, portMAX_DELAY);
//get_id cmd
lcd_cmd(spi, 0x04);
lcd_cmd(spi, 0x04, true);
spi_transaction_t t;
memset(&t, 0, sizeof(t));
@ -238,6 +244,9 @@ uint32_t lcd_get_id(spi_device_handle_t spi)
esp_err_t ret = spi_device_polling_transmit(spi, &t);
assert( ret == ESP_OK );
// Release bus
spi_device_release_bus(spi);
return *(uint32_t*)t.rx_data;
}
@ -293,7 +302,7 @@ void lcd_init(spi_device_handle_t spi)
//Send all the commands
while (lcd_init_cmds[cmd].databytes!=0xff) {
lcd_cmd(spi, lcd_init_cmds[cmd].cmd);
lcd_cmd(spi, lcd_init_cmds[cmd].cmd, false);
lcd_data(spi, lcd_init_cmds[cmd].data, lcd_init_cmds[cmd].databytes&0x1F);
if (lcd_init_cmds[cmd].databytes&0x80) {
vTaskDelay(100 / portTICK_PERIOD_MS);