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Hardware Abstraction Layer (HAL)
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Hardware Abstraction Layer (HAL)
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This section provides details about the PSoC 4 implementation of the Cypress HAL.
All information within this section is platform specific and is provided for reference. Portable application code should depend only on the APIs and types which are documented in the HAL Drivers section.
The following table shows a mapping of each HAL driver to the lower level firmware driver and the corresponding hardware resource. This is intended to help understand how the HAL is implemented for PSoC 4 and what features the underlying hardware supports.
| HAL Resource | PDL Driver(s) | PSoC 4 Hardware |
|---|---|---|
| ADC | cy_adc | SAR ADC |
| Clock | cy_sysclk | All clocks (system & peripheral) |
| Comparator | cy_ctb or cy_lpcomp | CTBm or LPComp |
| CRC | cy_crypto_core_crc | Crypto |
| DMA | cy_dma, cy_dmac | DMA Controller |
| EZI2C | cy_scb_ezi2c | SCB |
| Flash | cy_flash | Flash |
| GPIO | cy_gpio | GPIO |
| Hardware Manager | NA | NA |
| I2C | cy_scb_i2c | SCB |
| I2S | cy_i2s | I2S |
| LPTimer | cy_mcwdt | MCWDT |
| Opamp | cy_ctb | CTBm |
| PWM | cy_pwm | TCPWM |
| SPI | cy_scb_spi | SCB |
| SysPM | cy_syspm | System Power Resources |
| System | cy_syslib | System Resources |
| Timer | cy_tcpwm_counter | TCPWM |
| TRNG | cy_crypto_core_trng | Crypto |
| UART | cy_scb_uart | SCB |
| WDT | cy_wdt | WDT |
Error codes generated by the low level level PDL driver all use module IDs starting with CY_RSLT_MODULE_DRIVERS_PDL_BASE. The exact errors are documented for each driver in the psoc4pdl documentation.
API Reference | |
| Clocks | |
| Implementation specific interface for using the Clock driver. | |
| PSoC 4 Specific Hardware Types | |
| Aliases for types which are part of the public HAL interface but whose representations need to vary per HAL implementation. | |
| Pins | |
| Definitions for the pinout for each supported device. | |
| System Power Management | |
| The PSoC 6 Power Management has the following characteristics: CYHAL_SYSPM_SYSTEM_NORMAL equates to the Low Power mode CYHAL_SYSPM_SYSTEM_LOW equates to the Ultra Low Power mode. | |
| Triggers | |
| Trigger connections for supported device families. | |
| DMA (Direct Memory Access) | |
| PWM (Pulse Width Modulator) | |
| WDT (Watchdog Timer) | |
| The PSoC 6 WDT is only capable of supporting certain timeout ranges below its maximum timeout of 6000ms. | |